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Yasufumi Iryu

Section

Advanced Institute for Marine Ecosystem Change

Job title

Professor

Degree

理学博士（東北大学）

researchmap

https://researchmap.jp/24296028

J-GLOBAL ID

201201065666848568

Research History 8

2024/04 - Present

Advanced Institute for Marine Ecosystem Change (WPI-AIMEC), Tohoku University　Marine Environment Integrative Analysis Unit　Professor
2012/04 - 2024/03

Graduate School of Science, Tohoku University　Professor
2008/04 - 2012/03

Graduate School of Environmental Studies, Nagoya University　Professor
2007/04 - 2008/03

Graduate School of Science, Tohoku University　Research Associate
1999/02 - 2007/03

Graduate School of Science, Tohoku University　Research Associate
1995/04 - 1999/01

Graduate School of Science, Tohoku University　助手
1993/08 - 1995/03

Faculty of Science, Tohoku University　助手
1991/04 - 1993/03

Fellowships of the Japan Society for the Promotion of Science for Japanese Junior Scientists　特別研究員

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Education 2

Tohoku University　Graduate School, Division of Natural Science　地学専攻

- 1987/03
Tohoku University　Faculty of Science　地学科地学第一(地質学古生物学教室)

- 1981/03

Committee Memberships 45

Palaeontological Society of Japan　Associate Editor, Paleontological Research

2015/06 - Present
日本地質学会Island Arc誌編集委員　編集顧問

2012/01 - Present
Progress in Earth and Planertary Science　総編集長

2013/12 - 2020/08
The Geological Society of Japan　President

2014/05 - 2016/05
日本古生物学会 Paleontological Research誌編集委員　Co-Editor-in Chief

2011/07 - 2015/06
日本地球惑星科学連合　代議員（地球生命科学選出）

2010/05 - 2020/04
日本古生物学会　常務委員

2013/07 - 2019/06
Japanese Coral Reef Society　Topic Editor (Geology and Geography) of Galaxea, Journal of Coral Reef Studes / Journal of the Japenese Coral Reef Society

2007/09 - 2017/07
International Fossil Algae Association　President

2011/09 - 2015/09
日本地質学会　執行理事

2008/12 - 2014/04
日本地質学会　執行理事

2008/12 - 2014/04
統合国際深海掘削計画（IODP）科学評価組織（SAS）Science Implementation & Policy Committee　委員

2011/10 - 2013/06
統合国際深海掘削計画（IODP）科学評価組織（SAS）Science Implementation & Policy Committee　委員

2011/10 - 2013/06
日本古生物学会　評議員

2011/07 - 2013/06
日本古生物学会　評議員

2011/07 - 2013/06
統合国際深海掘削計画科学計画実施・政策委員会　委員

2012/04 - 2013/03
統合国際深海掘削計画科学計画実施・政策委員会　委員

2012/04 - 2013/03
Island Arc誌編集委員　Editor-in-Chief

2008/01 - 2011/12
Island Arc誌編集委員　編集委員長

2008/01 - 2011/12
統合国際深海掘削計画（IODP）科学評価組織（SAS）科学評価立案　共同議長

2010/04 - 2011/09
統合国際深海掘削計画（IODP）科学評価組織（SAS）科学評価立案　共同議長

2010/04 - 2011/09
統合国際深海掘削計画（IODP）科学評価組織（SAS）科学評価立案　パネル委員

2009/11 - 2011/09
統合国際深海掘削計画（IODP）科学評価組織（SAS）科学評価立案　パネル委員

2009/11 - 2011/09
日本地質学会　評議員

2006/04 - 2010/05
日本地質学会　評議員

2006/04 - 2010/05
高知大学海洋コア総合研究センター全国共同利用委員会委員　課題選定委員会委員委員長

2008/03 - 2010/03
高知大学海洋コア総合研究センター全国共同利用委員会委員　課題選定委員会委員委員長

2008/03 - 2010/03
日本サンゴ礁学会　評議員

2005/07 - 2009/06
日本サンゴ礁学会　評議員

2005/07 - 2009/06
日本古生物学会「化石」編集委員　編集副委員長

2007/04 - 2009/03
日本古生物学会「化石」編集委員　編集副委員長

2007/04 - 2009/03
独立行政法人石油天然ガス・金属鉱物資源機構大水深探査技術検討委員会専門部会　専門委員

2005/04 - 2009/03
独立行政法人石油天然ガス・金属鉱物資源機構大水深探査技術検討委員会専門部会　専門委員

2005/04 - 2009/03
IODP国内科学計画委員会　委員

2003/05 - 2009/03
IODP国内科学計画委員会　委員

2003/05 - 2009/03
日本古生物学会「化石」編集委員　編集委員

2005/04 - 2007/03
日本古生物学会「化石」編集委員　編集委員

2005/04 - 2007/03
第17回国際堆積学会議（ISC2006）組織委員　広報委員

2003/04 - 2007/03
第17回国際堆積学会議（ISC2006）組織委員　広報委員

2003/04 - 2007/03
日本地質学会　評議員

2003/09 - 2005/03
日本地質学会　評議員

2003/09 - 2005/03
日本地球掘削科学コンソーシアムIODP部会　執行部員

2003/04 - 2005/03
日本地球掘削科学コンソーシアムIODP部会　執行部員

2003/04 - 2005/03
日本堆積学研究会　行事委員

2002/04 - 2005/03
日本堆積学研究会　行事委員

2002/04 - 2005/03

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Professional Memberships 14

日本地球化学会
日本生態学会
日本第四紀学会
日本堆積学研究会
日本サンゴ礁学会
アメリカ堆積学会(SEPM)
American Geophysical Union
Phycological Society of America
日本藻類学会
日本古生物学会
日本地質学会
International Association of Sedimentologists
International Phycological Society
International Society for Reef Studies

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Research Interests 6

climatic change
Quaternary
coralline algae
Ryukyu Islands
coral reef
carbonate

Research Areas 2

Life sciences / Ecology and environmental science / Reef Ecology
Natural sciences / Biogeoscience / Carbonate geochemistry

Awards 9

Japanese Coral Reef Society Award

2019/11　Japanese Coral Reef Society
The Geological Society of Japan Prize

2013/09/14　日本地質学会
優秀講演賞

2018/11　地球環境史学会　現生腕足動物殻の微量金属元素濃度の変動とその要因
陸水性続成作用が珪長質砕屑岩より産する腕足動物化石に与える影響の定量的評価

2018/06　日本古生物学会　日本古生物学会優秀ポスター賞
日本地質学会優秀ポスター賞

2016/09/12　日本地質学会　腕足動物化石の炭素・酸素同位体組成と殻の微細構造は続成作用の進行によってどのように変化するか
日本古生物学会優秀ポスター賞

2015/01/31　日本古生物学会　石垣島の現生サンゴ骨格から復元された過去約500年間の海洋環境変動
日本地質学会第121年大会（鹿児島）優秀講演賞

2014/09　日本地質学会
日本地質学会第114年大会（札幌）優秀講演賞

2007/09　日本地質学会
日本地質学会第112年大会（千葉）優秀講演賞

2005/09　日本地質学会

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Papers 265

The Grand Challenges of WPI-AIMEC: Executive Summary

Toshio Suga, Fumio Inagaki, Kentaro Ando, Michio Kondoh, S. Smith, Keith Rodgers, Toyonobu Fujii, Michio Kawamiya, Hanani Adiwira, Maki Aita, Vani Alviani, Cheryl Ames, Kamrum Azad, Ettore Barbieri, Batdulam Battulga, Jonathan Derot, Diego Deville, Tetsuichi Fujiki, Jimena García-Rodríguez, Tomoko Hamabata, Masumi Hasegawa-Takano, Andrew Hirzel, Tatsuhiko Hoshino, Benjamin Horton, Shigeki Hosoda, Minoru Ikeda, Yasufumi Iryu, Yoichi Ishikawa, Kota Ishikawa, Sabine Kasten, Jamie Kass, Satoshi Katayama, Shinya Kouketsu, Gaku Kumano, Zhen Lin, Jutarak Luang‑on, Hiroshi Murakami, Yuriko Nagano, Takashi Nakagawara, Tomoe Nasuno, Goh Nishitani, Riko Oki, Takeshi Obayashi, Yuichi Okayama, Yusaku Ohta, Shuhei Ono, Yutaka Osada, Bo Qiu, Namal Rathnayake, Kelvin Richards, Niklas Schneider, Takashi Sakamaki, Yusuke Sasaki, Kanako Sato, Masahito Shigemitsu, Eko Siswanto, Kugako Sugimoto, Shusaku Sugimoto, Yoshihisa Suyama, Kaoru Tachiiri, Hiromi Takahata, Hideko Takayanagi, Akifumi Tanabe, Hiroaki Tatebe, Fumiaki Tomita, Tsunaki Iida, Gerlien Verhaegen, Clara Vives, Lael Wakamatsu, Shingo Watanabe, Shuya Wang, Angelicque White, Nadine Wood, Baolan Wu, Shang-Ping Xie, Sayaka Yasunaka, Jiwei Yang, Akinori Yabuki, Yosuke Yamada, Alan Yee, Taichi Yokokawa, Nan Yuan, William McDonough, Kimio Hanawa

2025/08/21
Publisher: California Digital Library (CDL)
DOI： 10.31223/x55r0j 　

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The ocean has a heat capacity 1,000 times greater than that of the atmosphere and stores 50 times more carbon comparatively, thus, constituting a major sink of anthropogenically released greenhouse gases. Warming effects of human activities on the climate system are now undeniably shown to impact marine life and ecosystems, both directly via warming of the ocean and/or indirectly altering ocean circulation across spatiotemporal scales. Beyond the effect of warming on individual organisms, a changing climate signal has been argued from modeling studies to cause a ripple effect known as trophic level amplification, resulting in changes in the balance of biomass in different size classes. Larger fractional changes in biomass are expected of predator organisms at higher trophic levels, such as fish, due to shifts in the representative phytoplankton at the base of the food web. With a shift towards smaller phytoplankton, trophic amplification scenarios are expected to disrupt fisheries and carbon storage algorithms and negatively affect ecosystem services necessary for a sustainable society. Despite continued advances in monitoring and modeling of ecosystems projecting changes related to trophic coupling, suitable habitat and biogeochemical element cycling remains difficult due to inadequate information on marine ecosystems across spatiotemporal scales. WPI-Advanced Institute for Marine Ecosystem Change (WPI-AIMEC) operates based on five institutional Grand Challenges (GCs). These GCs aim to promote fusion science by integrating observational, analytical, and modeling tools to complement theoretical approaches and advance our understanding of the processes driving marine ecosystem change. By combining the research skills and knowledge of the host institutes Tohoku University and Japan Agency for Marine-Earth Science and Technology (JAMSTEC) in partnership with University ofHawai'i, we seek transformative solutions to the grandest challenges of addressing marine ecosystem change through diverse perspectives encompassing marine physics, biology, ecology, biogeochemistry, and data science. Overall, the AIMEC Grand Challenges offer unprecedented opportunities for crossdisciplinary fusion science and scientific breakthroughs with the attainable goal of "Planetary Stewardship”—the responsible management and care of the natural systems to ensure a sustainable and healthy planet for future generations.
Penultimate glacial sea surface temperature and hydrologic variability in the tropical South Pacific from 150 ka Tahiti corals Peer-reviewed

Ryuji Asami, Thomas Felis, Ryuichi Shinjo, Masafumi Murayama, Yasufumi Iryu

2025/07/01
Publisher: Copernicus GmbH
DOI： 10.5194/egusphere-2025-2996 　

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Abstract. Constraining climate models under extreme boundary conditions of the past on societally-relevant timescales is complicated by a common lack of high-resolution reconstructions of sea surface environmental variability for glacial periods. Here, we present subseasonally-resolved Sr/Ca and oxygen isotope (δ18O) records from well-preserved and precisely-dated fossil corals of the penultimate glacial and last glacial periods drilled by Integrated Ocean Drilling Program Expedition 310 "Tahiti Sea Level" in the central tropical South Pacific. The proxy records document the mean and seasonality of sea surface temperature (SST) and seawater δ18O (δ18Osw) at 153 ka and 148 ka, during Marine Isotope Stage (MIS) 6b, and around 30 ka during MIS 3a. Results show mean SST 2.8–4.0 °C lower than present for MIS 6b, and about 3.8 °C lower for MIS 3a. The MIS 6b SST differences are greater during the austral winter (3.7–4.4 °C lower) than during the austral summer (2.0–3.7 °C lower), indicating a greater SST seasonality relative to today during the penultimate glacial. A reconstructed higher mean δ18Osw for both MIS 6b and MIS 3a (+0.41‰ to +0.51‰ relative to today) suggest more saline surface waters in the central tropical South Pacific over the entire year. Our coral-based reconstructions of SST and hydrology may indicate a reduced mixed layer depth around Tahiti during the penultimate glacial and last glacial. A potential explanation is a westward-expanded South Pacific subtropical dry area relative to today, probably accompanied by lower activity and/or displacement of the South Pacific Convergence Zone.
Origin of interstitial water beneath the continental shelf offshore northwestern Australia: insights from hydrogen and oxygen isotope compositions International-journal International-coauthorship Peer-reviewed

Kosuke Yoshii, Hideko Takayanagi, Toshihiro Miyajima, Lars Reuning, Kazuyuki Yamamoto, Yasufumi Iryu

Progress in Earth and Planetary Science　12　(1)　2025/06/23
Publisher: Springer Science and Business Media LLC
DOI： 10.1186/s40645-025-00722-6 　

eISSN： 2197-4284

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Abstract We analyzed the hydrogen and oxygen isotope compositions of interstitial water collected from Miocene–Quaternary carbonate platforms beneath the continental shelf margin off northwestern Australia during the International Ocean Discovery Program Expedition 356. By integrating isotope data with onboard salinity and chemical concentration measurements, we investigated the behavior of interstitial water in this continental shelf system. The interstitial water was classified into three groups based on salinity. Group 1 (salinity = 34−40) consisted of upper low-salinity water infiltrating from the modern seafloor, transitioning downward into highly saline water. This high-salinity water likely formed in situ during glacial periods. Group 3, characterized by extremely high salinity (salinity = 101−153), likely originated from the Late Miocene seawater modified by evaporation in an arid coastal environment. Group 2 (salinity = 43−98) represented a mixture of Groups 1 and 3. This study offers valuable insights into the hydrology of modern and ancient carbonate platforms, with implications for similar systems worldwide.
Effects of artificial diagenetic alteration on the microstructure, isotopic composition, and metal element concentrations in brachiopod shells International-journal Peer-reviewed

Hiroshi Fujioka, Katsuhiko Suzuki, Hideko Takayanagi, Eiji Tasumi, Koshi Yamamoto, Hiroaki Ohfuji, Toshihiro Miyajima, Yasufumi Iryu

GEOCHEMICAL JOURNAL　53　(3)　96-117　2025/04/29
Publisher: Geochemical Society of Japan
DOI： 10.2343/geochemj.gj25005 　

ISSN： 0016-7002

eISSN： 1880-5973

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In this study, we investigated the effect of burial diagenesis on the microstructure and isotopic (δ13C and δ18O) and chemical compositions of modern brachiopod (Terebratulina crossei) shells through controlled artificial diagenesis experiments. The shells were placed in sediment and artificial seawater mixtures and subjected to experimental conditions of 125°C and 75 MPa for 720 h. Statistically significant changes were observed in the isotopic and chemical compositions of the shells before and after the artificial experiments. Notable findings include decreases in δ18O values under all four experimental conditions; increases in Mn concentration in the carbonate powder-artificial seawater mixture, quartz powder-artificial seawater mixture, and artificial seawater; and decreases in the δ13C values in the carbonate powder-artificial seawater mixture and sandstone powder-artificial seawater mixture. The observed δ18O variations were predominantly influenced by temperature rather than by the isotopic and chemical compositions of the ambient sediments and fluids. The Mn concentration increased when the shells were placed in materials relatively poor in Mn (i.e., carbonate, quartz, and artificial seawater). This suggests that Mn originated from organic matter within the shells. The decrease in δ13C values is likely attributable to the thermal degradation of organic matter in the shells. Scanning electron microscopy (SEM) revealed minimal evidence of shell microstructure degradation and destruction due to the experiments. However, transmission electron microscopy (TEM) revealed traces of dissolution that were not discernible using conventional SEM. These findings underscore the importance of nanoscale analysis in future investigations of brachiopod shell-based paleoenvironmental reconstructions.
Public symposium “Biogenic Reefs: Past and Future” Peer-reviewed

Yasufumi IRYU, Natsuko ADACHI, Kazuyuki YAMAMOTO, Kazuhiko FUJITA, Ryuji ASAMI, Hiroya YAMANO, Hideko TAKAYANAGI

Journal of the Japanese Coral Reef Society　26　(1)　59-80　2025/01
Publisher: Japanese Coral Reef Society
DOI： 10.3755/jcrs.26.59 　
Coralline red algal species diversity at a shallow rhodolith bed in warm-temperate Japan, including two new species of Roseolithon (Hapalidiales, Corallinophycidae) International-journal Peer-reviewed

Min-Khant-Kyaw, Aki Kato, Kenta Adachi, Yasufumi Iryu, Masasuke Baba

Phycologia　63　(6)　520-533　2024/11/25
Publisher: Informa UK Limited
DOI： 10.1080/00318884.2024.2421269 　

ISSN： 0031-8884

eISSN： 2330-2968
Recent efforts to improve the accuracy and precision of carbonate clumped-isotope analysis International-journal Peer-reviewed

Kazuma Oikawa, Osamu Abe, Yasufumi Iryu

Island Arc　33　(1)　e12537　2024/10/15
Publisher: Wiley
DOI： 10.1111/iar.12537 　
Assessing the relative activity of faulting along both flanks of the Ou Backbone Range, Tohoku Region, Japan, from fluvial geomorphic analyses International-journal International-coauthorship Peer-reviewed

J. Bruce H. Shyu, Jhih-Hao Liao, Chia-Yu Chen, Hiroyuki Tsutsumi, Yasufumi Iryu

Progress in Earth and Planetary Science　11　(1)　2024/07/10
Publisher: Springer Science and Business Media LLC
DOI： 10.1186/s40645-024-00644-9 　

eISSN： 2197-4284

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Abstract The Ou Backbone Range in the Tohoku Region of Japan is bounded on its both sides by two major active fault systems: the Western Fault Zone of Kitakami Lowland in the east and the Eastern Fault Zone of Yokote Basin in the west. Although these two systems are primary active fault systems in the region, information on their long-term activity characteristics is still quite limited. Therefore, we analyzed the normalized channel steepness indexes of river valleys trending perpendicular to the range front along both flanks of the Ou Backbone Range. Our results show that the eastern flank has gentler river valleys, whereas rivers along the northwestern flank are steeper. Our field investigation shows that knickpoints in this area are mostly related to local lithologic boundaries or are check dams along the valleys, thus the river systems are likely under steady-state conditions. Hence, the steeper river valleys in northwestern Ou Backbone Range indicate a higher uplift rate of the area. Because both fault systems are primarily dip-slip reverse faults and do not have significant variations in their subsurface geometry, the faster uplift suggests that the northern segment of the Eastern Fault Zone of Yokote Basin has a higher slip rate. This is consistent with results of previous studies, and the fact that the rupture of the 1896 Rikuu earthquake, the only historical surface-rupturing event in this region, was only limited along the northern segment of this fault system.
Biogeographical patterns of the porcelaneous larger foraminifer Alveolinella quoyi through the integration of fossil data International-coauthorship Peer-reviewed

Davide Bassi, Yasufumi Iryu, Johannes Pignatti, Kazuhiko Fujita, Willem Renema

Geobios　85　1-9　2024/07
Publisher: Elsevier BV
DOI： 10.1016/j.geobios.2024.05.002 　

ISSN： 0016-6995
Paleoenvironmental significance of growth story of long-living deep-water acervulinid macroids from Kikai-jima shelf, Central Ryukyu Islands, Japan International-journal International-coauthorship Peer-reviewed

Davide Bassi, Juan Carlos Braga, Ryuji Asami, Kazuhisa Goto, Sönke Szidat, Hideko Takayanagi, Yasufumi Iryu

Palaeogeography, Palaeoclimatology, Palaeoecology　112254-112254　2024/05
Publisher: Elsevier BV
DOI： 10.1016/j.palaeo.2024.112254 　

ISSN： 0031-0182
Shallow-water temperature seasonality in the middle Cretaceous mid-latitude northwestern Pacific International-journal Peer-reviewed

Shunta Ichimura, Hideko Takayanagi, Yasufumi Iryu, Satoshi Takahashi, Tatsuo Oji

Frontiers in Marine Science　11　(1324436.)　2024/04/02
Publisher: Frontiers Media SA
DOI： 10.3389/fmars.2024.1324436 　

eISSN： 2296-7745

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Temperature seasonality during the middle Cretaceous provides vital information about climate dynamics and ecological traits of organisms under the conditions of the “supergreenhouse” Earth. However, sub-annual scale paleotemperature records in the mid-latitude region remain limited. In this study, sclerochronological and stable oxygen isotope (δ¹⁸O) analyses of bivalve fossils from the northwestern Pacific (paleolatitude: 44°N) were used to estimate their life history and sub-annual scale temperature patterns of the middle Cretaceous. The materials studied included Cucullaea (Idonearca) delicatostriata and Aphrodina pseudoplana recovered from middle Turonian (middle Cretaceous) shallow marine deposits in Hokkaido, northern Japan. Growth increment width and shell δ¹⁸O of C. (I.) delicatostriata revealed that the growth rate was temporally maximized and then minimized, which can be interpreted as representing spring and winter growth, respectively. Approximately 25 fortnightly growth increments occurred within that cycle, suggesting that shell formation proceeded continuously throughout the year. Based on shell δ¹⁸O values, shallow-water temperatures from 28°C to 35°C with 7°C seasonality were estimated, under the assumption that seawater δ¹⁸O values were annually invariant at −1‰ relative to VSMOW. This temperature seasonality in the middle Cretaceous is more than 5°C smaller than the seasonality of modern shallow-water environments at the same latitudes. These findings, taken together with previous studies of other oceanic regions, suggest that the Northern Hemisphere had low seasonal shallow-water temperature variation of up to 10°C in the middle Cretaceous.
Porcelaneous larger foraminiferal responses to Oligocene–Miocene global changes International-journal International-coauthorship Peer-reviewed

Davide Bassi, Juan Carlos Braga, Johannes Pignatti, Kazuhiko Fujita, James H. Nebelsick, Willem Renema, Yasufumi Iryu

Palaeogeography, Palaeoclimatology, Palaeoecology　634　111916-111916　2024/01
Publisher: Elsevier BV
DOI： 10.1016/j.palaeo.2023.111916 　

ISSN： 0031-0182
Hydrogen and oxygen isotope compositions of bottom waters collected around off southwestern Tokara Islands Peer-reviewed

Kazuma OIKAWA, Toshihiro MIYAJIMA, Hideko TAKAYANAGI, Yasufumi IRYU

Bulletin of the Geological Survey of Japan　74　(5-6)　329-336　2023/12/28
Publisher: Geological Survey of Japan, National Institute of Advanced Industrial Science
DOI： 10.9795/bullgsj.74.5-6_329 　

ISSN： 1346-4272

eISSN： 2186-490X
Multidecadal-to-interannual modulations of Late Holocene climate variations reconstructed from oxygen isotope ratios of a 237-year-long lived fossil coral in Kikai Island, southwestern Japan International-journal Peer-reviewed

Ko-Yuan Chuang, Ryuji Asami, Hideko Takayanagi, Maki Morimoto, Osamu Abe, Toru Nakamori, Yasufumi Iryu

Quaternary Science Reviews　322　(108392)　2023/11/11
Publisher: Elsevier
DOI： 10.1016/j.quascirev.2023.108392 　
Topography, sedimentology, and biochronology of carbonate deposits on seamounts in the JA area, northwestern Pacific Ocean Peer-reviewed

Yasufumi Iryu, Hikari Hino, Hideko Takayanagi, Tokiyuki Sato, Akiko Suzuki, Yuho Fujimaki, Akira Usui

Island Arc　IAR12501　2023/10
Publisher: Wiley
DOI： 10.1111/IAR.12501 　
A new species of the larger porcelaneous foraminifer Borelis provides novel insights into Neogene to recent western Pacific palaeobiogeographical dispersal patterns International-coauthorship Peer-reviewed

Davide Bassi, Yasufumi Iryu, Shunichi Kinoshita, Kazuhiko Fujita, Johannes Pignatti

Palaeogeography, Palaeoclimatology, Palaeoecology　2023/08/19
Publisher: Elsevier
DOI： 10.1016/j.palaeo.2023.111764 　
Formation of methane-derived dolomite concretions in Okinawa-Jima, Southwest Japan during the Early Pleistocene “Chinen Disturbance” Peer-reviewed

Ryo Matsumoto, Rika Takeuchi, Hiroshi Nakagawa, Tokiyuki Sato, Yasufumi Iryu, Hiroki Matsuda, Junko Komatsubara, Michio Sato

The Journal of the Geological Society of Japan　129　(1)　415-434　2023/08/09
Publisher: The Geological Society of Japan
DOI： 10.5575/geosoc.2023.0008 　

ISSN： 0016-7630

eISSN： 1349-9963
Geological history of the land area between Okinawa Jima and Miyako Jima of the Ryukyu Islands, Japan, and its phylogeographical significance for the terrestrial organisms of these and adjacent islands International-journal Invited Peer-reviewed

Nana Watanabe, Kohsaku Arai, Makoto Otsubo, Mamoru Toda, Atsushi Tominaga, Shun Chiyonobu, Tokiyuki Sato, Tadahiro Ikeda, Akio Takahashi, Hidetoshi Ota, Yasufumi Iryu

Progress in Earth and Planetary Science　10　(1)　2023/07/20
Publisher: Springer Science and Business Media LLC
DOI： 10.1186/s40645-023-00567-x 　

eISSN： 2197-4284

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Abstract The modern and Late Pleistocene terrestrial fauna of Miyako Jima and adjacent islands (the Miyako Islands) in the southern Ryukyu Islands, southwestern Japan, includes some endemic taxa or genetically unique populations that exclusively have closest allies in the more isolated Okinawa Jima and adjacent islands (the Okinawa Islands) than in the Yaeyama Islands, which are located southwest of the Miyako Islands with much narrower intervening straits. Those taxa or populations include representatives of lineages that have physiologically highly limited ability for over-sea dispersal and the Miyako Islands are currently separated from the Okinawa Islands by at least 300 km of open water; therefore, the formation of this phylogeographical pattern is perplexing. In this study, we review the late Cenozoic geology of the Miyako Islands, southern Okinawa Jima, the Okinawa–Miyako submarine plateau (OMSP; a plateau located between Okinawa Jima and Miyako Jima), and the Kerama gap, which is a depression between the OMSP and Okinawa Jima. We then consider the origin of the modern and Late Pleistocene terrestrial animals, including a number of non-volant vertebrates on the Miyako Islands. Finally, we propose a new hypothesis (the OMSP hypothesis) to explain the enigmatic composition of modern and Late Pleistocene terrestrial vertebrate fauna of the islands. Southern Okinawa Jima was uplifted and emerged after ca. 2 Ma and was temporarily connected to the OMSP, which is likely to have emerged earlier than southern Okinawa Jima, to form a large island extending from Okinawa Jima to the Miyako Islands with a NE–SW direction of ~ 400 km. Subsequently, Okinawa Jima became separated from the OMSP when the Ryukyu Group—which is composed of Quaternary reef and associated fore-reef and shelf deposits—began to accumulate around the island at 1.7–1.4 Ma. During the interval from 2.0 to 1.7–1.4 Ma, numerous terrestrial animals, including flightless vertebrates, extended their distribution to the OMSP. Although the Miyako Islands repeatedly underwent complete submergence during deposition of the main part of the Ryukyu Group (1.25–0.4 Ma), they were uplifted and emerged to become a land area after ca. 0.4 Ma. In contrast, the OMSP subsided after ca. 0.4 Ma and was almost completely submerged after 0.27 Ma. During ca. 0.4–0.27 Ma, terrestrial animals migrated from the OMSP to the Miyako Islands.
Progressive carbonation and Ca-metasomatism of serpentinized ultramafic rocks: insights from natural occurrences and hydrothermal experiments International-journal Peer-reviewed

Nomuulin Amarbayar, Otgonbayar Dandar, Jiajie Wang, Atsushi Okamoto, Masaoki Uno, Undarmaa Batsaikhan, Hideko Takayanagi, Yasufumi Iryu, Noriyoshi Tsuchiya

Contributions to Mineralogy and Petrology　178　2023/06
Publisher: SpringerNature
DOI： 10.1007/s00410-023-02013-z 　

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Hydration, carbonation, and related metasomatism of mantle peridotite play a significant role in the global geochemical cycle. In this study, we combined an analysis of carbonated serpentinite with hydrothermal experiments on carbonation and Ca-metasomatism for samples from the Manlay ophiolite, southern Mongolia to investigate that carbonation mechanism of the serpentinite body after serpentinization. Samples show that the serpentinite was either transected by calcite and dolomite veins or was completely replaced by carbonates (calcite with minor dolomite) and quartz, in which the original mesh texture of serpentinite was preserved. Carbonation occurred after low-temperature serpentinization (lizardite/chrysotile), suggesting that carbonation occurred at temperatures lower than 300 ˚C. Calcite in the serpentinite showed δ13 CVPDB values ranging from -8.83 to -5.11 ‰ and δ18 OVSMOW from + 20.1 to + 24.4 ‰, suggesting that CO2 in the fluids could be derived from the degradation of organic material or methanotrophic processes rather than the origin of seafloor limestone. Three batch-type experiments, i.e., single step experiments (1) Olivine + NaHCO3,aq + CaCl2,aq and (2) Chrysotile + NaHCO3,aq + wollastonite (Ca source), and two steps experiment (3) Olivine carbonation and Ca-metasomatism, were conducted at 275 °C and 5.7 MPa to constrain the mechanism of calcite replacement of serpentinite. We found that calcite precipitated from the solution directly in the first two experiments, but replacement of serpentinite by calcite was not observed. In contrast, the third experiment caused the initial carbonation to form magnesite and then changed to calcite by later alteration. The natural occurrences and experiments revealed the possibility that the carbonation of olivine followed by Ca-rich fluid infiltration produced calcite in the carbonated serpentinite. Such Ca-metasomatism of Mg carbonates could easily occur in the ultramafic bodies and significantly affect the global carbon cycle.
Are the coral mounds of the Kushimoto area, Wakayama Prefecture, Japan, submerged Holocene reefs? Peer-reviewed

Chuki Hongo, Ryuji Asami, Yasufumi Iryu

Galaxea, Journal of Coral Reef Studies　26　1-7　2023/03/30

DOI： 10.3755/galaxea.G26-1 　
Uplift rate of Kitadaito Jima Island on the lithospheric forebulge of the Philippine Sea Plate International-journal International-coauthorship Peer-reviewed

Yasufumi Iryu, Hideko Takayanagi, Tsuyoshi Ishikawa, Akimasa Ishigaki, Takuji Asanuma, Rin Teruya, David A. Budd

Progress in Earth and Planetary Science　10　(1)　2023/01/18
Publisher: Springer Science and Business Media LLC
DOI： 10.1186/s40645-023-00535-5 　

eISSN： 2197-4284

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Abstract Estimates of uplift rates for lithospheric forebulges are needed to understand exact plate motions at plate convergence zones and to delineate the fate of coral reefs atop the forebulges. A carbonate island on a lithospheric forebulge can provide excellent materials for estimating uplift rate because carbonate sediments can be dated and their paleo-water depth determined. We estimated the uplift rate of Kitadaito Jima Island, a carbonate island on the lithospheric forebulge of the Philippine Sea Plate that is subducting beneath the Eurasian Plate. Marine skeletal sands containing pebble-sized bioclasts and filling the concavity of an intertidal erosional notch at an elevation of ~ 71 m were found near the top of this island. Strontium isotope ages ranging from 1.78 to 2.01 Ma with an average of 1.89 Ma (standard deviation = 0.07 Ma) were obtained from these deposits. As global sea level at 1.89 Ma was ~ 21 m lower than the present, the mean uplift rate was estimated at ~ 49 m/million years (Myr) with a compounded uncertainty of ± 2.6 m/Myr. This rate is comparable to, or up to ~ 140 m/Myr less than, rates reported from other Indo-Pacific carbonate islands in similar tectonic settings. This study illustrates how contemporary Sr isotope age models and careful considerations of limestone sample depositional depths can yield more accurate and precise uplift rates of modern forearc bulges than possible in many older studies.
Reef growth history at intermediate to mesophotic depths since the end of the Last Glacial period along the Great Barrier Reef shelf edge International-journal International-coauthorship Peer-reviewed

Marc Humblet, Jody M. Webster, Yusuke Yokoyama, Juan Carlos Braga, Kazuhiko Fujita, Yasufumi Iryu, Stewart J. Fallon, William G. Thompson

Coral Reefs and Sea-Level Change: Quaternary Records and Modelling (Eds G.F. Camoin and N. Hallmann)　189-214　2022/12
Publisher: International Association of Sedimentologists
DOI： 10.54780/iassp49/07 　

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Reef communities at intermediate (10 to 30 m) and mesophotic (~ 30 to 150 m) depths occupy large areas of sea floor but little is known about their potential to accrete vertically, their response to sea-level change and other environmental perturbations. In this study, the authors have examined cores from two holes, M0040A and M0041A, drilled by the International Ocean Drilling Program Expedition 325 along the shelf edge of the modern GBR at 131 m water depth. The objective was to investigate reef growth history at palaeo-water depths > 20 m over a time period spanning 30,000 years, from the end of the Last Glacial period through the last deglaciation. Based on changes in lithologies and biotic components, and a robust chronostratigraphic framework supported by 47 radiometric ages, the authors have identified two episodes of reef growth, one during Marine Isotope Stage (MIS) 2 and the other at the onset of the deglaciation, both characterised by abundant microbialite crusts and distinct coral assemblages. Palaeo-water depths range from 30 to 60 m and from 20 to 30 m for the MIS 2 and early deglacial reef sections, respectively. The first episode of reef growth documented in the cores initiated at 27 to 25 ka, possibly in response to increased light availability and change in sedimentation resulting from falling sea-level between 32 and 29 ka from MIS 3 and also to low atmospheric pCO2 at the end of the Last Glacial period. Reef accretion was reduced or ceased sometime between 24 and 19 ka, coinciding with the rapid 20 m sea-level fall of the peak Last Glacial Maximum and minima of SSTs. Reef growth resumed at 19.5 to 18.5 ka, influenced by a period of moderate sea-level rise and increasing sea surface temperatures at the onset of the deglaciation. Reef growth termination at ca. 17 ka correlates with a major episode of reef demise previously identified in adjacent mid and outer terrace cores and linked to reduced water quality combined with rapid deglacial sea-level rise. Vertical accretion (VA) rates were calculated based on two methods: linear visual fitting and Bayesian modelling. The findings show that the highest VA rates are associated with microbialite boundstone. Reef ecosystems dominated by microbialite and corals developed at intermediate and mesophotic depths, and grew vertically at maximum rates of 2 to 5 mm yr-1 depending on the method used, over a period of rapid environmental change during the transition from MIS 3 to MIS 1. Further study needs to explore the potential of modern-type deep coralgal communities to cope with higher rates of sea-level rise predicted this century.
Editorial for the thematic issue, "Orogens, Ophiolites, and Oceans: A Snapshot of Earth's Tectonic Evolution" International-journal International-coauthorship Peer-reviewed

Iryu, Y., Tsujimori, T., Hrano, N., Ichiyama, Y.

Island Arc　31　(1)　e12468　2022/11
Publisher: Wiley
DOI： 10.1111/iar.12468 　

ISSN： 1038-4871

eISSN： 1440-1738
The pteropod species Heliconoides inflatus as an archive of late Pleistocene to Holocene environmental conditions on the Northwest Shelf of Australia International-journal International-coauthorship Peer-reviewed

Maximilian Hallenberger, Lars Reuning, Hideko Takayanagi, Yasufumi Iryu, Nina Keul, Takeshige Ishiwa, Yusuke Yokoyama

Progress in Earth and Planetary Science　9　2022/10/01

DOI： 10.1186/s40645-022-00507-1 　
Calcareous nannofossil biostratigraphy of the upper Cenozoic in the Okinawa-Miyako Submarine Plateau in the Ryukyu Islands Peer-reviewed

Tokiyuki Sato, Nana Watanabe, Kazuyuki Yamamoto, Yasufumi Iryu

The Journal of the Geological Society of Japan　128　(1)　185-190　2022/09/22
Publisher: The Geological Society of Japan
DOI： 10.5575/geosoc.2022.0018 　

ISSN： 0016-7630

eISSN： 1349-9963
Characterization of water masses around the southern Ryukyu Islands based on isotopic compositions Peer-reviewed

Andros Daniel Cruz Salmeron, Hideko Takayanagi, Shigeyuki Wakaki, Tsuyoshi Ishikawa, Toshihiro Miyajima, Hitomi Wakaki, Takuya Itaki, Yasufumi Iryu

Progress in Earth and Planetary Science　9　(1)　2022/08/17
Publisher: Springer Science and Business Media LLC
DOI： 10.1186/s40645-022-00503-5 　

eISSN： 2197-4284

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Abstract We investigated the water-mass structure on the Okinawa Trough and Pacific sides of the southern Ryukyu Island Arc (Yonaguni, Iriomote, and Ishigaki subareas) using the Nd isotope composition (¹⁴³Nd/¹⁴⁴Nd ratios; expressed as εNd values) of benthic foraminiferal tests in surface sediments, which reflect bottom-water composition, along with hydrogen and oxygen isotope compositions (δD and δ¹⁸O values, respectively) and physical properties (temperature and salinity) of seawater. The Okinawa Trough side has lower εNd values than the Pacific side due to continental/island material inputs characterized by relatively low εNd values. Moreover, within the Okinawa Trough, other processes control the Nd behavior of seawater and primarily affect the Yonaguni and Iriomote subareas, as follows. (1) Surface and subsurface waters are influenced by Taiwanese river discharge combined with temporospatial variations in oceanographic conditions including Kuroshio Current meandering. (2) Intermediate water is characterized by low εNd values (down to − 8.2), possibly attributable to sediment plumes and turbiditic fluxes. (3) The εNd values of bottom water indicate upwelling and vertical mixing, with composition therefore being similar to those of intermediate water. The εNd profiles are better defined on the Pacific side. High εNd values occur in surface and subsurface (< 300 m depth, potential density < 25.0 kg m⁻³) waters, and low values (down to − 7.0) occur in subsurface–core-intermediate water (400–600 m depth, 26–27 kg m⁻³). εNd values increase slightly to − 4.0 below 750 m depth and remain constant down to about 2000 m depth, below which deep water shows a slight decrease in εNd values. Intermediate and bottom/deep waters are distinguished from upper layers by their lower δD and δ¹⁸O values.
Sr isotope variations in Oligocene–Miocene and modern biogenic carbonate formations of Koko Guyot (Emperor Seamount Chain, Pacific Ocean) International-journal International-coauthorship Peer-reviewed

Irina A.Vishnevskaya, Marc Humblet, Yasufumi Iryu, Davide Bassi, Tatiana G. Okuneva, Dari V. Kiseleva, Andrey V. Vishnevskiy, Natalia G. Soloshenko, Pavel E. Mikhailik

Marine Geology　451　(106879)　2022/08

DOI： 10.1016/j.margeo.2022.106879 　
Ephemeral Masks in the Ellipsoidal Foraminifera Alveolinella and Borelis (Alveolinoidea): Resilient Solutions to Stabilization in Coral-Reef Settings International-journal International-coauthorship Peer-reviewed

Davide Bassi, Johannes Pignatti, Sigal Abramovich, Kazuhiko Fujita, Johann Hohenegger, Jere H. Lipps, Yasufumi Iryu

52　(2)　92-98　2022/04

DOI： 10.2113/gsjfr.52.2.92 　
Larger porcelaneous foraminifera with a common ancestor: The Neogene Indo-Pacific Flosculinella and Alveolinella (Alveolinoidea) International-journal International-coauthorship Peer-reviewed

Davide Bassi, Monica Bolivar-Feriche, Willem Renema, Juan C. Braga, Johannes Pignatti, Giovanni Di Domenico, Kazuhiko Fujita, Jere H. Lipps, Jesús Reolid, Yasufumi Iryu

Marine Micropaleontology　102124-102124　2022/04
Publisher: Elsevier BV
DOI： 10.1016/j.marmicro.2022.102124 　

ISSN： 0377-8398
Contrasting intensity of aragonite dissolution and dolomite cementation in glacial versus interglacial intervals of a subtropical carbonate succession International-journal International-coauthorship Peer-reviewed

Lars Reuning, Hanaa Deik, Benjamin Petrick, Gerald Auer, Hideko Takayanagi, Yasufumi Iryu, Margot Courtillat, Maria‐Angela Bassetti

Sedimentology　2022/02/17
Publisher: Wiley
DOI： 10.1111/sed.12985 　

ISSN： 0037-0746

eISSN： 1365-3091
Last glacial temperature reconstructions using coupled isotopic analyses of fossil snails and stalagmites from archaeological caves in Okinawa, Japan International-journal Peer-reviewed

Ryuji Asami, Rikuto Hondo, Ryu Uemura, Masaki Fujita, Shinji Yamasaki, Chuan-Chou Shen, Chung-Che Wu, Xiuyang Jiang, Hideko Takayanagi, Ryuichi Shinjo, Akihiro Kano, Yasufumi Iryu

Scientific Reports　11　(1)　2021/12
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41598-021-01484-z 　

eISSN： 2045-2322

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Abstract We applied a new geoarchaeological method with two carbonate archives, which are fossil snails from Sakitari Cave and stalagmites from Gyokusen Cave, on Okinawa Island, Japan, to reconstruct surface air temperature changes over the northwestern Pacific since the last glacial period. Oxygen isotope ratios (δ¹⁸O) of modern and fossil freshwater snail shells were determined to infer seasonal temperature variations. The observational and analytical data confirm that δ¹⁸O values of fluid inclusion waters in the stalagmite can be regarded as those of spring waters at the sites where snails lived. Our results indicate that the annual mean, summer, and winter air temperatures were lower by 6–7 °C at ca. 23 thousand years ago (ka) and 4–5 °C at ca. 16–13 ka than those of the present day. Our reconstruction implies that surface air cooling was possibly two times greater than that of seawater around the Ryukyu Islands during the Last Glacial Maximum, which potentially enhanced the development of the East Asian summer monsoon during the last deglaciation. Considering the potential uncertainties in the temperature estimations, the climatic interpretations of this study are not necessarily definitive due to the limited number of samples. Nevertheless, our new geoarchaeological approach using coupled δ¹⁸O determinations of fossil snails and stalagmite fluid inclusion waters will be useful for reconstructing snapshots of seasonally resolved time series of air temperatures during the Quaternary.
Biostratigraphic and palaeobiogeographic patterns of the larger porcelaneous foraminifer Austrotrillina Parr, 1942 Peer-reviewed

Davide Bassi, Md. Aftabuzzaman, Monica Bolivar-Feriche, Juan Carlos Braga, Julio Aguirre, Willem Renema, Hideko Takayanagi, Yasufumi Iryu

Marine Micropaleontology　169　102058-102058　2021/10
Publisher: Elsevier BV
DOI： 10.1016/j.marmicro.2021.102058 　

ISSN： 0377-8398
Multi‐approach characterization of shallow‐water carbonates off Minamitorishima and their depositional settings/history Peer-reviewed

Md Aftabuzzaman, Kazuki Yomogida, Shota Suzuki, Hideko Takayanagi, Akimasa Ishigaki, Shiki Machida, Yoshihiro Asahara, Koshi Yamamoto, Naoto Hirano, Shin‐Ichi Sano, Shun Chiyonobu, Davide Bassi, Yasufumi Iryu

Island Arc　30　(1)　2021/04
Publisher: Wiley
DOI： 10.1111/iar.12400 　

ISSN： 1038-4871

eISSN： 1440-1738
Carbon and Oxygen Isotope Records of Tridacna squamosa Shells from two Different Latitudes in the Ryukyu Islands Peer-reviewed

Satoshi Kodama, Hideko Takayanagi, Kosuke Yoshii, Thuy Thi Nhu Ha, Ryuji Asami, Osamu Abe, Yasufumi Iryu

Paleontological Research　25　(2)　2021/04/01
Publisher: The Paleontological Society of Japan
DOI： 10.2517/2020pr003 　

ISSN： 1342-8144
Palaeobiogeography and evolutionary patterns of the larger foraminifer Borelis de Montfort (Borelidae) Peer-reviewed

Davide Bassi, Juan C. Braga, Giovanni Di Domenico, Johannes Pignatti, Sigal Abramovich, Pamela Hallock, Janine Könen, Zoltan Kovács, Martin R. Langer, Giulio Pavia, Yasufumi Iryu

Papers in Palaeontology　7　(1)　377-403　2021/02
Publisher: Wiley
DOI： 10.1002/spp2.1273 　

ISSN： 2056-2799

eISSN： 2056-2802
Species composition and mitochondrial molecular phylogeny of Acropora corals in Funakoshi, Amami-Oshima Island, Japan: A proposal for its new taxonomic grouping Peer-reviewed

Hironobu Fukami, Aoi Niimura, Toru Nakamori, Yasufumi Iryu

Galaxea, Journal of Coral Reef Studies　23　(1)　17-35　2021
Publisher: Japanese Coral Reef Society
DOI： 10.3755/galaxea.g23-5 　

ISSN： 1883-0838

eISSN： 1883-3969
High‐resolution upper Pliocene to Pleistocene calcareous nannofossil biostratigraphy in Ocean Drilling Program Hole 1146A in the South China Sea Peer-reviewed

Sara Emanuel, Tokiyuki Sato, Shun Chiyonobu, J. Bruce H. Shyu, Davide Bassi, Yasufumi Iryu

Island Arc　30　(1)　2021/01
Publisher: Wiley
DOI： 10.1111/iar.12411 　

ISSN： 1038-4871

eISSN： 1440-1738
Spathian to Aegean (upper Lower Triassic to lower Middle Triassic) carbon isotope stratigraphy constrained by the conodont biostratigraphy of carbonates on top of a mid‐oceanic seamount formed in the Panthalassic Ocean Peer-reviewed

Thuy Thi Nhu Ha, Takumi Maekawa, Hideko Takayanagi, Yasufumi Iryu

Island Arc　30　(1)　2021/01
Publisher: Wiley
DOI： 10.1111/iar.12391 　

ISSN： 1038-4871

eISSN： 1440-1738
The δ13C–δ18O variations in marble in the Hida Belt, Japan Peer-reviewed

Hironobu Harada, Tatsuki Tsujimori, Keitaro Kunugiza, Katsuyuki Yamashita, Shogo Aoki, Kazumasa Aoki, Hideko Takayanagi, Yasufumi Iryu

Island Arc　30　(1)　2021/01
Publisher: Wiley
DOI： 10.1111/iar.12389 　

ISSN： 1038-4871

eISSN： 1440-1738
Summary of my research on coral reefs Have good luck and bad luck alternated like the strands of a rope? Invited Peer-reviewed

Yasufumi Iryu

Journal of the Japanese Coral Reef Society　22　2020/12
Reconstruction of Miocene to Pleistocene sea-surface conditions in the eastern Indian Ocean on the basis of calcareous nannofossil assemblages from ODP Hole 757B Peer-reviewed

Ryo Imai, Tokiyuki Sato, Shun Chiyonobu, Yasufumi Iryu

26　2020/11

DOI： 10.1111/iar.12373 　
Tectonic implications of carbonate deposits on the eastern slope of the Hahajima Seamount in the collision zone between the Izu–Bonin Arc on the Philippine Sea Plate and the Ogasawara Plateau on the Pacific Plate International-journal Peer-reviewed

Jun Miyata, Hideko Takayanagi, Akimasa Ishigaki, Naoto Hirano, Satoshi Shiokawa, Akira, Nishimura, Tsutomu Nakazawa, Tsuyoshi Ishikawa, Kazuya Nagaishi, Hidekazu Tokuyama, Akira Ishiatari, Yasufumi Iryu

Island Arc　29　(1)　e12368　2020/10/28
Publisher: Wiley
DOI： 10.1111/IAR.12368 　

ISSN： 1038-4871

eISSN： 1440-1738
The modification of microstructure and geochemical composition of fossil brachiopod shells by meteoric diagenesis

Fujioka, H, Takayanagi, H, Yamamoto, K, Iryu, Y

Chikyu Monthly　42　(10)　537-557　2020/10/01
Millennial paleotsunami history at Minna Island, southern Ryukyu Islands, Japan Peer-reviewed

Ryosuke Fujita, Kazuhisa Goto, Yasufumi Iryu, Tomoya Abe

Progress in Earth and Planetary Science　7　(1)　2020/09/23
Publisher: Springer Science and Business Media LLC
DOI： 10.1186/s40645-020-00365-9 　

eISSN： 2197-4284
Visualization of the morphology and mode of occurrence of Cenomanian rudists within a drillcore by X-ray CT scanning and 3D modeling Peer-reviewed

Motoyoshi Yamanaka, Shin-ichi Sano, Hamad Bu Alrougha Al Zaabi, Hiroshi Fujioka, Yasufumi Iryu

Progress in Earth and Planetary Science　7　(1)　2020/09/14
Publisher: Springer Science and Business Media LLC
DOI： 10.1186/s40645-020-00359-7 　

eISSN： 2197-4284

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<title>Abstract</title> Rudists are a group of bizarrely shaped marine bivalves that lived in the Tethys Ocean from the Late Jurassic to the latest Cretaceous. They are morphologically variable, including snail-like, cup-like, and horn-like shapes. In the Middle East, Cretaceous carbonates with rudists and rudist fragments are well exposed in many outcrops as well as oil and gas fields. For rudist-bearing carbonates in the subsurface, knowledge of rudist morphology and mode of occurrence must be derived from observation of drillcores; however, understanding the three-dimensional (3D) geometry of rudists from observation of core surfaces is difficult. In paleontological studies of rudists, X-ray computerized tomography (CT) scans have been carried out to reconstruct the inside texture of rudist shells for the purpose of taxonomic research. In contrast, in the oil and gas industry, application of X-ray CT scanning technology is generally focused on direct measurement of reservoir properties. Studies of rudist fossils within drillcores by means of X-ray CT have not yet been conducted. We have developed a new protocol to observe core interiors using X-ray CT. We obtained high-resolution 3D images of rudists in a drillcore by means of surface rendering, volume rendering, and 3D printing. X-ray CT and 3D modeling is a novel method for non-destructive analyses of the morphology and mode of occurrence of fossils within drillcores.
Boring bivalve traces in modern reef and deeper-water macroid and rhodolith beds Peer-reviewed

Davide Bassi, Juan C. Braga, Masato Owada, Julio Aguirre, Jere H. Lipps, Hideko Takayanagi, Yasufumi Iryu

Progress in Earth and Planetary Science　7　(1)　2020/08/26
Publisher: Springer Science and Business Media LLC
DOI： 10.1186/s40645-020-00356-w 　

eISSN： 2197-4284

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<title>Abstract</title>Macroids and rhodoliths, made by encrusting acervulinid foraminifera and coralline algae, are widely recognized as bioengineers providing relatively stable microhabitats and increasing biodiversity for other species. Macroid and rhodolith beds occur in different depositional settings at various localities and bathymetries worldwide. Six case studies of macroid/rhodolith beds from 0 to 117 m water depth in the Pacific Ocean (northern Central Ryukyu Islands, French Polynesia), eastern Australia (Fraser Island, One Tree Reef, Lizard Island), and the Mediterranean Sea (southeastern Spain) show that nodules in the beds are perforated by small-sized boring bivalve traces (<italic>Gastrochaenolites</italic>). On average, boring bivalve shells (gastrochaenids and mytilids) are more slender and smaller than those living inside shallow-water rocky substrates. In the Pacific, <italic>Gastrochaena cuneiformis</italic>, <italic>Gastrochaena</italic> sp., <italic>Leiosolenus malaccanus</italic>, <italic>L. mucronatus</italic>, <italic>L</italic>. spp., and <italic>Lithophaga</italic>/<italic>Leiosolenus</italic> sp., for the first time identified below 20 m water depth, occur as juvenile forms along with rare small-sized adults. In deep-water macroids and rhodoliths the boring bivalves are larger than the shallower counterparts in which growth of juveniles is probably restrained by higher overturn rates of host nodules. In general, most boring bivalves are juveniles that grew faster than the acervulinid foraminiferal and coralline red algal hosts and rarely reached the adult stage. As a consequence of phenotypic plasticity, small-sized adults with slow growth rates coexist with juveniles. Below wave base macroids and rhodoliths had the highest amounts of bioerosion, mainly produced by sponges and polychaete worms. These modern observations provide bases for paleobiological inferences in fossil occurrences.
Holocene sea-surface temperatures and related coastal upwelling regime recorded by vermetid assemblages, southeastern Brazil (Arraial do Cabo, RJ) Peer-reviewed

Camila Areias, Paula Spotorno-Oliveira, Davide Bassi, Yasufumi Iryu, Merinda Nash, João Wagner de Alencar Castro, Frederico Tapajós de Souza Tâmega

Marine Geology　425　106183-106183　2020/07
Publisher: Elsevier BV
DOI： 10.1016/j.margeo.2020.106183 　

ISSN： 0025-3227
Deuterium and oxygen isotope composition of bottom-seawater samples collected around Yaeyama Islands

Takayanagi, H., Miyajima, T.:, Fujioka, H., Nishio, T., Iryu, Y.

Marine Geological and Geophysical Studies around Okinawa Islands – around of Ishikaki, Iriomote and Yonaguni Islands–; Preliminary Reports on Researches in Fiscal Year 2019　94-102　2020/02
Reefal microbial crusts found in Middle Holocene reef from Okinawa Island, the Ryukyu Archipelago Peer-reviewed

Kazuhiko FUJITA, Toru SASAKI, Sho KOYANO, Masaaki CHINEN, Chuki HONGO, Jody M. WEBSTER, Yasufumi IRYU

Galaxea, Journal of Coral Reef Studies　22　(1)　9-25　2020
Publisher: Japanese Coral Reef Society
DOI： 10.3755/galaxea.22.1_9 　

ISSN： 1883-0838

eISSN： 1883-3969
Toward high-resolution reconstruction of dolomite crystal phases

Limestone　423　54-67　2020/01
Litho-, bio-, and chemostratigraphy of the Middle Triassic carbonate succession in the North-Central Coast Region of Vietnam Peer-reviewed

Thuy Thi Nhu Ha, Hideko Takayanagi, Katsumi Ueno, Yoshihiro Asahara, Koshi Yamamoto, Yasufumi Iryu

Progress in Earth and Planetary Science　6　(1)　2019/12

DOI： 10.1186/s40645-019-0293-y 　

ISSN： 2197-4284

eISSN： 2197-4284
Glacial Indonesian Throughflow weakening across the Mid-Pleistocene Climatic Transition Peer-reviewed

Petrick, B, Martínez-García, A, Auer, G, Reuning, L, Auderset, A, Deik, H, Takayanagi, H, Vleeschouwer, D. D, Iryu, Y, Haug, G. H

Scientific Reports　9　(16995)　2019/11

DOI： 10.1038/s41598-019-53382-0 　
Preliminary Test of the EA-AGE3 System for 14C Measurement of CaCO3 Samples and Coral-Based Estimation of Marine Reservoir Correction in the Ogasawara Islands, Northwestern Subtropical Pacific Invited Peer-reviewed

Yoko Saito-Kokubu, Takehiro Mitsuguchi, Takahiro Watanabe, Tsutomu Yamada, Ryuji Asami, Yasufumi Iryu

Radiocarbon　61　(5)　1593-1601　2019/10
Publisher: Cambridge University Press (CUP)
DOI： 10.1017/rdc.2019.69 　

ISSN： 0033-8222

eISSN： 1945-5755

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<title>ABSTRACT</title>We conducted a preliminary test of the coupled system of an elemental analyzer and the automated graphitization equipment Ionplus AGE3 (EA-AGE3 method) for accelerator mass spectrometry radiocarbon (AMS ¹⁴C) measurements of CaCO₃ samples, by comparing with the conventional method where the samples are hydrolyzed in phosphoric acid and resulting CO₂ gas is manually graphitized in a vacuum line (HPA method). The samples used in the test were the IAEA C2 travertine, fossil and modern corals from the Ryukyu Islands and the Ogasawara Islands, respectively (both are located in the northwestern subtropical Pacific). Results indicate that, relative to the HPA method, the EA-AGE3 method tends to cause an increase of ~0.4–0.5 pMC with more widely scattered data. This is presumably due to ¹⁴C contamination in the EA (the most likely cause seems to be a memory effect of ¹⁴C); this effect could be reduced by careful optimization of conditions and procedures in the EA process. The ¹⁴C data of pre-bomb annual bands (1931–1949 AD) in the modern Ogasawara coral obtained by the HPA method were used to estimate the marine reservoir ¹⁴C-age correction (ΔR) of this region; it ranges from –109 yr to –28 yr with the mean value with standard deviation of –81 ± 29 yr.
Foraminiferal biochronology of the Triassic Hoang Mai Formation, Central Vietnam. Peer-reviewed

Ueno, K., Ha, T. T. N, Iryu, Y

Journal of Foraminiferal Research　49　(3)　339-354　2019/07

DOI： 10.2113/gsjfr.49.3.339 　
The effects of meteoric diagenesis on the geochemical composition and microstructure of Pliocene fossil Terebratalia coreanica and Laqueus rubellus brachiopod shells from northeastern Japan Peer-reviewed

Fujioka, H, Takayanagi, H, Yamamoto, K, Iryu, Y

Progress in earth and Planetary Science　6:45　2019/06

DOI： 10.1186/s40645-019-0289-7 　
Early Carboniferous (early Visean) brachiopod fauna from the middle part of the Arisu Formation in the Shimoarisu area, South Kitakami Belt, Japan Peer-reviewed

Tazawa, J, Iryu, Y

Paleontological Research　23　(2)　95-109　2019/04

DOI： 10.2517/2018PR012 　
Deep-water macroid beds of the Ryukyu Islands, Japan: Encrusting acervulinids as ecosystem engineers. Peer-reviewed

Bassi, D, Iryu, Y, Humblet, M, Matsuda, H, Machiyama, H, Sasaki, K, Matsuda, S, Arai, K, Inoue, T

Journal of Coastal Research　35　(2)　463-466　2019/03

DOI： 10.2112/JCOASTRES-D-18-00049.1 　

ISSN： 0749-0208

eISSN： 1551-5036
Late glacial to deglacial variation of coralgal assemblages in the Great Barrier Reef, Australia Peer-reviewed

Humblet, M, Potts, D.C, Webster, J.M, Braga, J.C, Iryu, Y, Yokoyama, Y, Bourillot, R, Seard, C, Droxler, A, Fujita, K, Gischler, E, Kan, H

Global and Planetary Chnage　174　70-91　2019/03

DOI： 10.1016/j.gloplacha.2018.12.014 　
Understanding seasonality and evapotranspiration of soil water under tree and grass cover using natural isotopes Peer-reviewed

Podobed, D, Komori, D, Yoshimura, K, Tanoue, M, Takayanagi, H, Iryu, Y, Hirano, S, Otsuki, Y

Agricultural Meteorology in Tohoku　63　19-21　2019/03
Rapid glaciation and a two-step sea level plunge into the Last Glacial Maximum. International-journal Peer-reviewed

Yokoyama, Y, Esat, T. M, Thompson, W. G, Thomas, A. L, Webster, J. M, Miyairi, Y, Sawada, C, Aze, T, Matsuzaki, H, Okuno, J, Fallon, S, Braga, J.-C, Humblet, M, Iryu, Y, Potts, D. C, Fujita, K, Suzuki, A, Kan, H

Nature　559　(7715)　603-607　2018/07

DOI： 10.1038/s41586-018-0335-4 　

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The approximately 10,000-year-long Last Glacial Maximum, before the termination of the last ice age, was the coldest period in Earth's recent climate history1. Relative to the Holocene epoch, atmospheric carbon dioxide was about 100 parts per million lower and tropical sea surface temperatures were about 3 to 5 degrees Celsius lower2,3. The Last Glacial Maximum began when global mean sea level (GMSL) abruptly dropped by about 40 metres around 31,000 years ago4 and was followed by about 10,000 years of rapid deglaciation into the Holocene1. The masses of the melting polar ice sheets and the change in ocean volume, and hence in GMSL, are primary constraints for climate models constructed to describe the transition between the Last Glacial Maximum and the Holocene, and future changes; but the rate, timing and magnitude of this transition remain uncertain. Here we show that sea level at the shelf edge of the Great Barrier Reef dropped by around 20 metres between 21,900 and 20,500 years ago, to -118 metres relative to the modern level. Our findings are based on recovered and radiometrically dated fossil corals and coralline algae assemblages, and represent relative sea level at the Great Barrier Reef, rather than GMSL. Subsequently, relative sea level rose at a rate of about 3.5 millimetres per year for around 4,000 years. The rise is consistent with the warming previously observed at 19,000 years ago1,5, but we now show that it occurred just after the 20-metre drop in relative sea level and the related increase in global ice volumes. The detailed structure of our record is robust because the Great Barrier Reef is remote from former ice sheets and tectonic activity. Relative sea level can be influenced by Earth's response to regional changes in ice and water loadings and may differ greatly from GMSL. Consequently, we used glacio-isostatic models to derive GMSL, and find that the Last Glacial Maximum culminated 20,500 years ago in a GMSL low of about -125 to -130 metres.
Response of the Great Barrier Reef to sea-level and environmental changes over the past 30,000 years Peer-reviewed

Jody M. Webster, Juan Carlos Braga, Marc Humblet, Donald C. Potts, Yasufumi Iryu, Yusuke Yokoyama, Kazuhiko Fujita, Raphael Bourillot, Tezer M. Esat, Stewart Fallon, William G. Thompson, Alexander L. Thomas, Hironobu Kan, Helen V. McGregor, Gustavo Hinestrosa, Stephen P. Obrochta, Bryan C. Lougheed

Nature Geoscience　11　(6)　426-432　2018/06/01
Publisher: Nature Publishing Group
DOI： 10.1038/s41561-018-0127-3 　

ISSN： 1752-0908 1752-0894
Penetrative trace fossils from the late ediacaran of mongolia: Early onset of the agronomic revolution Peer-reviewed

Tatsuo Oji, Stephen Q. Dornbos, Keigo Yada, Hitoshi Hasegawa, Sersmaa Gonchigdorj, Takafumi Mochizuki, Hideko Takayanagi, Yasufumi Iryu

Royal Society Open Science　5　(2)　2018/02/01
Publisher: Royal Society Publishing
DOI： 10.1098/rsos.172250 　

ISSN： 2054-5703
Topics on carbonate relevant topics by IODP. Peer-reviewed

Kawahata, H, Yokoyama, Y, Kuroda, J, Iryu, Y, Kano, A

Journal of the Geological Society of Japan　124　(1)　35-45　2018/01

DOI： 10.5575/geosoc.2017.0081 　
Geochemical, petrographical, and petrophysical evaluations of a heterogeneous, stratiform dolomite from a Barremian oil field, offshore Abu Dhabi (United Arab Emirates) Peer-reviewed

Kazuyuki Yamamoto, Gary Ottinger, Osama Al Zinati, Hideko Takayanagi, Koshi Yamamoto, Yasufumi Iryu

AAPG BULLETIN　102　(1)　129-152　2018/01

DOI： 10.1306/0327171524717016 　

ISSN： 0149-1423

eISSN： 1558-9153
Nonlinear relationship between preservation of microstructure and geochemical composition of Pleistocene brachiopod shells from the Ryukyu Islands, southwestern Japan Peer-reviewed

Kazuyuki Yamamoto, Mamoru Takizawa, Hideko Takayanagi, Ryuji Asami, Yasufumi Iryu

ISLAND ARC　26　(6)　2017/11

DOI： 10.1111/iar.12217 　

ISSN： 1038-4871

eISSN： 1440-1738
Radiocarbon dating of coastal boulders from Kouzushima and Miyake islands off Tokyo Metropolitan Area, Japan: Implications for coastal hazard risk Peer-reviewed

Akihisa Kitamura, Takafumi Imai, Yosuke Miyairi, Yusuke Yokoyama, Yasufumi Iryu

QUATERNARY INTERNATIONAL　456　28-38　2017/10

DOI： 10.1016/j.quaint.2017.05.040 　

ISSN： 1040-6182

eISSN： 1873-4553
Paleoceanographic conditions at approximately 20 and 70 ka recorded in Kikaithyris hanzawai (Brachiopoda) shells Peer-reviewed

Mamoru Takizawa, Hideko Takayanagi, Koshi Yamamoto, Osamu Abe, Keiichi Sasaki, Yasufumi Iryu

GEOCHIMICA ET COSMOCHIMICA ACTA　215　189-213　2017/10

DOI： 10.1016/j.gca.2017.08.002 　

ISSN： 0016-7037

eISSN： 1872-9533
Recent progress in study on calcareous algae and algal sediments Peer-reviewed

Yasufumi Iryu, Davide Bassi

ISLAND ARC　26　(3)　e12213　2017/05

DOI： 10.1111/iar.12213 　

ISSN： 1038-4871

eISSN： 1440-1738
Recent Dasycladales (Chlorophyta) in Okinawa Jima in the Central Ryukyus, southwestern Japan: Paleontological implications Peer-reviewed

Hideo Ohba, Shinya Matsuda, Ryuji Asami, Yasufumi Iryu

ISLAND ARC　26　(3)　e12185　2017/05

DOI： 10.1111/iar.12185 　

ISSN： 1038-4871

eISSN： 1440-1738
Upper Albian-upper Turonian calcareous nannofossil biostratigraphy and chemostratigraphy in the Vocontian Basin, southeastern France Peer-reviewed

Babu Ram Gyawali, Hiroshi Nishi, Reishi Takashima, Jens O. Herrle, Hideko Takayanagi, Jean-Louis Latil, Yasufumi Iryu

NEWSLETTERS ON STRATIGRAPHY　50　(2)　111-139　2017/04

DOI： 10.1127/nos/2016/0339 　

ISSN： 0078-0421
Calcareous nannofossil assemblages of the upper Miocene to Pliocene Shimajiri Group on Okinawa-jima, Ryukyu Islands, southwestern Japan Peer-reviewed

Ryo Imai, Tokiyuki Sato, Yasufumi Iryu

JOURNAL OF ASIAN EARTH SCIENCES　135　16-24　2017/03

DOI： 10.1016/j.jseaes.2016.12.011 　

ISSN： 1367-9120

eISSN： 1878-5786
Bivalve borings in Lower Jurassic Lithiotis fauna from northeastern Italy and its palaeoecological interpretation Peer-reviewed

Davide Bassi, Renato Posenato, James H. Nebelsick, Masato Owada, Enrica Domenicali, Yasufumi Iryu

HISTORICAL BIOLOGY　29　(7)　937-946　2017

DOI： 10.1080/08912963.2016.1265956 　

ISSN： 0891-2963

eISSN： 1029-2381
Effects of Holocene sea level changes on subtidal palaeoecosystems, southeastern Brazil Peer-reviewed

Paula Spotorno-Oliveira, Frederico Tapajos de Souza Tamega, Camila Areias de Oliveira, Joao Wagner Alencar Castro, Ricardo Coutinho, Yasufumi Iryu, Davide Bassi

MARINE GEOLOGY　381　17-28　2016/11

DOI： 10.1016/j.margeo.2016.08.007 　

ISSN： 0025-3227

eISSN： 1872-6151
A Causal Link Between Paleoenvironmental Dynamics and Borehole Instability in a Cenomanian Carbonate Reservoir, Offshore Abu Dhabi. Peer-reviewed

Yamamoto, K, Obara, H, Tsusaka, K, Tsuji, Y, Al-Farhan, Z. A, Aljneibi, M. M, Takayanagi, H, Kurita, H, Sato, T, Iryu, Y

Abu Dhabi International Petroleum Exhibition & Conference. Society of Petroleum Engineers　2016/11

DOI： 10.2118/183194-MS. 　
Westrn Pacific. Invited Peer-reviewed

Kato, A, Baba, M, Matsuda, S, Iryu, Y

Riosmena-Rodríguez, R., Nelson, W. and Aguirre, J. (eds.) Rhodolith/Maërl Beds: A Global Perspective. Springer International Publishing.　335-347　2016/10/21

DOI： 10.1007/978-3-319-29315-8_14 　
Bomb-produced radiocarbon in the western tropical Pacific Ocean: Guam coral reveals operation-specific signals from the Pacific Proving Grounds Peer-reviewed

Allen H. Andrews, Ryuji Asami, Yasufumi Iryu, Donald R. Kobayashi, Frank Camacho

JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS　121　(8)　6351-6366　2016/08

DOI： 10.1002/2016JC012043 　

ISSN： 2169-9275

eISSN： 2169-9291
アラビア湾南岸に分布するバレミアン階炭酸塩岩の炭素同位体層序

水島大輔, 高柳栄子, 石田圭史郎, 淺原良浩, 山本鋼志, 佐藤時幸, 井龍康文

石油技術協会誌　81　(4)　322‐323　2016/07

ISSN： 0370-9868
ドロマイトの成因論に基づく高解像度貯留層キャラクタリゼーション―アブダビ沖巨大油田の事例―

山本和幸, 山本和幸, OTTINGER Gary, AL‐ZINATI Osama, 高柳栄子, 山本鋼志, 井龍康文

石油技術協会誌　81　(4)　324　2016/07

ISSN： 0370-9868
Changes in the depth habitat of the Oligocene planktic foraminifera (Dentoglobigerina venezuelana) induced by thermocline deepening in the eastern equatorial Pacific Peer-reviewed

Hiroki Matsui, Hiroshi Nishi, Reishi Takashima, Azumi Kuroyanagi, Minoru Ikehara, Hideko Takayanagi, Yasufumi Iryu

PALEOCEANOGRAPHY　31　(6)　715-731　2016/06

DOI： 10.1002/2016PA002950 　

ISSN： 0883-8305

eISSN： 1944-9186
Carbon and Oxygen Isotope Records from Tridacna derasa Shells: Toward Establishing a Reliable Proxy for Sea Surface Environments Peer-reviewed

Junpei Yamanashi, Hideko Takayanagi, Ayaka Isaji, Ryuji Asami, Yasufumi Iryu

PLOS ONE　11　(6)　2016/06

DOI： 10.1371/journal.pone.0157659 　

ISSN： 1932-6203
How do we select pristine brachiopod shells? Invited

Mamoru Takizawa, Hideko Takayanagi, Koshi Yamamoto, Keiichi Sasaki, Yasufumi Iryu

Kaiyo Monthly　2016/05/01
Traces of paleotsunamis in the Shetland Islands Peer-reviewed

Ishizawa, T, Watanabe, M, Goto, K, Ikehara, K, Wallis, S, Iryu, Y

Journal of the Geological Society of Japan　122　(3)　I-II　2016/03/15
Publisher: The Geological Society of Japan
DOI： 10.5575/geosoc.2016.0002 　

ISSN： 0016-7630
A newly discovered submerged reef on the Miyako-Sone platform, Ryukyu Island Arc, Northwestern Pacific Peer-reviewed

Kohsaku Arai, Hiroki Matsuda, Keiichi Sasaki, Hideaki Machiyama, Takeshi Yamaguchi, Takahiko Inoue, Taichi Sato, Hideko Takayanagi, Yasufumi Iryu

MARINE GEOLOGY　373　49-54　2016/03

DOI： 10.1016/j.margeo.2016.01.007 　

ISSN： 0025-3227

eISSN： 1872-6151
Fossil Newhousia imbricata (Dictyotales, Phaeophyceae) from postglacial coral reef deposits in Tahiti Peer-reviewed

Yasufumi Iryu

PALEONTOLOGICAL RESEARCH　20　(1)　18-23　2016/01

DOI： 10.2517/2015PR018 　

ISSN： 1342-8144
A review by the chief editors of some of the most popular papers published by PEPS in 2014-2015 Invited Peer-reviewed

Yasufumi Iryu, Kiyoshi Kuramoto, Masaki Satoh, Jun Matsumoto, Shoichi Yoshioka, Hodaka Kawahata, Ryuji Tada

PROGRESS IN EARTH AND PLANETARY SCIENCE　3　2016/01

DOI： 10.1186/s40645-016-0079-4 　

ISSN： 2197-4284
1. Geological evolution of Japan: an overview. Invited Peer-reviewed

Taira, A, Ohara, Y, Wallis, S. R, Ishiwatari A, Iryu, Y

Moreno, T., Wallis, S., Kojima, T. and Gibbons, W. (eds.) The Geology of Japan. Geological Society of London. The Geological Society of London　1-24　2016
Quantitative analysis of intraspecific variations in the carbon and oxygen isotope compositions of the modern cool-temperate brachiopod Terebratulina crossei Peer-reviewed

Hideko Takayanagi, Ryuji Asami, Tsuguo Otake, Osamu Abe, Toshihiro Miyajima, Hiroyuki Kitagawa, Yasufumi Iryu

GEOCHIMICA ET COSMOCHIMICA ACTA　170　301-320　2015/12

DOI： 10.1016/j.gca.2015.08.006 　

ISSN： 0016-7037

eISSN： 1872-9533
Carbonate sedimentation in seagrass beds on Ishigaki-jima, Ryukyu Islands, southwestern Japan Peer-reviewed

Keita Fujita, Ryuji Asami, Hideko Takayanagi, Yasufumi Iryu

ISLAND ARC　24　(2)　263-279　2015/06

DOI： 10.1111/iar.12112 　

ISSN： 1038-4871

eISSN： 1440-1738
The Pliocene to recent history of the Kuroshio and Tsushima Currents: a multi-proxy approach Invited Peer-reviewed

Stephen J. Gallagher, Akihisa Kitamura, Yasufumi Iryu, Takuya Itaki, Itaru Koizumi, Peter W. Hoiles

PROGRESS IN EARTH AND PLANETARY SCIENCE　2　2015/06

DOI： 10.1186/s40645-015-0045-6 　

ISSN： 2197-4284
Evidence for eutrophication in the northwestern Pacific and eastern Indian oceans during the Miocene to Pleistocene based on the nannofossil accumulation rate, Discoaster abundance, and coccolith size distribution of Reticulofenestra Peer-reviewed

Ryo Imai, Meutia Farida, Tokiyuki Sato, Yasufumi Iryu

MARINE MICROPALEONTOLOGY　116　15-27　2015/04

DOI： 10.1016/j.marmicro.2015.01.001 　

ISSN： 0377-8398

eISSN： 1872-6186
東日本大震災に対する日本地質学会の取り組み Invited Peer-reviewed

井龍康文

ATOMOΣ（アトモス）　57　(3)　176-178　2015/03
Publisher:
ISSN： 1882-2606
Carbonate sedimentation on Pacific coral reefs Preface Peer-reviewed

Hiroya Yamano, Yasufumi Iryu

ISLAND ARC　24　(1)　1-3　2015/03

DOI： 10.1111/iar.12101 　

ISSN： 1038-4871

eISSN： 1440-1738
Pleistocene coral assemblages on Irabu-jima, South Ryukyu Islands, Japan Peer-reviewed

Marc Humblet, Yasufumi Iryu

PALEONTOLOGICAL RESEARCH　18　(4)　224-244　2014/10

DOI： 10.2517/2014PR020 　

ISSN： 1342-8144
Current topics in on-land drilling projects in Japan

Iryu, Y, Asanuma, H, Hirono, Y

Chikyu Monthly/Special　(65)　255-261　2014/05/01
Reply to the comment by Granier on "Early Aptian paleoenvironmental evolution of the Bab Basin at the southern Neo-Tethys margin: Response to global carbon-cycle perturbations across Ocean Anoxic Event 1a" Peer-reviewed

Kazuyuki Yamamoto, Masatoshi Ishibashi, Hideko Takayanagi, Yoshihiro Asahara, Tokiyuki Sato, Hiroshi Nishi, Yasufumi Iryu

GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS　15　(5)　2091-2094　2014/05

DOI： 10.1002/2014GC005390 　

ISSN： 1525-2027
Selected scientific results of the Integrated Ocean Drilling Program Expedition 310 "Tahiti Sea Level" Invited

Iryu, Y, Asami, R

Chikyu Monthly/Special　(64)　81-87　2014/04/01
Publisher:
ISSN： 0916-9733
Subsidence of the Miyako-Sone submarine carbonate platform, east of Miyako-jima Island, northwestern Pacific Ocean Peer-reviewed

Kohsaku Arai, Hideaki Machiyama, Shun Chiyonobu, Hiroki Matsuda, Keiichi Sasaki, Marc Humblet, Yasufumi Iryu

ISLAND ARC　23　(1)　1-15　2014/03

DOI： 10.1111/iar.12051 　

ISSN： 1038-4871

eISSN： 1440-1738
Differences in oxygen and carbon stable isotope ratios between hatchery and wild pink salmon fry Peer-reviewed

Yasuo Tomida, Toshiya Suzuki, Tsutomu Yamada, Ryuji Asami, Hirofumi Yaegashi, Yasufumi Iryu, Tsuguo Otake

FISHERIES SCIENCE　80　(2)　273-280　2014/03

DOI： 10.1007/s12562-014-0699-9 　

ISSN： 0919-9268

eISSN： 1444-2906
Perspectives on onland scientic drilling - where to drill and what to study

Iryu, Y, Hirono, T

月刊地球　36　(2)　55-56　2014/02/01
Proposal of scientific ICDP drilling into reefs and carbonate platforms to be performed during the next decade

Iryu, Y, Takayanagi, H

Chukyu Monthly　36　(2)　73-78　2014/02
Publisher:
ISSN： 0387-3498
Development of the Aptian carbonate platforms in the southern Arabian Gulf region; Implication for petroleum geology Peer-reviewed

Yamamoto, K, Ishibashi, M, Takayanagi, H, Iryu, Y

Journal of the Geological Society of Japan　120　(1)　2014/01/15

DOI： 10.5575/geosoc.2013.0046 　
Chronological and paleoceanographic constraints of Miocene to Pliocene 'mud sea' in the Ryukyu Islands (southwestern Japan) based on calcareous nannofossil assemblages Peer-reviewed

Ryo Imai, Tokiyuki Sato, Yasufumi Iryu

ISLAND ARC　22　(4)　522-537　2013/12

DOI： 10.1111/iar.12046 　

ISSN： 1038-4871

eISSN： 1440-1738
Carbon-isotope composition of brachiopod shells as a paleoenvironmental proxy

Takayanagi, H, Asami, R, Iryu, Y

Chikyu Monthly　35　(12)　690-696　2013/12/01
Publisher:
ISSN： 0387-3498
MIS 7 interglacial sea-surface temperature and salinity reconstructions from a southwestern subtropical Pacific coral Peer-reviewed

Ryuji Asami, Yasufumi Iryu, Kimio Hanawa, Takashi Miwa, Peter Holden, Ryuichi Shinjo, Gustav Paulay

Quaternary Research (United States)　80　(3)　575-585　2013/11

DOI： 10.1016/j.yqres.2013.09.002 　

ISSN： 0033-5894 1096-0287
Fossil semi-endophytic species of Lithophyllum (Corallinaceae, Rhodophyta) from Tahiti, including L. kenjikonishii sp. nov., and their taphonomic signatures Peer-reviewed

William J. Woelkerling, Yasufumi Iryu, Davide Bassi

Phycologia　52　(5)　387-397　2013/09

DOI： 10.2216/13-129.1 　

ISSN： 0031-8884
Ocean acidification trend in the tropical North Pacific since the mid-20th century reconstructed from a coral archive Peer-reviewed

Ryuichi Shinjo, Ryuji Asami, Kuo-Fang Huang, Chen-Feng You, Yasufumi Iryu

MARINE GEOLOGY　342　58-64　2013/08

DOI： 10.1016/j.margeo.2013.06.002 　

ISSN： 0025-3227

eISSN： 1872-6151
Intraspecific variations in carbon-isotope and oxygen-isotope compositions of a brachiopod Basiliola lucida collected off Okinawa-jima, southwestern Japan Peer-reviewed

Hideko Takayanagi, Ryuji Asami, Osamu Abe, Toshihiro Miyajima, Hiroyuki Kitagawa, Keiichi Sasaki, Yasufumi Iryu

GEOCHIMICA ET COSMOCHIMICA ACTA　115　115-136　2013/08

DOI： 10.1016/j.gca.2013.03.026 　

ISSN： 0016-7037
Sedimentary facies and biofacies of the Torinosu Limestone in the Torinosu area, Kochi Prefecture, Japan Peer-reviewed

Hiromichi Ohga, Boguslaw Kolodziej, Martin Nose, Dieter U. Schmid, Hideko Takayanagi, Yasufumi Iryu

ISLAND ARC　22　(2)　150-169　2013/06

DOI： 10.1111/iar.12009 　

ISSN： 1038-4871

eISSN： 1440-1738
1934 and 1936 Kita-daito-jima Drilling : The First and Only Deep Drilling into Coral Reefs in the Northern Philippine Sea Invited Peer-reviewed

Iryu, Y

Journal of Geography　122　(2)　iii-iv　2013/04/25
Publisher: Tokyo Geographical Society
DOI： 10.5026/jgeography.122.iii 　

ISSN： 0022-135X
An Overview: Special Issue on “Current Status of On-land Scientific Drilling in Japan and Its Prospects” Peer-reviewed

Iryu, Y, Hirono, T, Sano, O, Koide, H

Journal of Geography　122　(2)　227-229　2013/04/25
Publisher: Tokyo Geographical Society
DOI： 10.5026/jgeography.122.227 　

ISSN： 0022-135X
特集号「日本における陸上科学掘削の現状と展望」—巻頭言— Peer-reviewed

Iryu, Y, Hirono, T, Sano, O, Oide, H

Journal of Geolography　122　(2)　230-232　2013/04/25
Publisher: Tokyo Geographical Society
DOI： 10.5026/jgeography.122.230 　

ISSN： 0022-135X
Correlative relationships between carbon- and oxygen-isotope records in two cool-temperate brachiopod species off Otsuchi Bay, northeastern Japan Peer-reviewed

Kazuyuki Yamamoto, Ryuji Asami, Yasufumi Iryu

PALEONTOLOGICAL RESEARCH　17　(1)　12-26　2013/04

DOI： 10.2517/1342-8144-17.1.12 　

ISSN： 1342-8144
Early Aptian paleoenvironmental evolution of the Bab Basin at the southern Neo-Tethys margin: Response to global carbon-cycle perturbations across Ocean Anoxic Event 1a Peer-reviewed

Kazuyuki Yamamoto, Masatoshi Ishibashi, Hideko Takayanagi, Yoshihiro Asahara, Tokiyuki Sato, Hiroshi Nishi, Yasufumi Iryu

Geochemistry, Geophysics, Geosystems　14　(4)　1104-1130　2013/04/01
Publisher: Blackwell Publishing Ltd
DOI： 10.1002/ggge.20083 　

ISSN： 1525-2027
Bathymetric distribution of ichnocoenoses from recent subtropical algal nodules off Fraser Island, eastern Australia Peer-reviewed

Davide Bassi, Yasufumi Iryu, Juan C. Braga, Hideko Takayanagi, Yoshihiro Tsuji

PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY　369　58-66　2013/01

DOI： 10.1016/j.palaeo.2012.10.003 　

ISSN： 0031-0182
Recent macroids on the Kikai-jima shelf, Central Ryukyu Islands, Japan Peer-reviewed

Davide Bassi, Yasufumi Iryu, Marc Humblet, Hiroki Matsuda, Hideaki Machiyama, Keiichi Sasaki, Shinya Matsuda, Kohsaku Arai, Takahiko Inoue

SEDIMENTOLOGY　59　(7)　2024-2041　2012/12

DOI： 10.1111/j.1365-3091.2012.01333.x 　

ISSN： 0037-0746

eISSN： 1365-3091
Hydrolithon braganum sp nov (Corallinaceae, Rhodophyta), the first known exclusively fossil semi-endophytic coralline red alga Peer-reviewed

William J. Woelkerling, Davide Bassi, Yasufumi Iryu

PHYCOLOGIA　51　(6)　604-611　2012/11

DOI： 10.2216/11-119.1 　

ISSN： 0031-8884
Reef response to sea-level and environmental changes during the last deglaciation: Integrated Ocean Drilling Program Expedition 310, Tahiti Sea Level Peer-reviewed

Gilbert F. Camoin, Claire Seard, Pierre Deschamps, Jody M. Webster, Elizabeth Abbey, Juan C. Braga, Yasufumi Iryu, Nicolas Durand, Edouard Bard, Bruno Hamelin, Yusuke Yokoyama, Alexander L. Thomas, Gideon M. Henderson, Philippe Dussouillez

GEOLOGY　40　(7)　643-646　2012/07

DOI： 10.1130/G32057.1 　

ISSN： 0091-7613

eISSN： 1943-2682
Assessing subsidence rates and paleo water-depths for Tahiti reefs using U-Th chronology of altered corals Peer-reviewed

Alexander L. Thomas, Kazuhiko Fujita, Yasufumi Iryu, Edouard Bard, Guy Cabioch, Gilbert Camoin, Julia E. Cole, Pierre Deschamps, Nicolas Durand, Bruno Hamelin, Katrin Heindel, Gideon M. Henderson, Andrew J. Mason, Hiroki Matsuda, Lucie Menabreaz, Akitoshi Omori, Terry Quinn, Saburo Sakai, Tokiyuki Sato, Kaoru Sugihara, Yasunari Takahashi, Nicolas Thouveny, Alexander W. Tudhope, Jody Webster, Hildegard Westphal, Yusuke Yokoyama

MARINE GEOLOGY　295　(295-298)　86-94　2012/02

DOI： 10.1016/j.margeo.2011.12.006 　

ISSN： 0025-3227

eISSN： 1872-6151
Isotope analysis, age calculation and calcite concentration from IODP Hole 310-M0005D.

Thomas, Alexander L, Fujita, Kazuhiko, Iryu, Yasufumi, Bard, Edouard, Cabioch, Guy, Camoin, Gilbert, Cole, Julia E, Deschamps, Pierre, Durand, Nicolas, Hamelin, Bruno, Heindel, Katrin, Henderson, Gideon M, Mason, Andrew J, Matsuda, Hiroki, Menabreaz, Lucie, Omori, Akitoshi, Quinn, Terry, Sakai, Saburo, Sato, Tokiyuki, Sugihara, Kaoru, Takahashi, Yasunari, Thouveny, Nicolas, Tudhope, Alexander W, Webster, Jody M, Westphal, Hildegard, Yokoyama, Yusuke

PANGEA　2012

DOI： 10.1594/PANGAEA.787783 　
「第10回国際化石藻類シンポジウム(ルーマニアクルージュ・ナポカ)」参加報告(学術集会参加報告)

井龍康文

化石　91　52-54　2012
Publisher: 日本古生物学会
DOI： 10.14825/kaseki.91.0_52 　

ISSN： 0022-9202
Temporal changes in biotic and abiotic composition of shallow-water carbonates on submerged seamounts in the northwestern Pacific Ocean and their controlling factors Peer-reviewed

Hideko Takayanagi, Yasufumi Iryu, Motoyoshi Oda, Tokiyuki Sato, Shun Chiyonobu, Akira Nishimura, Tsutomu Nakazawa, Tsuyoshi Ishikawa, Kazuya Nagaishi

GEODIVERSITAS　34　(1)　189-217　2012

DOI： 10.5252/g2012n1a11 　

ISSN： 1280-9659

eISSN： 1638-9395
Typification and reassessment of seventeen species of coralline red algae (Corallinales and Sporolithales, Rhodophyta) described byW. Ishijima during 1954-1978 Peer-reviewed

Yasufumi Iryu, Davide Bassi, William J. Woelkerling

JOURNAL OF SYSTEMATIC PALAEONTOLOGY　10　(1)　171-209　2012

DOI： 10.1080/14772019.2010.550325 　

ISSN： 1477-2019

eISSN： 1478-0941
沖縄本島西方の島棚より採取されたサンゴモ球内にみられる現生生痕化石群集

高柳栄子, バッシダヴィデ, 井龍康文

平成23年度研究概要報告書—沖縄島西方沖海域—　58　186-191　2012
顕生代における海水の炭素・酸素同位体組成変動全解明

井龍康文, 高柳栄子

月刊地球　44　225-263　2012
浅海性炭酸塩堆積物に基づく氷期の琉球列島北部の海洋環境−氷期にサンゴ礁はあったのか？

松田博貴, 町山栄章, 荒井晃作, 井上卓彦, 佐々木圭一, 吉津憲, 三納正美, 井龍康文, 杉原薫, 藤田和彦, 山田努, 中森亨

月刊地球　34　363-372　2012
沖縄本島南部に分布する琉球層群の層序 Peer-reviewed

寒河江健一, ハンブレマーク, 小田原啓, 千代延俊, 佐藤時幸, 樺元淳一, 高柳栄子, 井龍康文

地質学雑誌　118　(118)　117-136　2012
Publisher: The Geological Society of Japan
DOI： 10.5575/geosoc.2011.0009 　

ISSN： 0016-7630

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The Pleistocene Ryukyu Group, composed of reef-complex deposits, crops out in southern Okinawa-jima, Ryukyu Islands, southwestern Japan. Here, based on new investigations, we revise the previous stratigraphic scheme for the Ryukyu Group and provide a formal stratigraphic description. In the study area, the Ryukyu Group comprises the Itoman, Naha, and Minatogawa formations. The Itoman Formation, composed mainly of coralline algal limestone, is thin (>2 m thick) and sporadically distributed. The Naha Formation rests unconformably on the Itoman Formation, reaches 50 m in thickness, and is exposed at elevations of up to ca. 170 m. The Naha Formation is divisible into four units; each unit is composed of coral limestone overlain by rhodolith, Cycloclypeus—Operculina, and detrital limestones, showing a deepening-upward sequence. The contact between the upper two units (units 3 and 4) is unconformable; this unconformity is present in other areas in Okinawa-jima, such as Yomitan, the Motobu Peninsula, and Ie-jima. Calcareous nannofossil assemblages indicate that deposition of the Naha Formation began at 1.392—1.706 Ma, and continued until after 0.853 Ma. The Itoman Formation and the lowest interval of the Naha Formation are coeval, and they represent, respectively, reef and off-reef facies of reef-complex deposits. The Minatogawa Formation rests unconformably on the Naha Formation, reaches 20 m in thickness, and consists of well-sorted detrital and coral limestones that are thought to have been deposited in a shallow lagoon (moat); its surface exposure is confined to elevations of less than 50 m. The geologic age of the Minatogawa Formation is unknown at this time.
To Be or Not to Be a Fossil Rhodolith? Analytical Methods for Studying Fossil Rhodolith Deposits Peer-reviewed

Davide Bassi, Yasufumi Iryu, James H. Nebelsick

JOURNAL OF COASTAL RESEARCH　28　(1)　288-295　2012/01

DOI： 10.2112/11T-00001.1 　

ISSN： 0749-0208
Carbon- and oxygen-isotope compositions of a modern deep-water brachiopod Campagea japonica collected off Aguni-jima, Central Ryukyu Islands, southwestern Japan Peer-reviewed

Hideko Takayanagi, Ryuji Asami, Osamu Abe, Hiroyuki Kitagawa, Toshihiro Miyajima, Yasufumi Iryu

GEOCHEMICAL JOURNAL　46　(2)　77-87　2012

DOI： 10.2343/geochemj.1.0153 　

ISSN： 0016-7002

eISSN： 1880-5973
Submerged reefal deposits near a present-day northern limit of coral reef formation in the northern Ryukyu Island Arc, northwestern Pacific Ocean Peer-reviewed

Hiroki Matsuda, Kohsaku Arai, Hideaki Machiyama, Yasufumi Iryu, Yoshihiro Tsuji

ISLAND ARC　20　(3)　411-425　2011/09

DOI： 10.1111/j.1440-1738.2011.00775.x 　

ISSN： 1038-4871
Brachiopod taxa and shell portions reliably recording past ocean environments: Toward establishing a robust paleoceanographic proxy Peer-reviewed

Kazuyuki Yamamoto, Ryuji Asami, Yasufumi Iryu

GEOPHYSICAL RESEARCH LETTERS　38　(38)　2011/07

DOI： 10.1029/2011GL047134 　

ISSN： 0094-8276
Rhodoliths from deep fore-reef to shelf areas around Okinawa-jima, Ryukyu Islands, Japan Peer-reviewed

Shinya Matsuda, Yasufumi Iryu

Marine Geology　282　(3-4)　215-230　2011/04/15

DOI： 10.1016/j.margeo.2011.02.013 　

ISSN： 0025-3227
Sources of plutonium to the tropical Northwest Pacific Ocean (1943-1999) identified using a natural coral archive Peer-reviewed

Patric Lindahl, Ryuji Asami, Yasufumi Iryu, Paul Worsfold, Miranda Keith-Roach, Min-Seok Choi

GEOCHIMICA ET COSMOCHIMICA ACTA　75　(5)　1346-1356　2011/03

DOI： 10.1016/j.gca.2010.12.012 　

ISSN： 0016-7037

eISSN： 1872-9533
Variation in deglacial coralgal assemblages and their paleoenvironmental significance: IODP Expedition 310, "Tahiti Sea Level" Peer-reviewed

Elizabeth Abbey, Jody M. Webster, Juan C. Braga, Kaoru Sugihara, Carden Wallace, Yasufumi Iryu, Donald Potts, Terry Done, Gilbert Camoin, Claire Seard

GLOBAL AND PLANETARY CHANGE　76　(1-2)　1-15　2011/03

DOI： 10.1016/j.gloplacha.2010.11.005 　

ISSN： 0921-8181

eISSN： 1872-6364
RECENT ICHNOCOENOSIS IN DEEP WATER MACROIDS, RYUKYU ISLANDS, JAPAN Peer-reviewed

D. Bassi, M. Humblet, Y. Iryu

PALAIOS　26　(3-4)　232-238　2011/03

DOI： 10.2110/palo.2010.p10-093r 　

ISSN： 0883-1351

eISSN： 1938-5323
Stable isotope compositions of a giant clam (Tridacna maxima) in Micronesia Peer-reviewed

Hwang, T. H, Woo, K. S, Park, H. S, Iryu, Y, Takayanagi, H

Journal of the Geological Society of Korea　47　(5)　561-567　2011
沖縄本島西方の粟国島沖（水深606 m）より採取された現生腕足動物殻の炭素・酸素同位体組成

高柳栄子, 浅海竜司, 井龍康文

沖縄周辺海域の海洋地質学的研究平成22年度研究概要報告書—沖縄島西方沖海域—　55　187-193　2011
IODP expedition 325: Great barrier reefs reveals past sea-level, climate and environmental changes since the last ice age

Yusuke Yokoyam, Jody M. Webster, Carol Cotterill, Juan Carlos Braga, Luigi Jovane, Heath Mills, Sally Morgan, Atsushi Suzuki, the IODP Expedition 325 Scientists

Scientific Drilling　12　(12)　32-45　2011

DOI： 10.2204/iodp.sd.12.04.2011 　

ISSN： 1816-8957 1816-3459
伊勢湾・三河湾における現生底生有孔虫群集の分布 Peer-reviewed

横井大作, 阿部理, 井龍康文

化石　89　(89)　15-26　2011
Publisher: Palaeontological Society of Japan
DOI： 10.14825/kaseki.89.0_15 　

ISSN： 0022-9202

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The distributions of modern benthic foraminiferal assemblages were investigated in Ise and Mikawa bays, Japan, using surface sediments collected in September 2007. Forty seven species belonging to 40 genera were identified from Ise and Mikawa bays. Agglutinated species were dominant in the inner part of Ise and Mikawa bays, while calcareous species were dominant in the central part of Ise Bay. Significant shifts of assemblages were found in comparison with the distribution from surface sediments collected in 1940 from Ise Bay; calcareous species were replaced with agglutinated species in the inner part and the composition of calcareous species had changed completely in the central part. These results suggest that the present bottom environments are more eutrophic and anoxic than they were 67 years ago. Indicator species also suggested that Ise Bay is presently more eutrophic and anoxic than Mikawa Bay. A comparative study of distributions in Tokyo and Osaka bays demonstrated several similarities, while regional characteristic also were found there.
沖縄島那覇港沖の海底コアから発見された知念層とその意義 Peer-reviewed

藤田和彦, 千代延俊, 溝渕年哉, 井龍康文

地質学雑誌　117　(117)　625-631　2011
Publisher: The Geological Society of Japan
DOI： 10.5575/geosoc.2011.0016 　

ISSN： 0016-7630

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The Chinen Formation, consisting mainly of calcareous sandstone and sandy limestone, is exposed in the middle-eastern and southern parts of Okinawa-jima, southwestern Japan. This formation represents a transitional lithofacies between siliciclastic deposits (the Shimajiri Group) and coral-reef carbonates (the Ryukyu Group). Here we report the occurrence of the Chinen Formation from a submarine core (about 19 m below sea level) drilled off Naha Port, west of Okinawa-jima, where the formation has not been reported previously. We examined the lithology, calcareous nannofossil biostratigraphy, and large benthic foraminiferal assemblages in seven sediment samples collected from the core interval between 28 and 36 m below sea floor, which is overlain by limestone of the Ryukyu Group. These sediments consist of unconsolidated calcareous silt and sand, consistent with the lthology of the Chinen Formation. Calcareous nannofossil assemblages indicate that the core interval corresponds to Quaternary nannofossil datum planes 11 and 10 (1.706–1.392 Ma). The benthic foraminiferal assemblage is dominated by Pseudorotalia papillosa, accompanied by Operculina spp. and Reophax spp., indicating that the sediments were deposited on a muddy sand bottom of the upper shelf slope (water depth of 100–200 m). These results indicate that calcareous sandstone and siltstone were deposited along the shelf slope at the eastern and western margins of Okinawa-jima during the deposition of the Itoman Formation (shallow-water limestone).
Sealevel history recorded in the Pleistocene carbonate sequence in IODP Hole 310-M0005D, off Tahiti Peer-reviewed

Yasufumi Iryu, Yasunari Takahashi, Kazuhiko Fujita, Gilbert Camoin, Guy Cabioch, Hiroki Matsuda, Tokiyuki Sato, Kaoru Sugihara, Jody M. Webster, Hildegard Westphal

ISLAND ARC　19　(4)　690-706　2010/12

DOI： 10.1111/j.1440-1738.2010.00737.x 　

ISSN： 1038-4871
Within-shell variations in carbon and oxygen isotope compositions of two modern brachiopods from a subtropical shelf environment off Amami-o-shima, southwestern Japan Peer-reviewed

Kazuyuki Yamamoto, Ryuji Asami, Yasufumi Iryu

GEOCHEMISTRY GEOPHYSICS GEOSYSTEMS　11　(11)　2010/10

DOI： 10.1029/2010GC003190 　

ISSN： 1525-2027
Trace element variations in fossil corals from Tahiti collected by IODP Expedition 310: Reconstruction of marine environments during the last deglaciation (15 to 9 ka) Peer-reviewed

Mayuri Inoue, Yusuke Yokoyama, Mariko Harada, Atsushi Suzuki, Hodaka Kawahata, Hiroyuki Matsuzaki, Yasufumi Iryu

MARINE GEOLOGY　271　(3-4)　303-306　2010/06

DOI： 10.1016/j.margeo.2010.02.016 　

ISSN： 0025-3227
Carbonate diagenesis of the Late Pleistocene limestone of the Faaa M0020A core: IODP Expedition 310, Tahiti Sea Level Change Peer-reviewed

Kyung Sik Woo, Kyeong Hwan Yoon, Young Joo Lee, Tsutomu Yamada, Ryuji Asami, Yasufumi Iryu

GEOSCIENCES JOURNAL　14　(2)　225-234　2010/06

DOI： 10.1007/s12303-010-0021-5 　

ISSN： 1226-4806
Sea-level rise during Termination II inferred from large benthic foraminifers: IODP Expedition 310, Tahiti Sea Level Peer-reviewed

Kazuhiko Fujita, Akitoshi Omori, Yusuke Yokoyama, Saburo Sakai, Yasufumi Iryu

MARINE GEOLOGY　271　(1-2)　149-155　2010/05

DOI： 10.1016/j.margeo.2010.01.019 　

ISSN： 0025-3227
Carbon and oxygen isotopic compositions of modern brachiopod shells from a warm-temperate shelf environment, Sagami Bay, central Japan Peer-reviewed

Kazuyuki Yamamoto, Ryuji Asami, Yasufumi Iryu

PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY　291　(3-4)　348-359　2010/05

DOI： 10.1016/j.palaeo.2010.03.006 　

ISSN： 0031-0182

eISSN： 1872-616X
Rhodolith-bearing gravelly carbonate sediments on the shelf off Kikai Island, Kagoshima Prefecture Peer-reviewed

Hiroki Matsuda, Kohsaku Arai, Takahiko Inoue, Hideaki Machiyama, Keiichi Sasaki, Yasufumi Iryu, Kazuhiko Fujita, Marc Humblet, Kaoru Sugihara, Masakazu Nara

Journal of the Sedimentological Society of Japan　69　(2)　62-62　2010
Publisher: The Sedimentological Society of Japan
DOI： 10.4096/jssj.69.62 　

ISSN： 1342-310X

eISSN： 1882-9457
沖縄本島西方海域より採取した底層水の炭素・酸素同位体組成

高柳栄子, 阿部理, 浅海竜司, 井龍康文

沖縄周辺海域の海洋地質学的研究平成21年度研究概要報告書—沖縄島西方沖海域—　51　86-92　2010
地球表層環境—古環境から未来環境へ，現状を生き抜くために—

井龍康文, 川幡穂高, 黒田潤一郎, 西弘嗣, 横山祐典, 大河内直彦

月刊地球　32　112-119　2010
北大東島の地表に分布するドロマイトのSr 同位体比年代 Peer-reviewed

高柳栄子, 中山裕樹, 石川剛志, 永石一弥, 井龍康文

地質学雑誌　116　(116)　237-240　2010
Publisher: The Geological Society of Japan
DOI： 10.5575/geosoc.116.237 　

ISSN： 0016-7630

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We present strontium (Sr) isotope data for island-surface dolomites at Kita-daito-jima, northern Philippine Sea. The ⁸⁷Sr/⁸⁶Sr ratios of 50 samples fall within a wide range from 0.709037 to 0.709079, corresponding to 4.9-2.1 Ma. This wide range in Sr ages reflects the fact that the island-surface dolomites comprise variable mixtures of geochemically distinct, diachronous, dolomite crystal phases. Our results indicate that the Sr isotope ages of multi-generational dolomites on carbonate islands such as Niue and Little Bahama Bank, as well as Kita-daito-jima, should be re-examined employing a new method that determines the Sr isotope ratio of individual crystal phases.
鹿児島県喜界島沖陸棚上の含石灰藻球礫質炭酸塩堆積物 Peer-reviewed

松田博貴, 荒井晃作, 井上卓彦, 町山栄章, 佐々木圭一, 井龍康文, 藤田和彦, Marc Humblet, 杉原薫, 奈良正和

堆積学研究　(69)　2010
Late Oligocene to Miocene reef formation on Kita-daito-jima, northern Philippine Sea. Peer-reviewed

Iryu, Y, Inagaki, S, Suzuki, Y, Yamamoto, K

Special Publications of the International Association of Sedimentologists　42　243-254　2010
Philippine Sea Plate motion since the Eocene estimated from paleomagnetism of seafloor drill cores and gravity cores Peer-reviewed

Toshitsugu Yamazaki, Masaki Takahashi, Yasufumi Iryu, Tokiyuki Sato, Motoyoshi Oda, Hideko Takayanagi, Shun Chiyonobu, Akira Nishimura, Tsutomu Nakazawa, Takashi Ooka

EARTH PLANETS AND SPACE　62　(6)　495-502　2010

DOI： 10.5047/eps.2010.04.001 　

ISSN： 1343-8832
The tropical giant clam Hippopus hippopus shell, a new archive of environmental conditions as revealed by sclerochronological and delta O-18 profiles Peer-reviewed

A. Aubert, C. E. Lazareth, G. Cabioch, H. Boucher, T. Yamada, Y. Iryu, R. Farman

CORAL REEFS　28　(4)　989-998　2009/12

DOI： 10.1007/s00338-009-0538-0 　

ISSN： 0722-4028
Palaeobiogeographic patterns of a persistent monophyletic lineage: Lithophyllum pustulatum species group (Corallinaceae, Corallinales, Rhodophyta) Peer-reviewed

Davide Bassi, Juan C. Braga, Yasufumi Iryu

PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY　284　(3-4)　237-245　2009/12

DOI： 10.1016/j.palaeo.2009.10.003 　

ISSN： 0031-0182
Evidence for tropical South Pacific climate change during the Younger Dryas and the Bolling-Allerod from geochemical records of fossil Tahiti corals Peer-reviewed

Ryuji Asami, Thomas Felis, Pierre Deschamps, Kimio Hanawa, Yasufumi Iryu, Edouard Bard, Nicolas Durand, Masafumi Murayama

EARTH AND PLANETARY SCIENCE LETTERS　288　(1-2)　96-107　2009/10

DOI： 10.1016/j.epsl.2009.09.011 　

ISSN： 0012-821X

eISSN： 1385-013X
Variations in Pleistocene coral assemblages in space and time in southern and northern Central Ryukyu Islands, Japan Peer-reviewed

M. Humblet, Y. Iryu, T. Nakamori

MARINE GEOLOGY　259　(1-4)　1-20　2009/04

DOI： 10.1016/j.margeo.2008.12.002 　

ISSN： 0025-3227

eISSN： 1872-6151
REASSESSMENT OF "BOUEINA" PACIFICA ISHIJIMA, 1978 (ORBITOLININAE, FORAMINIFERIDA), FORMERLY CONSIDERED A GREEN HALIMEDACEAN ALGA Peer-reviewed

Davide Bassi, Lukas Hottinger, Yasufumi Iryu

JOURNAL OF FORAMINIFERAL RESEARCH　39　(2)　120-125　2009/04

DOI： 10.2113/gsjfr.39.2.120 　

ISSN： 0096-1191
RE-ASSESSMENT OF THE TYPE COLLECTIONS OF FOURTEEN CORALLINALEAN SPECIES (CORALLINALES, RHODOPHYTA) DESCRIBED BY W. ISHIJIMA (1942-1960) Peer-reviewed

Yasufumi Iryu, Davide Bassi, William J. Woelkerling

PALAEONTOLOGY　52　(52)　401-427　2009/03

DOI： 10.1111/j.1475-4983.2009.00850.x 　

ISSN： 0031-0239
Limestones as a paleobathymeter for reconstructing past seismic activities: Muroto-misaki, Shikoku, southwestern Japan Peer-reviewed

Y. Iryu, H. Maemoku, T. Yamada, Y. Maeda

GLOBAL AND PLANETARY CHANGE　66　(1-2)　52-64　2009/03

DOI： 10.1016/j.gloplacha.2008.03.009 　

ISSN： 0921-8181
SEALEX - Internal reef chronology and virtual drill logs from a spreadsheet-based reef growth model Peer-reviewed

Martin Koelling, Jody Michael Webster, Gilbert Camoin, Yasufumi Iryu, Edouard Bard, Claire Seard

GLOBAL AND PLANETARY CHANGE　66　(1-2)　149-159　2009/03

DOI： 10.1016/j.gloplacha.2008.07.011 　

ISSN： 0921-8181
Present-day and fossil rhodolith pavements compared: Their potential for analysing shallow-water carbonate deposits Peer-reviewed

Davide Bassi, James H. Nebelsick, Alessio Checconi, Johann Hohenegger, Yasufumi Iryu

SEDIMENTARY GEOLOGY　214　(1-4)　74-84　2009/02

DOI： 10.1016/j.sedgeo.2008.03.010 　

ISSN： 0037-0738
Progress in micropaleontology and paleoceanography as the late Cenozoic environmental tracers

Oda Motoyoshi, Sato Tokiyuki, Yamasaki Makoto, Iryu Yasufumi, Suzuki Noritoshi

Fossils　86　5-5　2009
Publisher: Palaeontological Society of Japan
DOI： 10.14825/kaseki.86.0_5 　

ISSN： 0022-9202
Erratum : Geologic ages of the Chinen Formation on the Katsuren Peninsula, Okinawa-jima based on calcareous nannofossil biostratigraphy [The Journal of the Geological Society of Japan Vol. 115 (2009) , No. 10 p.528-539]

Chiyonobu Shun, Saruwatari Hayato, Sato Tokiyuki, Kabamoto Junichi, Iryu Yasufumi

Jour. Geol. Soc. Japan　115　(11)　621_1　2009
Publisher: The Geological Society of Japan
DOI： 10.5575/geosoc.115.621_1 　

ISSN： 0016-7630
沖縄本島東方海域より採取されたサンゴモ球（予報）

井龍康文, 高柳栄子, 河邑圭太

沖縄周辺海域の海洋地質学的研究平成20年度研究概要報告書—沖縄島東方沖海域—　46　158-163　2009
沖縄本島勝連半島に分布する知念層の石灰質ナンノ化石層序 Peer-reviewed

千代延俊, 猿渡隼人, 佐藤時幸, 樺元淳一, 井龍康文

地質学雑誌　115　(115)　528-539　2009
Publisher: The Geological Society of Japan
DOI： 10.5575/geosoc.115.528 　

ISSN： 0016-7630

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The Chinen Formation in southern Okinawa-jima, southwestern Japan, is composed mainly of calcareous sandstone and siltstone, sandy limestone, and detrital limestone that represent the transitional lithofacies between siltstones of the upper Miocene to Pliocene Shimajiri Group and detrital to reefal limestones of the Pleistocene Ryukyu Group. The calcareous nannofossil biostratigraphy of the Chinen Formation and the Ryukyu Group in two drillcores from the Katsuren Peninsula were studied. Abundant specimens of the calcareous nannofossils, Gephyrocapsa caribbeanica and G. oceanica, whose biostratigraphic bases occurred at 1.73 Ma and 1.65 Ma, were recognized in the Chinen Formation and the Ryukyu Group in the two cores. The early Calabrian datum plane, the first occurrence of large specimens of Gephyrocapsa spp. (>6μm; 1.45 Ma), is situated in the Chinen Formation. Biostratigraphic correlation of the Shimajiri and Chinen Formations and the Ryukyu Group, compiled from selected boreholes and surface outcrops, indicates that the Chinen Formation on the Katsuren Peninsula and its environs is correlated with the late Gelasian to early Calabrian between >1.73 Ma and 1.21 Ma and that the deposition of the Ryukyu Group initiated in early Calabrian time between 1.45 Ma and 1.21 Ma.
Preface International-journal International-coauthorship Peer-reviewed

Iryu, Y, Cabioch, G, Chen, D. Matsuda, H, Piller, W. E

Sedimentary Geology　214　(1-4)　1-2　2009

DOI： 10.1016/j.sedgeo.2008.10.003 　

ISSN： 0037-0738
Deep zooxanthellate corals in the Ryukyu Islands: insight from Modern and fossil reefs Peer-reviewed

M. Humblet, Y. Furushima, Y. Iryu, H. Tokuyama

27TH IAS MEETING OF SEDIMENTOLOGISTS　129-133　2009
腕足動物殻の炭素・酸素同位体比記録が意味するもの -Kikaithyris hanzawaiおよびBasiliola lucidaを例にして-

山本和幸, 浅海竜司, 井龍康文

月刊地球　59　(59)　86-94　2008
Publisher:
ISSN： 0916-9733
Rapid subsidence of the Kikai seamount inferred from drowned Pleistocene coral limestone: Implication for subduction of the Amami Plateau, Northern Philippine Sea Peer-reviewed

Tsutomu Nakazawa, Akira Nishimura, Yasufumi Iryu, Tsutomu Yamada, Hiroshi Shibasaki, Satoshi Shiokawa

MARINE GEOLOGY　247　(1-2)　35-45　2008/01

DOI： 10.1016/j.margeo.2007.08.004 　

ISSN： 0025-3227

eISSN： 1872-6151
Shallow seismic profiling survey on postglacial fore-reef near the present-day northern limit of coral reef formation in the northwestern Pacific Peer-reviewed

Arai,K, Inoue, T, Matsuda, H, Machiyama, H, Sasaki, K, Iryu, Y, Sugihara, K, Fujita, K, Nara, M

Proceedings of the 11th International Coral Reef Symposium (Ft. Lauderdale, Florida)　2008
Carbonate deposits on submerged seamounts in the northwestern Pacific Ocean Peer-reviewed

Hideko Takayanagi, Yasufumi Iryu, Tsutomu Yamada, Motoyoshi Oda, Kazuyuki Yamamoto, Tokiyuki Sato, Shun Chiyonobu, Akira Nishimura, Tsutomu Nakazawa, Satoshi Shiokawa

ISLAND ARC　16　(3)　394-419　2007/09

DOI： 10.1111/j.1440-1738.2007.00595.x 　

ISSN： 1038-4871

eISSN： 1440-1738
IODP Expedition 310 reconstructs sea level, climatic, and environmental changes in the South Pacific during the last deglaciation Peer-reviewed

Gilbert F. Camoin, Yasufumi Iryu, Dave B. McInroy, R. Asami, H. Braaksma, G. Cabioch, P. Castillo, A. Cohen, J. E. Cole, P. Deschamps, R. G. Fairbanks, T. Felis, K. Fujita, E. Hathorne, S. Lund, H. Machiyama, H. Matsuda, T. M. Quinn, K. Sugihara, A. Thomas, C. Vasconcelos, K. Verwer, R. Warthmann, J. M. Webster, H. Westphal, K. S. Woo, T. Yamada, Y. Yokoyama

Scientific Drilling　(5)　4-12　2007/09

DOI： 10.2204/iodp.sd.5.01.2007 　

ISSN： 1816-8957 1816-3459
The COral-REef Front (COREF) project Peer-reviewed

Yasufumi Iryu, Hiroki Matsuda, Hideaki Machiyama, Werner E. Piller, Terrence M. Quinn, Maria Mutti

Scientific Drilling　(5)　70-72　2007/09

DOI： 10.2204/iodp.sd.5.13.2007 　

ISSN： 1816-8957 1816-3459
Reef-dwelling marine organisms and Cenozoic reef deposits in the Ryukyu and Daito Islands. Peer-reviewed

Iryu, Y

Chishitsu News　(634)　1-5　2007/06
Publisher:
ISSN： 0009-4854
Plio-Pleistocene reef evolution of Kita-daito-jima, Japan. – In Hubmann, B. and Piller, W. E. (Eds.), Fossil Corals and Sponges. Peer-reviewed

Suzuki, Y, Iryu, Y, Nambu, A, Inagaki, S, Ozawa, S

Proceedings of the 9th International Symposium on Fossil Cnidaria and Porifera, Graz, 2003. – Österreichische Akademie der Wissenschaften Schriftenreiche der Erdwissenschftlichen Kommissionen　17　493-505　2007/06
Paleoenvironmental analyses based on carbon and oxygen isotopic compositions of brachiopod shells: a review. Peer-reviewed

Yamamoto, K, Iryu, Y, Yamada, T

Fossils (Palaeontological Society of Japan)　81　(81)　67-78　2007/03
Publisher: Palaeontological Society of Japan
DOI： 10.14825/kaseki.81.0_67 　

ISSN： 0022-9202

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Stable carbon and oxygen isotopes in skeletal carbonates are powerful tools for reconstructing various paleoenvironmental conditions. Of many marine invertebrates, articulated brachiopods have been preferentially used as a reliable recorder of carbon and oxygen isotopic compositions in the past oceans because: (1) their dense, low-magnesium calcite shells are less susceptible to diagenetic alteration, (2) their calcitic secondary shell layer is assumed to have been precipitated in or near isotopic equilibrium with ambient seawater, and (3) they have extensive geographic distributions throughout the Phanerozoic. Recent investigations, however, have demonstrated that previously proposed criteria to identify diagenetic alteration in fossil brachiopod shells are not unequivocal and that the secondary shell layer of some living brachiopods is not precipitated in isotopic equilibrium with ambient seawater due to kinetic and/or metabolic effects. However, these results argue against a general rejection of availability of isotopic compositions of brachiopod shells as paleoenvironmental proxies. Further geochemical investigations are needed to reveal temporal and spatial variations in isotopic compositions within brachiopod shells for evaluating kinetic and/or metabolic effects and to clarify isotopic modifications due to diagenetic alteration.
Proceedings of the Integrated Ocean Drilling Program, Volume 310 Expedition Reports, Tahiti Sea Level

Camoin, G. F, Iryu, Y, McInroy, D. B, the Expeditio, Scientists (Asami, R, Braaksma, H, Cabioch, G, Castillo, P, Cohen, A. L, Cole, J. E, Deschamps, P, Fairbanks, R. G, Felis, T, Fujita, K, Hathorne, Ed C, Lund, S. P, Machiyama, H, Matsuda, H, Quinn, T. M, Sugihara, K, Thomas, A, Vasconcelos, C. de O, Verwer, K, Webster, J. M, Westphal, H, Woo, K. S, Yamada, T, Yokoyama, Y

Proceedings of the Integrated Ocean Drilling Program, Volume 310 Expedition Reports, Tahiti Sea Level　2007

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Integrated Ocean Drilling Program Management International, Inc., Washington DC and Sapporo
Upper Cretaceous to Pleistocene shallow-water carbonate deposits on submerged seamounts in the northwestern Pacific Ocean

Iryu, Y, Takayanagi, H, Yamada, T, Oda, M, Sato, T, Chiyonobu, S, Nishimura, A, Nakazawa, T

Report on Deep Sea Survey Technology for Natural Resources in Japan, Japan Oil, Gas and Metals National Corporation, Kawasaki　298-324　2007
Thematic section: The COREF project: Coral-reef front migration in the Ryukyu Islands Peer-reviewed

Yasufumi Iryu

ISLAND ARC　15　(4)　391-392　2006/12

DOI： 10.1111/j.1440-1738.2006.00536.x 　

ISSN： 1038-4871
Introductory perspective on the COREF project Peer-reviewed

Yasufumi Iryu, Hiroki Matsuda, Hideaki Machiyama, Werner E. Piller, Terrence M. Quinn, Maria Mutti

ISLAND ARC　15　(4)　393-406　2006/12

DOI： 10.1111/j.1440-1738.2006.00537.x 　

ISSN： 1038-4871
Bathymetry, biota and sediments on the Hirota Reef, Tane-ga-shima - The northernmost coral reef in the Ryukyu Islands Peer-reviewed

Emiko Ikeda, Yasufumi Iryu, Kaoru Sugihara, Hideo Ohba, Tsutomu Yamada

ISLAND ARC　15　(4)　407-419　2006/12

DOI： 10.1111/j.1440-1738.2006.00538.x 　

ISSN： 1038-4871
Th-230/U-234 and C-14 dating of a lowstand coral reef beneath the insular shelf off Irabu Island, Ryukyus, southwestern Japan Peer-reviewed

Keiichi Sasaki, Akio Omura, Tetsuo Miwa, Yoshihiro Tsuji, Hiroki Matsuda, Toru Nakamori, Yasufumi Iryu, Tsutomu Yamada, Yuri Sato, Hiroshi Nakagawa

ISLAND ARC　15　(4)　455-467　2006/12

DOI： 10.1111/j.1440-1738.2006.00541.x 　

ISSN： 1038-4871
Responses of coral reefs to increased amplitude of sea-level changes at the Mid-Pleistocene Climate Transition Peer-reviewed

Kazuyuki Yamamoto, Yasufumi Iryu, Tokiyuki Sato, Shun Chiyonobu, Kenichi Sagae, Eiichi Abe

PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY　241　(1)　160-175　2006/11

DOI： 10.1016/j.palaeo.2006.06.014 　

ISSN： 0031-0182
Evaluation of carbon and oxygen isotopic compositions of brachiopod shells as paleoenvironmental indicators. Peer-reviewed

Yamamoto, K, Iryu, Y, Yamada, T

Earth Sciences　40　(4)　287-300　2006/10
Publisher: The Geochemical Society of Japan
DOI： 10.14934/chikyukagaku.40.287 　

ISSN： 0386-4073

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Carbon and oxygen isotopic compositions of brachiopod shells have been used for the reconstruction of Paleozoic global carbon cycles and seawater temperatures. Brachiopods occur throughout the Phanerozoic and their secondary shell layer consists of low-magnesium calcite. It is assumed that the shells were precipitated in isotopic equilibrium with ambient seawater. Recent studies, however, showed that isotopic composition of secondary shell layer varies due to "vital effects" and that the criteria proposed in previous studies to distinguish the diagenetic alteration of fossil brachiopod shells are not always perfect. In order to increase the reliability of the isotopic composition of brachiopod shells as a proxy for ancient seawater conditions, it is necessary to clarify variations in isotopic composition in a single shell and within and between species by studying modern brachiopods and to compare the variations to the measured environmental conditions such as temperature, salinity, and isotopic composition of seawater. This will allow selection of species and shell portions that best reflect the isotopic composition of ambient seawater. The information about shell ultrastructure, isotopic and trace elemental compositions of modern specimens are also needed to quantify the degree of modification of original isotopic composition resulting from diagenetic alteration by examining fossil forms.
Climatic and oceanographic records from modern coral skeletons for the last several centuries: Reconstruction of interannual, decadal-multidecadal, and centennial variability. Peer-reviewed

Asami, R, Yamada, T, Iryu, Y

Chikyukagaku (Geochemistry)　40　(3)　179-194　2006/09
Publisher: The Geochemical Society of Japan
DOI： 10.14934/chikyukagaku.40.179 　

ISSN： 0386-4073

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Massive hermatypic corals are one of the most excellent archives for reconstructing paleoclimatic and paleoceanographic changes because they commonly live in shallow tropical and subtropical oceans, grow at a rapid rate, and contain a remarkable array of geochemical tracers within their skeletons. In particular, oxygen isotopic composition and Sr/Ca ratio of coral skeletons have been used as proxies for past thermal and hydrological variations in sea surface conditions. Recent investigations on geochemical records of modern long coral cores provide continuous time series of sea surface temperature and salinity in many tropical regions, which document climatic variability on interannual and decadal to multidecadal timescales (El Nino/ Southern Oscillation, Indian Ocean Dipole mode, and Inter-decadal Pacific Oscillation), volcanic eruptions, and global warming. However, high-resolution paleoclimatic records of coral skeletons over the last several centuries are spatially limited and the mechanisms causing the climatic variability remain unclear at present. High-fidelity paleoclimatology should be progressed in order to expand our knowledge on the nature and causes of global climatic changes.
Pleistocene reef development and stratigraphy on Ie-jima, the Ryukyu Islands, southwestern Japan. Peer-reviewed

Takeuchi, Y, Iryu, Y, Sato, T, Chiyonobu, S, Yamada, T, Odawara, K, Abe, E

Proceedings of the 10th International Coral Reef Symposium (Okinawa)　536-546　2006/06
Pliocene to Quaternary carbonate sequence on Okinawa-jima. Peer-reviewed

Iryu, Y, Yamada, T, Matsuda, S, Odawara, K

Proceedings of the 10th International Coral Reef Symposium (Okinawa)　2022-2036　2006/06
Tahiti Sea Level: the last deglacial sea level rise in the South Pacific: offshore drilling in Tahiti (French Polynesia)

Expedition, Scientists (Camoin, G. F, Iryu, Y, McInroy, D. B, Asami, R, Braaksma, H, Cabioch, G, Castillo, P, Cohen, A. L, Cole, J. E, Deschamps, P, Fairbanks, R. G, Felis, T, Fujita, K, Hathorne, Ed C, Lund, S. P, Machiyama, H, Matsuda, H, Quinn, T. M, Sugihara, K, Thomas, A, Vasconcelos, C. de O, Verwer, K, Webster, J. M, Westphal, H, Woo, K. S, Yamada, T, Yokoyama, Y

IODP Preliminary Report, 310　2006
An introductory perspective on responses of coral reefs to Quaternary paleoclimatic and paleoceanographic changes in the Ryukyu Islands Peer-reviewed

Iryu, Y, Matuda, H, Machiyama, H, Piller, W, Quinn, T. M, Mutti, M

Blackwell　15　393-406　2006
Origin of atoll dolomites distinguished by geochemistry and crystal chemistry: Kita-daito-jima, northern Philippine Sea Peer-reviewed

Y Suzuki, Y Iryu, S Inagaki, T Yamada, S Aizawa, DA Budd

SEDIMENTARY GEOLOGY　183　(3-4)　181-202　2006/01

DOI： 10.1016/j.sedgeo.2005.09.016 　

ISSN： 0037-0738
Stratigraphy of the Ryukyu Group in Maeda-misaki area, Okinawa-jima, Ryukyu Islands, Japan. Peer-reviewed

Muraoka, A, Iryu, Y, Odawara, K, Yamada, T, Tokiyuki, S

Galaxea (Journal of the Japanese Coral Reef Society)　(7)　23-36　2005/12/15
Publisher:
DOI： 10.3755/jcrs.2005.23 　

ISSN： 1345-1421
Stratigraphy of the Ryukyu Group on northern Motobu Peninsula, Okinawa-jima, Ryukyu Islands, Japan. Peer-reviewed

Yamamoto, K, Iryu, Y, Sato, T, Abe, E

Journal of the Geological Society of Japan　111　(9)　527-546　2005/09/15
Publisher: The Geological Society of Japan
DOI： 10.5575/geosoc.111.527 　

ISSN： 0016-7630

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The Pleistocene Ryukyu Group, composed of reef complex deposits and carbonate-siliciclastic sediments, crops out extensively on northern Motobu Peninsula, Okinawa-jima, Ryukyu Islands, southwestern Japan. We propose a major revision of the previous stratigraphic scheme for the Group and provide a formal stratigraphic description. The Group comprises the Nakoshi and Kourijima Formations and younger limestones. The Nakoshi Formation is composed of sandstone, siltstone, sandy to silty limestone, and conglomerate, passing laterally into the lowest unit (Unit 1) of the Kourijima Formation. The Kourijima Formation constitutes the main body of the Group reaching 80m in thickness and is exposed at elevations up to 107m. It is divisible into three units (Unit 1, 2, and 3). Unit 1 consists of deep-water deposits represented by detrital limestone associated with rhodolith and Cyclo-clypeus-Operculina limestones. Unit 2 begins with shallow-water coral limestone that grades upward into the deep-water deposits. Unit 3 is composed exclusively of coral limestone. Coral limestones which are exposed sporadically on the pre-Tertiary basement cannot be assigned to any certain unit due to their isolated occurrence. The younger limestones include coral, Cycloclypeus-Operculina, and well sorted detrital limestones, all of which are limited in their distribution and rest unconformably on the Kourijima Formation and pre-Tertiary basement. Calcareous nannofossil biostratigraphy indicates that deposition of the Ryukyu Group started in earliest Quaternary time (1.45-1.65Ma) and continued for more than 0.6 million years (<0.85Ma).
A Preliminary Study on Holocene Warm-temperate Limestone as Paleo-tide Guage Recording Coseismic Movement along Subduction Zone. Peer-reviewed

Maemoku, H, Maeda, Y, Iryu, Y, Yamada, T

Geographical Sciences　60　(3)　4-10　2005/07
Publisher: Hiroshima Geographical Association
DOI： 10.20630/chirikagaku.60.3_136 　

ISSN： 0286-4886
Paleomagnetism of the upper part of the Shinzato Formation (Shimajiri Group) and the Chinen Formation, southern Okinawa-jima, southwestern Japan. Peer-reviewed

Komatsubara, J, Sato, T, Nakagawa, H, Matsumoto, R, Iryu, Y, Matsuda, H, Omura, A, Odawara, K, Takeuchi, R

Journal of the Sedimentological Society of Japan　(61)　5-13　2005/06/30
Publisher:
DOI： 10.4096/jssj1995.61.5 　

ISSN： 1342-310X
Stratigraphy of the Zakimi Formation and the Ryukyu Group in Yomitan area, Okinawa-jima, Ryukyu Islands, Japan. Peer-reviewed

Odawara, K, Iryu, Y, Matsuda, H, Sato, T, Chiyonobu, S, Sakuma, D

Journal of the Geological Society of Japan　111　(6)　313-331　2005/06/15
Publisher: The Geological Society of Japan
DOI： 10.5575/geosoc.111.313 　

ISSN： 0016-7630

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The Pleistocene Ryukyu Group composed of reef complex deposits crops out in Yomitan area, Okinawa-jima, Ryukyu Islands, southwestern Japan. The group rests unconformably on the upper Cenozoic Zakimi Formation and the pre-Tertiary Nago Formation. We propose a major revision of the previous stratigraphic scheme for the Zakimi Formation and the Ryukyu Group, based on new investigations, and provide a formal stratigraphic description. The Zakimi Formation (>40m thick) consists of conglomerate comprising poorly sorted, up to cobble-sized, subrounded gravel derived from the Nago Formation, displaying a clast-supported texture. The Ryukyu Group comprises the Iramina and Sobe Formations in study area. The Iramina Formation, observed in drill cores, is thin (>11m thick) and consists mainly of conglomerate, coral limestone, and detrital limestone. The Sobe Formation unconformably overlies the Iramina Formation, reaches 70m in thickness, and crops out at elevations of up to 80m. It is divisible into five units. Each unit is composed of coral limestone overlain by rhodolith, Cycloclypeus-Operculina, and detrital limestones and shows a deepening-upward sequence. Of these units, Units 4 is most extensively exposed in this area. This unit rests unconformably on Units 2 and 3 at elevations greater than 20m and conformably overlies Unit 3 below the elevation. It is equivalent to the Yontan Limestone in previous stratigraphic literatures. Calcareous nannofossil biostratigraphy indicates that the lower part of the Sobe Formation was deposited in early Pleistocene time, ranging from 0.41-0.85Ma. Stratigraphic position and age-diagnostic nannofossils indicate that the Sobe Formation may be partly correlative to the main body of the Ryukyu Group on Tokuno-shima, Okierabu-jima, Yoron-jima, southern Okinawa-jima, and Miyako-jima.
Interannual and decadal variability of the western Pacific sea surface condition for the years 1787-2000: Reconstruction based on stable isotope record from a Guam coral Peer-reviewed

R Asami, T Yamada, Y Iryu, TM Quinn, CP Meyer, G Paulay

JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS　110　(C5)　1029-1043　2005/05

DOI： 10.1029/2004JC002555 　

ISSN： 0148-0227
Geologic ages of the Chinen Formation and "Reddish Limestone" in Komesu and Giza areas in southern Okinawa-jima based on calcareous nannofossil biostratigraphy. Peer-reviewed

Odawara, K, Iryu, Y, Matsuda, H, Sato, T, Chiyonobu, S, Sakuma, D

Journal of the Geological Society of Japan　111　(4)　224-233　2005/04/15
Publisher: The Geological Society of Japan
DOI： 10.5575/geosoc.111.224 　

ISSN： 0016-7630

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The Chinen Formation in southern Okinawa-jima, southwestern Japan, is composed of calcareous sandstone and sandy limestone correlative with the transitional lithofacies between massive siltstone of the Upper Miocene to Pliocene Shimajiri Group and detrital to reefal limestone of the Pleistocene Ryukyu Group. The "Reddish Limestone" is the lowest lithostratigraphic unit in the Ryukyu Group in southern Okinawa-jima and consists mainly of highly altered detrital and rhodolith limestones. The calcareous nannofossil biostratigraphy of the Chinen Formation and the "Reddish Limestone" in two boring cores from Komesu and Giza areas were studied. Abundant specimens of the calcareous nannofossil, Gephyrocapsa spp. (small), whose base occurred at 2.09 Ma, were recognized in the uppermost Shimajiri Group to large part of the Chinen Formations in the two cores. Although the latest Pliocene datum plane, the last occurrence of Discoaster brouweri. (1.97 Ma), was recovered from the lower Chinen Formation in Komesu core, it was not detected in Giza core due to relatively rare and sporadic occurrence of this genus. It was likely that two early Pleistocene datum planes, the first occurrence of Gephyrocapsa caribbeanica (1.73 Ma) and the first occurrence of G. oceanica (1.65 Ma), were concentrated at the base the "Reddish Limestone". The early Pleistocene datum plane, the first occurrence of Gephyrocapsa spp. (large)(1.45 Ma), is situated in the "Reddish Limestone" in Giza core and possibly at the top of the Limestone in Komesu core. These indicate that the Chinen Formation is correlated with the latest Pliocene (>1.73 Ma) and that the "Reddish Limestone" formed in Early Pleistocene time between 1.65 Ma and 1.21 Ma.
Pliocene to Quaternary Carbonate Sequence in Okinawa-jima

Iryu, Y, Yamada, T, Yamamoto, K

Excursion Guide #3 IODP SSEPs Meeting in Okinawa　1-16　2004/11/15
Carbon and oxygen isotopic composition of a Guam coral and their relationships to environmental variables in the western Pacific Peer-reviewed

R Asami, T Yamada, Y Iryu, CP Meyer, TM Quinn, G Paulay

PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY　212　(1-2)　1-22　2004/09

DOI： 10.1016/j.palaeo.2004.05.014 　

ISSN： 0031-0182
Reply to the Ujiie's comments on "Geological age of the Chinen Formation in southern Okinawa-jima based on calcareous microfossils" Peer-reviewed

Sato, T, Nakagawa, H, Komatsubara, J, Matsumoto, R, Iryu, Y, Matsuda, H, Omura, K, Takeuchi, R

Journal of the Geological Society of Japan　110　(9)　561-563　2004/09
Publisher: The Geological Society of Japan
DOI： 10.5575/geosoc.110.38 　

ISSN： 0016-7630
Ooids from limestones of the Lower Cretaceous Birafu Formation, Kochi Prefecure, Japan-their features and genesis. Invited Peer-reviewed

Ohga, H, Iryu, Y

Journal of the Sedimentological Society of Japan　59　(59)　27-37　2004/06
Publisher: The Sedimentological Society of Japan
DOI： 10.4096/jssj1995.59.27 　

ISSN： 1342-310X

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Sedimentologic and petrographic studies were conducted on ooids from allochthonous limestone bodies in the Lower Cretaceous Birafu Formation, Kochi Prefecture, Shikoku, Japan. The limestone bodies consist mainly of oolitic grainstone in which the total volume of ooids is as high as 70% in contrast with limited contents of terrigenous material (generally<20%). This suggests high-energy environments during the ooid formation and deposition. Ooid diameter varies typically between 0.1 and 0.8mm, with the extremes being 0.05 and 2.0mm, respectively. Nuclei of the ooids are constituted by lithoclasts of quartz and feldspar and bioclasts of mollusks and echinoids. The ooids exhibit a radial microfabric, although micritization of varying degree is common. Radial coatings consist of fibrous crystals 6-15μm long and 1.0-1.5μm in diameter. The ooids afford no evidence of the direct influence of micro-organisms on their formation. With the fibrous shape of the radial ooid crystals, they recall modern high-magnesian or aragonite cements typical of shallow normal marine diagenetic environments, and thus suggest an original composition of this kind. X-ray diffraction and microprobe analyses, however, consistently show MgCO₃-concentration of the ooids below 1%, which implies that mineralogy of the precursor inverted to low-magnesian calcite without loss of crystal morphology when exposed to meteoric-water diagenesis.
A review of Paleoenvironmental reconstructions based on Mg/Ca and Sr/Ca thermometry in coral skeletons. Peer-reviewed

Asami, R, Yamada, T, Iryu, Y

The Quaternary Research　43　(3)　231-245　2004/06
Publisher: Japan Association for Quaternary Research
DOI： 10.4116/jaqua.43.231 　

ISSN： 0418-2642

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Reconstruction of changes in the tropical ocean-atmosphere system in the period prior to the use of instrumental records requires the use of climatic and oceanographic proxies such as corals and tree rings. The elemental ratios (Mg/Ca and Sr/Ca) in massive coral skeletons have been used to calculate high-resolution (weekly to monthly) SST (sea surface temperature) in tropical and subtropical oceans during the Quaternary period because there exist significant relationships between the ratios and SST. However, some investigations indicate that skeletal Mg/Ca and Sr/Ca may be influenced by seawater Mg²⁺/Ca²⁺ and Sr²⁺/Ca²⁺ variations, vital effects, heterogeneity effects, submarine and meteoric diagenesis, and various chemical treatments. If these influences are evaluated quantitatively, the Mg/Ca and Sr/Ca thermometers will provide more accurate past SST than at present.
The Database of Japanese Fossil Type Specimens Described during the 20th Century (Part 3). Peer-reviewed

Iryu, Y

Palaeontological Society of Japan, Special Papers.　(41)　3-30　2004/04
Geological ages of the Chinen Formation in southern Okinawa-jima based on calcareous microfossils. Peer-reviewed

Sato, T, Nakagawa, H, Komatsubara, J, Matsumoto, R, Iryu, Y, Matsuda, H, Omura, A, Odawara, K, Takeuchi, R

Journal of the Geological Society of Japan　110　(9)　561-563　2004/01/15
Publisher: The Geological Society of Japan
DOI： 10.5575/geosoc.110.38 　

ISSN： 0016-7630

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The Chinen Formation in southern Okinawa-jima, southwestern Japan, is composed of calcareous sandstone and sandy limestone correlative with the transitional lithofacies between massive siltstone of the upper Pliocene Shinzato Formation of the Shimajiri Group and detrital to reefal limestone of the Pleistocene Ryukyu Group. The calcareous nannofossil and planktonic forminiferal biostratigraphy of the Chinen Formation in the Urizun and Golf Links sections, both located near the type locality, were studied. Abundant specimens of the calcareous nannofossils, Gephyrocapsa spp. (small), whose base occured at 2.09 Ma, was recognized throughout the uppermost Shinzato to Chinen Formations in the Urizun section. Three latest Pliocene to early Pleistocene datum planes, the last occurrence of Discoaster spp. (1.97 Ma), the first occurrence of Gephyrocapsa caribbeanica (1.73 Ma) and the first occurrence of G. oceanica (1.65 Ma), were concentrated in the lower part of the Chinen Formation. The latest Pliocene planktonic foraminifera datum planes, the first occurrence of Globorotalia (Globorotalia) truncatulinoides and the coiling change of Pulleniatina spp. from dextral to sinistral, were also recognized in the same horizon in the lower part of the Chinen Formation. These indicate that the Chinen Formation correlates with the latest Pliocene to earliest Pleistocene between 2.09 Ma and 1.65 Ma. The Pliocene/Pleistocene boundary, indicated by the first occurrence of G. caribbeanica (1.73 Ma), is situated in the lower part of the Chinen Formation in which a chronostratigraphic gap of 0.3 m.y. is present. Conversely, the stratigraphic distribution of calcareous nannofossils and planktonic foraminifera in the Golf links section, shows that the disconformity recognized in the lower part of the Chinen Formation at the Urizun section, is correlated with the boundary between the Shinzato and Chinen Formations. The lithostratigraphic boundary beween the Shinzato and Chinen Formations in these adjacent sections, does not correspond with the chronostratigraphy.
Stratigraphy of reef deposits on Kita-daito-jima, Japan. Peer-reviewed

Nanbu, A, Inagaki, S, Ozawa, S, Suzuki, Y, Iryu, Y

Journal of the Geological Society of Japan　109　(11)　617-634　2003/11
Publisher: The Geological Society of Japan
DOI： 10.5575/geosoc.109.617 　

ISSN： 0016-7630

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Kita-daito-jima is a carbonate island lying on a lithospheric bulge of the Philippine Sea Plate. We provide a formal stratigraphic description of the coral reef deposits on this island. The deposits comprise the Daito Formation (>2.0 Ma) overlain by the Kaigunbo Formation (〜12.3 ka) . The Daito Formation is divisible into three units. Unit 1 is dominated by coral framestone rich in massive corals and crops out in the interior basin. Unit 2, resting unconformably on Unit 1, is subdivided into two subunits; lower Subunit 2a and upper Subunit 2b. The lower subunit comprises reef-core facies that constitutes the main body of peripheral rim and backreef facies exposed at the cliffs lining the interior basin. The reef-core facies is represented by coral framestone associated with coral bafflestone. The lower backreef facies consists mainly of rudstone and the upper backreef facies is composed chiefly of coral framestone/bafflestone frequently containing Halimeda segments. Subunit 2b, cropping out around the peak of this island, is constructed by coral framestone and bioclastic packstone. Unit 3 is exposed sporadically on the east coast and unconformably overlies the reef-core facies of Subunit 2a. This unit consists of cross-bedded bioclastic packstone associated with coral framestone. Stratigraphic succession, configuration of lithofacies, and coral assemblages indicate that Unit 1 formed in a table reef without lagoonal environment and that thick atoll deposits accumulated on karstified limestone during the deposition of Subunit 2a. Then, the atoll may have been progressively degraded and no distinct reefs formed at the deposition of Subunit 2b. Shoal and coral patches were scattered on eastern part of the island during the deposition of Unit 3. The Kaigunbo Formation occurs abutting on the coastal cliff at elevations less than llm and consists of framestone, which indicates limited fringing reef formation at the last interglacial stages.
The Ryukyu Group (Pleistocene coral reef complex deposits) on Toku-no-shima, Kagoshima Prefecture, Japan. Peer-reviewed

Yamada, T, Fujita, K, Iryu, Y

Journal of the Geological Society of Japan　109　(9)　495-517　2003/09/15
Publisher: The Geological Society of Japan
DOI： 10.5575/geosoc.109.495 　

ISSN： 0016-7630

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The Ryukyu Group, consisting of Pleistocene reef complex deposits that laterally pass into terrigenous sediments, crops out on Toku-no-shima, Ryukyu Islands, southwestern Japan. We propose a major revision of the previous stratigraphic scheme for the Ryukyu Group and provide a formal stratigraphic description. The Pleistocene sequences comprise the Tokunoshima and Metegu Formations, in ascending order, on this island. The Tokunoshima Formation reaches 140 m in thickness and is exposed extensively, covering peripheral areas of the island at elevations less than 210 m. It is divisible into two units, each consisting of proximal coral limestone and distal rhodolith, Cyclo-clypeus-Operculina, and detrital limestones. The Metegu Formation resting unconformably on the Tokunoshima Formation is composed mainly of thin (< 5 m) coral limestone. It is exposed at limited outcrops in southern parts of the island, ranging in elevation from 20 to 60 m. Stratigraphic position, known age-diagnostic nannofossils, and uranium-series and ESR dates indicates that the Tokunoshima Formation may be correlative to the main body of the Ryukyu Group on Okierabu-jima and Yoron-jima. An ESR date denotes that the Metegu Formation accumulated at > 146 ka.
Stratigraphy of the Upper Cenozoic deposits on the neck of Motobu Peninsula, Okinawa-jima, Ryukyu Islands, Japan. Peer-reviewed

Yamamoto, K, Iryu, Y, Nakagawa, H, Sato, T, Matsuda, H

Quaternary Research (Daiyonki Kenkyu)　42　(4)　279-294　2003/08/01
Publisher: Japan Association for Quaternary Research
DOI： 10.4116/jaqua.42.279 　

ISSN： 0418-2642

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Upper Pliocene to lower Pleistocene deposits extensively crop out around the neck of Motobu Peninsula, Okinawa-jima, Ryukyu Islands, southwestern Japan. We propose a major revision of the previous stratigraphic scheme for the upper Pliocene to lower Pleistocene deposits and provide a formal stratigraphic description. These deposits are divided into the Guga and Nakoshi Formations, in ascending order. The Guga Formation rests unconformably on the pre-Tertiary rocks and consists mainly of conglomerate. The Nakoshi Formation conformably overlies the Guga Formation and is composed chiefly of calcareous siltstone/sandstone. These deposits pass laterally into reef-complex limestone (the Ryukyu Group) which is distributed on the northern to western part of Motobu Peninsula. Calcareous nannofossil biostratigraphy indicates that the upper parts of the Guga Formation were deposited in early Pleistocene time, and that the lowest part of the limestone and the Nakoshi Formation are coeval, ranging in ages from 1.45-1.65Ma. This is the oldest known age of the Ryukyu Group. Coral reefs formed and the coeval siliciclastic and calcareous sediments accumulated on Motobu Peninsula in early Pleistocene time. In contrast, sedimentation prevailed by calcareous muds/sands and sandy carbonates in middle to southern Okinawa-jima, which is presumed to have been shelf edge to shelf slope at that time.
ドラフトと顕微鏡で地史を解く鍵を探そう！—砂の耐酸重鉱物分析で見つかった十字石・藍晶石． Peer-reviewed

宇留野勝敏, 北上川砂研究グループ

地学教育と科学運動　43　(43)　29-32　2003/08
Publisher:
ISSN： 0389-3766
Holocene sea-level change and tectonic uplift deduced from raised reef terraces, Kikai-jima, Ryukyu Islands, Japan Invited Peer-reviewed

K Sugihara, T Nakamori, Y Iryu, K Sasaki, P Blanchon

SEDIMENTARY GEOLOGY　159　(1-2)　5-25　2003/06

DOI： 10.1016/S0037-0738(03)00092-7 　

ISSN： 0037-0738

eISSN： 1879-0968
Scientific background and drilling plans for the proposal "Coral-reef front migration in the Ryukyu Arc: Responses of high latitude coral reefs to Quaternary climatic changes in Northwestern Pacific". Invited Peer-reviewed

Matsuda, H, Iryu, Y, Machiyama, H

Chikyu Monthly Symposium　(40)　292-298　2003/04
Calcareous algae as paleoenvironmental indicators. Peer-reviewed

Iryu, Y, Matsuda, S

Chishitsu News　(575)　34-41　2002/07
Proceedings of the Ocean Drilling Program, Scientific Results, Volume 182. Peer-reviewed

Machiyama, H, Yamada, T, Kaneko, N, Iryu, Y, Odawara, K, Asami, R, Matsuda, H, Mawatari, S. F, Bone, Y, James, N. P

Ocean Drilling Program, Texas A & M University, Texas　1-29　2002/05
Stratigraphy of the Chinen Formation and the Ryukyu Group on islands off Katsuren Peninsula, Okinawa-jima, Ryukyu Islands, Japan. Peer-reviewed

Oshimizu, T, Iryu, Y

Journal of the Geological Society of Japan　108　(5)　318-335　2002/05
Publisher: The Geological Society of Japan
DOI： 10.5575/geosoc.108.318 　

ISSN： 0016-7630

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The Pleistocene Ryukyu Group composed of reef complex deposits crops out on six islands off Katsuren Peninsula, Okinawa-jima, Ryukyu Islands, southwestern Japan. It conformably overlies Plio-Pleistocene sandy limestone and calcareous mudstone of the Chinen Formation containing abundant bioclasts and rests unconformably on Pliocene siltstone of the Shimajiri Group. We propose a major revision of the previous stratigraphic scheme for the Ryukyu Group and provide a formal stratigraphic description. The Ryukyu Group comprises the Yokatsu and Minatogawa Formations, in ascending order, on these islands. The Yokatsu Formation constitutes the main body of the group exceeding 30m in thickness and is exposed at elevations up to 125m. It is divisible into five units. Each unit comprises coral limestone and overlying rhodolith, Cycloclypeus-Operculina, and detrital limestones, showing a deepening-upward sequence. The Minatogawa Formation rests unconformably on the Yokatsu Formation, reaches 30m in thickness, and consists of well-sorted detrital and coral limestones that are thought to have been deposited in a shallow lagoon (moat);its surface exposure is confined to the areas at elevations less than ca. 40m in Ikei-jima and Tsuken-jima. Geologic ages of the limestones on these islands are unknown at this time.
Carbon and oxygen isotopes of cool-water bryozoans from the Great Australian Bight, and their paleoenvironmental significance Peer-reviewed

Machiyama, H, Yamada, T, Kaneko, N, Iryu, Y, Odawara, K, Asami, R, Matsuda, H, Mawatari, S.F, Bone, Y, James, N.P

Proc. ODP, Sci. Results, 182, <http://www-odp.tamu.edu/publications/182_SR/007/007.htm>　2002
Pleistocene coral reef deposits (the Ryukyu Group) on Kume-jima, Okinawa Prefecture, Japan. Peer-reviewed

Ehara, Y, Iryu, Y, Nakamori, T, Odawara, K

Journal of the Japanese Coral Reef Society　3　(3)　13-24　2001/12

DOI： 10.3755/jcrs.2001.13 　
Pleistocene reef development in the southwest Ryukyu Islands, Japan Invited Peer-reviewed

N Sagawa, T Nakamori, Y Iryu

PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY　175　(1-4)　303-323　2001/12

DOI： 10.1016/S0031-0182(01)00377-7 　

ISSN： 0031-0182
Holocene SSTs inferred from oxygen isotopic composition of fossil corals.

Tsutomu Yamada, Hisako Kobayashi, Ryuji Asami, Yasufumi Iryu

「平成12年度深田研究助成」研究報告　131-144　2001/09/30
Can Bryozoan isotopes be used as a paleoceanographic proxy?: preliminary results of isotopic compositions of bryozoans from the Great Australian Bight, ODP Leg 182. Peer-reviewed

Machiyama, H, Yamada, T, Kaneko, N, Iryu, Y, Odawara, K, Asami, R, Matsuda, H, Mawatari, S, Bone, Y, James, N.P

The Journal of the Sedimentological Society of Japan　53　117-120　2001/07/25
Coral reef deposits of the Pleistocene Ryukyu Group in Irabu-jima and its environs. Peer-reviewed

Sagawa, N, Nakamori, T, Iryu, Y

The Journal of the Sedimentological Society of Japan.　53　114-116　2001/07
Evolution of reef biota from Cretaceous to present in relation to carbon cycle. Peer-reviewed

Nakamori, T, Iryu, Y

Fossils (Palaeontological Society of Japan)　68　35-37　2000/03
Publisher: Palaeontological Society of Japan
DOI： 10.14825/kaseki.68.0_35 　

ISSN： 0022-9202
Early Holocene coral δ¹⁸O-based sea surface temperature. Peer-reviewed

Kiyama, O, Yamada, T, Nakamori, T, Iryu, Y

The Quaternary Research　39　(1)　69-80　2000/02
Publisher: Japan Association for Quaternary Research
DOI： 10.4116/jaqua.39.69 　

ISSN： 0418-2642

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Carbon and oxygen stable isotope measurements were conducted on Holocene (9.2kyrs BP) and present-day hermatypic corals (Porites sp.) collected at Shidooke, Kikai Island, Ryukyu Islands. Those in modern corals show annual cycles which can be converted into time-series oscillations based on annual bands and temperature-dependency of δ¹⁸O values. The data clearly show that δ¹³C and δ¹⁸O negatively covariance, occurring approximately 120-150° out of phase (negative peaks of δ¹³C precede negative ones of δ¹⁸O). Also distinguished are distinctive negative covariance between δ¹⁸O and sea surface temperatures (SSTs) and indistinctive positive covariance between δ¹³C and solar radiation. Based on the relationship between δ¹⁸O and SST, a δ¹⁸O-based thermometer is proposed for present-day corals. This thermometer is modified to be applicable for Holocene forms by taking account of ¹⁸O-enrichment caused by increased polar ice volumes. The SSTs calculated at 9.2kyrs BP by using a modified thermometer indicate that annual mean SST at that time was about 2.7°C higher than at present. Our result is significantly higher than generally-accepted estimates (0 to 2°C lower than the present). It is highly probable that the conflict is ascribed mainly to disequilibrium aragonite precipitation by corals from seawater (vital effect).
Biogeochemical contrasts between mid-Cretaceous carbonate platforms and Cenozoic reefs Peer-reviewed

Y Iryu, T Yamada

ISLAND ARC　8　(4)　475-490　1999/12

DOI： 10.1046/j.1440-1738.1999.00250.x 　

ISSN： 1038-4871
ODP contributions to sedimentological and geochemical studies on shallow water carbonates. Invited Peer-reviewed

Iryu, Y, Matsuda, H, Machiyama, H

Chikyu Monthly　21　(11)　702-710　1999/11
Publisher:
ISSN： 0387-3498
Scientific significance of shallow water drilling. Invited Peer-reviewed

Matsuda, H, Hoyanagi, K, Iryu, Y, Saito, Y, Machiyama, H

Chikyu Monthly　21　(11)　697-702　1999/11
Coral bleaching, geological ages, and adaptation to high sea surface temperatures. Peer-reviewed

Sugihara Kaoru, Iryu Yasufumi, Nakamori Toru

Galaxea, Journal of the Japanese Coral Reef Society　1　(1)　89-95　1999/10
Publisher: The Japanese Coral Reef Society
DOI： 10.3755/jcrs.1999.89 　

ISSN： 1345-1421

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Coral bleaching was described in Kikai-jima (Kikai Island) in October, 1998. Mortality of coral species belonging to the families Acroporidae and Pocilloporidae was the highest of all scleractinian corals in this island. In contrast, some species of the genera Psammocora and Pavona were never or seldom damaged. These results were similar to those observed in the other Indo-Pacific regions. Significant differences in mortality among families could be attributed to the their geological ranges. The species that were free from appreciable damages by bleaching belong to the families which first appeared in the geological periods when the climate was globally warm (greenhouse periods).
Proposals for scientific shallow water drilling into carbonate sequences. Invited Peer-reviewed

Iryu, Y, Matsuda, H

Chikyu Monthly　21　(11)　735-740　1999/07
Depositional and diagenetic history of Kita-daito-jima for the last 25 million years. Invited Peer-reviewed

Inagaki, S, Iryu, Y

Chikyu Monthly　21　(11)　718-723　1999/07
Cyanobacterial origin of microcrystalline cements from Pleistocene rhodoliths and coralline algal crusts of Okierabu-jima, Japan. Peer-reviewed

Kazmierczak Jozef, Iryu Yasufumi

Acta Palaeontologica Polonica　44　117-130　1999/04
Pleistocene coral reef deposits(the Ryukyu Group)on Yoron-jima, Kagoshima Prefecture, Japan Peer-reviewed

Odawara, K, Iryu, Y

The Journal of the Geological Society of Japan　105　(4)　273-288　1999/04
Publisher: The Geological Society of Japan
DOI： 10.5575/geosoc.105.273 　

ISSN： 0016-7630

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The Ryukyu Group, composed of Pleistocene reef complex deposits laterally passing into terrigenous sediments, extensively crops out on Yoron-jima, Ryukyu Islands, southwestern Japan. Our investigation leads to a major revision of the previous stratigraphic scheme. This paper aims to provide a formal stratigraphic description of the Group on Yoron-jima. The Pleistocene sequences comprise three groups of strata. The lowest Ugachi and Mugiya Formations consist of partly-karstified coral limestone ; their surface exposures are confined in the type localities. The stratigraphic relationship between them remains unknown. The Yoronjima Formation which unconformably overlies the Ugachi and Mugiya Formations reaches 55 m in thickness and is exposed extensively, covering most of the island. It is divisible into three units, each consisting of proximal coral limestone and distal rhodolith, Cycloclypeus-Operculina, and detrital limestone. The Chichizaki and Tomori Formations unconformably resting on the Yoronjima Formation are composed mainly of thin (<10 m) coral limestone. They crop out on the southern and eastern peripheries of the island at elevations less than ca. 20 m. The relation between them is uncertain. On stratigraphic position and known age-diagnostic nannofossils, the Yoronjima Formation may be correlative to the main body of the Ryukyu Group on Okierabu-jima (lower and upper units) and Toku-no-shima (units 1,2 and 3), ranging in age from 390 to 890 ka, while the ages of the other formations are left open.
Sedimentation of the Upper Jurassic Koike Limestone, Somanakamura destrict, northeastern Japan. Peer-reviewed

Kiyama, O, Iryu, Y

Journal of the Sedimentological Society of Japan　47　(47)　17-31　1998/04
Publisher: The Sedimentological Society of Japan
DOI： 10.4096/jssj1995.47.17 　

ISSN： 1342-310X

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The middle Jurassic to lowermost Cretaceous Somanakamura Group crops out in an area along the eastern margin of the Abukuma Mountains, Fukushima Prefecture, northeast Japan. Shallow marine carbonates, 35-meter thick, constitute the upper part of the Nakanosawa Formation, one of the constituent formations of the group. The carbonate sequence named the Koike Limestone is Tithonian in age. Stratigraphical and sedimentological investigations reveal that the carbonate sequence is divisible into five sedimentary units, each of which consists of the grainstone/packstone/wackestone with abundant oncoids and/or peloids and skeletal and non-skeletal grains with micrite coatings, that grades upward into the coral floatstone. The former is thought to have been formed in open, high-energy marine environment while the latter in restricted low-energy one. These data are taken to suggest that relative transgressions intermittently occurred five times during the deposition of the Koike Limestone. The pattern of sea-level changes inferred from the depositional sequence of the middle to upper Somanakamura Group agrees well with the long term eustatic curve derived from coastal onlap.
Pleistocene Reef Complex Deposits in the Central Ryukyus, South-Western Japan Peer-reviewed

Y. Iryu, T. Nakamori, T. Yamada

Reefs and Carbonate Platforms in the Pacific and Indian Oceans (Special Publication Number 25 of the International Association of Sedimentologists)　197-213　1998
Publisher: Blackwell Publishing Ltd.
DOI： 10.1002/9781444304879.ch10 　
Quaternary and Tertiary Subtropical Carbonate Platform Development on the Continental Margin of Southern Queensland, Australia Peer-reviewed

J. F. Marshall, Y. Tsuji, H. Matsuda, P. J. Davies, Y. Iryu, N. Honda, Y. Satoh

Reefs and Carbonate Platforms in the Pacific and Indian Oceans (Special Publication Number 25 of the International Association of Sedimentologists)　163-195　1998
Publisher: Blackwell Publishing Ltd.
DOI： 10.1002/9781444304879.ch9 　
Leg 143 : Cretaceous carbonate platform sediments on the Mid-Pacific Mountains. Peer-reviewed

Iryu, Y

Chikyu Monthly　(19)　16-20　1997/10
Pleistocene fore-reef rhodoliths from the Ryukyu Islands, southwestern Japan. Peer-reviewed

Iryu Yasufumi

Proceedings of the 8th International Coral Reef Symposium　1　749-754　1997/10
Hydrolithon murakoshii sp nov (Corallinaceae, rhodophyta) from Ishigaki-jima, Ryukyu Islands, Japan Peer-reviewed

Y. Iryu, S. Matsuda

PHYCOLOGIA　35　(6)　528-536　1996/11

ISSN： 0031-8884
Standard lithostratigraphic succession of the Paleozoic Systems in South Kitakami Terrane and the geologic significance of"Hayachine Tectonic Belt" Peer-reviewed

Kawamura, T, Iryu, Y, Kawamura, M, Machiyama, H, Yoshida, K

The 103rd Annual Meeting of the Geological Society of Japan　59-97　1996/03
DEVELOPMENT OF CORAL-REEFS OF THE RYUKYU ISLANDS (SOUTHWEST JAPAN, EAST-CHINA-SEA) DURING PLEISTOCENE SEA-LEVEL CHANGE Peer-reviewed

T NAKAMORI, Y IRYU, T YAMADA

SEDIMENTARY GEOLOGY　99　(3-4)　215-231　1995/11

DOI： 10.1016/0037-0738(95)00045-A 　

ISSN： 0037-0738
DISTRIBUTION OF MARINE ORGANISMS AND ITS GEOLOGICAL SIGNIFICANCE IN THE MODERN REEF COMPLEX OF THE RYUKYU ISLANDS Peer-reviewed

Y IRYU, T NAKAMORI, S MATSUDA, O ABE

SEDIMENTARY GEOLOGY　99　(3-4)　243-258　1995/11

DOI： 10.1016/0037-0738(95)00047-C 　

ISSN： 0037-0738
Cretaceous limestones on the Mid-Pacific Mountains - scientific results of Ocean Drilling Program Leg 143 - Peer-reviewed

Iryu, Y, ODP Leg, Shipboard Scientific Party

Chikyu Monthly　16　(7)　412-417　1994/07
Carbonate depositional history in Kita-daito-jima, Okinawa, Japan. Peer-reviewed

Nakamori, T, Iryu, Y, Onozawa, S, Mori, K

Chikyu Monthly　16　(7)　401-406　1994/07
Taxonomic studies on the Neogoniolithon fosliei complex (Corallinoceae, Rhodophyta) in the Ryukyu Islands. Peer-reviewed

Iryu Yasufumi, Matsuda Shinya

Transactions and Proceedings of the Palaeontological Society of Japan　(174)　426-448　1994/06
Trace elements in the standard carbonate samples by PIXE analysis.

Yamada, T, Nakamori, T, Iryu, Y, Hirunuma, N

CYRIC Annual Report 1993　1993　90-92　1994/04
Publisher: Cyclotron and Radioisotope Center, Tohoku University
Examining guyots in the Mid Pacific Mountains Peer-reviewed

ODP Leg, Shipboard Scientific Party

Eos (American Geophysical Union)　74　201-206　1993/05
Recent carbonate sediments off Ryukyu Islands.

Tsuji, Y, Nakamori, T, Iryu, Y, Matsuda, H, Matsuda, S, Nohara, M

Journal of the Geological Society of Japan　99　(3)　v-vi　1993/03
Publisher: The Geological Society of Japan
ISSN： 0016-7630
NORTHWESTERN PACIFIC ATOLLS AND GUYOTS - ODP LEG 143 PRELIMINARY-RESULTS Peer-reviewed

F BAUDIN, H ARNAUD, WW SAGER, EL WINTERER, J FIRTH, PE BAKER, T BRALOWER, P CASTILLO, P COOPER, PG FLOOD, GOLOVCHENKO, X, Y IRYU, M IVANOV, HC JENKYNS, JAM KENTER, IO MURDMAA, J MUTTERLOSE, Y NOGI, CK PAULL, E POLGREEN, U ROHL, WV SLITER, A STRASSER, NHM SWINBURNE, JA TARDUNO, R VANWAASBERGEN

COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE II　316　(4)　505-511　1993/02

ISSN： 1251-8069
Atolls et guyots du Pacifique Nord-Ouest: re´sultats pre´liminaires du Leg ODP 143

Baudin, F, Arnaud, H, Sager, W.W, Winterer, E.L, Firth, J, Baker, P.E, Bralower, T, Castillo, P, Cooper, P, Flood, P.G, Golovchenko, X, Iryu, Y, Ivanov, M, Jenkyns, H.C, Kenter, J.A.M, Murdmaa, I.O, Mutterlose, J, Nogi, Y, Paull, C.K, Polgreen, E, Ro ̈hl, U, Sliter, W.V, Strasser, A, Swinburne, N.H.M, Tarduno, J.A, van Waasbergen, R

C. R. Acad.Sci. Paris　316, 505-511　1993
Rhodoliths on the deep forereef of Okinawa-jima, Ryukyu Islands. Peer-reviewed

Matsuda, S, Iryu, Y, Nohara, M

Journal of the Sedimentological Society of Japan.　37　109-111　1992/11
Reef response to Pleistocene climatic changes Peer-reviewed

Iryu, Y, Nakamori, T, Yamada, T

Journal of the Sedimentological Society of Japan.　(37)　107-109　1992/11
Fossil nonarticulated coralline algae as depth indicators for the Ryukyu Group Peer-reviewed

Iryu Yasufumi

Transactions and Proceedings of the Palaeontological Society of Japan, New Series　167　(167)　1165-1179　1992/09
WATER CIRCULATION AND CARBON FLUX ON SHIRAHO CORAL-REEF OF THE RYUKYU ISLANDS, JAPAN Peer-reviewed

T NAKAMORI, A SUZUKI, Y IRYU

CONTINENTAL SHELF RESEARCH　12　(7-8)　951-970　1992/07

ISSN： 0278-4343
A unit of lithostratigraphic classification of the Ryukyu Group, Pleistocene reef complex deposits Peer-reviewed

Iryu, Y, Nakamori, T, Yamada, T

Journal of the Sedimentological Society of Japan.　36　(36)　57-66　1992/05

DOI： 10.14860/jssj1972.36.57 　
Origin of allochthonous limestone bodies of the Miocene Megami Formation, Kakegawa district, Shizuoka Prefecture. Peer-reviewed

Nakamori, T, Iryu, Y, Sasazawa, K, Mori, K

Journal of the Geological Society of Japan　97　(12)　987-1000　1991/12
Publisher: The Geological Society of Japan
DOI： 10.5575/geosoc.97.987 　

ISSN： 0016-7630
Organic and inorganic carbon production on the coral reef of Ishigaki-jima. Peer-reviewed

Iryu, Y, Nakamori, T, Suzuki, A

Marine, monthly　23　759-770　1991/12
Algae and Seagrasses of the Coral Reef on the East of Kara-dake, Ishigaki-Island, Ryukyu Islands. Peer-reviewed

Iryu, Y

Published by World Wide Fund for Nature Japan　159-171　1991/10
Algae and Seagrasses of Coral Reefs around Ishigaki Island and its adjacent Area Peer-reviewed

Iryu, Y

Published by World Wide Fund for Nature Japan　73-86　1991/10
A preliminary report on Pleistocene sea level changes recorded in the Ryukyu Group on Toku-no-shima and Okierabu-jima, Ryukyu Islands. Peer-reviewed

Iryu, Y, Yamada, T

Essays in Geology Professor Hisao Nakagawa Commemorative Volume.　73-83　1991/10
Publisher:
MODEL FOR A SELF-REPAIRING SYSTEM OF NONARTICULATED CORALLINE ALGAE Peer-reviewed

T NAKAMURA, YP GUNJI, Y IRYU

BIOSYSTEMS　26　(2)　99-115　1991

ISSN： 0303-2647
Depositional environment of Halimeda limestone of the Ryukyu Group on Yonaguni-jima Peer-reviewed

Iryu, Y, Suzuki, A

Fossils (Palaeontological Society of Japan)　49　13-22　1990/12
Depth distribution abundance and species assemblages of nonarticulated coralline algae in the Ryukyu Islands, southwestern Japan Peer-reviewed

Iryu Yasufumi, Matsuda Shinya

Proceedings of the 6th International Coral Reef Symposium　3　101-106　1988/08
Distribution of nongeniculate coralline algae in coral reefs in the Ryukyu Islands. Peer-reviewed

Iryu, Y, Matsuda, S

Marine sciences, monthly　19　524-529　1987/09
Topography and Marine Sediments in a Range of Rhodoliths. Peer-reviewed

Iryu, Y, Hayasaka, S

Prompt Reports of the Comprehensive and Scientific Survey in the Ryukyu Archipelago　2　(2)　117-121　1985/10
Marine sediments and benthos collected from areas of the Southern East China Sea and off Tarama Island of Ryukyu Island. Invited

Yamaguchi, T, Hayasaka, S, Iryu, Y

Prompt Reports of the Comprehensive and Scientific Survey in the Ryukyu Archipelago　2　73-80　1985/03
Study on the Recent rhodoliths around the Ryukyu Islands

Iryu, Y

Prompt Reports of the Comprehensive and Scientific Survey in the Ryukyu Archipelago　2　123-133　1985/03
Discovery of Recent deep water rhodolihts from the Ryukyu Islands, southwestern Japan, and its significance. Invited

Iryu, Y

Prompt Reports of the Comprehensive and Scientific Survey in the Ryukyu Archipelago　1　47-55　1984/03
Staurolite and kyanite from river sand derived from the probable Pre-Silurian basement of Southern kitakami Mountains (Preliminary report) Peer-reviewed

Kitakami River, Research Group

Journal of the Geological Society of Japan　88　(5)　405-408　1982/05
Publisher: The Geological Society of Japan
DOI： 10.5575/geosoc.88.405 　

ISSN： 0016-7630

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Misc. 17

Integrated earth and biological sciences unraveled an enigma of the Ryukyu Islands Invited

Yasufumi Iryu

Civil Engineering Consultant　305　12-15　2024/10/15
Publisher: The Japan Civil Engineering Consultants Association
Organisms that have survived Earth's tectonic activity Invited

Yasufumi Iryu

Ebucheb　93　2-5　2024/05
OMSP Hypothesis - A new interpretation of the geological history and phylogeography pattern of the Central Ryukyus (in Japanese; original title translated) Invited

Yasufumi Iryu

Gakushikai Kaiho　(965)　64-69　2024/03/01
Survival in climatic crisis

Kaiyo monthly　43　(6)　340-347　2011/06
Publisher: 海洋出版
ISSN： 0916-2011
Paleontology of Brachiopods

井龍康文, 西弘嗣

Fossils　81　(0)　45-45　2007
Publisher: Palaeontological Society of Japan
DOI： 10.14825/kaseki.81.0_45 　

ISSN： 0022-9202
Quaternary reef development in Okinawa-jima, Ryukyu Islands, southwestern Japan

IRYU, Y, YAMAMOTO, K, HUMBLET, M

Field Excursion Guidebook, 17th International Sedimentological Congress　1-24　2006/07/01
Traces of plaeotsunamis in the Shetland Islands. Peer-reviewed

Ishizawa, T, Watanabe, M, Goto, K, Ikehara, K, Wallis, S, Iryu, Y

Journal of the Geological Society of Japan 122, I-II.　122　I-II　2006/03/15
Interannual and decadal variability of sea surace condition recorded in Guam coral for the years 1787-2000

R Asami, T Yamada, Y Iryu

GEOCHIMICA ET COSMOCHIMICA ACTA　67　(18)　A27-A27　2003/09

ISSN： 0016-7037
Recent and Pleistocene Coral Reefs in the Ryukyu Islands, Japan

Nakamori, T, Iryu, Y, Matsuda, S

8th International Symposium on Fossil Cnidaria and Porifera, Field Trip A1　33　1999
サンゴ礁の海草・海藻．

井龍康文

WWFネイチャーシリーズ② 白保のサンゴ礁　14-15　1995/01/31
Publisher: WWF Japan （財）世界自然保護基金日本委員会
ダイバーのための海洋雑学 43サンゴ礁の一生

井龍康文

DIVER　(119)　63-63　1991/05
Publisher: SUN EIGHTY
ダイバーのための海洋雑学 42円石藻

井龍康文

DIVER　(118)　49-49　1991/04
Publisher: SUN EIGHTY
ダイバーのための海洋雑学 39共生藻

井龍康文

DIVER　(115)　43-43　1991/01
Publisher: SUN EIGHTY
ダイバーのための海洋雑学 36藍藻

井龍康文

DIVER　(112)　89-89　1990/10
Publisher: SUN EIGHTY
ダイバーのための海洋雑学 35無節サンゴモ

井龍康文

DIVER　(111)　67-67　1990/09
Publisher: SUN EIGHTY
ダイバーのための海洋雑学 33流れ藻

井龍康文

DIVER　(109)　59-59　1990/07
Publisher: SUN EIGHTY
ダイバーのための海洋雑学 28オニヒトデ

井龍康文

DIVER　(103)　57-57　1990/01
Publisher: SUN EIGHTY

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Books and Other Publications 25

Earth地球大全史

Packham, Chris, Cohen, Andrew, 関谷, 冬華, 井龍, 康文

日経ナショナルジオグラフィック,日経BPマーケティング (発売)　2024/03

ISBN: 9784863136038
はじめての地質学

天野一男, 荒戸裕之, 井龍康文, 浦野成昭, 須藤茂, 西山賢一, 平田大二, 星博幸, 向山栄, 矢島道子, 斉藤靖二, 渡辺寧

ベレ出版　2017/09/25
Proceedings of the Integrated Ocean Drilling Program, Volume 325 Expedition Reports, Great Barrier Reef Environmental Changes..

Webster, J.M, Yokoyama, Y, Cotterill, C, the Expeditio, Scientists

Integrated Ocean Drilling Program Management International, Inc.　2011
サンゴ礁学

井龍康文

東海大学出版会　2011
IODP Preliminary Report, 325

Expedition, Scientists

2010
日本地方地質誌8「九州・沖縄地方」

井龍康文, 松田博貴

朝倉書店　2010
古生物学事典

井龍康文

朝倉書店　2010
Proceedings of the Inegrated Ocean Drilling Program, Volume 310 Expedition Reports, Tahiti Sea Level.

Camoin, G. F, Iryu, Y, McInroy, D. B, the Expeditio, Scientists

Integrated Ocean Drilling Program Management International, Inc., Washington DC and Sapporo.　2007/02
Field Excursion Guidebook, 17th International Sedimentological Congress, Fukuoka, Japan

Iryu, Y, Yamamoto, K, Humblet, M

Sed. Soc. Japan,　2006/09/01
Tahiti Sea Level: the last deglacial sea level rise in the South Pacific: offshore drilling in Tahiti (French Polynesia). doi: 10.2204/iodp.pr.310.2006

Expedition, Scientists

IODP Preliminary. Report, 310　2006/05
The last deglacial sea level rise in the South Pacific: offshore drilling in Tahiti (French Polynesia).doi:10.2204/iodp.sp.310.2005

Camoin, G.F, Iryu, Y, McInroy, D, the Expeditio, Project Team

IODP Scientifr Prospectus, 310　2005/12
地球をのぞくファイバースコープ—陸上掘削サイエンス・プラン

Iryu, Y

日本地球掘削科学コンソーシアム（J-DESC）　2005/11/30
IODPにおける我が国の科学戦略

伊藤久男, 井龍康文, 加藤憲二, 北里洋, 木村学, 多田隆治, 巽好幸, 長谷川卓, 山崎俊嗣

2004/03
Strategy for IODP Science Activity in Japan - Science Plans towards Realizing Drilling Proposals (1) -

Hasegawa, T, Ito H, Iryu, Y, Kato, K, Kimura, G, Kitazato, K, Tada, R, Tatsumi, Y, Yamazaki, T

2004/03
Holocene SSTs inferred from oxygen isotopic composition of fossil corals.

Yamada, T, Kobayashi, H, Asami, R, Iryu, I

Reports of the Fukuda Grant-in-aid for 2001　2001/09/30
3. アブ・シール遺跡建造物を構成する岩石の起源．早稲田大学古代エジプト学研究所編，アブ・シール南［I］

森啓, 井龍康文

2001/02
2. アブ・シール遺跡周辺の地質．早稲田大学古代エジプト学研究所編，アブ・シール南［I］

森啓, 井龍康文

2001/02
8th International Symposium on Fossil Cnidaria and Porifera, Field Trip A1.

Nakamori, T, Iryu, Y, Matsuda, S

Sasaki Printing & Publishing Co. Ltd., Sendai　1999/08
堆積学辞典岡田博有・相原安津夫・歌田實・青柳宏一・志岐常正・水野篤行編

井龍康文

1998/11
モネラ界速水格・森啓編古生物の科学1.古生物の総説・分類

井龍康文

朝倉書店　1998/09
北大東島試錐試料および表層試料に基づく堆積史の高精度解析．「平成８年度深田地質研究助成」研究報告

井龍康文, 稲垣静枝

深田地質研究所　1997/09
鴨島報告海底潜水調査．鴨島学術調査最終報告書−柿本人麿伝承と万寿地震津波−

Takayasu, K, Minoura, K, Iryu, Y, Yamada, T, Shinada, Y

鴨島伝承総合学術調査団　1995/10
Proceedings of the Ocean Drilling Program, Intial Reports, Volume 143.

Sager, W. W, Winterer, E. L, Firth, J. V

Ocean Drilling Program, Texas A & M University, Texas　1993/04
29th International Geological Congress Field Trip Guide Book Vol. 3

Kawana Toshio, Nakamori Toru, Matsuda Shinya, Iryu Yasufumi, Ujiié Hiroshi

Geological Survey of Japan　1992/10
サンゴ礁地域研究グループ編，日本のサンゴ礁地域１熱い自然サンゴ礁の環境誌

中森亨, 井龍康文

1990/09

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Presentations 325

炭酸塩貯留岩の地質情報解析における化学層序の有用性 Invited

高柳栄子, 石田圭史郎, 山本鋼志, 淺原良浩, 井龍康文

石油技術協会炭酸塩分科会　2017/11/08
Geochemistry of Miocene dolomites at the western Australian shelf margin: IODP Site 1464, Roebuck Basin

Yoshii, K, Takayanagi, H, Reuning, L, Ishikawa, T, Wakaki, S, Yamamoto, K, Iryu, Y

IODP Expedition 356 2nd Post-Cruise Meeting 2017　2017/07/17
Relationships between paleoceanographic changes and Australian monsoon variability during the Pleistocene

Sekine, N, Takayanagi, H, Groeneveld, J, Christensen, B. A, Bogus, K, Iryu, Y

IODP Expedition 356 2nd Post-Cruise Meeting 2017　2017/07/17
アラビア湾南岸に分布する上部ジュラ系〜下部白亜系炭酸塩岩の統合化学層序

矢野元康, 高柳栄子, 石田圭史郎, 山本鋼志, 淺原良浩, 井龍康文

平成29年度石油技術協会春季講演会　2017/06/14
アラビア湾南岸に分布する下部白亜系炭酸塩岩の堆積環境および年代

高柳栄子, 矢野元康, 石田圭史郎, 山本鋼志, 淺原良浩, 井龍康文

平成29年度石油技術協会春季講演会　2017/06/14
タイ国のペルム系より採取された腕足動物化石Tyloplecta yangtzeensis の地球化学

滝澤護, 佐藤晋佑a, Lapone Techapinyawat, 髙栁栄子, Thasinee Charoentitirat, 浅海竜司, 阿部理, 原英俊, 曽根正敏, 山本鋼志, 井龍康文

東北大学大学院理学研究科6専攻合同シンポジウム　2017/02/17
原水爆実験により生成された20 世紀の放射性炭素の濃度変化ーサンゴ骨格記録からの復元ー．

Andrews, A. H, 浅海竜司, 井龍康文, Kobayashi, D. R, Camacho, F

日本サンゴ礁学会第19回大会　2016/12/01
A causal link between paleoenvironmental dynamics and borehole instability issue in the Cenomanian carbonate reservoir, offshore Abu Dhabi. International-presentation

Yamamoto, K, Obara, H, Tsusaka, K, Tsuji, Y, Al-Farhan, Z. A, Aljneibi, M. M, Takayanagi, H, Kurita, H, Sato, T, Iryu, Y

Abu Dhabi International Petroleum Exhibition and Conference　2016/11/07
Geological and biogeographical evolution of the Ryukyu Islands.（国際シンポジウム"Geological and paleogeographical evolution of the Ryukyu Islands in the late Cenozoic"における講演）．

Iryu, Y

日本地質学会第123年学術大会　2016/09/10
アラビア湾南岸地域におけるバレミアン階炭酸塩岩の化学層序．

水島大輔, 高柳栄子, 石田圭史郎, 淺原良浩, 山本鋼志, 佐藤時幸, 井龍康文

日本地質学会第123年学術大会　2016/09/10
腕足動物化石の炭素・酸素同位体組成と殻の微細構造は続成作用の進行によってどのように変化するか

滝澤護, 佐藤晋佑, Lapone Techapinawat, 高柳栄子, Thasinee Charoentitirat, 浅海竜司, 阿部理, 原英俊, 曽根正敏, 山本鋼志, 井龍康文

日本地質学会第123年学術大会　2016/09/10
最終氷期の腕足動物殻化石を用いた中琉球の古環境復元．

滝澤護, 高柳栄子, 山本鋼志, 阿部理, 佐々木圭一, 井龍康文

日本古生物学会2016年会　2016/06/24
The evolution of the Great Barrier Reef over the past 30 ka – New insight from IODP Expedition 325. International-presentation

Webster, J. M, Braga, J. C, Humblet, M, Potts, D. C, Iryu, Y, Yokoyama, Y, Fujita, K, Bourillot, R, Esat, T. Z, Fallon, S, Thompson, W. G, Thomas, A. L, Kan, H, McGregor, H. V, Hinestrosa, G

13th International Coral Reef Symposium　2016/06/19
Bomb-produced radiocarbon in the western tropical Pacific Ocean—Guam coral reveals operation-specific signals from the Pacific Proving Grounds. International-presentation

Andrews, A. H, Asami, R, Iryu, Y, Kobayashi, D, Fučkar, N. S, Camacho, F

13th International Coral Reef Symposium　2016/06/19
ドロマイトの成因論に基づく高解像度貯留層キャラクタリゼーション－アブダビ沖巨大油田の事例－．

山本和幸, Gary Ottinger, Osama Al-Zinati, 高柳栄子, 山本鋼志, 井龍康文

平成28年度石油技術協会春季講演会　2016/06/08
アラビア湾南岸に分布するバレミアン階炭酸塩岩の炭素同位体層序．

水島大輔, 高柳栄子, 石田圭史郎, 淺原良浩, 山本鋼志, 佐藤時幸, 井龍康文

平成28年度石油技術協会春季講演会　2016/06/08
Effect of Holocene sea-level changes on intertidal ecosystems, southeastern Brazil. International-presentation

Spotorno-Oliveira, P, Tâmega, F. T. S, Oliveira, C. A, Castro, J. W. A, Coutinho, R, Iryu, Y, Bassi

Annual Meeting of the Italian Paleontological Society (Società Paleontologica Italiana)　2016/05/25
Changes in the Oligocene planktic foraminiferal depth habitat related to thermocline deepening in the eastern equatorial Pacific.

Matsui, H, Nishi, H, Takashima, R, Kuroyanagi, A, Ikehara, M, Takayanagi, H, Iryu, Y

日本地球惑星科学連合2016年大会　2016/05/22
The Cenozoic geohistory of the Ryukyu Islands and Taiwan. International-presentation

Iryu, Y

2016 Taiwan Geosciences Assembly (TGA)　2016/05/16
サンゴ骨格記録にみる琉球の海洋環境変動

浅海竜司, 玉城昭太, 村山雅史, 井龍康文

日本古生物学会第165 回例会　2016/01/29
Changes of Oligocene planktic foraminiferal depth habitat in the eastern equatorial Pacific （IODP Site U1334 and U1333） International-presentation

Matsui, H, Nishi, H, Takashima, R, Iryu, Y, Takayanagi, H, Ikehara, M

2015 AGU (American Geophysical Union) Fall Meeting　2015/12/14
Coral-based climatology: A case study in the Ryukyu Islands. International-presentation

Iryu, Y

Founding Symposium for the Institute for Space-Earth Environmental Research　2015/11/04
Factors limiting the use of skeletal carbonate isotopes as paleoenvironmental proxies.

Iryu, Y

2015 Fall Joint Conference of Geoloical Science of Korea　2015/10/28
The current research trends and activities of geology in Japan.

Iryu, Y

2015 Fall Joint Conference of Geoloical Science of Korea　2015/10/28
Bomb-produced radiocarbon in the western tropical Pacific Ocean - Guam coral reveals operationspecific signals from the Pacific Proving Grounds. International-presentation

Andrews, A. H, Asami, R, Iryu, Y, Fučkar, N. S, Camacho, F

ENVIRA2015　2015/09/21
アラブ首長国連邦アブダビ沖の巨大油田におけるバレミアン階炭酸塩プラットフォーム堆積物中のドロマイト層の成因と発達．

山本和幸, ゲイリー, オッティンガー, オサマアルジナティ, 高柳栄子, 山本鋼志, 井龍康文

日本地質学会第122年学術大会　2015/09/11
タイ国インドシナ地塊（ペルム系）より産出した腕足動物殻化石における炭素・酸素同位体組成の殻内変化および個体差．

滝澤護, Lapone Techapinawat, 髙栁栄子, Thasinee Charoentitirat, 浅海竜司, 阿部理, 原英俊, 曽根正敏, 山本鋼志, 井龍康文

日本地質学会第122年学術大会　2015/09/11
Paleoclimate records in a long-lived coral from Okinoerabu-jima, Ryukyu Islands. International-presentation

Asami, R, Tamashirom, S, Murayama, M, Iryu, Y

XIX INQUA Congress　2015/07/26
Response of the Great Barrier Reef to sea level and environmental changes over the past 30 ka. International-presentation

Webster, J. M, Braga, J. C, Humblet, M, Potts, D. C, Iryu, Y, Yokoyama, Y, Fujita, K, Bourillot, R, Esat, T. M, Fallon, S, Thompson, W. G, Thomas, A. L, Kan, H, McGregor, H. V, Hinestrosa, G

XIX INQUA Congress　2015/07/26
Ice sheet surge and 25 m rapid sea-level rise at Younger Dryas 13,000 years ago. International-presentation

Esat, T. M, Thomas, A. L, Yokoyama, Y, Webster, J. M, Braga, J. C, Humblet, M, Potts, D. C, Iryu, Y, Thompson, W. G, Fallon, S, Hinestrosa, G

XIX INQUA Congress　2015/07/26
Sea level record obtained from submerged the Great Barrier Reef coral reefs for the last 30 ka. International-presentation

Yokoyama, Y, Esat, T. M, Thompson, W. G, Thomas, A. L, Webster, J. M, Miyairi, Y, Sawada, C, Aze, T, Matsuzaki, H, Okuno, J, Fallon, S, Braga, J. C, Humblet, M, Iryu, Y, Potts, D. C, Fujita, K, Suzuki, A, Kan, H

XIX INQUA Congress　2015/07/26
掘削による地球環境研究、生物進化史研究の最前線

科学メディア意見交換会　2015/06/15
Origin and development of a stratiform dolomite in Barremian oil field carbonates, offshore Abu Dhabi, United Arab Emirates International-presentation

Yamamoto, K, Ottinger, G, Al-Zinati, O, Takayanagi , H, Yamamoto, K, Iryu, Y

AAPG Anual Convention & Exhibition 2015　2015/05/31
Origin and Development of a stratiform dolomite in Barremian oil field carbonates, offshore Abu Dhabi, United Arab Emirates International-presentation

Kazuyuki Yamamoto, Gary Ottinger, Osama Al-Zinati, Hideko Takayanagi, Koshi Yamamoto, Yasufumi Iryu

AAPG Annual Convention and Exhibition 2015　2015/05/31
Within- and inter-shell variations in carbon and oxygen isotope composition of modern brachiopods International-presentation

Takayanagi, H, Asami, R, Otake, T, Abe, O, Miyajima, T, Sasaki, K, Kitagawa, H, Iryu, Y

The 7th International Brachiopod Congress: The Brachiopod World　2015/05/23
PEPS の編集に関して 2014-2015 年の総括と2015-2017 年の展望

井龍康文

日本地球惑星科学連合連合大会 2015年大会　2015/05/22
Recent achievements and future perspectives of paleoenvironmental studies

井龍康文

日本地球惑星科学連合連合大会 2015年大会　2015/05/22
喜界島の上部更新統より産するKikaithyris hanzawai の炭素・酸素同位体組成および微量金属濃度の個体差

滝澤護, 髙栁栄子, 山本鋼志, 佐々木圭一, 井龍康文

日本地球惑星科学連合連合大会 2015年大会　2015/05/22
Last glacial to deglacial biotic changes on the Great Barrier Reef from offshore boreholes.

Humblet, M, Webster, J. M, Braga, J. C, Iryu, Y, Potts, D. C, Yokoyama, Y, Esat, T. M, Fallon, S, Thompson, W. G, Thomas, A. L

日本地球惑星科学連合連合大会 2015年大会　2015/05/22
北西太平洋における石灰藻球（Rhodolith）研究

加藤亜記, 馬場将輔, 松田伸也, 井龍康文

日本藻類学会第39回大会福岡2015　2015/03/20
喜界島湾層産のKikaithyris hanzawai（約70 ka）の炭素・酸素同位体組成による古海洋環境復元

滝澤護, 髙栁栄子, 山本鋼志, 佐々木圭一, 井龍康文

2014年度日本地質学会東北支部総会・講演会・シンポジウム　2015/03/07
化石Newhousia imbricata Kraft, G. W. Saunders, Abbott et Haroun の発見とその古生物学的意義

井龍康文

日本古生物学会第164 回例会　2015/01/30
「カンブリア紀の農耕革命」はエディアカラ紀に始まっていた

大路樹生, Stephen Q. Dornbos, 矢田圭吾, 長谷川精, Sersmaa Gonchigdorj, 望月貴史, 高柳栄子, 井龍康文

日本古生物学会第164 回例会　2015/01/30
腕足動物の同位体記録を歪める原因

高柳栄子, 浅海竜司, 大竹二雄, 阿部理, 宮島利宏, 北川浩之, 井龍康文

日本古生物学会第164 回例会　2015/01/30
石垣島の現生サンゴ骨格から復元された過去約500 年間の海洋環境変動

福留綾里紗, 浅海竜司, 阿部理, 高柳栄子, 平井彰, 井龍康文

日本古生物学会第164 回例会　2015/01/30
鉄同位体を利用した古海洋環境復元の試み．

田中啓, 安田友紀, 鈴木和博, 久保貴志, 申基澈, 高柳栄子, 井龍康文, 淺原良浩

2014 同位体環境学シンポジウム　2014/12/22
沖縄の第四紀地質

井龍康文

琉球大学熱帯生物圏研究センター主催研究集会「異分野間の相互理解を踏まえて再考する琉球列島の古地理」　2014/11/29
西部太平洋の掘削へ向けた新たな取り組み：Western Pacific Drilling（WEPAD）

板木拓也, WEPADワーキンググループ

日本地質学会第121年学術大会　2014/09/14
Geological significance of the mesophotic reef zone: example from the Sekisei Barrier Reef

Marc Humblet, Yasuo Furushima, Toshihiro Maki, Yasufumi Iryu

日本地質学会第121年学術大会　2014/09/14
中新世～鮮新世の琉球列島‘泥海（島尻層群）’における石灰質ナンノ化石に基づく年代層序学的・古海洋学的復元

今井遼, 佐藤時幸, 井龍康文

日本地質学会第121年学術大会　2014/09/14
琉球列島多良間島に分布する琉球層群の層序および年代

大関萌, 今井遼, 高柳栄子, 井龍康文

日本地質学会第121年学術大会　2014/09/14
アラビア湾南岸地域におけるアプチアン階石油根源岩の形成要因と海洋無酸素事変（OAE1a）との関連性

山本和幸, 石橋正敏, 高柳栄子, 浅原良浩, 佐藤時幸, 西弘嗣, 井龍康文

日本地質学会第121年学術大会　2014/09/14
Preservation of ichnocoenosis in present-day macroid, algal nodule and rhodolith beds (S. Japan, E. Australia, S. Spain): Palaeoecological inferences International-presentation

Bassi, D, Braga, J. C, Iryu, Y, Takayanagi, H

The 7th International Meeting on Taphonomy and Fossilization　2014/09/10
第四紀に琉球列島で何が起きたのか？

60周年記念深田研究助成講演会　2014/09/05
A newly identified positive excursion of 87Sr/86Sr ratio in the Lower Aptian platform carbonates offshore Abu Dhabi, UAE: Is it a local or global signature of Ocean Anoxic Event 1a? International-presentation

Yamamoto, K, Ishibashi, M, Takayanagi, H, Asahara, Y, Sato, T, Nishi, H, Iryu, Y

The 2nd International Symposium of IGCP 608 “Cretaceous Ecosystems and Their Responses to Paleoenvironmental Changes in Asia and the Western Pacific“　2014/09/04
Late Holocene reef development in French Polynesia International-presentation

Hallmann, N, Camoin, G, Eisenhauer, A, Vella, C, Samankassou, E, Botella, A, Milne, G.A, Fietzke, J, Dussouillez, P, Plaine, J, Iryu, Y

19th International Sedimentological Congress　2014/08/18
Recent progress of continental scientific drilling in Japan International-presentation

SinoProbe workshop for experts and abreoad　2014/08/10
赤道太平洋IODP Exp.320/321における漸新世以降の浮遊性有孔虫群集と酸素・炭素同位体比

松井浩紀, 西弘嗣, 高嶋礼詩, 井龍康文, 高柳栄子

日本古生物学会2014年年会　2014/06/27
Skeletal records in a long-lived Porites coral from Okinoerabu-jima, Ryukyu Islands

Asami, R, Tamashiro, S, Tsuchiya, M, Kawakami, S, Murayama, M, Iryu, Y

日本地球惑星科学連合連合大会 2014年大会　2014/04/28
Ocean acidification in the tropical Northwest Pacific since the mid-20th century reconstructed from coral boron isotope

Shinjo, R, Asami, R, Huang, K.-f, YOU, C.-f, Iryu, Y

日本地球惑星科学連合連合大会 2014年大会　2014/04/28
石灰質ナンノ化石からみた中新世～鮮新世の琉球列島の古海洋環境

今井遼, 佐藤時幸, 井龍康文

日本地球惑星科学連合連合大会 2014年大会　2014/04/28
石灰質ナンノ化石群集からみた北西太平洋および東インド洋における後期新生代の古海洋変動

今井遼, 佐藤時幸, 井龍康文

第7回6専攻合同シンポジウム　2014/02/20
石灰質ナンノ化石からみた後期新生代の北西太平洋および東インド洋の古海洋変動

今井遼, 佐藤時幸, 井龍康文

日本古生物学会第163回例会　2014/01/24
ヒレナシジャコの殻の酸素同位体組成を用いた海水温復元の信頼性および問題点

山梨純平, 高柳栄子, 伊佐地彩加, 浅海竜司, 井龍康文

日本古生物学会第163回例会　2014/01/24
Newly found submerged reefs on the Miyako-Sone platform, Ryukyu Arc, northwestern Pacific International-presentation

Araia, K, Matsuda, H, Sasakic, K, Machiyama, H, Inoue, T, Iryu, Y

AGU Fall Meeting　2013/12/09
国際陸上科学計画としてのJBBPへの期待

井龍康文

日本地熱学会　2013/11/09
J-DESC陸上掘削部会がANDRILLに期待するもの

井龍康文

ANDRILL参加に向けた国内準備集会　2013/10/11
サンゴ礁掘削

井龍康文

ICDP次期10年科学計画策定会議@ドイツに向けた国内ワークショップ　2013/09/21
Vocontian堆積盆地における下部－上部白亜系境界付近の放散虫化石層序

白井孝明, 鈴木紀毅, 高嶋礼詩, 西弘嗣, 井龍康文, 小川草平, 高柳栄子

日本地質学会第120年学術大会　2013/09/14
石灰質ナンノ化石からみた多良間島に分布する多良間砂層の地質年代

今井遼, 大関萌, 井龍康文

日本地質学会第120年学術大会　2013/09/14
フランス・Vocontian Basin Sequenceと北海道・蝦夷層群の浮遊性有孔虫化石・炭素同位体比統合層序とU-Pb年代による白亜系標準年代層序の樹立

西弘嗣, 高嶋礼詩, 折橋裕二, 山中寿朗, 井龍康文, 高柳栄子, 林圭一

日本地質学会第120年学術大会　2013/09/14
フランス南東部Vocontian堆積盆地における白亜紀中期・海洋無酸素事変1bの高解像度解析

小川草平, 高嶋礼詩, 西弘嗣, 井龍康文, 高柳栄子

日本地質学会第120年学術大会　2013/09/14
沖縄県宮古島北東沖・宮古曽根プラットフォームの形成史

荒井晃作, 松田博貴, 井上卓彦, 佐藤時幸, 山崎誠, 町山栄章, 佐々木圭一, 井龍康文

日本地質学会第120年学術大会　2013/09/14
石灰質ナンノ化石群集に基づく中新世～鮮新世の琉球列島“泥海(島尻層群）” の年代層序学的・古海洋学的復元

今井遼, 佐藤時幸, 井龍康文

日本古生物学会2013年年会・総会　2013/06/28
Fossil semi-endophytic species of Lithophyllum (Corallinaceae, Rhodophyta) from Tahiti

Yasufumi Iryu, William J. Woelkerling, Davide Bassi

日本古生物学会2013年年会・総会　2013/06/28
Le Prime Alghe Rosse Corallinacee Semi-endorite Fossili: Ricerche Dell'IODP a Tahiti, Polinesia Francese International-presentation

Bassi, D, Iryu, Y, Woelkerling, W. J

XIII Giornate Di Paleontologia　2013/05/23
石灰質ナンノ化石群集に基づく後期新生代の北西太平洋および東インド洋の古海洋復元

今井遼, 佐藤時幸, 井龍康文

日本地球惑星科学連合連合大会 2013年大会　2013/05/19
ICDP（国際陸上科学掘削計画）の足跡と今後の展開

井龍康文

２１世紀の人間活動と資源，環境に関連した地球科学に関するシンポジウム　2013/05/17
石垣島の現生サンゴから得られた過去約500年間の骨格年輪記録

浅海竜司, 阿部理, 高柳栄子, 平井彰, 森本真紀, 井龍康文

日本海洋学会2013年春季大会　2013/03/22
宮古島北東沖に見つかった沈水サンゴ礁

荒井晃作, 松田博貴, 町山栄章, 佐々木圭一, 山口毅, 井龍康文, 井上卓彦

炭酸塩コロキウム　2013/03/15
Introduction of Japan Drilling Earth Science Consortium (J-DESC) Continental Drilling Section, Japan Beyond-Brittle Project (JBBP) International-presentation

Scientific drilling to demonstrate a feasibility of the engineered geothermal system in ductile zones　2013/03/12
礁／炭酸塩プラットフォーム堆積物の掘削試料が明らかにする地球環境変動

井龍康文

「地学雑誌特集号：陸上掘削科学の新展開」出版記念シンポジウム　2013/02/23
石灰質ナンノ化石群集に基づく中新世〜鮮新世の琉球列島“泥海（島尻層郡）”の年代層序学的・古海洋学的復元

今井遼, 佐藤時幸, 井龍康文

東京大学大気海洋研究所研究集会2012年度古海洋シンポジウム　2013/01/07
タヒチ島の後氷期サンゴ礁堆積物から発見された無節サンゴモの新種

井龍康文, Worlkerling, W, Bassi, D

日本サンゴ礁学会第15回大会　2012/11/22
Mesophotic Montipora from Kikai-jima

Humblet, M, Matsuda, H, Sasaki, K, Machiyama, H, Iryu, Y

日本サンゴ礁学会第15回大会　2012/11/22
Geological significance of mesophotic coral reef ecosystems

Humblet, M, Iryu, Y

日本サンゴ礁学会第15回大会　2012/11/22
腕足動物ー古海洋環境復元に使える部分，使えない部分

井龍康文

PALEO学会発足シンポジウム　2012/11/09
腕足動物ー古海洋環境復元に使える部分，使えない部分

高柳栄子, 山本鋼志, 浅海竜司, 大竹二雄, 宮島利宏, 阿部理, 井龍康文

東京大学大気海洋研究所共同利用研究集会バイオミネラリゼーションと石灰化 –遺伝子から地球環境まで–　2012/11/08
Integrated stratigraphic correlation of the Upper Albian-Lower Cenoma-nian successions between Japan and France International-presentation

Takashima, R, Nishi, H, Yamanaka, T, Iryu, Y, Takayanagi, H, Quidelleur, X, Latil, G.-L, Hayashi, K, Koyasu, H, Ogawa, S

G-COE Symposium 2012, Achievements of G-COE Program for Earth and Planetary Dynamics　2012/09/27
Palaeobathymetric significance of coralline algae in LGM and postglacial deposits in the Great Barrier Reef International-presentation

Braga, J. C, Iryu, Y, Webster, J. M, Yokoyama, Y, IODP Expeditio, Scientists

IV International Rhodolith Workshop　2012/09/17
アラブ首長国連邦アブダビ沖の前期アプチアン炭酸塩岩コア試料に記録された海洋無酸素事変（OAE1a）時におけるグローバル炭素循環と古海洋環境変遷

山本和幸, 石橋正敏, 高柳栄子, 浅原良浩, 佐藤時幸, 西弘嗣, 井龍康文

日本地質学会第119年学術大会　2012/09/15
日本とフランスにおける白亜系Albian/Cenomanian境界の対比

高嶋礼詩, 西弘嗣, 山中寿朗, 井龍康文, 高柳栄子

日本地質学会第119年学術大会　2012/09/15
鹿児島県トカラ列島小宝島東方沖陸棚上の礁岩の堆積学的特徴とその年代

松田博貴, 荒井晃作, 井上卓彦, 町山栄章, 佐々木圭一, 井龍康文, 佐藤時幸, 山崎誠

日本地質学会第119年学術大会　2012/09/15
Philippine Sea Plate Motion Since Eocene Estimated From Paleomagnetism of Seafloor Drill Cores and Gravity Cores International-presentation

Yamazaki, T, Takahashi, M, Iryu, Y, Sato, T, Oda, M, Takayanagi, H, Chiyonobu, S, Nishimura, A, Nakazawa, T, Ooka, T

AOGS-AGU (WPGM) Joint Assembly　2012/08/13
Daily growth increments of tridacnid shells as paleoevnvironmental proxies International-presentation

Isaji, A, Asami, R, Takayanagi, H, Iryu, Y

12th International Coral Reef Symposium　2012/07/09
Variations in coral assemblages since the LGM: IODP Expedition 325 “Great Barrier Reef Environmental Changes” International-presentation

Humblet, M, Potts, D, Webster, J, IODP Expeditio, scientists

12th International Coral Reef Symposium　2012/07/09
Penultimate glacial tropical Pacific sea surface temperatures from Tahiti corals International-presentation

Asami, R, Felis, T, Deschamps, P, Thomas, A, Bard, E, Durand, N, Murayama, M, Iryu, Y

12th International Coral Reef Symposium　2012/07/09
IODP Expedition 325 to the Great Barrier Reef: unlocking the history of reef growth and demise since the Last Glacial Maximum International-presentation

Webster, J. M, Braga, J. C, Humblet, M, Potts, D, Iryu, Y, Hinestrosa, G, Bourillot, R, Seard, C, Camoin, G, Yokoyama, Y, Thomas, A, Thompson, B, Esat, T, Fallon, S, Dutton, A, Expedition, Scientists

12th International Coral Reef Symposium　2012/07/09
U-series geochronology for the Last Glacial Maximum Great Barrier Reef International-presentation

Thompson, W. G, Esat, T. M, Thomas, A, Yokoyama, Y, Webster, J. B, Expedition, Scientists

12th International Coral Reef Symposium　2012/07/09
Late Quaternary upper-slope deepening (fining) upward sequences International-presentation

Harper, B. B, Droxler, A. W, Gischler, E, Webster, J. B, Bernabéu, À. P, Expedition, Scientists

12th International Coral Reef Symposium　2012/07/09
Verification of paleodepth and island subsidence estimates, using imperfect U-Th data International-presentation

Thomas, A, Expedition, Scientists

12th International Coral Reef Symposium　2012/07/09
Palaeobathymetric significance of coralline algae in LGM and postglacial deposits in the Great Barrier Reef, NE Australia International-presentation

Braga, J. C, Iryu, Y, Webster, J. M, Yokoyama, Y, Potts, D. C, Humblet, M

12th International Coral Reef Symposium　2012/07/09
伊勢湾・三河湾における現生底生有孔虫群集の多様性と類似性

横井大作, 阿部理, 井龍康文

日本古生物学会2012年年会・総会　2012/06/29
どうすれば，腕足動物殻の炭素・酸素同位体組成および微量金属元素濃度から正確に顕生代の環境変動を描き出せるのか？

高柳栄子, 井龍康文

日本古生物学会2012年年会・総会　2012/06/29
Macroidi attuali della piattaforma di Kikai-Jima, Isole Ryukyu centrali International-presentation

Bassi, D, Iryu, Y, Humblet, M, Matsuda, H, Machiyama, H, Sasaki, K, Matsuda, S, Arai, K, Inoue, T

Giappone, Giornate di Paleontologia XII Edizione　2012/05/24
Icnocenosi in rodoliti non tropical: Fraser Island, Australia orientale International-presentation

Bassi, D, Iryu, Y, Braga, J. C, Takayanagi, H, Tsuji, Y

Giornate di Paleontologia XII Edizione　2012/05/24
北大東島における過去2,500万年間の堆積・続成史

井龍康文, 高柳栄子, 石川剛志, 永石一弥, 中山裕樹

日本地球惑星科学連合連合大会 2012年大会　2012/05/20
Fossil large benthic foraminiferal assemblages from sediment cores drilled on shelf slopes of the Great Barrier Reef, Australia: IODP Expedition 325

Yagioka, N, Nakada, C, Fujita, K, Kan, H, Yokoyama, Y, IODP Ex, scientists

日本地球惑星科学連合連合大会 2012年大会　2012/05/20
Selected scientific results of the IODP Expedition 310 "Tahiti Sea Level" International-presentation

Iryu, Y, Kodama, K

2012 Kochi International Workshop II "Paleoceanography of the northwestern Pacific margin - A new proposal to IODP -"　2012/03/21
粟国島沖（606m）より採取された現生腕足動物の殻の炭素・酸素同位体組成

高柳栄子, 浅海竜司, 阿部理, 宮島利宏, 北川浩之, 井龍康文

東京大学大気海洋研究所共同利用研究集会バイオミネラリゼーションと石灰化 –遺伝子から地球環境まで–　2011/11/18
シャコガイの成長輪に記録される環境因子

伊佐地彩加, 浅海竜司, 高柳栄子, 井龍康文

東京大学大気海洋研究所共同利用研究集会バイオミネラリゼーションと石灰化 –遺伝子から地球環境まで–　2011/11/18
シャコガイの成長輪は何を記録しているのか

伊佐地彩加, 浅海竜司, 高柳栄子, 井龍康文

日本サンゴ礁学会第14回大会　2011/11/03
サンゴ礁のなりたち

井龍康文

日本サンゴ礁学会第14回大会　2011/11/03
サンゴ骨格中のプルトニウムの起源

P. Lindahl, 浅海竜司, 井龍康文, P. Worsfold, M. Keith-Roach, M.-S. Choi

日本サンゴ礁学会第14回大会　2011/11/03
琉球層群の堆積史近年の研究成果に関するレビューと展望

井龍康文

東京大学大気海洋研究所共同利用研究集会東シナ海および琉球弧の地史と古環境　2011/10/03
浅海性炭酸塩堆積物に基づく氷期における琉球列島北部の海洋環境ー氷期にサンゴ礁はあったのか？ー

松田博貴, 町山栄章, 荒井晃作, 井上卓彦, 佐々木圭一, 吉津憲, 三納正美, 井龍康文, 杉原薫, 藤田和彦, 山田努, 中森亨

東京大学大気海洋研究所共同利用研究集会東シナ海および琉球弧の地史と古環境　2011/10/03
鹿児島県トカラ列島小宝島東方沖陸棚上での礁岩の発見とその意義

松田博貴, 荒井晃作, 井上卓彦, 町山栄章, 吉津憲, 三納正美, 堺理紗子, 佐々木圭一, 井龍康文, 中森亨, 山田努, 藤田和彦, 杉原薫

日本地質学会第118年学術大会　2011/09/09
タヒチ島における最終融氷期の造礁生物群集の時空変化：統合国際深海掘削計画第310次航海「タヒチ島の海水準」の成果

井龍康文, 杉原薫, Elizabeth Abbey・, Jody M. Webster・Juan C. Braga, Carden Wallace・Donald Potts・Terry Done・Gilbert Camoin・Claire Seard

日本古生物学会2011 年年会・総会　2011/07/01
Rhodolith beds from the Abrolhos Bank, Brazilian platform: taphonomy, geochemistry, ecology

Davide Bassi, Rachel N. Leal, Hideko Takayanagi, Yasufumi Iryu, Renato Posenato, Gilberto M, Amado-Filho

TAPHOS 2011, 6th International Meeting on Taphonomy and Fossilization　2011/06/14
Macroid growth off Kikai-jima (Ryukyu Islands, southern Japan) and its taphonomic characterization

Davide Bassi, Marc Humblet, Yasufumi Iryu, Senji Matsuda

TAPHOS 2011, 6th International Meeting on Taphonomy and Fossilization　2011/06/14
Sources of plutonium to the tropical Northwest Pacific Ocean since the mid-20th century: a natural coral archive

Patric Lindahl, Ryuji Asami∗, Yasufumi Iryu, Paul Worsfold, Miranda Keith-Roach, Min-Seok Choi

日本地球惑星科学連合連合大会 2011年大会　2011/05/22
タヒチ島における最終後氷期の海水準変動，気候変動，サンゴ礁形成

井龍康文, Gilbert Camoin

日本地球惑星科学連合連合大会 2011年大会　2011/05/22
Intraspecific variations in carbon and oxygen isotope compositions of the modern brachiopod (Basiliola lucida) shells collected off Okinawa-jima and Amami-o-shima, southwestern Japan

Takayanagi, H, Asami, R, Otake, F, Abe, O, Kitagawa, H, Iryu, Y

日本地球惑星科学連合連合大会 2011年大会　2011/05/22
Tropical South Pacific Climate Variability Inferred from Tahiti Fossil Corals: IODP Expedition 310 -Tahiti Sea Level-

Ryuji Asami, Thomas Felis, Pierre Deschamps, Kimio Hanawa, Yasufumi Iryu, Edouard Bard, Nicolas Durand, Masafumi MURAYAMA

日本地球惑星科学連合連合大会 2011年大会　2011/05/22
サンゴのホウ素同位体組成から復元される北西太平洋熱帯表層の pH 変動

新城竜一, 浅海竜司, K.-F. Huang, C.-F. You, 井龍康文

日本地球惑星科学連合連合大会 2011年大会　2011/05/22
沖縄本島南部玉泉洞の石筍を用いた陸域古環境復元

浅海竜司, 植村立, 山川周作, 南舞依香, 高柳栄子, 井龍康文

日本地球惑星科学連合連合大会 2011年大会　2011/05/22
腕足動物殻の炭素・酸素同位体組成はどの程度正確な古環境指標となりうるのか？ーTerebratulina crosseiを例にしてー

高柳栄子, 浅海竜司, 大竹二雄, 阿部理, 北川浩之, 井龍康文

東京大学大気海洋研究所共同利用研究集会バイオミネラリゼーションと石灰化 –遺伝子から地球環境まで–　2011/02/10
サンゴ骨格のプルトニウムはどこからきたのか

Patric Lindahl, 浅海竜司, 井龍康文, Paul Worsfold ・Miranda Keith-Roach・Choi Min-Seok

日本古生物学会第160回例会　2011/01/28
腕足動物Terebratulina crosseiはどの程度正確に海洋環境を記録しているか？

高柳栄子, 浅海竜司, 大竹二雄, 阿部理, 北川浩之, 井龍康文

日本古生物学会第160回例会　2011/01/28
Halimeda-dominated deposits on submerged seamounts in the northern Philippine Sea. International-presentation

Takayanagi, H, Oda, M, Sato, T, Chiyonobu, S, Nishimura, A, Nakazawa, T, Shiokawa, S

9th International Symposium on Fossil Algae　2007/09/19
A coral-based reconstruction of the northwestern tropical Pacific climate over the last ~200 years. International-presentation

Asami, R, Yamada, T, Hanawa, K

EASTEC symposium 2007 "Dynamic Earth -its origin and future-"　2007/09/18
Annual record of environmental history in corals and tree-rings – a land-sea correlation at Ogasawara Islands, Japan. International-presentation

Kazmer, M, Sho, K, Oka, S, Sugimoto, O, Asami, R, Yamada, T

The 1st Asian Dendrochronology Conference and Workshop　2007/09/09
ニウエ島のサンゴ化石の骨格記録から推定される約20万年前の南太平洋の海洋環境．

浅海竜司, 山田努, G. Paulay, 三輪貴志

日本地質学会第114年学術大会　2007/09/09
北西太平洋の海山から採取されたHalimeda 石灰岩

高柳栄子, 尾田太良, 佐藤時幸, 千代延俊, 西村昭, 中澤努, 塩川智

日本地質学会第114年学術大会　2007/09/09
北西太平洋の海山から採取された炭酸塩岩の堆積相および年代

高柳栄子, 山田努, 尾田太良, 佐藤時幸, 千代延俊, 西村昭, 中澤努, 塩川智

日本地質学会第114年学術大会　2007/09/09
IODP Expedition 310タヒチ沖における微生物岩の産状と初期続成作用

松田博貴, 山田努, 町山栄章, Camoin G. F, McInroy, D. B, Expedition, Scientists

日本地質学会第114年学術大会　2007/09/09
大槌湾（岩手県）で採取された腕足動物（Terebratulina crossei, Terebratalia coreanica）殻の炭素・酸素同位体比記録

山本和幸

三陸の海：その魅力と生物学（東京大学海洋研究所国際沿岸海洋研究センター研究集会）　2007/08/20
海底下・地底下に地球の歴史を探る

東北大学１００周年記念青葉山サイエンス・サマースクール（公開サイエンス講座）　2007/08/20
Carbonate deposits on submerged seamounts in the northwestern Pacific. International-presentation

Takayanagi, H, Yamada, T, Oda, M, Sato, T, Chiyonobu, S, Nishimura, A, Nakazawa, T, Shiokawa, S

10th International Symposium on Fossil Cnidaria and Porifera　2007/08/12
Community structure of hermatypic corals in a Late Miocene atoll: Kita-daito-jima, northern Philippine Sea. International-presentation

Ikeda, E., Y, Humblet, M

10th International Symposium on Fossil Cnidaria and Porifera　2007/08/12
“ODP and IODP contributions to reef studies”

石油産業におけるIODP（統合国際深海掘削計画）の活用に関するワークショップ　2007/07/26
深海掘削計画史上初のサンゴ礁における浅層多孔掘削 -IODP第 310次航海「Tahiti Sea Level」の成果

第3回IODP成果報告会　2007/05/25
COREFプロジェクト -第四紀気候変動に対するサンゴ礁の応答の解明を目指して-

第2回陸上掘削研究に関する情報交換会　2007/05/22
Evaluation of carbon and oxygen isotopic compositions of modern brachiopod shells as paleoenvironmental proxies.

Yamamoto, K

Japan Geoscience Meeting 2007　2007/05/14
Microbialite-dominated coral reefs as response to abrupt environmental changes during the last deglacial sea-level rise. IODP Expedition #310, Tahiti. International-presentation

Heindel, K, Westphal, H, Camoin, G, Seard, C, Birgel, D, Peckmann, J, IODP Expeditio, Scientists

European Geosciences Union, General Assembly　2007/04/15
Sea-level rise, climatic changes and reef development during the last deglaciation. Preliminary results from the IODP Expedition 310 "Tahiti Sea Level". International-presentation

Camoin G, McInroy D, Expedition, Scientists

European Geosciences Union, General Assembly　2007/04/15
Microbialites: a major component of the last deglacial reef sequence from Tahiti. Environmental significance and sedimentological roles. International-presentation

Camoin, G, Westphal, H, Séard, C, Heindel, K, Yokoyama, Y, Matsuzaki, H, Webster, J, Expedition, Scientists

European Geosciences Union, General Assembly　2007/04/15
Sub-seasonal reconstructions of South Pacific climate during the last deglaciation from Tahiti corals - Preliminary results from IODP Expedition 310. International-presentation

Felis, T, Asami, R, Deschamps, P, Kölling, M, Durand, N, Bard, E, IODP Expeditio, Scientists

European Geosciences Union, General Assembly　2007/04/15
New evidence for the existence of the MWP-1A from a “far-field” site - Preliminary results from the Tahiti IODP Expedition 310. International-presentation

Deschamps, P, Durand, N, Bard, E, Hamelin, B, Camoin, G, Thomas, A. L, Henderson, G. M, Yokoyama, Y, IODP Expeditio, Scientists

European Geosciences Union, General Assembly　2007/04/15
高精度地震破断面記録に基づく奄美北方海域における第四紀炭酸塩堆積物

松田博貴, 荒井晃作, 町山栄章, 辻善弘

日本堆積学会2007年大会（例会・総会）　2007/03/27
Sub-seasonal reconstructions of South Pacific climate during the last deglaciation from Tahiti corals - Preliminary results from IODP Expedition 310. International-presentation

Felis, T, Asami, R, Deschamps, P, Kölling, M, Durand, N, Bard, E, IODP Expeditio, Scientists

The Annual National German ICDP/IODP Meeting in Potsdam　2007/03/19
South Pacific seasonality during the last deglaciation reconstructed from fossil Tahiti corals using Laser Ablation ICP-MS: Initial results from IODP Expedition 310. International-presentation

Hathorne, E. C, IODP Expeditio, Scientists

The Annual National German ICDP/IODP Meeting in Potsdam　2007/03/19
Biogenic carbonates and limestones as proxies for paleoenvironments. International-presentation

Young Brains 21 Program “Frontier of Crystal Growth Science -Trigger to a breakthrough of calcium carbonate research” -　2007/02/20
Geochemical evidence from long-lived massive Porites corals for the last 2 centuries. International-presentation

Asami, R, Yamada, T, Hanawa, K, Quinn, T. M

The 1st International Workshop on the COREF Project　2007/01/15
Humblet, M. International-presentation

Pleistocene coral community, structure of the, Ryukyu Islands

The 1st International Workshop on the COREF Project　2007/01/15
Introduction of the COREF Project. International-presentation

Matsuda, H

The 1st International Workshop on the COREF Project　2007/01/15
Geological background of the Ryukyu Island Arc. International-presentation

The 1st International Workshop on the COREF Project　2007/01/15
Proposal of drilling sites for ICDP. International-presentation

The 1st International Workshop on the COREF Project　2007/01/15
Atoll history of Kita-daito-jima (northern Philippine Sea) for the last 25 million years

Inagaki, S, Suzuki, Y, Yamada, T

A Symposium on Carbonate Diagenesis and Sedimentation on Reefs and Carbonate Platforms　2006/11/26
Carbonate deposits on submerged seamounts in the northwestern Pacific

Takayanagi, H, Yamada, T, Oda, M, Sato, T, Nishimura, A, Nakazawa, T, Shiokawa, S

A Symposium on Carbonate Diagenesis and Sedimentation on Reefs and Carbonate Platforms　2006/11/26
過去数百年間の古海洋環境－巨大サンゴの骨格記録からの復元－

浅海竜司, 山田努, 花輪公雄

日本サンゴ礁学会第９回大会　2006/11/24
Responses of Pleistocene coral communities to sea-level changes in the Ryukyu Islands

Humblet, M

9th Annual Meeting of the Japanese Coral Reef Society　2006/11/24
Niue島産の化石Poritesの炭素・酸素同位体比記録

山田努, 浅海竜司, Gustav Paulay

日本サンゴ礁学会第９回大会　2006/11/24
70年前に掘られたボーリング試料が語る北大東島の2,500万年間の歩み

日本サンゴ礁学会第９回大会　2006/11/24
Climatic and oceanographic records detected from northwestern tropical Pacific corals over the last several centuries. International-presentation

Asami, R, Yamada, T, Hanawa, K

International Symposium on "Climate Change: Past and Future"　2006/11/06
Variations of Pleistocene coral community structure in response to sea level change in the Ryukyu Islands. International-presentation

Humblet M

International Symposium on "Climate Change: Past and Future"　2006/11/06
Toward the reconstruction of dynamic response of coral reefs to Quaternary climatic changes- an introductory perspective on the COREF Project. International-presentation

Matsuda, H, Machiyama, H, Piller, W. E, Quinn, T. M, Mutti, M

International Symposium on "Climate Change: Past and Future"　2006/11/06
Paleo-solar radiation retrieved from daily growth increments of tridacnid shells. International-presentation

Yamada, T, Henmi, S, Asami, R

International Symposium on "Climate Change: Past and Future"　2006/11/06
Preservation of primary isotopic signatures in fossil brachiopod shells: a reliable proxy of paleoceanography? International-presentation

Yamamoto, K, Yamada, T

International Symposium on "Climate Change: Past and Future"　2006/11/06
Giant clams: new climate archives International-presentation

Lazareth, C. E, Elliot, M, Le Cornec, F, Cabioch, G, Lasne, G, Yamada, T, McCulloch, M, Goiran, C

Coral Reef Ecosystem Biodiversity Forum　2006/10/30
The IODP Expedition 310 "Tahiti Sea Level": The last deglacial sea-level rise in the South Pacific

Camoin, G, Expedition, Scientists

12th Formation Evaluation Symposium of Japan　2006/10/04
Holocene relative sea-level change and tectonic uplift deduced from warm temperate limestone at Muroto-misaki, Shikoku, Japan. International-presentation

Maemoku, H, Yamada, T, Maeda, Y

SEALAIX’06 (Seal Level Changes: Records, Process and Modeling)　2006/09/25
The IODP Expedition 310 "Tahiti Sea Level": Sea-level changes and reef development during the last deglaciation. International-presentation

Camoin, G, Expedition, Scientists

SEALAIX’06 (Seal Level Changes: Records, Process and Modeling)　2006/09/25
Variations of Pleistocene coral community structure in response to sea level change in the Ryukyu Islands. International-presentation

Humblet, M

SEALAIX’06 (Seal Level Changes: Records, Process and Modeling)　2006/09/25
Sea-level changes recorded in Pleistocene coral reef deposits on islands off the Katsuren Peninsula, southern Okinawa-jima, Ryukyu Islands, southwestern Japan. International-presentation

Oshimizu, T

SEALAIX’06 (Seal Level Changes: Records, Process and Modeling)　2006/09/25
Contrasts of coral zonation between Ishigaki Island (Japan, northwestern Pacific) and Tahiti Island (French Polynesia, central Pacific), and its significance in Quaternary reef growth histories. International-presentation

Sugihara, S, Yamada, T

SEALAIX’06 (Seal Level Changes: Records, Process and Modeling)　2006/09/25
Responses of Quaternary coral reefs in the Ryukyus (SW Japan) to combined effects of subsidence and glacioeustasy. International-presentation

Yamamoto, K, Takeuchi, T, Sato, T, Chiyonobu S, Sagae, K

SEALAIX’06 (Seal Level Changes: Records, Process and Modeling)　2006/09/25
Extending the Tahiti post-glacial sea-level record with offshore drilled corals. First results from IODP Expedition 310 International-presentation

Deschamps, P, Durand, N, Bard, E, Hamelin, B, Camoin, G, Thomas, A. L, Henderson, G. M, Yokoyama, Y, IODP Expeditio, Scientists

SEALAIX’06 (Seal Level Changes: Records, Process and Modeling)　2006/09/25
Preliminary results from the IODP Expedition 310 “Tahiti Sea Level”: U-Th dating of Pleistocene reef material International-presentation

Thomas, A. L, Henderson, G. M, Deschamps, P, Bard, E, Hamelin, B, Camoin, G, IODP Expeditio, Scientists

SEALAIX’06 (Seal Level Changes: Records, Process and Modeling)　2006/09/25
Reef response to last deglacial rapid sea-level rise: the microbialite question (IODP Expedition #310) International-presentation

Westphal, H, Camoin, G, Peckmann, J, Heindel, K, Seard, C, Eisenhauer, A, IODP Expeditio, Scientists

SEALAIX’06 (Seal Level Changes: Records, Process and Modeling)　2006/09/25
High-resolution skeletal records from a western Pacific coral and their relationships to environmental variables International-presentation

Asami, R, Yamada, T, Hiejima, T

6th International Society for Reef Studies European Meeting　2006/09/19
Annual growth increments in corals and tree-rings? comparing records from the same location: Ogasawara (Bonin) Islands, Japan- International-presentation

Kazmer, M, Sho, K, Sugimoto, O, Yamada, T, Asami, R

6th International Society for Reef Studies European Meeting　2006/09/19
IODP Expedition 310 'Tahiti Sea Level'の概要

浅海竜司, Gilbert Camoin, 統合国際深海掘削計, 次航海乗船研究者一同

日本地質学会第113年学術大会　2006/09/16
フィリピン海の堆積岩および化石の検討と今後の課題

西村昭, 秋葉文雄

日本地質学会第113年学術大会　2006/09/16
北西太平洋の海山から採取された炭酸塩岩の堆積学的研究

高柳栄子, 山田努, 尾田太良, 佐藤時幸, 西村昭, 中澤努, 塩川智

日本地質学会第113年学術大会　2006/09/16
琉球列島におけるサンゴ礁の成立と発達過程

山本和幸, 佐藤時幸, 千代延俊, 寒河江健一, 阿部栄一

日本地質学会第113年学術大会　2006/09/16
When did the “coral sea” form in the Ryukyus? International-presentation

Oshimizu, T, Yamada, T, Sato, T

17th International Sedimentological Congress　2006/08/27
Present-day and fossil rhodolith pavements compared: palaeoenvironmental tools in analysing shallow-water carbonate deposits. International-presentation

Bassi, D, Checconi, A, Hohenegger, J, Nebelsick, J.H

17th International Sedimentological Congress　2006/08/27
New proxy for paleo-solar radiation using daily growth increments of tridacnid shells. International-presentation

Yamada, T, Henmi, S, Asami, R

17th International Sedimentological Congress　2006/08/27
Geochemical records of massive coral skeletons in the northwestern equatorial Pacific: a proxy for paleoclimatic variability relating to migration of the Western Pacific Warm Pool. International-presentation

Asami, R, Yamada, T, Hiejima, T

17th International Sedimentological Congress　2006/08/27
Variations of Pleistocene coral community structure in response to sea level change in the Ryukyu Islands. International-presentation

Humblet, M

17th International Sedimentological Congress　2006/08/27
Coral communities in a Pliocene atoll: Kita-Daito-Jima, northern Philippine Sea. International-presentation

Ikeda, E

17th International Sedimentological Congress　2006/08/27
High-resolution seismic survey on the Quaternary sediment off Amami-o shima Island, northern Ryukyu Island Arc, Japan. International-presentation

Arai, K, Matsuda, H, Machiyama, H, Tsuji, Y

17th International Sedimentological Congress　2006/08/27
Upper Pliocene to Lower Pleistocene Carbonate Sequence on Okinawa-jima, Ryukyu Islands, southwestern Japan. International-presentation

Sagae, K, Yamamoto, K, Yamada, T, Chiyonobu, S, Sato, T

17th International Sedimentological Congress　2006/08/27
Preliminary results of the IODP Expedition 310 "Tahiti Sea Level". International-presentation

Camoin, G.F, McInroy, D, Expedition, Scientists

17th International Sedimentological Congress　2006/08/27
Carbon and oxygen isotopic compositions of the articulate brachiopod Kikaithyris hanzawai (Yabe): a recorder of ambient oceanography. International-presentation

Yamamoto, K, Yamada, T

17th International Sedimentological Congress　2006/08/27
Coral-reef Front Migration in the Ryukyu Arc: responses of High Latitude Coral Reefs to Quaternary Climatic Changes in Northwestern Pacific. International-presentation

Matsuda, H, Machiyama, H, Piller, W.E, Quinn, T.M, Mutti, M

17th International Sedimentological Congress　2006/08/27
奄美大島北方海域の第四紀堆積体―IODP琉球サンゴ礁掘削へ向けて

町山栄章, 松田博貴, 荒井晃作, 辻喜弘

日本地球惑星科学連合2006年大会　2006/05/14
Evaluation of carbon and oxygen isotopic compositions of brachiopod shells as paleoenvironmental indicators, Japan.

Yamamoto, K, Yamada, T

Japan Geoscience Union Meeting 2006　2006/05/14
Sub-seasonal reconstructions of South Pacific climate during the last deglaciation from Tahiti corals –Preliminary results from IODP Expedition 310 International-presentation

T. Felis, Ryuji Asami, P. Deschamps, M. Kolling, N. Durand, E. Bard, IODP Ex, Scientists

Annual National German ICDP/IODP Meeting.　2006/03/19
IODP Expedition 310 "Tahiti Sea Level" 航海概要報告

松田博貴, Gilbert Camoin, David McInroy, 次航海乗船研究者一同

炭酸塩コロキウム（つくば）　2006/03/10
奄美大島周辺海域の高分解能シングルチャンネル音波探査

荒井晃作, 松田博貴, 町山栄章, 辻喜弘, 高橋成実

第22回しんかいシンポジウム＆第9回みらいシンポジウム　2006/02/23
熱帯浅海域の環境変動

日本地球掘削科学コンソーシアム陸上掘削サイエンス・プランシンポジウム「地球をのぞくファイバースコープ−陸上科学掘削と社会科学掘削による地球環境変遷復元のブレイクスルー」　2005/12/22
地球化学および結晶化学的手法に基づく環礁性ドロマイトの起源の解明：北大東島産ドロマイトを例にして．

山田努, 鈴木由香, 稲垣静枝, 相沢省一, バッド・デイビッド

第52回日本地球化学会年会　2005/09/26
タヒチ化石サンゴの地球化学的記録が語る第四紀の海洋環境変遷−IODP Expedition 310 (Tahiti Sea Level)の展望−．

浅海竜司, 山田努, ギルバード・キャモアン

第52回日本地球化学会年会　2005/09/26
サンゴ礁の生物から読み取る高分解能環境情報—シャコガイ殻の成長線と同位体比の例—

山田努, 邊見紗知, 浅海竜司

第52回日本地球化学会年会　2005/09/26
西太平洋域における18世紀末以降の海洋環境変動—グアム島のサンゴ骨格記録からの復元—

浅海竜司, 山田努

第52回日本地球化学会年会　2005/09/26
海底ボーリング装置で掘削された喜界海山の石灰岩コア試料から推定される奄美海台北西部の急速な沈降（速報）．

西村昭, 中澤努, 山田努, 柴崎洋志, 塩川智, 棚橋道郎

日本地質学会第112年学術大会　2005/09/18
過去200年間の古エルニーニョ記録．

浅海竜司, 山田努

日本地質学会第112年学術大会　2005/09/18
The last deglacial sea level rise in the South Pacific: offshore drilling in Tahiti (French Polynesia) - IODP Expedition "Tahiti sea level" International-presentation

Camoin, G.F

European Geosciences Union General Assembly　2005/04/24
Coral Reef Front migration – an indicator for Quaternary climate change. International-presentation

Matsuda, H, Machiyama, H, Werner, E.P, Quinn, T.M, Mutti, M

Continental Scientific Drilling 2005: A Decade of Progress and Challenges for the Future　2005/03/30
Oligocene to Pliocene coral reeef formation on Kita-daito-jima, northern Philippine Sea International-presentation

Yuka Suzuki, Tsutomu Yamadad, Shoichi Aizawa

ESF Exploratory Workshop on: Evolution of Carbonate Systems during the Oligocene-Miocene climatic transition　2005/02/22
Geochemistry and crystal chemistry of dolomties on Kita-daito-jima, northern Philippine Sea International-presentation

Yuka Suzuki, Tsutomu Yamadad, Shoichi Aizawa

ESF Exploratory Workshop on: Evolution of Carbonate Systems during the Oligocene-Miocene climatic transition　2005/02/22
Coseismic uplift deduced from zonation of sessile organisms contained in raised limestone adhered in Cape Muroto, southwestern Japan International-presentation

Maemoku, H, Maeda, Y, Yamada, T

Hokudan 2005 International Symposium on Active Faulting　2005/01/20
室戸岬付近に分布する完新世隆起石灰岩を構成する付着生物の帯状分布（Zonation of sessile organisms contained in Holocene raised limestone adhered around Cape Muroto, southwestern Japan）

前田安信, 前杢英明, 山田努

日本地理学会2004年度秋季学術大会　2004/09/25
隆起石灰岩を構成する付着生物の帯状分布からみた室戸岬の地震性地殻変動（Holocene seismic uplift deduced from zonation of sessile orfanisms contained in raised limestone adhered in Cape Muroto, southwestern Japan

前杢英明, 前田安信, 山田努

日本地理学会2004年度秋季学術大会　2004/09/25
Responses of Coral Reefs to Increased Amplitude of Sea-level Changes at the Mid-Pleistocene Climate Transition International-presentation

Yamamoto Kazuyuki, Sato Tokiyuki, Chiyonobu Shun, Sagae Kenichi

10th International Coral Reef Symposium　2004/06/28
The evolution of coral reefs on Kita-daito-jima for the last 25 million years International-presentation

Yuka Suzuki, Tsutomu. Yamada, Sizue Inagaki

10th International Coral Reef Symposium　2004/06/28
Early Pleistocene reef complex deposits on Motobu Peninsula, Okinawa-jima - its significance of the initiation of coral reefs in the Ryukyus International-presentation

Kazuyuki Yamamoto, Tokiyuki Sato, Hiroshi Nakagawa

10th International Coral Reef Symposium　2004/06/28
Topography, biota, and sediments on the northernmost coral reef in the Ryukyu Islands International-presentation

Emiko Ikeda, Tsutomu Yamada, Kaoru Sugihara, Hideo Ohba

10th International Coral Reef Symposium　2004/06/28
Pleistocene reef development on Ie-jima, the Ryukyu Islands, Southwestern Japan International-presentation

Tsutau Takeuchi, Tsutomu Yamada, Kei Odawara

10th International Coral Reef Symposium　2004/06/28
Sedimentology of Holocene warm temperate limestone at Muroto-misaki, Shikoku Japan International-presentation

Yasunobu Maeda, Hideaki Maemoku, Tsutomu Yamada

10th International Coral Reef Symposium　2004/06/28
From mud sea to coral sea – Changes in marine environment in southern Okinawa-jima in early Pleistocene time International-presentation

Kei Odawara

10th International Coral Reef Symposium　2004/06/28
Interannual and decadal variability of the western Pacific sea surface condition for the last two centuries: Reconstruction based on oxygen isotope records from a Guam coral International-presentation

Ryuji Asami, Tsutomu Yamada, Terrence M. Quinn, Christopher P. Meyer, Gustav Paulay

10th International Coral Reef Symposium　2004/06/28
Southwestern Pacific sea surface temperature at 197 ka inferred from oxygen isotopic composition of a Niue coral International-presentation

Takashi Miwa, Tsutomu Yamada, Gustav Paulay

10th International Coral Reef Symposium　2004/06/28
The Middle Pleistocene reef-complex limestone in Maeda-misaki area, Okinawa-jima, the Ryukyu Islands, Japan International-presentation

Muraoka Astuko, Odawara Kei, Yamada Tsutomu, Sato Tokiyuki

10th International Coral Reef Symposium　2004/06/28
Continental scientific drilling into coral reefs near the northern limit. International-presentation

Matsuda, H, Machiyama, H, Piller, W. E, Quinn, T. M, Mutti, M

IODP / ICDP – Euroforum　2004/03/17
A coral-based reconstruction of paleoceanographic changes in the western Pacific for the last 2 centuries International-presentation

Ryuji Asami, Tsutomu Yamada, Terrence M. Quinn

International Review Meeting on the Northern Environmental Change Research Project　2004/03/15
The initiatin and development of coral reefs in the Ryukyu Islands International-presentation

IGCP-476 “Monsoon evolution and tectonic-climate linkage in East China and its marginal seas during the late Cenozoic”　2003/11/21
Growth rate and carbon production of Lithophyllum Pallescens (nongeniculate coralline algae) in Kabira cove, Ishigaki-jima, Ryukyu Islands, southwestern Japan International-presentation

Tsutomu Yamada, Maki Ishihara, Shinya Matsuda, Hiroshi Fujimoto

8th International Symposium on Fossile Algae　2003/09/18
Interannual and decadal variability of sea surface condition recorded in Guam coral for the years 1787-2000 International-presentation

Ryuji Asami, Tsutomu Yamada

13th V.M. Goldschmidt Conferences　2003/09/07
グアム島のサンゴ骨格記録に基づいた過去200年間の海洋環境復元

浅海竜司, 山田努

日本地球化学会第50回年会　2003/09/06
Facies analysis of Tithonian-Berriasian limestone in Torinosu area, Kochi prefecture, Japan International-presentation

Hiromichi Ohga

9th International Symposium on Fossile Cnidaria and Porifera　2003/08/03
Anatomy of Pliocene coral reefs on Kita-daito-jima International-presentation

Yuka Suzuki, Akio Nambu, Sizue Inagaki, Shinsuke Ozawa

9th International Symposium on Fossile Cnidaria and Porifera　2003/08/03
Sedimentology of Holocene warm temperate limestone at Muroto-misaki, Shikoku Japan International-presentation

Yasunobu MAEDA, Hideaki MAEMOKU, Tsutomu YAMADA

9th International Symposium on Fossile Cnidaria and Porifera　2003/08/03
Coral-reef Front Migration in the Ryukyu Arc: Responses of High Latitude Coral Reefs to Quaternary Climatic Changes in North Western Pacific. International-presentation

Hiroki Matsuda, Hideaki Machiyama

XXIII General Assembly of the International Union of Geodesy and Geophysics　2003/06/30
Coral-reef Front Migration in the Ryukyu Arc: Responses of High Latitude Coral Reefs to Quaternary Climatic Changes in North Western Pacific. International-presentation

Hiroki Matsuda, Hideaki Machiyama

EGA-AGU-EUG Joint Assembly　2003/04/06
サンゴ骨格記録の信頼性

山田努, 浅海竜司, 小林久子

2002年度古海洋学シンポジウム　2003/01
琉球サンゴ海の成立—沖縄本島，本部半島基部における上部新生界層序の検討結果から—

山本和幸, 佐藤時幸, 中川洋, 松田博貴

2002年度古海洋シンポジウム　2003/01
微化石および古地磁気層序による島尻層群 / 知念層境界に関する新知見

佐藤時幸, 中川洋, 小松原純子, 松本良, 松田博貴, 大村亜希子, 小田原啓, 武内理香

2002年度古海洋シンポジウム　2003/01
Development and demise of the Miocene platform beneath the inner Marion Plateau. International-presentation

Sasaki, K, Yamada, T, Matsuda, H, Hallock, P

ODP Leg 194 2nd Post-Cruise Meeting　2002/10/07
Nature of Miocene platform dolomites from the northern Marion Plateau. International-presentation

Yamada, T, Sasaki, K, Matsuda, H

ODP Leg 194 2nd Post-Cruise Meeting　2002/10/07
サンゴ骨格の酸素同位体比に記録されたENSOイベント

浅海竜司, 山田努

日本地球化学会　2002/09/26
沖縄県北大東島の地表に分布するドロマイトの形成過程—ニウエ島産ドロマイトとの比較から−

鈴木由香, 山田努

日本地質学会第109年学術大会　2002/09/14
海草藻場における堆積物の特徴と堆積構造

藤田慶太, 山田努, 浅海竜司

日本地質学会第109年学術大会　2002/09/14
化石サンゴの酸素同位体比を用いて復元した海水温の不確実性

小林久子, 山田努, 浅海竜司

日本地質学会第109年学術大会　2002/09/14
グアム島のサンゴ骨格に記録されたWPWPの消長と移動

浅海竜司, 山田努

日本地質学会第109年学術大会　2002/09/14
サンゴ骨格の酸素同位体比とSr/Ca比を用いた古水温・古塩分計の信頼性

山田努, 浅海竜司

日本地質学会第109年学術大会　2002/09/14
青森県深浦町，鯵ヶ沢町地域のドロマイトおよびドロマイトノジュールの成因

五月女亮

日本地質学会第109年学術大会　2002/09/14
沖縄本島，本部半島基部に分布する下部第四系層序の再検

山本和幸, 佐藤時幸, 中川洋, 松田博貴

日本地質学会第109年学術大会　2002/09/14
下部白亜系美良布石灰岩に含まれるooidの特徴と成因

大賀博道

日本地質学会第109年学術大会　2002/09/14
海草藻場における堆積過程を規制する要因

藤田慶太, 山田努, 浅海竜司

堆積学研究会2002年春季研究集会　2002/05
沖縄県石垣島の海藻藻場における堆積過程

藤田慶太, 山田努, 浅海竜司

炭酸塩コロキウム　2002/02/28
喜界島の完新世サンゴの酸素同位体比から推定した古水温とその信頼性

小林久子, 山田努, 浅海竜司

炭酸塩コロキウム　2002/02/28
鉱物組成および炭素・酸素同位体組成からみた沖縄県北大東島の地表に分布するドロマイトの晶出履歴

鈴木由香, 山田努

炭酸塩コロキウム　2002/02/28
沖縄本島における島尻層群・琉球層群境界部付近の堆積相と堆積年代−予察

松田博貴, 中川洋, 佐藤時幸, 尾田太良, 平塚美友紀, 大清水岳史, 山本和幸

炭酸塩コロキウム　2002/02/28
第四紀における琉球列島でのサンゴ礁前線の移動

松田博貴, 町山栄章, 中森亨, 山田努, 砂川奈都召, 佐々木圭一, 坂井三郎, 荒井晃作, 兼子尚知, 辻喜弘

炭酸塩コロキウム　2002/02/28
高知県佐川町一ツ渕鉱山でみられる鳥巣石灰岩の堆積過程

大賀博道

日本古生物学会第151回例会　2002/01/26
造礁サンゴ骨格の形成過程が骨格の炭素・酸素同位体比記録に与える影響

山田努, 浅海竜司

日本古生物学会第151回例会　2002/01/26
試錐試料に基づく宮古島の琉球層群の再検討

小田原啓, 砂川奈都召, 中森亨, 石田聡

日本サンゴ礁学会第4回大会　2001/11/02
グアム島のサンゴ骨格に記録された酸素・炭素同位体比

浅海竜司, 山田努

日本地球化学会第48回年会　2001/10/18
造礁サンゴ群体間における骨格同位体比の非平衡度合いの差とそれが古水温推定に及ぼす影響

山田努, 浅海竜司, 小林久子

日本地球化学会第48回年会　2001/10/18
Succession of late Cenozoic atoll dolomties in Kita-daito-jima

Sizue Inagaki

日本地質学会第108年学術大会　2001/09/21
沖縄本島勝連半島沖の島々に分布する知念層および琉球層群の層位学的研究

大清水岳史

日本地質学会第108年学術大会　2001/09/21
南琉球列島，宮古島の更新世造礁サンゴ群集 —その変化と特徴—

砂川奈都召, 小田原啓, 中森亨, 石田聡

日本地質学会第108年学術大会　2001/09/21
環境指標としてのコケムシ骨格同位体比の有効性－ODP Leg 182：グレートオーストラリア湾を例に－

町山栄章, 山田努, 兼子尚知, 小田原啓, 浅海竜司, 松田博貴, 馬渡駿輔, Yvonne Bone, Noel P. James

日本地質学会第108年学術大会　2001/09/21
グアム島のハマサンゴ骨格に刻まれたENSOイベント

浅海竜司, 山田努

日本地質学会第108年学術大会　2001/09/21
青森県深浦町に分布する田野沢層の苦灰岩

五月女亮

日本地質学会第108年学術大会　2001/09/21
沖縄本島北部，本部半島の第四系サンゴ礁堆積物（琉球層群）

山本和幸, 佐藤時幸, 中川洋, 松田博貴

日本地質学会第108年学術大会　2001/09/21
隆起サンゴ礁段丘における旧汀線高度の高精度復元と第四紀の地殻・海水準変動の解明

杉原薫, 中森亨, 佐々木圭一

日本地質学会第108年学術大会　2001/09/21
Modulated inclusive records from hermatypic coral skeletons: an Approach from mathematycal model International-presentation

Yamada, T, Asami, R

7th International Conference on Paleoceanography　2001/09/16
Can bryozoan isotopes be used as Paleoceanographic proxy? International-presentation

Machiyama H, Kaneko N, Yamada T, Odawara K, Asami R, Matsuda H, Mawatari S. F, Bone Y, James N. P

7th International Conference on Paleoceanography　2001/09/16
Skeletal records in a hermatypic coral (Porites lobata) from Guam, in the West Pacific. International-presentation

Asami, R, Yamada, T, Nakamori, T, Paulay, G, Meyer, C.P

7th International Conference on Paleoceanography　2001/09/16
Carbon and oxygen isotopes of cool-water bryozoan skeletons from the Great Australian Bight, and their paleoenvironmental significance. International-presentation

Machiyama, H, Kaneko, N, Yamada, T, Odawara, K, Asami, R, Matsuda, H, Mawatari, S.F, Bone, Y, James, N.P

21st IAS Meeting of Sedimentology　2001/09/03
Responses of high latitude coral reefs to Quaternary climatic changes in north western Pacific International-presentation

Matsuda, H, Machiyama, H

APLACON(An International Conference aimed at integrating Alternate Platforms (Mission Specific Platforms) as part of the Integrated Ocean Drilling Program (IODP))　2001/05/10
Early Holocene d18O-based SSTs in fossil Porites from Kikai-jima, Ryukyu Islands, Japan. International-presentation

Yamada, T, Kiyama, O, Nakamori, T

International Workshop on Pacific Coral　2001/02/08
Biological modulation of stable isotopic signals in coral skeletons. International-presentation

Yamada, T, Hirunuma, N, Nakamori, T

International Workshop on Pacific Coral　2001/02/08
Skeletal records in a hermatypic coral (Porites) from Guam, Western Pacific. International-presentation

Asami, R, Yamada, T, Nakamori, T, Paulay, G, Meyer, C.P

International Workshop on Pacific Coral　2001/02/08
琉球列島石垣島に生育するヒライボ（無節サンゴモ）の有機炭素・無機炭素生産量測定

石原麻貴, 松田伸也, 山田努

日本古生物学会第150回例会　2001/01/28
グアム島のPorites lobata骨格から推定される過去200年間の海洋環境変化

浅海竜司, 山田努, 中森亨

日本古生物学会第150回例会　2001/01/28
Early Holocene d18O-based SSTs modulated by "viral effects" of hermatyopic corals (Porites) International-presentation

Yamada, T, Kiyama, O, Nakamori, T

9th International Coral Reef Symposium　2000/10/23
Composition and distribution of relatively fine-grained sediments off Miyako-jima, Ryukyu Islands, Japan International-presentation

Ogoshi, T, Tsuji, Y

9th International Coral Reef Symposium　2000/10/23
Late Holocene sea-level changes and tectonic uplift at Kikai-jima, Ryukyu Islands, Japan International-presentation

Sugihara, K, Nakamori, T

9th International Coral Reef Symposium　2000/10/23
Pleistocene reef development and sea-level changes: evidence from the Ryukyu Group of Southwestern Japan International-presentation

Sagawa, N, Nakamori, T

9th International Coral Reef Symposium　2000/10/23
グアム島のハマサンゴはどのような海洋環境の変化を記録しているのか

浅海竜司, 山田努, 中森亨, Gustav PAULAY, Christopher, P. MEYER

日本地質学会第107年学術大会　2000/10/01
鹿児島県徳之島の第四系サンゴ礁堆積物（琉球層群）

藤田慶太, 山田努

日本地質学会第107年学術大会　2000/10/01
沖縄県石垣島の第三系始新統礁性堆積物（宮良層）の堆積過程

小田原啓, 荒井晃作

日本地質学会第107年学術大会　2000/10/01
沖縄県伊良部島沖海底コアに見られる海水準変動に伴う炭酸塩堆積相の変化

松田博貴, 西山夕美子, 三沢倫昭, 山田努, 中森亨, 佐藤由理, 辻喜弘

日本地質学会第107年学術大会　2000/10/01
Attenuation of skeletal isotope signals by coral growth processes. International-presentation

Yamada, T, Hirunuma, N, Nakamori, T

International Workshop on Submerged Coral Drilling　2000/09/27
Sedimentation of Eocene rhodolith-dominated fore-reef deposits: Ishigaki-jima, northwestern Pacific International-presentation

Odawara, K

Sediment 2000　2000/06/21
Coral zonation of fringing reefs of Ishigaki-jima, Ryulkyu Islands International-presentation

Sugihara, K, Nakamori, T

JAMSTEC International Coral Reef Symposium　2000/02/23
造礁サンゴ骨格形成時の同位体非平衡反応について

山田努, 香川裕之, 中森亨

第265回地質調査所研究発表会　2000/02/04
喜界島の完新世隆起サンゴ礁段丘における旧汀線高度の復元

杉原薫, 中森亨

日本古生物学会2000年年会・総会　2000/01/30
Evolution of reef biota from Cretaceous to present in relation to carbon cycle. International-presentation

Nakamori, T

1st International Symposium of IGCP 434　2000/01/25
喜界島の完新世隆起サンゴ礁段丘における旧汀線高度の復元

杉原薫, 中森亨

日本サンゴ礁学会第2回大会　1999/10/30
ヒメジャコ用人工基質の開発研究一2 基質の形状と化学組成

村越正慶, 大森保, 渡邊環

日本サンゴ礁学会第2回大会　1999/10/30
Depositional and diagenetic history of Kita-daito-jima for the last 25 million years. International-presentation

Inagaki, S

International Symposium on Paleoceanography of reefs and carbonate platforms: Miocene to Modern　1999/09/27
Pleistocene reef development in Irabu-jima and Shimoji-jima, Ryukyu Islands, Japan International-presentation

Sagawa, N, Nakamori, T

International Symposium on Paleoceanography of reefs and carbonate platforms: Miocene to Modern　1999/09/27
Reef development of the Pleistocene Ryukyu Group of Irabu-jima, Okinawa on the basis of hermatypic coral assemblages. International-presentation

Sagawa, N, Nakamori, T, Kano, A

8th International Symposium on Fossil Cnidaria and Porifera　1999/09/12
Community structure and diversity of hermatypic corals on fringing reefs of Ishigaki-jima, Ryukyu Islands. International-presentation

Sugihara, K, Nakayama, N, Nakamori, T

8th International Symposium on Fossil Cnidaria and Porifera　1999/09/12
Attenuation of skeletal isotope signals by coral growth processes International-presentation

Yamada, T, Hirunuma, N, Nakamori, T

19th Pacific Science Congress　1999/06/04
鹿児島県与論島の第四系サンゴ礁堆積物（琉球層群）

小田原啓

日本地質学会第105年学術大会　1998/09/25
北大東島試錐試料にみられる炭素・酸素同位体比の負のスパイクとその地質学的意義

稲垣静枝

日本地質学会第105年学術大会　1998/09/25
Sedimentology and oxygen and carbon isotope stratigraphy for Kita-daito-jima Bore Hole. International-presentation

Inagaki, S

15th International Sedimentological Congress　1998/04/12
無節サンゴモ Neogoniolithon variabile Zhang et Zhouの分類学上の位置について

松田伸也, 仲里静江, 古波蔵美香

日本古生物学会1998年年会　1998/01/30
無節サンゴモ Neogoniolithon variabile Zhang et Zhouの分類学的再検討

松田伸也, 仲里静江, 古波蔵美香

日本サンゴ礁学会設立大会　1997/11/02
Cyanobacterial origin of syngenetic microcrystalline cements from Pleistocene corallinacean crusts and rhodoliths of Okierabu-jima (Ryukyu Islands,. Japan) International-presentation

Kazmierczak, J

18th Regional Meeting of Sedimentology　1997/09/02
無節サンゴモの修復

長岡香百合, 松田伸也

日本古生物学会1997年年会　1997/01/30
古生物タイプ標本データベース

森啓, 海保邦夫, 佐々木理, 佐藤智洋, 島本昌憲, 中森亨, 根本潤

日本古生物学会1997年年会　1997/01/30
伊良部島島棚縁から得た礁性石灰岩掘削試料のウラン系列年代

大村明雄, 佐々木圭一, 三輪哲生, 辻喜弘, 松田博貴, 中森亨, 山田努, 佐藤由理, 中川洋

第四紀学会　1996/08/22
U-series ages of lowstand reefal limestone beneath the edge of insular shelf off Irabu Island. International-presentation

Omura, A, Sasaki, K, Miwa, T, Tsuji, Y, Matsuda, H, Nakamori, T, Yamada, T, Sato, Y

30th International Geological Congress　1996/08/04
Pleistocene fore-reef rhodoliths from the Ryukyu Islands, southwestern Japan International-presentation

International Coral Reef Symposium　1996/06/22
造礁生物の進化と炭酸塩堆積物

日本地質学会第103年学術大会　1996/04/01
伊良部島島棚縁から得た礁性石灰岩掘削試料のウラン系列年代

大村明雄, 佐々木圭一, 三輪哲生, 辻喜弘, 松田博貴, 中森亨, 山田努, 佐藤由理, 中川洋

日本地質学会第103年学術大会　1996/04/01
琉球列島のサンゴ礁内における生物分布

中森亨, 中山伸朗, 阿部理, 浅田茂豊

日本古生物学会1996年年会　1996/01/26
第四紀気候変動に伴う造礁サンゴ群集の変遷と礁の成長

中森亨, 山田努

日本古生物学会1996年年会　1996/01/26
北大東島の石灰岩・苦灰岩の堆積および続成史

中森亨, 小澤伸介, 森啓, 松田博貴

海洋研シンポジウム「炭酸塩の堆積相，生物相，化学組成と堆積環境」　1996/01/26
Pleistocene sea-level changes and the consequent development of reefs in the Ryukyu Islands, southwestern Japan. International-presentation

Nakamori, T, Yamada, T

Reefs and Carbonate Platforms in the Pacific and Indian Oceans: An International Workshop　1995/07/10
中央太平洋海山群の白亜紀石灰岩の堆積相─ODP Leg. 143の成果─

海洋研シンポジウム「炭酸塩の堆積相，生物相，化学組成と堆積環境」　1994/02/14
北大東島の石灰岩・苦灰岩の堆積および続成史

中森亨, 小澤伸介, 森啓, 松田博貴

海洋研シンポジウム「炭酸塩の堆積相，生物相，化学組成と堆積環境」　1994/02/14
東オーストラリア温帯海域の陸棚上における無節サンゴモ堆積物

辻善弘, 松田博貴, 本田信幸, John F.M, Peter J.D

日本古生物学会1994年年会　1994/01/27
東オーストラリア，フレイザー島沖の石灰藻球

辻喜弘, 松田博貴, 本田信幸, John F. Marshall, Peter J. Davies

第５回炭酸塩コロキウム　1993/10/16
北大東島試錐試料の岩相層序の再検討

小澤伸介

日本地質学会第100年学術大会　1993/04/03
第四紀気候変動と琉球層群

中森亨, 鈴木淳, 山田努

日本地質学会第99年学術大会夜間小集会「炭酸塩堆積学に関する懇談会」　1992/04/04
琉球層群から第四紀海水準変動をどのように読み取るか．

山田努

サンゴ礁研究会第2回研究集会　1990/09/07

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Research Projects 43

アラブ首長国連邦アブダビ海域における白亜系炭酸塩岩の同位体層序学的研究 Competitive

System: Cooperative Research

2011/04 - Present
グレートバリアリーフにおける過去2万年間の海洋環境変動 Competitive

System: International Joint Research Projects

2011/03 - Present
Brachiopod geochemistry: toward establishing a robust paleoceanographic proxy Competitive

System: Grant-in-Aid for Scientific Research

2007/04 - Present
タヒチ島における過去2万年間の海水準変動と海洋環境変遷の解明（国際統合深海掘削計画第３１０次航海） Competitive

System: International Joint Research Projects

2006/08 - Present
Seismic uplifts deduced from raised carbonate deposits Competitive

System: Grant-in-Aid for Scientific Research

2000/06 - Present
Paleoceanographic variability recorded in hermatypic coral skeletons Competitive

System: Grant-in-Aid for Scientific Research

1997/04 - Present
Depositional and diagenetic history of carbonate rocks on Kita-daito-jimd for the last 25 millior years Competitive

System: Grant-in-Aid for Scientific Research

1993/04 - Present
Role of coral reefs in the global biogeochemical sycles ecosystem Competitive

System: Grant-in-Aid for Scientific Research

1983/04 - Present
Taxonimic studies of modern and fossil nongeniculate coralline algae Competitive

1981/04 - Present
Responses of coralreefs to Quaternary climate changes in the Ryukyu Islands Competitive

System: Grant-in-Aid for Scientific Research

1981/04 - Present
Effects and mechanism of burial diagenesis on the chemical composition of biogenic carbonates

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2023/04/01 - 2027/03/31
Effects and mechanism of burial diagenesis on the chemical composition of biogenic carbonates

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2023/04 - 2027/03
大型海洋生物の化学分析による過去400年の水温・塩分時系列と黒潮変動の解析

浅海竜司, 井龍康文, 阿部理, 成瀬貫, 高柳栄子, 杉本周作

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(B)

Institution: 東北大学

2022/04/01 - 2026/03/31
Development of an easy and accurate method for screening diagenetically unaltered carbonate samples

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Challenging Research (Exploratory)

Institution: Tohoku University

2021/07/09 - 2024/03/31
Reconstruction of late Quaternary sea-level and reef growth history in the Ryukyu Islands

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Nagoya University

2021/04/01 - 2024/03/31
「雪玉地球」後の急激な生物進化に関する実証的研究

大路樹生, 井龍康文, 高柳栄子

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(B)

Institution: 名古屋大学

2019/04/01 - 2024/03/31

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カンブリア系の動物化石群として有名なカナダのバージェス頁岩の動物化石群を蒲郡市生命の海科学館から借用し、それらを２枚の偏光板で挟む手法を用いて光学観察することで軟体部を含む明瞭な形態情報を得ることができた。この手法で多数の標本が産出するMarrella splendensの表面を観察したところ、その腹部から尾部にかけて黒色の染みの存在がほぼすべての個体に見ることができた。この染みの面積は化石体の大きさに正の相関を持つことから、化石化過程の初期に体の内部から染み出した体液に起因するものであることが推察された。カンブリア紀の動物多様化に比較される現象である、古生代末の大量絶滅後の海洋動物の回復現象に関する研究を、宮崎県高千穂地域の上村石灰岩をフィールドに行い、特にそこに含まれている二枚貝類のサイズ変化を追跡することで海洋底生動物と環境変遷との対応を調べた。その結果、ペルム紀・三畳紀境界以降サイズ増加が見られるものの、Smithian階以降順調に大型化するわけではなく、底生動物にとってストレスのかかった環境が継続していたことが示唆される。またカンブリア紀に引き続いて多様化の現象が起きたオルドビス紀初期の化石群として、モロッコ産の節足動物化石の研究を開始し、これがカンブリア紀の生き残りで大型化した、二枚の殻を持つ節足動物化石である可能性を指摘することが出来た。この研究を進めるためには、今後モロッコ産の同様の化石標本を海外で観察し、比較する必要がある。
氷期－間氷期における北太平洋亜熱帯モード水の挙動とその役割

高柳栄子, 井龍康文, 横山祐典, 若木仁美, 石川剛志, 板木拓也, 若木重行

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(B)

Institution: 東北大学

2019/04/01 - 2022/03/31

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過去の亜熱帯モード水の分布・物理・化学的性質を再現性高く復元するためには，現在の亜熱帯モード水影響下の現生生物・準化石の群集組成・地球化学データと実際の海洋観測データおよび水塊構造を比較し，亜熱帯モード水の分布・組成を定量的に評価できる手法を作成し，それを化石試料に応用する必要がある．2020年度は，2019年度に現生試料を用いて確立した手法を琉球列島周辺海域より得られた腕足動物の準化石に応用し，過去約2万年間の亜熱帯モード水の物理・化学的性質（水温・塩分・溶存酸素濃度・炭酸系など）および分布と琉球列島中層域の水塊構造の時系列変化を検討した．具体的には，2019年度に確立したB. lucida準化石が1）合弁試料，2）離弁試料，3）破片試料だった場合に分けたサンプリング法に基づいて粉末試料を作成し，その炭素・酸素同位体分析，微量金属元素分析，放射性炭素年代測定などを行った．また，琉球列島周辺の表層堆積物のネオジム・ストロンチウム同位体比も検討した．その結果，B. lucida準化石の炭素・酸素同位体比から過去2万年間の水温・塩分，溶存無機炭素濃度の空間分布の変化を部分的に復元することができた．また，同準化石の微量金属元素濃度分析は，同一試料に物理・化学クリーニングを行い，その必要性について検討している．琉球列島周辺の表層堆積物のネオジム・ストロンチウム同位体比を分析した結果，沖縄本島周辺と八重山諸島周辺とで，亜表層水の海水の起源が異なる可能性が示唆された．
Holocene atmospheric-ocean variability reconstruction from high-resolution analyses of stalagmites and corals in the Ryukyu Islands

Asami Ryuji, Uemura Ryu, Shinjo Ryuichi, Iryu Yasufumi, Shen C.-C.

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Young Scientists (A)

2014/04/01 - 2019/03/31

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In order to evaluate the present and future global environment, it is important to understand climate change from the past to the present. Therefore, to understand the environmental change in the East Asia-Northwest Pacific region during the last glacial and the Holocene (about 20,000 years ago to today), highly-accurate and -resolution analyses of chemical composition in stalagmites in the limestone caves of the Ryukyu Islands were performed in this study. As a result, robust time series of thermal and hydrological variations showing post-glacial climate change was successfully generated. Coupled together with geological data from marine organisms such as corals, an index of the marine environment, this study showed a reconstruction of the atmospheric-ocean variability history around the Ryukyu Islands showing the East Asian summer/winter monsoon and decades-scale variability.
AUV exploration of the mesophotic reef zone in the South Ryukyu Islands

Humblet Marc, Maki Toshihiro, Furushima Yasuo, Iryu Yasufumi, Sakamaki Takashi, Sinniger Frédéric

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Young Scientists (B)

Institution: Nagoya University

2016/04/01 - 2018/03/31

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The mesophotic seafloor around the Sekisei Lagoon was surveyed at two sites: site KT (lat. 24.27°, long. 124.08°; 30-110 m), site TN (lat. 24.35°, long. 124.08°; 30-45 m), using robotic submersibles. A new autonomous underwater vehicle (AUV HATTORI) was developed to acquire high-resolution video images of the seafloor. The AUV was equipped with sensors measuring temperature, salinity, and light intensity down to 45 m at both sites. Additional video images were acquired using remotely operated vehicles. There are differences in coral communities occurring at upper mesophotic depths (30-40 m) between site KT and site TN: low coral cover and taxa comprising Porites and merulinids at site KT, and high coral cover with abundant Leptoseris and Acropora at site TN. In addition, a clear depth zonation was observed at site KT with a transition from coralgal communities to a mixed community at around 60 m. This study also highlights the patchiness of benthic communities at mesophotic depths.
From Snowball Ice to the Cambrian explosion: toward better understanding of the linkage between earth's environmental dynamics and biotic evolution

Oji Tatsuo, DORNBOS STEVEN Q., GONCHIGDORJ SERSMAA

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Nagoya University

2015/04/01 - 2018/03/31

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Two species of fossil algae were discovered from the Ediacaran of Zuun Arts, western Mongolia. The beds that contained these algae were concluded as special type of sedimentary rock known as "Burgess-type deposit" based on the chemical analysis and the mode of preservation. In addition, vertical trace fossils were discovered from the Ediacaran of Bayan Gol gorge. These trace fossils show U-shape that penetrate down to 4cm below the uppermost opening, suggesting that the producer was a bilaterian animal that was elongate in form and could burrow deep into the sediment, thus possessed ample musculature. Also this burrow suggests existence of predatory animals. This discovery was contradictory to the existing interpretation about Ediacaran life, firstly giving possible evidence of the existence of bilaterian animals and also predatory animals.
Carboniferous and Permian paleoceanographic condition reconstruced from caron and oxygen isotope composition of brachiopod shells from Thailand

Yasufumi Iryu, YAMAMOTO Koshi, HARA Hidetoshi, ASAMI Ryuji, ABE Osamu, TAKAYANAGI Hideko

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2014/04/01 - 2017/03/31

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There are significant intrashell variations in carbon and oxygen isotope composition (d13C and d18O, respectively) and trace element concentrations in modern brachiopod shells. This knowledge was applied to Carboniferous and Permian brachiopod shells collected from central Thailand, resulting in the establishement of a standard protocol to find shell portions, the original isotopic and chemical compositions of which were not affected by the vital effect and diagenetic alteration. Capitanian (Permian) seawater temperature estimated from the d18O values of such shell portions was 28-35 °C. This value is very similar to that in the equatorial region.
Response of coral reefs and coral reef ecosystems to Quaternary climate changes

Yasufumi Iryu, MATSUDA Hiroki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2013/04/01 - 2017/03/31

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Sedimentological and paleontological studies were conducted on Quaternary reef complex deposits and underlying siliciclatics on the Ryukyu Islands to delineate responses of coral reefs and coral reef ecosystem to Quaternary climate changes. Based on the results of these studies along with knowledge on the current phylogeographical patterns and past changes in various terrestrial biotic lineages, geological and paleoceanographic evolution of the islands was reconstructed. Latitudinal variations in the taxonomic compositions (e.g., species and generic richness) of fossil coral assemblages was shown to be not so clear as those of modern assemblages., due to various taphonomic bias to preservation of the latter. Fossil and modern calcareous species and their distributions in the Ryukyu Islands were reported and their paleontological implications were discussed.
Reconstruction of past marine environment using coral skeletons collected from Ishigaki Island, southwest of Japan

ABE Osamu, IRYU Yasufumi, ASAMI Ryuji, MORIMOTO Maki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Nagoya University

2012/04/01 - 2016/03/31

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To reconstruct past marine environments for the last millenium at low-latitude, where paleoenvironmental information is limited, we collected modern and fossil coral skeletons from Ishigaki Island and determined ages, oxygen isotopic composition and minor metal concentrations. We obtained total 1015 years coral records containing the periods of Little Ice Age as well as Medieval Climatic Anomaly.
Geological histories and local subsidence of the Ryukyu Island Arc

ARAI Kohsaku, IRYU Yasufumi, MACHIYAMA Hideaki, INOUE Takahiko, SATO Tomoyuki, MATSUDA Hiroki, SASAKI Keiichi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: National Institute of Advanced Industrial Science and Technology

2011 - 2013

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The Miyako-Sone submarine platform is located between Okinawa-jima and Miyako-jima islands extends approximately 70 km from north to south and 50 km from east to west, and water depths along the outer edge range from 120 to 170 m. We obtained detailed data in this area to investigate the geological histories of subsidence of the platform. Steep slope of western margin of the platform have been downthrown towards the west due to displacements on the western sides of normal faults. Subsidence of the Miyako-Sone submarine platform was the result of large vertical displacements on such normal faults. We also found the clear image of submerged coral reef on the platform that is formed during last deglaciation ages.
Paleontological and sedimentological investigations on the Jurassic Torinosu Limestone, Japan Competitive

1995/06 - 2012/03
Isotopic compositions of brachiopod shells. Toward a definitive understanding ofδ^<13> C andδ^<18> O evolution of Phanerozoic seawater

IRYU Yasufumi, KITAGAWA Hiroyuki, OTAKE Tsuguo

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Nagoya University

2009 - 2011

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This study examines inter-and intraspecific variations in carbon-and oxygen-isotope compositions(.^<13> C and.^<18> O) of modern brachiopod shells to establish sound basis to use the.^<13> C and.^<18> O values of fossil brachiopods as proxies for.^<13> C values of dissolved inorganic carbon and seawater temperature and/or.^<18> O values(.^<18> OSW). Interspecific variations in.^<13> C and.^<18> O values of six modern-brachiopod species collected from a subtropical to cool-temperate environments showed that the degree of the vital effect is highly variable among species. Intraspecific variation in.^<13> C and.^<18> O values of two modern-brachiopod species(9 and 8 specimens of Basiliola lucida and Terebratulina crossei, respectively) demonstrated that.^<13> C and.^<18> O values of some shell portions show small variations and are identical or close to those of calcite precipitated in isotopic equilibrium with the surrounding seawater. Such portions are useful to reliably reconstruct ancient ocean environments.
Paleoceanographic evolution of south Pacific Ocean for the last20,000 years : IODP Expedition 310, Tahiti Sea Level

IRYU Yasufumi, KAWAHATA Hotaka, MATSUDA Hiroki, YOKOYAMA Yusuke, MACHIYAMA Hideaki, YAMADA Tsutomu

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

2006 - 2008
Geomorphological and Geological verification for documented paleo-seismic activity occurred in Nankai trough

MAEMOKU Hideaki, IRYU Yasufumi, YAMADA Tsutomu

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: Hiroshima University

2006 - 2007

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The main puipose of the research project is to verify huge earthquakes which were identified through historical documents in geological or geomoiphological method. Sedimentologic analyses were conducted on Holocene limestones that occur along the mast from Muroto-misaki to Meoto-iwa, located ~13km north of the cape. The limestones are limited to less than 9.2 in in elevation. The limestones are up to 4.4 min mean diameter, up to 0.5 in in thickness, and consist mainly of ossilized sessile organisms, including annelids, corals, biyozoans, encrusting foraminifers, barnacles, nongeniculate coralline algae, and, to a lesser extent, molluscs and peyssonneliacean algae. Acicular and equant cements are minor components. Acicular cements are found in semiclosed spaces between coralline algal crusts and their substrates. The modal composition of limestones was determined by a point-cointing technique. Based on the biotic composition, the Holocene limestones can be classified into six types(Types I to VI) A comparison of the vertical distribution of these rock types with that of modem sessile organisms indicates that the top of Type I limestone, which is characterized by the occurrence of hennatypic corals, corresponds approximately to the mean low water springs when the limestones formed. A difference in the highest occurrence of Type I limestone between two sites may represent the variation in the total amount of uplift over the last 1000 to 1500 years, which resulted in an apparent northward decline of palemnean low water springs at a rate of ~10cm/km. Therefore, the Holocene limestones are a good paleobathymeter to reconstruct past seismic activities in this area. This study shows thatwann temperate carbonate deposits are as excellent recorders of geologic events, such as the timing and scale of repeated coseismic uplifts and elevation of sea levels, as those in the tropics.
Reconstruction of daily sea-surface environments using tridacnid shells

YAMADA Tsutomu, IRYU Yasufumi, YOSHIMURA Kazuhisa, AIZAWA Shoichi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2005 - 2007

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To reconstruct daily paleoenvironmental changes in tropical-subtropical regions using tridacnid shells, we developed analytical methods of the shells and attempted to reveal quantitative relationships between carbon and oxygen isotope compositions, daily growth rate and elements/calcium ratios, and growth environments. Then we applied our results to fossil tridacnid shells and try to reconstruct paleoenvironmental changes. Shell materials of tridacnid shells formed in the first decade of life are suitable for daily environmental reconstruction because growth rate of the shells decrease sharply at around 10 years after birth. Carbon and oxygen isotopic profiles in three skeletal regions (inner layer, outer layer and hinge area) are very similar, and all regions are formed at oxygen isotopic equilibrium with ambient seawater. Isotopic compositions of the shell materials at daily resolution are enable to analyze using new sampling methods with a micro-dissector. Major factors controlling daily growth rate of the shells are revealed to be water temperature and amount of isolation, but contributing structure of the two factors are difficult to resolve at this time. Mg/Ca and Sr/Ca ratios of carbonate reference material (JCt-1) and a fossil tridacnid shell from Ishigaki-jima are analyzed using ICP-AES with double spectrometers. The ratios do not exhibit a clear seasonal cycle and are extremely low compared to those of reef-building corals that form calcareous skeletons out of isotopic equilibrium. Calcification process of tridacnid is expected to be different from that of reef-building corals.
Comprehensive Study on Ocean Floor Dynamics

TOKUYAMA Hidekazu, TAMAKI Kensaku, MATSUMOTO Ryo, YASUDA Hisato, TAKAHASHI Kozo, IRYU Yasufumi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research on Priority Areas

Institution: The University of Tokyo

1999 - 2005

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Ocean floor controls an emission of heat and mass from the interior part of the Earth, in particular from mantle. And, ocean acts as a reservoir of mass flux in earth system in a sense, suggesting that the Earth is related to the circulation of mass in the upper part of the Earth. It is well known that history of dynamic earth system has been recorded in deep ocean floor sediments since last 150Ma. Therefore, decoding of the record will provide us new information that creates new paradigm of earth science. In order to develop deep ocean floor science, we need core drilling samples recovered from deep sea as the first step. The second step is characterized by geochemical and geophysical analysis including age determination. The third is in situ geophysical and geochemical measurement in borehole. Finally, we set up long-term borehole observatory in order to monitor ongoing dynamic change of the Earth interior. Our research group is composed following five subgroups such as comprehensive ocean floor dynamics subgroup, subduction zone subgroup, oceanic plateau and mantle plume subgroup, methane hydrate subgroup, and deep biosphere /evolution of life group. The results of our research are listed as follows. 1) New scenario regarding to the process of methane hydrate formation, dissociation, and concentration is proposed 2) Extremely warm climate and mass extinction of life are closely related to dissociation of methane hydrate 3) Millennium scale environmental change is induced by thermal and dynamic impact resulting from outside of globe 4) Surface global environmental change is associated with plate dynamics 5) Global seismic network using borehole is constructed 6) New findings are acquired in both fields of ecosystem of bacteria in deep crust and circulation of surface mass of the Earth
第17回国際堆積学会議日本開催のための堆積学研究動向調査

松本良, 牧野泰彦, 鈴木徳行, 松田博貴, 井龍康文, 町山栄章

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(C)

Institution: 東京大学

2004 - 2004

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2006年に福岡で開催される予定の国際堆積学会議の準備作業を、以下の項目について進めた 1、組織委員会の立ち上げ日本堆積学会と日本地質学会を母体として組織委員会を正式に立ち上げ、専門委員会を組織した。会長=松本良、名誉会長=岡田博有、事務局長=松田博貴、副会長=平朝彦、立石雅昭、公文富士夫、牧野泰彦、財務委員長=鈴木徳行、プログラム委員長=保柳康一、巡検委員長=伊藤慎、広報委員長=井龍康文 2、ファーストサーキュラーとホームページの作成会議の概要を記したファーストサーキュラーを国際堆積学協会の雑誌を通じて世界中に配布した。サーキュラーには、プログラム内容についてのアンケートをいれ意見を収集した。ファーストサーキュラーの内容を掲載したホームページを作成し、昨年9月より運用している。運用にあたっては近畿日本ツーリストに管理を依頼した。 3、プログラム案の検討堆積岩の基本的分類にそったカテゴリーや堆積過程と環境分野および最近話題のテーマである微生物やガスハイドレート、地球外の堆積学など幅広いテーマをカバーしてプログラム案を作成した。 4、国際堆積学協会の理事会の開催 2004年5月、表記会議を、国際堆積学会議が開催される予定の福岡国際コンベンションセンターにおいて開催し、関係者に会場や運営についての説明を行った。さらに理事会に引き続いて国際シンポジウムを開き、九州大学などからの学生教員多数の参加を得た 5、巡検候補地の下見 2006年の会議の巡検地として提案されている高知県の横浪半島付近において理事会メンバーによる下見と地質見学を行った。ほかの候補地についても関係者による下見、地質調査を行った。 6、資金計画の立案を寄付の依頼等会議の成功に基本的に重要な資金集めを始め、石油会社等からすでに寄付の約束を得ている。
IODPにおける科学提案「第四紀気候変動に対するサンゴ礁の応答」に関する企画調査

松田博貴, 井龍康文, 中森亨, 佐藤時幸, 杉原薫, 佐々木圭一

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(C)

Institution: 熊本大学

2003 - 2003

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本企画調査は,「気候・海洋環境変動に伴いサンゴ礁分布域の北限・南限(「サンゴ礁前線」)は移動する」というモデルに立脚し,琉球列島を調査対象域として,1)「サンゴ礁前線」の移動に基づくサンゴ礁形成の規制環境要因の解明および気候・海洋環境変動の復元,2)種々の時間スケールでの環境変動に対するサンゴ礁生態系の応答,ならびに3)全球的炭素循環におけるサンゴ礁の機能と影響,を解明するための科学提案「第四紀気候変動に対するサンゴ礁の応答」の実現を目的として実施された. 企画調査では,国内外関連研究者13名により,現在のサンゴ礁北限近傍に位置する喜界島でのワークショップ(2003年8月),ならびに東京での公開シンポジウム"氷期にサンゴ礁の北限はどこだったのか??-I0DP/ICDP掘削プロジェクト「サンゴ礁前線の移動に基づく氷期・間氷期の環境変動解析」の実現に向けて-"(2004年1月)を通じて,1)様々な生物指標・化学プロキシーからの気候・海洋情報の抽出・解析法の総括,2)仮説検証に最大効率を生みだす最適掘削地点の選定,3)コア試料を補完する検層の選定と検層計画の最適化,4)サンゴ礁性堆積物における掘削ツールと掘削計画の最適化,について,炭酸塩堆積物,造礁生物,地球化学,年代決定などの観点から,多角的に検討を加えてきた. 今後は,これらの討議により明らかにされた問題点や技術的課題について検討していくとともに,データ蓄積の乏しい北限域のサンゴ礁ならびに礁性堆積物の調査を継続し,早期の科学掘削の実現を図る.なお本企画調査の成果については,特集号として出版する予定である.
Reconstruction of paleoseismic history in the Nankai Trough Zone by analyzing Holocene raised limestones

MAEMOKU Hideaki, IRYU Yasufumi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: Hiroshima University

2001 - 2003

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This study aims to elucidate paleoseismic history in the Nankai Trough Zone by using Holocene raised limestones attached to coastal rocks. Sedimentological study was conducted on Holocene limestone that occurs along the coast from Cape Muroto to Meoto-iwa located about 13 km to the north of the cape. Distribution of the limestone is limited to <10 m in elevation. The limestone is up to 4.4 meter in mean diameter and less than 0.5 m in thickness, and consists mainly of fossilized sessile organisms such as annelids, bryozoans, corals, encrusting foraminifera, and coralline algae. Associated components include barnacles, ostracods, molluscs, echinoids, benthic foraminifera, peyssonneliacean algae, and non-calcareous clasts and grains. Cement is a minor component and found in a semi-closed space between coralline algal crusts and their substrates. Modal composition of limestone was determined by a point counting technique. The results show that the limestone can be classified into 6 types on the basis of predominant fossilized sessile organisms. The dominant components are : corals and coralline algae in Type I ; coralline algae in Type II ; coralline algae, annelids and barnacles in Type III ; coralline algae and annelids in Type IV ; encrusting foraminifera and encrusting bryozoans in Type V ; and molluscs in Type VI. Comparison of vertical distribution of the six types with those of modern sessile organisms indicates the highest elevation of Type I at a particular outcrop corresponds to mean low sea level (MLSL) when the limestone formed. Therefore the Holocene limestone is considered ideal for the analysis of relative sea-level changes.
Record of Meso-and Paleozoic environmental change and biotic evolution in calci-microbial sedimnent

SANO Hiroyoshi, KAWAMURA Toshio, MATSUMOTO Ryo, IRYU Yasufimi, KANO Akihiro, EZAKI Yoichi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Kyushu University

2001 - 2003

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Part of results of this research program have been published in relevant journals and presented at many conferences and meetings. Major results are summarized as follows ; 1.Highly diverse calci-microbes, mainly of cyanobacteria, were recognized at many stratigraphic levels of shallow-marine carbonate units in Japan, but also in South China, western Canada, Ws confirmed their occurrence ranges in age from Silurian to Quaternary(Recent) through the field and microscopic examination. 2.Calci-microbes were recognized in a wide range of shallow-marine carbonate facies, and occurs as significant sediment-producer in varied environments and sediment-stabilizer and -binder of reefal fades. 3.Calci-microbes flourished especially in several geologic periods of decline and demise of metazoan reef-builders(e.g., Permo-Triassic boundary interval, Late Carboniferous prolonged and severe icehouse climate) and played a significant role as rock-forming biotas in these environment-devastated periods. 4.Various types of calci-microbial reefal facies and related organo-sedimentary structures were reported from shallow-marine carbonate sediments of many geologic ages. These microbial sediments are considered as having built up small-scale topographic highs of reefa facies, along with submarine cements. Our results suggest that geochemical approaches needed in order to more thoroughly and quantitatively delineate temporal changes of environmental factors(temperatures, salinity, atmospheric CO_2 pressure, sea-level fluctuation, etc) in relation to flourish of calci-microbes. Some investigators of our research project have already begun hew researches with this aim.
Precise reconstruction of sea surface temperature for the last 10,000 years based on skeletal records of hermatypic corals.

IRYU Yasufumi, MATSUDA Hiroki, MATSUDA Shinya, OMURA Akio, SUGIHARA Kaoru, YAMADA Tsutomu

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2000 - 2002

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Intensive investigations have been conducted on skeletal records of hermatypic corals from Kikai-jima and Guam. They have led to the following two conclusions. 1. We collected fossil hermatypic corals from the Holocene terraces on Kikai-jima, nor them Ruckus. The corals have net been diagenetically altered. Coral δ^<18>(δ^<18>) indicates that sea surface temperature (SST) were equal to or somewhat cooler than the present (25.4℃) during 6.3-8.1 ka in Kikai-jima and that it was lower than the present by 3℃ and 1℃ during 3.1-6.3 ka and 1.4-3.1 ka, respectivety. 2. We have examined skeletal records in a 213-year coral core (Porites lodata), GD2, from Double Reef, Guam. δ^<18>O_<coral> shows seasonal fluctuations with small amplitudes of 0.23-0.57%_o (VPDB) for the years 1980-2000. A stronger statistical relationship exists between SST and δ^<18>O_<coral> for El Nino years (γ=-0.81) and non-ENSO years (El Nino/Southern Oscillation) (γ=-0.66) than for La Nina years (γ=-0.48). These different statistical relationships are a manifestation of changes in the winter season SST and changes in seawater δ^<18>O (δ^<18>O_<sw>) during El Nino (<27℃) versus la Nina periods (>21℃) at Guam, which reflects the migration of Western Pacific Warm Pool (WPWP). In the winter season of EI Nino periods, Guam Island is surrounded by a relatively low SST and high SSS water mass due to eastward migration of WPWP, which is recorded in GD2 as a relatively Large amplitude of seasonal SST and positive anomalies δ^<18>O_<sw>. In contrast, in the winter season of La Nina periods, SST exceeds 28℃ and SSS becomes greater by increases in evaporation and decreases in precipitation due to the westward migration of WPWP. These changes result in much smaller changes in seasonal SST foe La Nina periods El Nino periods to El Nino periods and in positive δ^<18>O_<sw> anomalies.
Study on paleoenvironmental changes recorded in the calcareous-siliceous sediments since ha last glacial maimum

ODA Motoyoshi, IRYU Yasufumi, XU Xeudong, IWASAKI Yasuhide, MATSUDA Hiroki

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (A)

Institution: Kumamoto University

1996 - 1998

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Planktic foraminiferal assemblages in 81 sea surface sediments from the Northwest Pacific Ocean were used to create ecological equations between foraminiferal abundaince variations and the present day surface water conditions near Japan. Principal factor analysis yielded five factors correlated with modern water masses : Kuroshio factor, Transitional Water factor, Oyashio factor, Kuroshio Gyre Margin factor and Coastal Water factor. These factors account for over 94% of the total variance (Takemoto & Oda, 1997). Furthermore, regression analysis produced transfer functions PFJ-125 relating observed winter and summer SST.The standard errors averaged about 1.75 degree (C) for winter SST, 1.l7 degree (C) for summer SST.PFJ-l25 were applied to planktic foraminiferal assemblages in seven cores obtained from the Kuroshio Region and two from Perturbed Area. These cores were dated by AMSl4C method. Factors and estimated SST indicate variations of the axis of the Kuroshio near Japan since 21k yrs. B.P. Furthermore, planktic foraminifera have been studied in two high-resolution AMS14C dated cores raised from the eastern East China Sea (ECS) in order to reconstruct the surface water history over the last 20,000 years. Three distinctively different planktic foraminiferal assemblages corresponding to the last glacial, deglacial and postglacial stages are recognized. The assemblage during the deglacial stage represented by high % frequency occurrence of G.quinqueloba and N.paclyderma (d) is quite different from those during the glacial and postglacial stages, showing unique character of the surface water environments during the last deglaciation : severely diluted and well stratified. The species association change indicates higher surface temperature and lower surface primary productivity during the postglacial stage than during the last glacial stage, and that the formation of the postglacial surface water circulation pattern in the eastern ECS was closely related to the flow of the Kuroshio current. In addition, planktic foraminiferal assemblages in sea surface sediments from Sea of Japan are also analyzed to get the basic data between foraminiferal abundance variations and the present day surface water condition. Core recovered from mid of Sea of Japan was also dated by AMS 14C method. To clarify the influence and time scale of early meteoric diagenesis on isotopic compositions of carbonate sediments, carbonate mineral compositions and values of 6 13C and 6 180 of the Holocene to Pleistocene carbonate sediments of the Ryukyuu Islands were analyzed. The data indicate that diagenetic alternation on mineral and isotopic compositions are within 4,000 yrs. after the deposition, and that serious changes of delta 13C and delta 18O from primary values occur within about a few ten thousand yrs. by early meteoric diagenesis. This suggested that the influence of meteoric diagenesis should not be ignored even if the sediments were deposoted only a few thousand years age, and that it is very important to carry out careful selections of samples and/or evaluations of data.
第8回化石クニダリア・海綿国際会議の講演会及び野外巡検の企画

森啓, 大村明雄, 堀信行, 井龍康文, 川村寿郎, 中森享

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 基盤研究(C)

Institution: 東北大学

1997 - 1997

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平成11年(1999年)9月12日〜16日の5日間,仙台国際センターで開催される第8回化石クニダリア・海綿国際会議の講演会の日程とその内容及び会議前後に行う野外巡検について検討を行った。その具体的内容は以下の通りである。 1.会議・開催についての1st Circularを印刷し,会員に郵送した. 2.基調講演は加藤誠北大名誉教授に依頼することとした. 3.「21世紀にむけての化石クリダリア・海綿研究の展望」をテーマとする特別シンポジウムを行うこととした.コンビナ-として現会長ロドリゲス教授に打診することとした.講演者は10名(6名が30分,4名が15分の講演を行う)で,総合討論を30分とした. 4.半日のセッションテーマとして,(1)環太平洋の化石サンゴ礁,(2)化石クニダリア・海綿からみた礁の進化,(3)クニダリアの種分化,(4)サンゴ・海綿に記録された石気候,(5)サンゴ群集の地史的変遷,(6)サンゴ.海綿の微細構造,が候補としてあげられ一つひとつ議論したが,今後外国の研究者とも連絡をとりながら決定することとした.なお新たなセッションテーマを募り,2nd Circular及びニュースレターで全会員に周知させることとした. 5.わが国の大学に収蔵されているクニダリア・海綿のタイプ標本をもちよって検鐘しながら討論を行うワークショップを開催することとした. 6.わが国の巡検候補地を,(1)沖縄本島,(2)秋吉,(3)北上山地に決定し,それぞれの日程,見学露頭,費用等について検討した.なお各コースの見学地の下見を行った.
Thallus reconstruction of nongeniculate coralline algae (Corallinales, Rhodophyta)

IRYU Yasufumi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: (Institute of Geology and Paleontology, Graduate School of Science) Tohoku University

1996 - 1997

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Reconstruction of nongeniculate coralline algal thalli was investigated. Horizontal and vertical scars were artificially given on the branch tips of Lithophyllum pallescens growing as up to boulder-sized nodules in Kabira Cove, Ishigaki-jima, Ryukyu Islands. Time-series observations on the course of the recovery of scars have revealed followings. (1) When the horizontal scars were given, in most cases, those cells located several-cell-layrs beneath the broken cells became meristem cells that produced new epithallial cells outwardly and vegetative cells inwardly. Then the dead cells above the new epithallial cells were sloughed off. Rarely new tissues were generated from undamaged parts encircling the scars ; the scars were recovered by subsequent lateral growths of the new tissues. (2) In the case of the reconstruction of vertical scars, new cells were formed at the edges, sides, and bottoms of scars. Newly-formed tissues are dimerous at the edges and sides, while those at the bottoms are monomerous or dimerous. These results demonstrate that coralline algal thalli possess excellent capability of recovering scars by herbivores and that epithallial cells play positive role for sloughing off dead parts of coralline algal thallus, although they have been regarded as those cells terminating filaments or having a function for removing harmful objects such as other algal spores by sloughing.
Evolution of ahermatypic scleractinian corals from marine caves.

MORI Kei, IRYU Yasufumi, NAKAMORI Toru

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: Tohoku University

1996 - 1997

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Seven species belonging to six genera have been found in the marine caves mainly from the Ryukyu Islands. Among them, one new genus and four new species are propsed, viz. Madracis sp.nov., Desmophyllum cristagalli Milne-Edwards and Haime, Polycyathus sp.nov., Paracyathus pruinosus Alcock, Dendrophyllia sp.nov., Dendrophyllia elegans Horst and Pectiniidae gen.et sp.nov. The assemblages are characteristic, being different from those of ahermatypic scleractinians hitherto reported from the Ryukyu Islands. Morphology of the coralla in some species is also peculiar, reflecting the cryptic environments of the marine caves. For example, the coralla of Madracis sp.nov.are massive and very small, while they are generally ramose in open marine environments. In the classification of scleractinian corals, solitary corals have been discriminated from colonial ones in generic level. However, solitary and colonial coralla, both of which possess same calices coexist in the genus Desmophyllum.
Reef growth and the Late Holocene climatic change recorded in the Raised Coral Reef in Kikai-jima Islands, Ryukyu, Japan.

NAKAMORI Toru, IRYU Yasufumi, MATSUDA Shinya, OMURA Akio, OTA Yoko

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

1996 - 1997

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Field surveys on the Holocene Raised Coral Reef and present coral reefs around Shido-oke in the northern coast of Kikai-jima Island, Ryukyus, southwest Japan were carried out in 1996 and 1997. Six core samples (T-1-T-6) ranging from 2.44 to 3.99 min length and 5 cm in diameter were obtained by using hand corer which was equipped by this Grant. on the Terraces II to IV.Tabular and encrusting Acropora, such as A.hyacinthus, A.digitifera, A.gemmifera, and A.monticulosa predominate in the hermatypic coral assemblages. Species combination indicates that the all cores were deposited in the shallow marine environments from 0 to 10 min depth. Skeletons of the living Porites spp., Tridacna spp. and sea water samples were collected from every 5 m from 0 to 30 min depth on the reef slope off Shido-oke. SoftX-ray photos of the living and Holocene coral slabs were taken in the laboratory and the annual growth bands were studied to date the samples. The living (KS01-09) sample was taken from 9 min depth. Useries age of the fossil sample (1805) is 9.2 ka after Ota et al.(1998). Carbon and oxygen stable isotope ratios of the coral skeleton were measured by the mass spectrometry. Present sea surface temperature (SST) and monthly mean salinity around Kikai-jima Island are reconstructed from IGOSS SST data and 1ﾟ mesh salinity data of JODC,respectively. Paleo- and present SSTs around Kikai-jima were estimated according to the oxygen isotope anomaly model including the vital effects and the ice sheet size. It predicts that-the present mean SST is 21.9ﾟC,2.6ﾟC lower than the actually measured data. Early Holocene mean SST was also estimated to be 22.0ﾟC,which is discordant with the results calculated on the transfer function..
Study on database of fossil ; type specimens

MORI Kei, SASAKI Osamu, IRYU Yasufumi, SHIMAMOTO Masanori, NAKAMORI Toru

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

1994 - 1996

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The purpose of the present study is to create a database of fossil and Recent type specimens stored in the Institute of Geology and Paleontology, Tohoku University. Totally 3856 pelecypod and 3000 scleractinian coral speciments have been recorded. Among them, 362 specimens are associated with pictures. Data in each specimen include : registration number, generic name, specific name, author, date, formation, occurrence, geologic age, place of storage and reference.
北大東島試錐試料および表層試料の堆積学的・地球化学的分析による堆積史の高精度解析

井龍康文

Offer Organization: 日本学術振興会

System: 科学研究費助成事業

Category: 奨励研究(A)

Institution: 東北大学

1995 - 1995

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北大東島で掘られたボーリングコアに認められる炭酸塩岩を4つの層位学的単位(Unit 1,鮮新世;Unit 2,中新世後期;Unit 2,中期中新世(約15-16Ma);Unit 4,後期漸新世から前期中新世(19-25Ma))に,地表に露出した炭酸塩岩を3つの単位(下位よりS1,S2,S3)に区分し,以下のような地史を考察した. 北大東島はフィリピン海プレート上の島であり,島を構成するサンゴ礁の堆積史は,プレートの水平方向への移動とそれにともなう上下方向の変動によって決定されてきた.漸新世から現在まで,プレートが北北東に5.4cm/年の速さで移動したと仮定すると,漸新世後期(25Ma)には北大東島は北緯17°付近に位置していたと推定される.また,島は25Maからおよそ2Maまで400m以上沈降し続けたが,それ以降はlithospheric bulgeに到達したことにより隆起に転じた.その後,0.03-0.05m/kaの速度で隆起し,現在までに約100mほど上昇したと考えられている. サンゴ礁の形態は,漸新世後期(25Ma)から中新世後期(5.3Ma)にかけての時期には,礁湖の堆積物が島の中心部で見い出されていることから,環礁であったと考えられる.一方,Unit 1を作った礁は,同じ場所から礁斜面の堆積物が得られているため,卓礁あるいは小規模な礁の集合体とであったと推定される.サンゴ礁の形態のこのような変化は,礁の北上にともなって海水温が低下し,礁の生産量が徐々に減少して,礁の規模が小さくなっていく過程を見ている可能性がある.S1が堆積した時期には,逆に,礁の形態は卓礁から環礁へと変化した.これは,礁の沈降速度が緩やかになったとき,あるいは,上昇に転じたときに,礁が側方にも成長して,再び環礁を形成したことを示唆している可能性がある.最後に,島が海面上に露出し,それ以降は小規模な裾礁が高海水準時に形成されるのみとなった.以上のように,北大東島を造るサンゴ礁は,島の沈降と隆起の歴史を反映して,さまざまな形態のものが生成・消滅を繰り返してきたと考えられる.
Geoarchaeological researches on building stone used by ancient Egyptians Competitive

System: Grant-in-Aid for Scientific Research

1993/04 - 1993/12

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Social Activities 3

北大東島人材交流センター，南大東島エコミュージアムの展示

2001/04 - Present

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北大東島人材交流センターおよび南大東島エコミュージアムの地形・地質の展示を監修
総合国際深海掘削計画(IODP)第310次航海「タヒチ島の海水準」の実施

2005/09/25 -
相馬高校スーパーサイエンススクール授業

2004/08/26 -

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地球科学分野における世界の最先端の研究紹介

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巨大鍾乳洞～日本列島誕生の秘密～

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2013/09/16

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ハワイ諸島沖の沈水サンゴ礁堆積物に関する研究

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本研究では，以下の4つの目的を達成するために，ハワイ諸島沖の水深約110〜1200mにみられる8つ時期に形成されたと推定される沈水サンゴ礁堆積物を掘削することを目指している． 1. 過去50万年間の海水準変動を正確に描き出し，海水準変動とミランコビッチサイクルやダンスガード・オシュッガーサイクルとの関連を明確にする． 2. サンゴのプロキシデータを用いて過去50万年間の長期〜短期の気候変動のプロセスを描き出す． 3. 急激な海水準上昇に対するサンゴ礁およびサンゴ礁生態系の応答を明らかにする． 4. ハワイ諸島における沈降量の時空分布を捉え，同諸島の火山活動史を理解する．
日本周辺海域の海山から採取された炭酸塩岩の堆積学的・地球化学的研究に基づく礁／炭酸塩プラットフォームの成立・発達・沈水過程に関する研究

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大水深域における石油資源等の探査技術等基礎調査により，日本周辺海域の海山から採取された炭酸塩岩について，堆積学的・地球化学的検討を実施し，それらの結果に基づいて，礁／炭酸塩プラットフォームの成立・発達・沈水過程を描き出す．
日本周辺海域の海山から採取された炭酸塩岩の堆積学的・地球化学的研究に基づく礁／炭酸塩プラットフォームの形成史に関する研究

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大水深域における石油資源等の探査技術等基礎調査により，日本周辺海域の海山から採取された炭酸塩岩について，堆積学的・地球化学的検討を実施し，それらの結果に基づいて，礁／炭酸塩プラットフォームの成立・発達・沈水過程を描き出す．
地球化学的・結晶化学的手法に基づく環礁性ドロマイトの成因に関する研究

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地球化学および結晶化学的手法に基づいて，北大東島の地表から地下100mの範囲に分布するドロマイトの起源と成因を明らかにする．これによって，環礁性ドロマイトの起源と成因が明確になると期待される．また，北大東島のドロマイトには複数の晶出履歴が認められるので，個々のドロマイトの地球化学および結晶化学的特徴を識別する手法を開発することも，本研究の目的の一つである．
IODP Expedition 310タヒチ島のサンゴ礁掘削に基づく過去20,000年間の海水準変化およびそれに対するサンゴ礁の応答

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国際統合深海掘削計画第310次航海（タヒチ島の海水準変動）の共同主席研究者として，研究を推進中である．本航海は，40年近くにおよぶ深海掘削計画史上初のサンゴ礁掘削であり，炭酸塩堆積学・地球化学の分野における記念碑的なプロジェクトである．本航海の主目的は，以下の3項目である． (1) 23,000年前の最終氷期最寒期以降の海水準の上昇過程を復元するとともに，海水準の上昇に伴って、海洋表層の海水温変化を復元すること． (2) 気候変動と海面変動が、サンゴ礁の発達に与えた影響を解明すること． (3) 最終氷期最寒期以降の短周期海洋環境変動（ENSO等）を復元すること．
無節サンゴモ化石の古生物学的研究

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無節サンゴモ（紅藻類サンゴモ科）は，新生代のサンゴ礁において，サンゴに次ぐ重要な造礁生物である．それらの群落組成は，新生代中に大きな変化をとげた．しかし，群落変遷の具体的過程は，必ずしも詳細に理解されているわけではない．本研究は，この問題を解決するための第一のステップとして，本邦において保存の良い無節サンゴモ化石が入手可能な，中新世以降の礁性堆積物中の無節サンゴモの群落組成を詳細に検討し，熱帯性無節サンゴモ（紅藻類サンゴモ科）群落の成立過程を明らかにすることを目的とするものである．
シャコガイ殻の成長線・同位体比・金属元素濃度変化を用いた高精度環境復元

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近年，サンゴ骨格を用いた過去の表層海水温の推定に関する研究が数多く行われている．しかし，サンゴ骨格の化学組成は死後の化石化の過程で（続成作用によって）比較的容易に変化するため，環境情報が改変されてしまうことが多い．したがって，過去の表層海水温を推定するための新たな手段の開発の必要性が高まってきている．シャコガイの殻はサンゴの骨格に比べ密であるため，続成作用の影響を受けにくく，新たな手段として有望であると考えられる．本研究の目的は，シャコガイ殻の成長線，炭素・酸素同位体比，金属元素濃度の変化を用いて，過去の海洋表層の環境および過去の日射量を復元するための手法を開発することである．手法開発のためには，現生のシャコガイ殻を用いて，生息環境（水温，塩分，日射量，海水の化学・同位体組成）と殻の化学・同位体組成および成長量との間の関係を明らかにする．
グアム島のサンゴ骨格に記録された海洋環境変動

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熱帯浅海域に広く生息する造礁サンゴ骨格の成長量，炭素・酸素同位体比，金属元素濃度は，過去の海洋環境を復元するために非常に有用な指標であるとされている．そこで，本研究では，グアム島北西岸に位置する”ダブルリーフ”に生息する造礁サンゴ群体（Porites lobata）から採取した全長約270 cmの骨格コア試料（西暦1878〜2000年の骨格記録）の骨格記録の抽出と解析を行う．
ニウエ島の造礁サンゴ化石に記録された新第三紀および第四紀の海洋環境に関する研究

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南太平洋の隆起環礁であるニウエ島で採取された鮮新世および更新世の造礁サンゴ化石の骨格記録の抽出と解析を行い，両時期におけるニウエ島周辺海域の表層水温の復元を試みる．本研究で用いる化石サンゴ試料は同位体比や金属濃度記録から古環境復元を行うものとしては非常に時代が古く，化石サンゴ骨格による古環境復元の限界に対する一つの指標となると期待される．
琉球列島におけるサンゴ礁前線の移動：北西太平洋における第四紀気候変動に対する高緯度礁の応答 (COREF Project)

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COREF Projectは，北西太平洋におけるサンゴ礁の分布の北限に位置する琉球列島において，第四紀気候変動に対するサンゴ礁生態系の応答を明確にすることを主目的とするプロジェクトである．このプロジェクトの科学目的の達成のために，IODPによる海洋掘削とICDPによる陸上掘削により第四紀サンゴ複合体堆積物およびその沖合堆積物を採取することを目指している．
北大東島ボーリング試料の再検討

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北大東島試錐試料に関する地質学・堆積学・地球化学研究成果をまとめ，過去2,500万年間のサンゴ礁の形成発達史を描き出す．また，本ボーリングは戦前に行われた先駆的事業であったにもかかわらず，これまで成果が欧文で出版されていないため，その学術的価値が（特に海外で）過少に評価されてきた面があり，これを打開することも副次的目標のひとつである．
始新世礁堆積物中の無節サンゴモの群落組成に関する研究

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無節サンゴモ（紅藻類サンゴモ科）は，新生代のサンゴ礁において，サンゴに次ぐ重要な造礁生物である．それらの群落組成は，新生代中に大きな変化をとげた．しかし，群落変遷の具体的過程は，必ずしも詳細に理解されているわけではない．申請者はこの問題を解決するために各地質時代の無節サンゴモ群落を検討中である．本研究は，その一環として，日本に分布する始新世石灰岩に含まれる無節サンゴモについて分類学的・古生態学的研究を行うことを目的とする．本邦では小笠原諸島母島および沖縄県石垣島に鮮新世のサンゴ礁性堆積物礁が分布しており，保存のよい無節サンゴモ化石が含まれていので，それらを多数採取し，群落組成および各種の礁内分布を明らかにする．
鮮新世熱帯性無節サンゴモ（紅藻類サンゴモ科）の群落組成に関する研究

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無節サンゴモ（紅藻類サンゴモ科）は，新生代のサンゴ礁において，サンゴに次ぐ重要な造礁生物である．それらの群落組成は，新生代中に大きな変化をとげた．しかし，群落変遷の具体的過程は，必ずしも詳細に理解されているわけではない．申請者はこの問題を解決するために各地質時代の無節サンゴモ群落を検討中である．本研究は，その一環として，現在世界的にデータの欠落している鮮新世の無節サンゴモの群落組成を明らかにすることを目的とするものである．本邦では沖縄県北大東島に鮮新世のサンゴ礁性堆積物礁が分布しており，保存のよい無節サンゴモ化石が含まれていので，それらを多数採取し，群落組成および各種の礁内分布を明らかにする．
エジプト遺跡調査

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アブシール南丘陵遺跡とルクソール王家の谷・西の谷調査（石材の由来など）
北大東島試錐試料および表層試料に基づく堆積史の高精度解析

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本研究は北大東島の試錐試料および表層試料に関する堆積学的，古生物学的，地球化学的研究から，テクトニクス，海水準変動，気候および海洋環境の変化などの地球環境変遷に関する情報を抽出する．
国際ワークショップ“Reefs and Carbonate Platforms of the Pacific and Indian Oceans”

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シドニー大学Peter J. Davies教授の主催する大平洋およびインド洋の礁・炭酸塩プラットフォームに関するワークショップに参加し，琉球列島に分布する第四紀更新世のサンゴ礁複合体堆積物である琉球層群の岩相，堆積相，年代を紹介する．

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