TOHOKU UNIVERSITY Researchers

Details of the Researcher

Home

日本語 English

Reishi Takashima

Section

The Center for Academic Resources and Archives

Job title

Professor

Degree

博士（理学）（東北大学）
修士（理学）（東北大学）

researchmap

https://researchmap.jp/read0155080

J-GLOBAL ID

201101090679836558

Committee Memberships 4

仙台市文化財保護審議会　委員

2021/04 - Present
Geological Society of Japan　executive director

2020/04 - Present
地質標準化委員会　委員

2011/04 - 2012/03
ICDP陸上掘削部会　国内委員

2010/04 - 2012/03

Professional Memberships 4

Paleosciences Society

2018/04 - Present
Geological Society of America
日本古生物学会
日本地質学会

Research Interests 2

Geology
Stratigraphy

Research Areas 1

Natural sciences / Biogeoscience /

Papers 107

First evidence of the Lower Cretaceous Weissert Event in the Northwestern Panthalassa: carbon isotope stratigraphy and U–Pb radiometric ages of the Somanakamura Group in Northeastern Japan Peer-reviewed

Tomaru T., Takashima R., Orihashi Y., Yamanaka T., Ando H., Asahara Y., Nishi H., Kuroyanagi A., Otsubo T.

Newsletters on Stratigraphy　58　(2)　219-238　2025/06/21
Publisher: Schweizerbart
DOI： 10.1127/nos/2025/0868 　

ISSN： 0078-0421
Diatom and Radiolarian Biostratigraphy in the Vicinity of the 2011 Tohoku Earthquake Source Fault in IODP Hole 343‐C0019E of JFAST Peer-reviewed

Masao Iwai, Isao Motoyama, Weiren Lin, Reishi Takashima, Yasuhiro Yamada, Nobuhisa Eguchi

Island Arc　2025/01

DOI： 10.1111/iar.70009 　
Radioisotopic chronology of Ocean Anoxic Event 1a: Framework for analysis of driving mechanisms Peer-reviewed

Youjuan Li, Brad S. Singer, Reishi Takashima, Mark D. Schmitz, Luca G. Podrecca, Bradley B. Sageman, David Selby, Toshiro Yamanaka, Michael T. Mohr, Keiichi Hayashi, Taiga Tomaru, Katarina Savatic

Science Advances　2024/11/22

DOI： 10.1126/sciadv.adn8365 　
Geology and geography of the Matsushima Bay area: Geologic and topographic history of the fore-arc region of NE Japan from the Miocene opening of the Sea of Japan to the present Peer-reviewed

Reishi Takashima

The Journal of the Geological Society of Japan　130　(1)　259-277　2024/07/13
Publisher: The Geological Society of Japan
DOI： 10.5575/geosoc.2024.0017 　

ISSN： 0016-7630

eISSN： 1349-9963
Geology and landscape of Matsushima Invited

Reishi Takashima

Daichi　64　(3)　2-9　2024/03
Large igneous province activity drives oceanic anoxic event 2 environmental change across eastern Asia Peer-reviewed

R. Takashima, D. Selby, T. Yamanaka, Y. Kuwahara, H. Nakamura, K. Sawada, M. A. Ikeda, T. Ando, K. Hayashi, M. Nishida, T. Usami, D. Kameyama, H. Nishi, A. Kuroyanagi, B. R. Gyawali

Communications Earth & Environment　5　(1)　2024/02/19
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s43247-024-01214-z 　

eISSN： 2662-4435

More details Close

Abstract During mid-Cretaceous Oceanic Anoxic Event 2, significant increase of atmospheric carbon dioxide concentrations from the eruption of the large igneous provinces is hypothesized to have induced a humid climate and an elevation in nutrient runoff from continents to the oceans, resulting in oxygen depletion in the ocean. However, hitherto there is limited insight into the driving factors of Oceanic Anoxic Event 2 from the Pacific and Asian continental margins, even though the former and the latter were the largest ocean and landmass at that time. Here, a multiproxy analysis for the Oceanic Anoxic Event 2 interval of the Yezo Group –deposited on northwestern Pacific along the active Asian continental margin– is interpretated to identify seven volcanic pulses, five of which may have elevated humidity, weathering intensity, and vegetational change in the eastern margin of Asia. Moreover, oxygen depletion occurred simultaneously in the northwest Pacific. Given that these environmental changes in the eastern margin of Asia were penecontemporaneous with the global carbon burial intervals during Oceanic Anoxic Event 2, the elevated nutrient supply from the Asian continental margin to the Pacific Ocean may have, in part, contributed to the worldwide depletion of oxygen of the ocean during Oceanic Anoxic Event 2.
Evaluation of fossil geomacromolecular sources by the pyrolysis of density fractions of kerogens from Cretaceous and Miocene organic-rich marine shales

Gen Sakugawa, Masashi A. Ikeda, Takuto Ando, Reishi Takashima, Hiroshi Nishi, Ken Sawada

GEOCHEMICAL JOURNAL　58　(4)　138-154　2024
Publisher: Geochemical Society of Japan
DOI： 10.2343/geochemj.gj24012 　

ISSN： 0016-7002

eISSN： 1880-5973
Correlation of tuffs intercalated in the Pliocene Mukaiyama Formation, Sendai area, Japan, based on apatite trace element compositions Peer-reviewed

Haruka Kusakawa, Reishi Takashima

The Journal of the Geological Society of Japan　129　(1)　389-404　2023/08/09
Publisher: The Geological Society of Japan
DOI： 10.5575/geosoc.2023.0005 　

ISSN： 0016-7630

eISSN： 1349-9963
Marine paleoecological variations during the mid-Cretaceous oceanic anoxic event 1a in the Vocontian Basin, southeastern France

Takuto Ando, Ken Sawada, Kazuki Okano, Reishi Takashima, Hiroshi Nishi

Palaeogeography, Palaeoclimatology, Palaeoecology　586　110779-110779　2022/01
Publisher: Elsevier BV
DOI： 10.1016/j.palaeo.2021.110779 　

ISSN： 0031-0182
Decrease in volume and density of foraminiferal shells with progressing ocean acidification

Azumi Kuroyanagi, Takahiro Irie, Shunichi Kinoshita, Hodaka Kawahata, Atsushi Suzuki, Hiroshi Nishi, Osamu Sasaki, Reishi Takashima, Kazuhiko Fujita

Scientific Reports　11　(1)　2021/12
Publisher: Springer Science and Business Media LLC
DOI： 10.1038/s41598-021-99427-1 　

eISSN： 2045-2322

More details Close

<title>Abstract</title>Rapid increases in anthropogenic atmospheric CO₂ partial pressure have led to a decrease in the pH of seawater. Calcifying organisms generally respond negatively to ocean acidification. Foraminifera are one of the major carbonate producers in the ocean; however, whether calcification reduction by ocean acidification affects either foraminiferal shell volume or density, or both, has yet to be investigated. In this study, we cultured asexually reproducing specimens of <italic>Amphisorus kudakajimensis,</italic> a dinoflagellate endosymbiont-bearing large benthic foraminifera (LBF), under different pH conditions (pH 7.7–8.3, NBS scale). The results suggest that changes in seawater pH would affect not only the quantity (i.e., shell volume) but also the quality (i.e., shell density) of foraminiferal calcification. We proposed that pH and temperature affect these growth parameters differently because (1) they have differences in the contribution to the calcification process (e.g., Ca²⁺-ATPase and Ω) and (2) pH mainly affects calcification and temperature mainly affects photosynthesis. Our findings also suggest that, under the IPCC RCP8.5 scenario, both ocean acidification and warming will have a significant impact on reef foraminiferal carbonate production by the end of this century, even in the tropics.
Identification of the source caldera for the Middle Miocene ash-flow tuffs in the Kii Peninsula based on apatite trace-element composition Peer-reviewed

Reishi Takashima, Hiroyuki Hoshi, Yutaka Wada, Hironao Shinjoe

ISLAND ARC　30　(1)　2021/04

DOI： 10.1111/iar.12404 　

ISSN： 1038-4871

eISSN： 1440-1738
Identification of source area of stone material for the Baji Museum, Takekoma Shrine based on trace-element chemistry of apatite, and its significance in the architectural history. Peer-reviewed

Reishi Takashim, Hiromichi Saito

Bull. Tohoku Univ. Museum　(20)　9-20　2021/03
Carbon isotope chemostratigraphy and conodont biostratigraphy around the Smithian–Spathian boundary in the Panthalassan carbonate succession (SW Japan) Peer-reviewed

Takumi Maekawa, Toshifumi Komatsu, Yasunari Shigeta, Reishi Takashima, Tatsuhiko Yamaguchi

Journal of Asian Earth Sciences　205　104570-104570　2021/01
Publisher: Elsevier BV
DOI： 10.1016/j.jseaes.2020.104570 　

ISSN： 1367-9120
What drove the evolutionary trend of planktic foraminifers during the Cretaceous: Oceanic Anoxic Events (OAEs) directly affected it? Peer-reviewed

Azumi Kuroyanagi, Hodaka Kawahata, Kazumi Ozaki, Atsushi Suzuki, Hiroshi Nishi, Reishi Takashima

Marine Micropaleontology　161　2020/12

DOI： 10.1016/j.marmicro.2020.101924 　

ISSN： 0377-8398
Changes in upper ocean hydrography and productivity across the Middle Eocene Climatic Optimum: Local insights and global implications from the Northwest Atlantic Peer-reviewed

Jun Arimoto, Hiroshi Nishi, Azumi Kuroyanagi, Reishi Takashima, Hiroki Matsui, Minoru Ikehara

Global and Planetary Change　193　103258-103258　2020/10
Publisher: Elsevier BV
DOI： 10.1016/j.gloplacha.2020.103258 　

ISSN： 0921-8181
Identification of the source caldera for a Pliocene ash-flow tuff in Northeast Japan based on apatite trace-element compositions and zircon U-Pb ages Peer-reviewed

Reishi Takashima, Haruka Kusakawa, Sato Kuwabara, Yuji Orihashi, Hiroshi Nishi, Michio Niwano, Takeyoshi Yoshida

Journal of Volcanology and Geothermal Research　401　2020/09/01

DOI： 10.1016/j.jvolgeores.2020.106948 　

ISSN： 0377-0273
Late Cenozoic Igneous Activity and Crustal Structure in the NE Japan Arc: Background of Inland Earthquake Activity Peer-reviewed

Takeyoshi Yoshida, Reishi Takashima, Takeshi Kudo, Oky Dicky Ardiansyah Prima, Sumire Maeda, Keisuke Yoshida, Tomomi Okada, Satoshi Miura, Tomohiro Takahashi, Yoshitaka Nagahashi, Kyoko Kataoka

JOURNAL OF GEOGRAPHY-CHIGAKU ZASSHI　129　(4)　529-563　2020/08

DOI： 10.5026/jgeography.129.529 　

ISSN： 0022-135X

eISSN： 1884-0884
A study on the tuffs used in historical buildings on Katahira campus, Tohoku University Peer-reviewed

Takahiro Uchiyama, Reishi Takashima

Bulletin of the Tohoku University Museum　(19)　39-50　2020/03
The Kellwasser Events in the Upper Devonian Xom Nha Formation, Central Vietnam Peer-reviewed

Ryo Matsuo, Toshifumi Komatsu, Hiroki Matsuda, Takumi Maekawa, Toshitaka Inada, Reishi Takashima, Toshihiro Yamada, Mark Williams, Phong Duc Nguyen, Hung Dinh Doan, Hung Ba Nguyen, Minh Trung Nguyen

Journal of the Sedimentological Society of Japan　78　(2)　55-75　2020/02/25
Publisher: The Sedimentological Society of Japan
DOI： 10.4096/jssj.78.55 　

ISSN： 1342-310X

eISSN： 1882-9457

More details Close

The Frasnian-Famennian (F-F) boundary occurs within the Upper Devonian Xom Nha Formation in Quang Binh Province, Central Vietnam. The stratotype section of the Xom Nha Formation (bed numbers Xo 1-39) comprises carbonates, and is divided into Unit I (Xo 1-13) mainly composed of whitish-gray bioclastic grainstone and wackestone, Unit II (Xo 14-28) dominated by bioclastic packstone and wackestone, and Unit III (Xo 29-39) characterized by weakly parallel laminated gray to dark gray lime-mudstone. Units I-III commonly contain well-preserved conodonts and ostracods. Some horizons of Unit II yield brachiopods, ammonoids, nautiloids, bivalves, tentaculitoids, crinoids and acritarchs. Age diagnostic conodont species of the Frasnian Palmatolepis linguiformis is commonly obtained from the upper part of Unit II. Unit III yields Pa. delicatula that is characteristic of the lowermost Famennian Pa. triangularis conodont Biozone. Two positive carbon isotope excursions are recognized, the lower excursion peaking in Unit I whilst the upper excursion peaks just below the local Frasnian-Famennian boundary (bed number Xo 28). Based on the biostratigraphy, these excursions equate to the Lower and Upper Kellwasser events. In the upper part of Unit II (Pa. linguiformis Biozone, bed numbers Xo 16-23), relatively diverse marine assemblages are recognized, indicating a temporal recovery of ecosystem after the Lower Kellwasser Event. By contrast, the diversity of lowermost Famennian marine organisms decreased markedly after the Upper Kellwasser event.
Variations in trace elements, isotopes, and organic geochemistry during the Hangenberg Crisis, Devonian–Carboniferous transition, northeastern Vietnam Peer-reviewed

Atena Shizuya, Masahiro Oba, Takuto Ando, Yukari Ogata, Reishi Takashima, Hiroshi Nishi, Toshifumi Komatsu, Phong D. Nguyen

Island Arc　29　(1)　2020/01/01

DOI： 10.1111/iar.12337 　

ISSN： 1038-4871

eISSN： 1440-1738
Preliminary tephrochronological study of the Yezo Group (uppermost Albian–basal Campanian) in north Japan Peer-reviewed

Sato Kuwabara, Reishi Takashima, Yuji Orihashi, Hiroshi Nishi, Takafumi Satoh, Keiichi Hayashi

Cretaceous Research　103　104158-104158　2019/11
Publisher: Elsevier BV
DOI： 10.1016/j.cretres.2019.06.004 　

ISSN： 0195-6671
Establishment of upper Cretaceous bio- and carbon isotope stratigraphy in the northwest Pacific Ocean and radiometric ages around the Albian/Cenomanian, Coniacian/Santonian and Santonian/Campanian boundaries Peer-reviewed

Reishi Takashima, Hiroshi Nishi, Toshiro Yamanaka, Yuji Orihashi, Yasuyuki Tsujino, Xavier Quidelleur, Keiichi Hayashi, Ken Sawada, Hideto Nakamura, Takuto Ando

Newsletters on Stratigraphy　52　(3)　341-376　2019/06

DOI： 10.1127/nos/2019/0472 　

ISSN： 0078-0421

eISSN： 2363-6122
Cretaceous radiolarian biostratigraphy in the yezo group, Hokkaido, Northeast Japan Peer-reviewed

Hiromichi Koyasu, Hiroshi Nishi, Reishi Takashima, Noritoshi Suzuki

Newsletters on Stratigraphy　52　(3)　297-319　2019/06
Publisher: Schweizerbart
DOI： 10.1127/nos/2018/0357 　

ISSN： 0078-0421
An attempt to create a three dimensional terrain model of affected area using drone : Taking the topography of the collapsed zone as an example Peer-reviewed

渡邊圭, 庭野道夫, 山口政人, 鹿納晴尚, 高嶋礼詩

感性福祉研究所年報 = Report of Kansei Fukushi Research Institute　(20)　141-151　2019/03
Publisher: 東北福祉大学感性福祉研究所
ISSN： 1344-9966
U-Pb ages of tuffs intercalated in the uppermost Matsushima Formation and lowermost Otsuka Formation, eastern Miyagi Prefecture, Japan : Implications for the Burdigalian/Langhian boundary age Peer-reviewed

高嶋礼詩, 庭野道夫, 佐藤寿正, 成田朱里, 鈴木結依, 西弘嗣

感性福祉研究所年報 = Report of Kansei Fukushi Research Institute　(20)　103-111　2019/03
Publisher: 東北福祉大学感性福祉研究所
ISSN： 1344-9966
The Kellwasser events in the Upper Devonian Frasnian to Famennian transition in the Toc Tat Formation, northern Vietnam Peer-reviewed

Komatsu, T., Urakawa, R., Inada, T., Yamauchi, K., Maekawa, T., Takashima, R., Williams, M., Nguyen, P.D., Doan, H.D., Nguyen, M.T., Niko, S., Tanaka, G., Yamaguchi, T.

Island Arc　28　(1)　2019

DOI： 10.1111/iar.12281 　

ISSN： 1038-4871
Effect of Euxinic Conditions on Planktic Foraminifers: Culture Experiments and Implications for Past and Future Environments Peer-reviewed

Azumi Kuroyanagi, Takashi Toyofuku, Yukiko Nagai, Katsunori Kimoto, Hiroshi Nishi, Reishi Takashima, Hodaka Kawahata

Paleoceanography and Paleoclimatology　34　(1)　54-62　2019/01

DOI： 10.1029/2018PA003539 　

ISSN： 2572-4517

eISSN： 2572-4525
Constraining the depositional age of an Upper Cretaceous non-marine and shallow marine siliciclastic succession, Kuji Group, northeastern Japan, based on carbon isotope stratigraphy and U−Pb radiometric dating Peer-reviewed

Arimoto, J., Takashima, R., Nishi, H., Yamanaka, T., Orihashi, Y., Jo, S., Yamamoto, K., Umetsu, K.

Cretaceous Research　92　264-278　2018/12

DOI： 10.1016/j.cretres.2018.08.007 　

ISSN： 0195-6671
Progress Reports of the Program for Archives and Publication of 3-D Point-cloud Data of the Great East Japan Earthquake for Tsunami Disaster Ruins Peer-reviewed

Harumasa KANO, Hiroshi NISHI, Atsushi FUJISAWA, Reishi TAKASHIMA, Jun NEMOTO

Bulletin of the Tohoku University Museum　(17)　139-183　2018/03
Stratigraphy of the Neogene-Quaternary sequence exposed at the Yokomuki-yama and Honoki-yama Campus, Tohoku Fukushi University Peer-reviewed

高嶋礼詩, 桑原里, 草川遥, 庭野道夫

感性福祉研究所年報 = Report of Kansei Fukushi Research Institute　(19)　79-92　2018/03
Publisher: 東北福祉大学感性福祉研究所
ISSN： 1344-9966
Mid-Cretaceous climatic warmings and environmental changes recorded in the lower and middle part of the Yezo Group, Hokkaido, northern Japan Peer-reviewed

Takashima Reishi, Sano Shin-ichi, Hayashi Keiichi

The Journal of the Geological Society of Japan　124　(6)　381-398　2018
Publisher: 一般社団法人日本地質学会
ISSN： 0016-7630

More details Close

白亜紀中頃は地球史において温暖化が最も進行した時代の一つと考えられており，温室期の環境変動を理解する上で重要な時代である．蝦夷層群は，白亜紀中頃のアプチアンから古第三紀暁新世にかけてアジア大陸東縁の前弧海盆で堆積した地層で，白亜紀の北西太平洋域の古環境変動を連続的に記録している．本巡検では，蝦夷層群に記録された2つの温暖化イベント時の地層である，セノマニアン／チューロニアン境界の海洋無酸素事変2層準の地層と，後期アプチアンの礁性石灰岩を見学する．
Distribution of Recent benthic foraminifera off western Costa Rica in the eastern equatorial Pacific Ocean Peer-reviewed

Hitomi Uchimura, Hiroshi Nishi, Reishi Takashima, Azumi Kuroyanagi, Yuzuru Yamamoto, Steffen Kutterolf

PALEONTOLOGICAL RESEARCH　21　(4)　380-396　2017/10

DOI： 10.2517/2017PR003 　

ISSN： 1342-8144
Utility of trace elements in apatite for discrimination and correlation of Quaternary ignimbrites and co-ignimbrite ashes, Japan Peer-reviewed

Reishi Takashima, Sato Kuwabara, Takafumi Sato, Keiji Takemura, Hiroshi Nishi

QUATERNARY GEOCHRONOLOGY　41　151-162　2017/08

DOI： 10.1016/j.quageo.2017.04.001 　

ISSN： 1871-1014

eISSN： 1878-0350
宮城県沿岸海域の堆積調査

山田努, 西弘嗣, 高嶋礼詩, 平野信一

平成28年度東北マリンサイエンス拠点形成事業（海洋生態系の調査研究）課題I「漁場環境の変化プロセスの解明」成果概要　106-109　2017/07

More details Close

編集兼発行者：国立大学法人東北大学大学院農学研究科東北大学マリンサイエンス復興支援室 印刷：有限会社明倫社 全103ページ
Vertical thermal gradient history in the eastern equatorial Pacific during the early to middle Miocene: Implications for the equatorial thermocline development Peer-reviewed

Hiroki Matsui, Hiroshi Nishi, Azumi Kuroyanagi, Hiroki Hayashi, Minoru Ikehara, Reishi Takashima

PALEOCEANOGRAPHY　32　(7)　729-743　2017/07

DOI： 10.1002/2016PA003058 　

ISSN： 0883-8305

eISSN： 1944-9186
Stratigraphic and petrologic insights into the Late Jurassic-Early Cretaceous tectonic framework of the Northwest Pacific Margin Peer-reviewed

Reishi Takashima, Hiroshi Nishi, Takeyoshi Yoshida

In Itoh, Y., Takano, O., Takashima, R., Nishi, H., Yoshida, T., eds., Dynamics of Arc Migration and Amalgamation-Architectural Examples from the NW Pacific Margin　2017/04

DOI： 10.5772/64579 　
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
Marine primary producer community during the mid-Cretaceous oceanic anoxic events (OAEs) 1a, 1b and 1d in the Vocontian Basin (SE France) evaluated from triaromatic steroids in sediments Peer-reviewed

Takuto Ando, Ken Sawada, Kazuki Okano, Reishi Takashima, Hiroshi Nishi

ORGANIC GEOCHEMISTRY　106　13-24　2017/04

DOI： 10.1016/j.orggeochem.2017.02.002 　

ISSN： 0146-6380
Cretaceous warming and environmental changes linked to volcanism Peer-reviewed

高嶋礼詩, 西弘嗣

化石　(101)　69-74　2017/03
Publisher: 日本古生物学会
ISSN： 0022-9202
Benthic foraminifers and depositional environments of the Lower Cretaceous Miyako Group on Hideshima Island, Miyako area, Iwate Prefecture, northeast Japan Peer-reviewed

Urakawa Ryota, Komatsu Toshifumi, Takashima Reishi, Omatsu Keita, Nishi Hiroshi

The Journal of the Geological Society of Japan　123　(3)　121-130　2017
Publisher: 一般社団法人日本地質学会
DOI： 10.5575/geosoc.2016.0060 　

ISSN： 0016-7630

More details Close

On Hideshima Island (Miyako area, Iwate Prefecture, northeast Japan), the Albian Hideshima Formation of the Lower Cretaceous (Aptian to Albian) Miyako Group consists mainly of alternations of turbidite sandstone and mudstone, thick sandstone, and conglomerate. It is also characterized by slump beds and debris flow deposits containing poorly preserved shallow-marine bivalves such as Glycymeris, Eriphyla, Nipponitrigonia, and rudists, representing typical allochthonous occurrences. Eleven genera of the benthic foraminifera have recently been identified in the mudstone of the middle part of the Hideshima Formation. The benthic foraminiferal assemblage is dominated by Bathysiphon spp., Recurvoides spp., and Haplophragmoides spp. Facies analysis and the composition of the benthic foraminifera indicate that the Hideshima Formation accumulated in a slope environment.
Upper Devonian carbonates encapsulating the Frasnian-Fammenian boundary in northern Vietnam Peer-reviewed

Komatsu Toshifumi, Doan Hung D, Urakawa Ryota, Yamauchi Kazuki, Inada Toshitaka, Maekawa Takumi, Takashima Reishi, Williams Mark, Stocker Christopher, Nguyen Phong D

Journal of the Sedimentological Society of Japan　76　(1)　2-2　2017
Publisher: 日本堆積学会
DOI： 10.4096/jssj.76.2 　

ISSN： 1342-310X
Depositional environments and maturity evaluated by biomarker analyses of sediments deposited across the Cenomanian-Turonian boundary in the Yezo Group, Tomamae area, Hokkaido, Japan Peer-reviewed

Takuto Ando, Ken Sawada, Hideto Nakamura, Keita Omatsu, Reishi Takashima, Hiroshi Nishi

ISLAND ARC　26　(1)　2017/01

DOI： 10.1111/iar.12178 　

ISSN： 1038-4871

eISSN： 1440-1738
Fission track analysis and trace element compositions of apatite for thermo- and tephrochronology of a cretaceous event sedimentary sequence on the east asian convergent margin Peer-reviewed

Itoh, Y., Green, P.F., Takashima, R., Takemura, K.

Horizons in Earth Science Research　17　197-224　2017/01
Carbon isotopic excursions and detailed ammonoid and conodont biostratigraphies around Smithian-Spathian boundary in the Bac Thuy Formation, Vietnam Peer-reviewed

Toshifumi Komatsu, Reishi Takashima, Yasunari Shigeta, Takumi Maekawa, Huyen Dang Tran, Tien Dinh Cong, Susumu Sakata, Hung Doan Dinh, Osamu Takahashi

PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY　454　65-74　2016/07

DOI： 10.1016/j.palaeo.2016.04.017 　

ISSN： 0031-0182

eISSN： 1872-616X
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
Paleomagnetism of the Sorachi and Yezo Group in the Ashibetsu area, central Hokkaido, Japan Peer-reviewed

Yuki Kitagawa, Reishi Takashima, Yasuto Itoh

Bulletin of the Tohoku University Museum　(15)　109-125　2016/03
宮城県沿岸海域の堆積物の放射能調査

山田努, 箕浦幸治, 西弘嗣, 平野信一, 高嶋礼詩, 佐藤慎一

東北マリンサイエンス拠点形成事業（海洋生態系の調査研究）における課題「漁場環境の変化プロセスの解明」の成果報告書　5-10　2016/03

More details Close

編集兼発行者：国立大学法人東北大学大学院農学研究科東北大学マリンサイエンス復興支援室 印刷：有限会社明倫社 全169ページ
Pacific Os-187/Os-188 isotope chemistry and U-Pb geochronology: Synchroneity of global Os isotope change across OAE 2 Peer-reviewed

A. D. C. Du Vivier, D. Selby, D. J. Condon, R. Takashima, H. Nishi

EARTH AND PLANETARY SCIENCE LETTERS　428　204-216　2015/10

DOI： 10.1016/j.epsl.2015.07.020 　

ISSN： 0012-821X

eISSN： 1385-013X
Early to Middle Pleistocene paleoceanographic history of southern Japan based on radiolarian data from IODP Exp. 314/315 Sites C0001 and C0002 Peer-reviewed

Kenji M. Matsuzaki, Noritoshi Suzuki, Hiroshi Nishi, Hiroki Hayashi, Babu R. Gyawali, Reishi Takashima, Minoru Ikehara

MARINE MICROPALEONTOLOGY　118　17-33　2015/06

DOI： 10.1016/j.marmicro.2015.05.001 　

ISSN： 0377-8398

eISSN： 1872-6186
Palaeoenvironment of a monospecific association of a new bryozoan species, Schizoretepora tamagawensis sp n. (Phidoloporidae, Bryozoa), from the Miocene Tanosawa Formation, Northern Japan Peer-reviewed

Kamil Zagorsek, Reishi Takashima, Masato Hirose

NEUES JAHRBUCH FUR GEOLOGIE UND PALAONTOLOGIE-ABHANDLUNGEN　275　(1)　115-123　2015/01

DOI： 10.1127/njgpa/2015/0456 　

ISSN： 0077-7749
Middle to Late Pleistocene radiolarian biostratigraphy in the water-mixed region of the Kuroshio and Oyashio currents, northeastern margin of Japan (JAMSTEC Hole 902-C9001C) Peer-reviewed

Kenji M. Matsuzaki, Noritoshi Suzuki, Hiroshi Nishi, Reishi Takashima, Yumiko Kawate, Toyosaburo Sakaii

JOURNAL OF MICROPALAEONTOLOGY　33　205-222　2014/09

DOI： 10.1144/jmpaleo2013-012 　

ISSN： 0262-821X
Devonian-Carboniferous transition containing a Hangenberg Black Shale equivalent in the Pho Han Formation on Cat Ba Island, northeastern Vietnam Peer-reviewed

Toshifumi Komatsu, Satoru Kato, Kento Hirata, Reishi Takashima, Yukari Ogata, Masahiro Oba, Hajime Naruse, Phuong H. Ta, Phong D. Nguyen, Huyen T. Dang, Truong N. Doan, Hung H. Nguyen, Susumu Sakata, Kunio Kaiho, Peter Koenigshof

PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY　404　30-43　2014/06

DOI： 10.1016/j.palaeo.2014.03.021 　

ISSN： 0031-0182

eISSN： 1872-616X
A mid-Cretaceous (Albian-Cenomanian) shell-rubble bryozoan fauna from the Goshoura Group, Kyushu, Japan Peer-reviewed

Matthew H. Dick, Toshifumi Komatsu, Reishi Takashima, Andrew N. Ostrovsky

JOURNAL OF SYSTEMATIC PALAEONTOLOGY　12　(4)　401-425　2014/05

DOI： 10.1080/14772019.2013.765926 　

ISSN： 1477-2019

eISSN： 1478-0941
Radiolarian biostratigraphic scheme and stable oxygen isotope stratigraphy in southern Japan (IODP Expedition 315 Site C0001) Peer-reviewed

Kenji M. Matsuzaki, Hiroshi Nishi, Hiroki Hayashi, Noritoshi Suzuki, Babu R. Gyawali, Minoru Ikehara, Takuyuki Tanaka, Reishi Takashima

NEWSLETTERS ON STRATIGRAPHY　47　(1)　107-130　2014/04

DOI： 10.1127/0078-0421/2014/0044 　

ISSN： 0078-0421
Lower Triassic mixed carbonate and siliciclastic setting with Smithian-Spathian anoxic to dysoxic facies, An Chau basin, northeastern Vietnam Peer-reviewed

Toshifumi Komatsu, Hajime Naruse, Yasunari Shigeta, Reishi Takashima, Takumi Maekawa, Huyen T. Dang, Tien C. Dinh, Phong D. Nguyen, Hung H. Nguyen, Gengo Tanaka, Masatoshi Sone

SEDIMENTARY GEOLOGY　300　28-48　2014/03

DOI： 10.1016/j.sedgeo.2013.10.009 　

ISSN： 0037-0738

eISSN： 1879-0968
Paleoceanographic history of the Northwest Pacific Ocean over the past 740 kyr, discerned from radiolarian fauna Peer-reviewed

Kenji M. Matsuzaki, Hiroshi Nishi, Noritoshi Suzuki, Giuseppe Cortese, Frederique Eynaud, Reishi Takashima, Yumiko Kawate, Toyosaburo Sakai

PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY　396　26-40　2014/02

DOI： 10.1016/j.palaeo.2013.12.036 　

ISSN： 0031-0182

eISSN： 1872-616X
Cycladophora davisiana abundances as a paleoceanographic and stratigraphic tool in high latitude siliciceous sediments Peer-reviewed

Kenji M. Matsuzaki, Hiroshi Nishi, Noritoshi Suzuki, Yumiko Kawate, Reishi Takashima, Toyosaburo Sakai

MARINE MICROPALEONTOLOGY　106　1-9　2014/01

DOI： 10.1016/j.marmicro.2013.11.002 　

ISSN： 0377-8398

eISSN： 1872-6186
Marine and nonmarine deposits of the Cretaceous Miyako and Kuji groups and Late Cretaceous terrestrial vertebrates in Iwate Prefecture, northeast Japan Peer-reviewed

Umetsu Keita, Hirayama Ren, Sonoda Teppei, Takashima Reishi

The Journal of the Geological Society of Japan　119　(0)　S82-S95　2013
Publisher: 一般社団法人日本地質学会
DOI： 10.5575/geosoc.2013.0027 　

ISSN： 0016-7630

More details Close

東北地方の太平洋沿岸には，続成作用の影響が少なく，保存状態のよい化石や堆積構造を観察できる非海成～浅海成の白亜系が点在している．下部白亜系の宮古層群は，浅海成の波浪堆積物が主体で海生動物化石を多産し，上部白亜系の久慈層群は琥珀やカキ類の密集層，および様々な脊椎動物化石を産出することで注目されている．この巡検では，宮古層群最下部の非海成層を形成する湾奧デルタの堆積物から宮古層群中部～上部の海生動物化石密集層や津波堆積物を含む浅海層の層序，さらに非海成～浅海成層からなる久慈層群の層序および堆積構造などを観察する．また，久慈層群玉川層の最上部から報告された恐竜などを含む陸生脊椎動物化石群の発掘現場や久慈琥珀博物館も訪問する．
中期白亜紀海洋無酸素事変(OAE)層準における堆積岩のケロジェン分析:陸源有機物輸送の評価

安藤卓人, 沢田健, 岡野和貴, 小刀禰宅朗, 横山龍, 西弘嗣, 高嶋礼詩

堆積学研究　71　(3)　240　2012/12/28

ISSN： 1342-310X
Devonian-Carboniferous transition in the Pho Han Formation on Cat Ba Island, northeastern Vietnam Peer-reviewed

Komatsu, T, Takashima, R, Naruse, H, Phuong, T. H, Huyyen, D. T, Phong, N. D, Tien, D. C, Chung, H. T, Van, T. T, Kato, S, Mawkawa, T, Gatovsky, Y

Journal of the Geological Society of Japan　118　(6)　V-VI　2012/06
Early Paleogene dinocyst stratigraphy and paleoenvironment in the Northwest Pacific region. Peer-reviewed

Hayashi, K, Nishi, H, Takashima, R

Achievement of G-COE program for Earth and Planetary Dynamics and the Future Perspective　88-89　2012
A mid-Cretaceous (Albian–Cenomanian) shell-rubble bryozoan fauna from the Goshoura Group, Kyushu, Japan Peer-reviewed

Dick, M. H, Komatsu, T, Takashima, R, Ostrovsky, A. N

Journal of Systematic Palaeontology　2012
Stratigraphy and detailed age of the Upper Cretaceous Himenoura Group in the eastern part of Amakusa-Kamishima Island, Kumamoto, Japan Peer-reviewed

Kojo, Y, Komatsu, T, Iwamoto, T, Takashima, R, Takahashi, O, Nishi, H

Journal of the Geological Society of Japan　117　(7)　398-416　2011/07
Publisher: The Geological Society of Japan
DOI： 10.5575/geosoc.117.398 　

ISSN： 0016-7630

More details Close

The Upper Cretaceous Himenoura Group is exposed in the eastern part of the Amakusa-Kamishima Island, Kumamoto, Japan, where it is divided into the Hinoshima and Amura Formations, in ascending order. Inoceramids, ammonoids, and microfossils (e.g., radiolarians and foraminifers) are abundant in this area. The Hinoshima Formation yields Dicarinella canaliculata and abundant Marginotruncana pseudolinneiana (foraminifers), Inoceramus amakusensis (inoceramid), and Texanites kawasakii (ammonoid), indicating a Santonian age. The Amura Formation yields a Campanian foraminifera assemblage composed mainly of Grobotruncana linneiana and G. cf. arca; these species are also abundant in the upper part of the Amura Formation. Therefore, the Santonian—Campanian boundary is probably situated in the lower part of the Amura Formation. In the Hinoshima and Amura Formations, the radiolarian assemblage is characterized by Amphipyndax stocki, Dictyomitra formosa, and D. koslovae, indicating the Santonian to Middle Campanian.
New U-Pb (ID-TIMS and LA-ICPMS) and Ar-40/Ar-39 geochronological constraints of the Cretaceous geologic time scale calibration from Hokkaido (Japan) Peer-reviewed

X. Quidelleur, J. L. Paquette, N. Fiet, R. Takashima, M. Tiepolo, D. Desmares, H. Nishi, D. Grosheny

CHEMICAL GEOLOGY　286　(3-4)　72-83　2011/07

DOI： 10.1016/j.chemgeo.2011.03.009 　

ISSN： 0009-2541
Prevailing oxic environments in the Pacific Ocean during the mid-Cretaceous Oceanic Anoxic Event 2 Peer-reviewed

Reishi Takashima, Hiroshi Nishi, Toshiro Yamanaka, Takashige Tomosugi, Allan G. Fernando, Kazushige Tanabe, Kazuyoshi Moriya, Fumihisa Kawabe, Keiichi Hayashi

NATURE COMMUNICATIONS　2　(234)　2011/03

DOI： 10.1038/ncomms1233 　

ISSN： 2041-1723
Geology and foraminiferal biostratigraphy of Upper Cretaceous sequences in southern central Hokkaido, Japan Peer-reviewed

Hayashi, K, Nishi, H, Takashima, R, Tomosugi, T, Kawabe, F

Journal of the Geological Society of Japan　117　(1)　14-34　2011/01
Publisher: The Geological Society of Japan
DOI： 10.5575/geosoc.117.14 　

ISSN： 0016-7630

More details Close

The upper part of the Yezo Group, which is widely exposed in southern central Hokkaido, consists of the Saku, Kashima, and Hakobuchi formations, in ascending order. Although the Yezo Group has been well studied in central and northwestern Hokkaido, little is known about the stratigraphy of the group in southern central Hokkaido. To clarify the geological age and microfossil faunal assemblage of the Yezo Group in this region, we studied the geology, litho-biostratigraphy, and microfossil-biostratigraphy of the group in the southern Oyubari and Tomiuchi-Azumi areas. Based on the stratigraphic distribution of benthonic and planktonic foraminifera in the Saku and Kashima formations in the studied areas, we establish four new benthonic foraminiferal zones, as follows (in ascending order): the Haplophragmoides obesus Assemblage Zone (upper Turonian), the Silicosigmoilina futabaensis Interval Zone (upper Turonian? to upper Coniacian), the Nuttallinella florealis-Notoplanulina japonica Concurrent Zone (upper Coniacian to Santonian), and the Lenticulina spp. Interval Zone (lower Campanian). The benthonic foraminiferal assemblage indicates the sequence was deposited at middle to upper bathyal depths from the late Turonian to early Campanian.
地球深部探査船「ちきゅう」の下北半島沖慣熟航海コア試料―物性変動から予測される古環境変動― Peer-reviewed

青池寛, 西弘嗣, 坂本竜彦, 飯島耕一, 土屋正史, 平朝彦, 倉本真一, 相田吉昭, 秋元和實, 堂満華子, 林広樹, 長谷川四郎, 北里洋, 池原実, 岩井雅夫, 丸山俊明, 尾田太良, 岡田尚武, 大井剛志, 大金薫, 佐藤時幸, 酒井豊三郎, 鈴木紀毅, 谷村好洋, 高嶋礼詩, 内田淳一, 山崎誠

Fossil　87　65-81　2010/03
Publisher: Palaeontological Society of Japan
DOI： 10.14825/kaseki.87.0_65 　

ISSN： 0022-9202

More details Close

D/V CHIKYU shakedown cruises of CK05-04 Leg 2 (16 Nov.-14 Dec. 2005) and CK06-06 (6 Aug.-29 Oct. 2007) were carried out off Shimokita Peninsula of the Northeast Japan. During these two cruises, three continuous cores of 47m, 71m and 365m long were recovered from the seafloor of about 1200m water depth at Holes C9001A, C9002A/B and C9001C, respectively. Cuttings samples were collected from Hole C9001D from 522 to 647mbsf in penetration depth using riser drilling. The onboard laboratory systems integration test including primary processing and measurements of the recovered cores were performed for laboratory performance evaluation and laboratory staff training. Two coring sites (C9001 and C9002) are located in Hidaka Trough that is a forearc basin under tectonic effects of both subduction and arc-arc collision. Cored sediments at four holes (C9001A, C9002A/B, C9001C) are mainly composed of diatomaceous silty clay, and divided into four lithologic units based on the lithology at Hole C9001C. Unit A is characterized by common intercalations of tephra/sand, while Unit B is rarely found in tephra/sand intercalations. Unit C is composed of a unconsolidated sands, and the Unit D is similar to the Unit A that is common intercalations of tephra/sand layers. The integrated stratigraphy based on micropaleontology, tephrochronology and magnetostratigraphy suggests that a bottom age of Hole C9001C at 365mbsf is assigned to about 780ka, and the geological age of Hole C9001D ranges from 1.05 to 1.65Ma. The sedimentation rate is high and nearly constant of 62cm/kyr at Hole C9001C and is low of about 17cm/kyr at Hole C9001D. The core of Hole C9001C has a continuous sequence without hiatus although the disturbance interval is recognized around 130mbsf. Based on the age model, the volcanic activity around the Northwest Pacific is thought to decrease during approximately 250-640ka of Unit B of C9001C using magnetic susceptibility data and the stratigraphy of tuff layers. The physical measurements of various methods revealed that two different lithology of Clays A and B are recognized in the sediments. The Clay A contains abundant diatoms during high productivity period, while Clay B is affected by inflow of high terrigenous clastics or low diatom productivity. These clays suggest a cyclic sedimentation controlled by the Milankovitch cycles.
High-resolution terrestrial carbon isotope and planktic foraminiferal records of the Upper Cenomanian to the Lower Campanian in the Northwest Pacific Peer-reviewed

Reishi Takashima, Hiroshi Nishi, Toshiro Yamanaka, Keiichi Hayashi, Amane Waseda, Akiko Obuse, Takashige Tomosugi, Naoki Deguchi, Sunao Mochizuki

EARTH AND PLANETARY SCIENCE LETTERS　289　(3-4)　570-582　2010/01

DOI： 10.1016/j.epsl.2009.11.058 　

ISSN： 0012-821X
Calcareous nannofossil biostratigraphy of the Thomel Level (OAE2) in the Lambruisse section, Vocontian Basin, southeast France Peer-reviewed

Allan Gil S. Fernando, Reishi Takashima, Hiroshi Nishi, Fabienne Giraud, Hisatake Okada

GEOBIOS　43　(1)　45-57　2010/01

DOI： 10.1016/j.geobios.2009.11.003 　

ISSN： 0016-6995

eISSN： 1777-5728
Age model of core sediments taken by D/V CHIKYU during the shakedown cruises off Shimokita Peninsula Peer-reviewed

Domitsu Hanako, NISHI Hiroshi, UCHIDA Junichi, ODA Motoyoshi, OGANE Kaoru, TAIRA Asahiko, AOIKE Kan, Nishi Hiroshi, Uchida Junichi, Oda Motoyoshi, Ogane Kaoru, Taira Asahiko, Aoike Kan, Shimokita Microfossil, Research Group, Shimokita Microfossil Research Group

Fossils　87　(0)　47-64　2010
Publisher: 日本古生物学会
DOI： 10.14825/kaseki.87.0_47 　

ISSN： 0022-9202

More details Close

Three continuous cores of 47m, 71m and 365m in thickness were recovered from the subseafloor at about 1200m water depth at Holes C9001A, C9002A/B and C9001C/D during D/V CHIKYU shakedown cruises of CK05-04 Leg 2 (16 November-14 December 2005) and CK06-06 (6 August-29 October 2007). The core sediments are composed mainly of diatomaceous silty clay, and are divided into four lithologic units from Units A to D at Hole C9001C. The Unit A is characterized by common intercalations of tephra/sand and higher magnetic susceptibility (MS), while the Unit B is rare in tephra/sand intercalations with lower MS. The Unit C is composed of unconsolidated sands, and the Unit D is similar in lithology with the Unit A. The integrated stratigraphy of micropaleontology, tephrochronology and magnetostratigraphy suggest that the bottom age of Hole C9001C core is correlated with the base of the Brunhes Chron (Chron C1n) that is assigned to about 780ka (Middle Pleistocene). The geological age of Hole C9001D ranges from 1.05 to 1.65Ma (Early Pleistocene). The oxygen isotope stages from Marine Isotope Stage (MIS) 1 to MIS 18 are recognized in Hole C9001C based on the correlation with a standard isotope curve, and these data accord well with the results of biostratigraphy and magnetostratigraphy. The Unit A ranges from MIS 1 to MIS 8 (about 300ka), and Unit B spans from MIS 9 to MIS 16 (300ka-640ka). The Units C and D are assigned to MIS 17 and MIS 18, respectively. Hole C9001C core has a continuous sequence without hiatus although a disturbance layer occurs around 150mbsf. Thus, the Shimokita cores have a strong potential to improve biochronology and revise geological time scales for the past 800kyr in the Northwest Pacific region.
蝦夷層群における統合層序‐日本と欧州の上部白亜系の高解像度年代対比‐

西弘嗣, 高嶋礼詩, 山中寿郎, 林圭一, 早稲田周, 小布施明子

石油技術協会誌　74　(4)　363　2009/07

ISSN： 0370-9868
Litho-, bio- and chemostratigraphy across the Cenomanian/Turonian boundary (OAE 2) in the Vocontian Basin of southeastern France Peer-reviewed

Reishi Takashima, Hiroshi Nishi, Keiichi Hayashi, Hisatake Okada, Hodaka Kawahata, Toshiro Yamanaka, Allan G. Fernando, Mami Mampuku

PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY　273　(1-2)　61-74　2009/03

DOI： 10.1016/j.palaeo.2008.12.001 　

ISSN： 0031-0182
Further examples of archaeal-derived hydrocarbons in mid-Cretaceous oceanic anoxic event (OAE) 1b sediments Peer-reviewed

Kazuki Okano, Ken Sawada, Reishi Takashima, Hiroshi Nishi, Hisatake Okada

ORGANIC GEOCHEMISTRY　39　(8)　1088-1091　2008/08

DOI： 10.1016/j.orggeochem.2008.04.022 　

ISSN： 0146-6380
Geology and sedimentary environments of the Pleistocene Setana Formation in the Kuromatsunai District, Southwestern Hokkaido, Japan Peer-reviewed

Takashima, R, Dick, M. H, Nishi, H, Mawatari, S. F, Nojo, A, Hirose, M, Gautam, P, Nakamura, K, Tanaka, T

The Origin and Evolution of Natural Diversity　75-82　2008/03
Rockmagnetic characterization of the Setana and Chiraigawa Formations in SW Hokkaido (Soebetsu River, Kuromatsunai) Peer-reviewed

Gautam, P, Takashima, R, Dick, M.H, Kanamatsu, T, Rijal, M.L, Nishi H, Mawatari, S.F

The Origin and Evolution of Natural Diversity　101-107　2008/03
Experimental study of the use of the stable isotopic composition of calcareous microfossils in shallow marine sediments for reconstructing paleoenvironment, and a comparison with the MART index Peer-reviewed

Ishimura T, Dick, M.H, Takashima, R, Hirose, M, Gautam, P, Nishi, H, Tsunogai, U

The Origin and Evolution of Natural Diversity　157th (Web)　109-114　2008/03
Habitats of Bivalves in the Lower-Cretaceous Aptian Tanohata and Aptian to Albian Hiraiga Formations, Iwate Prefecture, Northeastern Japan Peer-reviewed

Komatsu, T, Yoshihara, K, Dick M. H, Takashima, R, Ostrovsky, A, Nishi, H

The Origin and Evolution of Natural Diversity　163-170　2008/03
Application of MART Analysis to Infer Paleoseasonality in a Pleistocene Shallow Marine Benthic Environment Peer-reviewed

Dick, M. H, Hirose, M, Takashima, R, Ishimura, T, Nishi, H, Mawatari, S. F

The Origin and Evolution of Natural Diversity　83-91　2008/03
Depositional Environments Revealed From Biomarkers in Sediments Deposited During the Mid-Cretaceous Oceanic Anoxic Events (OAEs) in the Vocontian Basin (SE France) Peer-reviewed

Okano, K, Sawada, K, Takashima, R, Nishi, H, Okada, H

The Origin and Evolution of Natural Diversity　233-238　2008/03
Paleoceanography of the northwestern Pacific during the Albian Peer-reviewed

Mitsuru Yamamura, Hodaka Kawahata, Katsumi Matsumoto, Reishi Takashima, Hiroshi Nishi

PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY　254　(3-4)　477-491　2007/10

DOI： 10.1016/j.palaeo.2007.07.002 　

ISSN： 0031-0182
The first Pacific record of the Late Aptian warming event Peer-reviewed

Reishi Takashima, Shin-Ichi Sano, Yasuhiro Iba, Hiroshi Nishi

JOURNAL OF THE GEOLOGICAL SOCIETY　164　333-339　2007/03

DOI： 10.1144/0016-76492006-006 　

ISSN： 0016-7649
Mid-Cretaceous Oceanic Anoxic Events recorded in SE France and central Italy Peer-reviewed

Takashima, R, Coccioni, R, Nishi, H, Hayashi, K

Journal of the Geological Society of Japan　113　(2)　iii-iv　2007
Publisher: The Geological Society of Japan
DOI： 10.5575/geosoc.113.2.III_IV 　

ISSN： 0016-7630
Greenhouse world and the Mesozoic ocean Peer-reviewed

Reishi Takashima, Hiroshi Nishi, Brian T. Huber, R. Mark Leckie

Oceanography　19　(4)　82-92　2006/12

DOI： 10.5670/oceanog.2006.07 　

ISSN： 1042-8275
First record of a Cretaceous cheilostome bryozoan from Hokkaido, Japan Peer-reviewed

Andrew N. Ostrovsky, Reishi Takashima, Matthew H. Dick, Andrei V. Grischenko, Hiroshi Nishi, Shunsuke F. Mawatari

CRETACEOUS RESEARCH　27　(6)　859-862　2006/12

DOI： 10.1016/j.cretres.2006.04.001 　

ISSN： 0195-6671
Late Jurassic-Early cretaceous intra-arc sedimentation and volcanism linked to plate motion change in northern Japan Peer-reviewed

Reishi Takashima, Hiroshi Nishi, Rakeyoshi Yoshida

Geological Magazine　143　(6)　753-770　2006/11

DOI： 10.1017/S001675680600255X 　

ISSN： 0016-7568 1469-5081
Use of a microdrill for high stratigraphical resolution calcareous nannofossil analysis, and a modified filtration method Peer-reviewed

Fernando, A. G. S, Okada, H, Nishi, H, Takashima, R

Journal of Nannoplankton Research　28　85-87　2006
Recent Advances in Research on Terrestrial and Marine sequences from the mid-Cretaceous Oceanic Anoxic Events (OAEs) Peer-reviewed

Takashima, R, Gautam, P, Nishi, H

Scientific Drilling　2　(2)　50-51　2006
Publisher: IODP-MI (IODP Management International, Inc.)
ISSN： 1816-3459
テクトニクスと無酸素環境

髙嶋礼詩

月刊海洋　37　(12)　881-885　2005
Publisher:
ISSN： 0916-2011
ヒマラヤ山脈のテクトニクスと東アジアの古環境・古気候の変動 Peer-reviewed

西弘嗣, 高嶋礼詩

石油技術協会誌　70　(1)　6-14　2005/01
Publisher:
DOI： 10.3720/japt.70.6 　

ISSN： 0370-9868
Geology and stratigraphy of forearc basin sediments in Hokkaido, Japan: Cretaceous environmental events on the north-west Pacific margin Peer-reviewed

R Takashima, F Kawabe, H Nishi, K Moriya, R Wani, H Ando

CRETACEOUS RESEARCH　25　(3)　365-390　2004/06

DOI： 10.1016/j.cretres.2004.02.004 　

ISSN： 0195-6671

eISSN： 1095-998X
Planktonic foraminiferal zonation in the Cretaceous Yezo Group, Central Hokkaido, Japan Peer-reviewed

H Nishi, R Takashima, T Hatsugai, T Saito, K Moriya, A Ennyu, T Sakai

JOURNAL OF ASIAN EARTH SCIENCES　21　(8)　867-886　2003/06

DOI： 10.1016/S1367-9120(02)00138-4 　

ISSN： 1367-9120
Stratigraphic carbon isotope fluctuations of detrital woody materials during the Aptian Stage in Hokkaido, Japan: Comprehensive delta C-13 data from four sections of the Ashibetsu area Peer-reviewed

A Ando, T Kakegawa, R Takashima, T Saito

JOURNAL OF ASIAN EARTH SCIENCES　21　(8)　835-847　2003/06

DOI： 10.1016/S1367-9120(02)00112-8 　

ISSN： 1367-9120
Biostratigraphy of the Upper Albian to Lower Cenomanian in Oyubari, Hokkaido, Japan: implications for the Cretaceous biochronology in the North Pacific Peer-reviewed

Kawabe, F, Takashima, R, Wani, R, Moriya, K, Nishi, H

Acta Geologica Polonica　53　81-91　2003
Upper-Albian to Lower Cenomanian biostratigraphy in the Oyubari area, Hokkaido, Japan: Toward a Cretaceous biochronology for the North Pacific Peer-reviewed

Fumihisa Kawabe, Reishi Takashima, Ryoji Wani, Hiroshi Nishi, Kazuyoshi Moriya

Acta Geologica Polonica　53　(2)　81-91　2003/01
Publisher: Institute of Geology, University of Warsaw
ISSN： 0001-5709
Geology, petrology and tectonic setting of the Late Jurassic ophiolite in Hokkaido, Japan Peer-reviewed

R Takashima, H Nishi, T Yoshida

JOURNAL OF ASIAN EARTH SCIENCES　21　(2)　197-215　2002/12

DOI： 10.1016/S1367-9120(02)00028-7 　

ISSN： 1367-9120
New perspective on Aptian carbon isotope stratigraphy: Data from delta C-13 records of terrestrial organic matter Peer-reviewed

A Ando, T Kakegawa, R Takashima, T Saito

GEOLOGY　30　(3)　227-230　2002/03

DOI： 10.1130/0091-7613(2002)030<0227:NPOACI>2.0.CO;2 　

ISSN： 0091-7613
東京大学北海道演習林地域に分布する中生界空知層群および蝦夷層群の層序と地質 Peer-reviewed

高嶋礼詩, 宮本義憲, 西弘嗣, 吉田武義

東京大学演習林報告　(108)　57-76　2002
Publisher:
ISSN： 0371-6007
白亜紀の海洋無酸素事変（OAE1b）の高分解能解析

長谷川卓, 西弘嗣, 岡田尚武, 坂本竜彦, Luc Beaufort, Fabianne Giraud, Oliver Friedrich, 古川麻里子, 川幡穂高, 大河内直彦, 高嶋礼詩, 黒柳あずみ, 山村充, 勝田長貴

月刊地球　24　454-460　2002
北海道夕張－芦別地域に分布する空知，蝦夷層群の地質と堆積環境—北海道の後期中生代テクトニクス— Peer-reviewed

高嶋礼詩, 吉田武義, 西弘嗣

地質学雑誌　107　(6)　359-378　2001
Publisher: The Geological Society of Japan
DOI： 10.5575/geosoc.107.359 　

ISSN： 0016-7630

More details Close

The Upper Mesozoic Sorachi and Yezo Groups are widely distributed in the Yubari-Ashibetsu region, located in the axial zone of central Hokkaido, the northernmost island of Japan. The Sorachi Group in this area consists mainly of volcanic rocks and volcaniclastic turbiditic rocks, and is divided into the Gokurakudaira, Ashibetsugawa, Nakatengu and Shirikishimanaigawa Formations in ascending order. The Gokurakudaira Formation constitutes mostly picrites, accompanied by intercalation of dacitic-andesitic volcaniclastic rocks and arkosic terrigenous turbiditic sandstones derived from the East Asian Continent. The Ashibetsugawa Formation is composed of medium-bedded red mudstone with several andesitic volcanic sandstone beds. The other two formations are characterized by andesitic volcaniclastic rocks. The rocks of the Nakatengu Formation are thick breccia beds and very thin-bedded mudstones, while those of the Shirikishimanaigawa Formation are thick- to medium- bedded sandstones, mudstones and tuff. The Yezo Group conformably overlying the Sorachi Group comprises alternating beds of terrigenous turbiditic sandstone and hemipelagic mudstone, presumably resulted from the erosion of the uplifted Jurassic accretionary prisms (Oshima Belt) located in southwestern Hokkaido. The two stratigraphic marker units of olistostrome unit containing "Orbitolina Limestone" blocks (the Upper Aptian Kirigishiyama Olisto- strome Member) and felsic tuffaceous unit (the Upper Albian Maruyama Formation), are recognized in the Yezo Group. Based on the biostrati-graphic study using radiolarians and planktonic foraminifers, the Sorachi Group and the lower part of the Yezo Group range in age from Tithonian to early Albian. Many previous works have been considered that the Sorachi Group consisted of basaltic rocks and cherts. However, we found intercalation of thick sedimentary sequence composed of arkosic sandstones within the basaltic rocks in the investigated area. This suggest that the basaltic eruptions, in part, occurred in an adjacent area close to the Asian continent. Moreover, some volcaniclastic rocks of the Sorachi Group also contain many ooids including angular andesite fragments. The occurrence of these rocks also indicates shallow marine environment on the volcanic mound.
Planktonic foraminiferal zonation in the Cretaceous Yezo group, Hokkaido, Japan

H. Nishi, R. Takashima, T. Hatsugai, A. Ennyu, T. Sakai, T. Saito

Fossils　68　17-18　2000/01/01
Publisher: Palaeontological Society of Japan
DOI： 10.14825/kaseki.68.0_17 　

ISSN： 0022-9202
北海道に分布する蝦夷層群の浮遊性有孔虫化石帯区分 Peer-reviewed

西弘嗣, 高嶋礼詩, 初貝隆行, 圓入敦仁, 斎藤常正, 酒井利彰

化石　68　(68)　17-18　2000
Publisher: Palaeontological Society of Japan
DOI： 10.14825/kaseki.68.0_17 　

ISSN： 0022-9202
崕山の石灰岩が教えてくれること

佐野晋一, 高嶋礼詩

芦別市星の降る里百年記念館年報　6　15-22　1999
中蝦夷地変の再検討と北海道の白亜紀テクトニクス Peer-reviewed

高嶋礼詩, 西弘嗣

地質学雑誌　105　(10)　711-728　1999

DOI： 10.5575/geosoc.105.711 　
北海道中央部，富良野地域の空知層群火山岩に対する古地磁気解析

星博幸, 高嶋礼詩

三笠市立博物館紀要　(3)　23-30　1998
Reexamination of the unconformity proposed at the boundary between the lower and middle Yiezo Groups in the Soshubetsu area, Hokkaido, and its geological significance - reevaluation of the intra-Yezo disturbance

Takashima, R., Suzuki, N., Koike, T., Saito, T.

Journal - Geological Society of Japan　103　(5)　1997
北海道シューパロ川流域に分布する白亜系の地質と浮遊性有孔虫化石層序 Peer-reviewed

高嶋礼詩, 西弘嗣, 斎藤常正, 長谷川卓

地質学雑誌　103　543-563　1997

DOI： 10.5575/geosoc.103.543 　
北海道双珠別地域における下部・中部蝦夷層群境界の不整合の再検討とその地史的意義—中蝦夷地変の再検討— Peer-reviewed

高嶋礼詩, 鈴木紀毅, 小池敏夫, 斎藤常正

地質学雑誌　103　489-492　1997

DOI： 10.5575/geosoc.103.489

Show all ︎Show first 5

Misc. 153

Evaluation of fossil geomacromolecular sources by the pyrolysis of density fractions of kerogens from Cretaceous and Miocene organic-rich marine shales

Sakugawa Gen, Ikeda Masashi A., Ando Takuto, Takashima Reishi, Nishi Hiroshi, Sawada Ken, Sawada Ken

Geochemical Journal (Web)　58　(4)　2024

ISSN： 1880-5973
栗駒山南麓の新第三系-第四系の層序

水戸悠河, 高嶋礼詩, 原田拓也, 黒柳あずみ

日本地質学会学術大会(Web)　131st　2024

ISSN： 2187-6665
北海道白糠丘陵に露出する白亜紀-古第三紀境界付近の統合層序と年代

高嶋礼詩, 太田映, 黒田潤一郎, SCHMITZ Mark, 林圭一, 西弘嗣, 折橋裕二, 星博幸, 沢田健, 山中寿朗, 池田雅志, 細萱航平

日本地質学会学術大会(Web)　131st　2024

ISSN： 2187-6665
北海道白糠丘陵における白亜紀-古第三紀境界のオスミウム同位体層序

太田映, 黒田潤一郎, 高嶋礼詩, 高嶋礼詩, 星博幸, 沢田健, 林圭一, 西弘嗣, 石川晃

日本地質学会学術大会(Web)　131st　2024

ISSN： 2187-6665
ベトナムに分布する上部デボン系トックタット層とソムニャー層のケルワッサー事変

小松俊文, 川島大稀, 山田敏弘, 高嶋礼詩, 前川匠, NGUYEN Duc Phong, DOAN Dinh Hung

日本地質学会学術大会(Web)　131st　2024

ISSN： 2187-6665
和歌山県串本町,橋杭岩岩脈の珪長質火山岩と苦鉄質包有物の産状,化学組成,および年代

和田穣隆, 新正裕尚, 高嶋礼詩, 仁木創太, 折橋裕二, 佐々木実, 平田岳史

日本地質学会学術大会(Web)　131st　2024

ISSN： 2187-6665
重鉱物元素組成を用いた山形・福島県に分布する中新世-鮮新世凝灰岩の識別・対比

冨樫琴美, 高嶋礼詩, 折橋裕二, 淺原良浩, 永橋こう輝, 北見匠, 黒柳あずみ

日本地質学会学術大会(Web)　131st　2024

ISSN： 2187-6665
重鉱物元素組成による紀伊半島の中期中新世火砕流堆積物の対比

辻本大暉, 高嶋礼詩, 佐藤隆春, 黒柳あずみ

日本地質学会学術大会(Web)　131st　2024

ISSN： 2187-6665
GC-MS analysis of tricyclic and tetracyclic terpanes in Proterozoic and Paleozoic sedimentary rocks

四木りさ, 池田A.雅志, 安藤卓人, 高嶋礼詩, 小松俊文, 沢田健, 沢田健

Researches in Organic Geochemistry (Web)　40　(2)　2024

ISSN： 2189-7891
Multi-proxy dataset of mid-Cretaceous Oceanic Anoxic Event 2 for the Omagari-zawa section, Hokkaido, Japan.

Takashima, Reishi, Selby, David, Yamanaka, Toshiro, Kuwahara, Yoshihiro, Nakamura, Hideto, Sawada, Ken, Ikeda, Masashi A, Ando, Takuto, Hayashi, Keiichi, Nishida, Mari, Usami, Toshiaki, Kameyama, Daichi, Nishi, Hiroshi, Kuroyanagi, Azumi, Gyawali, Babu Ram

PANGAEA　2024

DOI： 10.1594/PANGAEA.964200 　
Conodont biostratigraphy and Kellwasser Event horizons of the Upper Devonian Toc Tat Fm. in Ha Giang Province, Vietnam.

小松俊文, 山内一輝, 前川匠, 高嶋礼詩, 小形優加里, 山田敏弘, HUNG Doan Dinh

日本古生物学会例会講演予稿集　172nd (CD-ROM)　2023
Revised age of the OAE1a based on the radiometric ages of tuffs and integrated stratigraphy of the Yezo Group, Japan: Report on the results of the joint Japan-U.S.-U.K. project on the Cretaceous time scale.

高嶋礼詩, SINGER Bradley S., SELBY David, SCHMITZ Mark D., SAGEMAN Bradley B., LI Youjuan, PODRECCA Luca, SAVATIC Katarina, 林圭一, 山中寿朗

日本地質学会学術大会(Web)　130th　2023

ISSN： 2187-6665
Paleoenvironmental reconstruction by biomarker analyses of sedimentary rocks deposited across the Cretaceous/Paleogene boundary in the Nemuro Group, Hokkaido, Japan

林和生, 池田雅志, 沢田健, 林圭一, 高嶋礼詩, 西弘嗣, 黒田潤一郎, 太田映

日本地質学会学術大会(Web)　130th　2023

ISSN： 2187-6665
Chronological re-examination of Koyamada formation: Uppermost part of the Lower Cretaceous Soma-Nakamura Group, Fukushima, Japan

都丸大河, 高嶋礼詩, 折橋裕二, 山中寿朗, 安藤寿男, 淺原良浩, 西弘嗣, 黒柳あずみ

日本地質学会学術大会(Web)　130th　2023

ISSN： 2187-6665
Geology of the Aratozawa area, Miyagi prefecture, Japan

水戸悠河, 高嶋礼詩, 折橋裕二, 黒柳あずみ, 淺原良浩

日本地質学会学術大会(Web)　130th　2023

ISSN： 2187-6665
Exploring paleobiological and geological insights through color analysis of pollen and spore fossils in sedimentary rocks of the Haborogawa Formation, Yezo Group, Hokkaido

早川万穂, 中村英人, 池田雅志, 沢田健, 高嶋礼詩, 高嶋礼詩, 西弘嗣

日本地質学会学術大会(Web)　130th　2023

ISSN： 2187-6665
Osmium isotope stratigraphy of the Cretaceous-Paleogene boundary in the Nemuro Group

太田映, 黒田潤一郎, 高嶋礼詩, 高嶋礼詩, 星博幸, 林圭一, 鈴木勝彦, 石川晃, 西弘嗣

日本地質学会学術大会(Web)　130th　2023

ISSN： 2187-6665
Osmium isotope stratigraphy of the Cretaceous-Paleogene boundary in the Nemuro Group

太田映, 黒田潤一郎, 石川晃, 鈴木勝彦, 高嶋礼詩

日本地球惑星科学連合大会予稿集(Web)　2023　2023
Carbon isotope stratigraphy and radiometric ages of the Upper Jurassic to Lower Cretaceous (Shishiori and Oshima groups) in Kesennuma-Oshima, Miyagi, Japan

OTSUBO Takumi, TAKASHIMA Reishi, KUROYANAGI Azumi, YAMANAKA Toshiro, ORIHASHI Yuji, ASAHARA Yoshihiro

日本地球惑星科学連合大会予稿集(Web)　2023　2023
The Weissert Event record and radiometric ages of Soma Nakamura Group

都丸大河, 高嶋礼詩, 折橋裕二, 山中寿朗, 西弘嗣, 黒柳あずみ, 淺原良浩

日本地球惑星科学連合大会予稿集(Web)　2023　2023
Biostratigraphy and assemblage of middle Cretaceous planktic foraminifera in the Vocontian Basin, southeastern France

MURAKAMI Issei, KUROYANAGI Azumi, TAKASHIMA Reishi, NISHI Hiroshi

日本地球惑星科学連合大会予稿集(Web)　2023　2023
Integrated stratigraphy across the Cretaceous/Paleocene boundary in the Shiranuka Hill, Hokkaido, Japan.

高嶋礼詩, 林圭一, 黒田潤一郎, 太田映, 星博幸, 折橋裕二, 西弘嗣, 山中寿朗, 沢田健, 林和生, 池田雅志, 細萱航平, 淺原良浩

日本地球惑星科学連合大会予稿集(Web)　2023　2023
The Paleocene to early Eocene integrated stratigraphy of dinoflagellate cyst and carbon isotope in the Nemuro Group in eastern Hokkaido, Japan

林圭一, 西弘嗣, 高嶋礼詩, 山中寿朗

日本地球惑星科学連合大会予稿集(Web)　2023　2023
Magnetostratigraphy of the Nemuro Group in the Shiranuka Hill area in eastern Hokkaido

HOSHI Hiroyuki, KITANO Yota, MITA Ichiha, TAKASHIMA Reishi, HAYASHI Keiichi

日本地球惑星科学連合大会予稿集(Web)　2023　2023
Magnetic characterization of marine sediments across a probable Cretaceous-Paleogene boundary in the Nemuro Group

HOSHI Hiroyuki, TAKAHASHI Ryoki, TAKASHIMA Reishi, HAYASHI Keiichi

日本地球惑星科学連合大会予稿集(Web)　2023　2023
Correlation of tuffs intercalated in the Pliocene Mukaiyama Formation, Sendai area, Japan, based on apatite trace element compositions

草川遥, 草川遥, 高嶋礼詩

地質学雑誌(Web)　129　(1)　2023

ISSN： 1349-9963
Reconstruction and comparison of paleovegetation changes by biomarker analysis during the Cretaceous Oceanic Anoxic Events in the Tomamae area, Hokkaido and California, North America

池田雅志, 沢田健, 安藤卓人, 中村英人, 高嶋礼詩, 高嶋礼詩, 西弘嗣

日本地質学会学術大会(Web)　130th　2023

ISSN： 2187-6665
Effects of the Cretaceous Oceanic Anoxic Event (OAE) on the evolutionary trend of planktic foraminifera.

黒柳あずみ, 川幡穂高, 尾崎和海, 鈴木淳, 西弘嗣, 高嶋礼詩

日本古生物学会年会講演予稿集　2022 (CD-ROM)　2022
Carbon isotope stratigraphy and radiometric ages of the Upper Jurassic to Lower Cretaceous (Shishiori and Oshima groups) in Kesennuma-Oshima, Miyagi, Japan

大坪拓史, 高嶋礼詩, 黒柳あずみ, 山中寿郎

日本地質学会学術大会(Web)　129th　2022

ISSN： 2187-6665
Carbon-isotope stratigraphy and U-Pb radiometric ages of the Upper Jurassic to Lower Cretaceous Soma Nakamura Group, Fukushima, Japan

都丸大河, 高嶋礼詩, 西弘嗣, 黒柳あずみ, 山中寿朗, 折橋裕二, 淺原良浩

日本地質学会学術大会(Web)　129th　2022

ISSN： 2187-6665
Application of apatite trace element compositions of tuffs for the studies of stratigraphy and culture geology

高嶋礼詩

日本地質学会学術大会(Web)　129th　2022

ISSN： 2187-6665
Planktonic foraminiferal biostratigraphy and assemblages of middle Cretaceous exposed in the Vocontian Basin, southeastern France

村上一成, 黒柳あずみ, 高嶋礼詩, 西弘嗣

日本地質学会学術大会(Web)　129th　2022

ISSN： 2187-6665
Lower Cretaceous (Aptian) planktic foraminiferal stratigraphy and assemblage of the Vocontian Basin sequence, southeastern France

高澤拓夢, 黒柳あずみ, 高嶋礼詩, 西弘嗣, SAGEMAN Bradley B

日本地質学会学術大会(Web)　129th　2022

ISSN： 2187-6665
The current state of the Mesozoic GSSPs and contributions of the Japanese Mesozoic to the Geologic Time Scale

高嶋礼詩

日本地球惑星科学連合大会予稿集(Web)　2022　2022
Reconstruction of Late Cretaceous paleovegetation based on terrestrial palynomorphs and biomarker analysis of the forearc basin sediments from the Haborogawa Formation, Yezo Group, Hokkaido, Japan

早川万穂, 池田雅志, 沢田健, 高嶋礼詩, 高嶋礼詩, 西弘嗣, 中村英人

日本地球惑星科学連合大会予稿集(Web)　2022　2022
Reconstruction of fungal flora changes by fungal palynomorph analysis in the sediments deposited during the Cretaceous Oceanic Anoxic Events

池田雅志, 沢田健, 安藤卓人, 高嶋礼詩, 西弘嗣

日本地質学会学術大会(Web)　129th　2022

ISSN： 2187-6665
Contributions of stratigraphic studies of the Yezo Group to the Cretaceous Geologic Time Scale and elucidation of Cretaceous paleoenvironmental change.

高嶋礼詩, 西弘嗣, 折橋裕二, 山中寿朗

日本地球化学会年会要旨集(Web)　68th　2021
Reconstruction of paleovegetation changes by pollen, palynomorph, and kerogen analyses of the Late Cretaceous sediments from the Kotanbetsu area, Hokkaido, Japan

早川万穂, 沢田健, 池田雅志, 高嶋礼詩, 西弘嗣

日本地球惑星科学連合大会予稿集(Web)　2021　2021
Paleovegetation changes reconstructed by terrestrial plant biomarker analyses in the sediments deposited across the Cenomanian/Turonian boundary in the Great Valley Sequence, northern California, USA

池田雅志, 沢田健, 高嶋礼詩, 西弘嗣

日本地球惑星科学連合大会予稿集(Web)　2021　2021
化成反応メカニズム解明に向けた数値シミュレーション援用フローセルシステムの開発

福士英一, 加藤佐和子, 後藤未来, 伊藤祐介, 天谷賢治, 大西有希, 石井翼, 塔ヶ崎礼詩, KWON Junam

日本パーカライジング技報　(32)　2020

ISSN： 1340-2706
上部白亜系久慈層群における炭素同位体比・U‐Pb放射年代統合層序を用いた地質年代決定

有元純, 高嶋礼詩, 西弘嗣, 山中寿朗, 折橋裕二, 條将太, 山本鋼志, 梅津慶太

日本古生物学会例会講演予稿集　168th　31　2019/01/25
ベトナム北部ハーザン省シーファイ峠に分布する上部デボン系のコノドント生層序とテンタキュリトイドの衰退

稲田稔貴, 小松俊文, 浦川良太, 前川匠, 高嶋礼詩, NGUYEN Phong D., DOAN Hung D.

日本古生物学会年会講演予稿集　2019　2019
中期始新世における北西大西洋表層の熱的成層構造:IODP Site U1408コア試料に含まれる浮遊性有孔虫化石の安定同位体比分析による推定

有元純, 西弘嗣, 黒柳あずみ, 高嶋礼詩, 松井浩紀, 池原実

日本古生物学会年会講演予稿集　2019　2019
東北日本の上部白亜系前弧海盆堆積物に記録された海水準変動とテクトニクス

有元純, 高嶋礼詩, 西弘嗣, 折橋裕二, 山中寿朗

日本地球惑星科学連合大会予稿集(Web)　2019　2019
北海道の下部白亜系・蝦夷層群下部における浮遊性有孔虫化石・炭素同位体比統合層序と凝灰岩の放射年代

岡智司, 高嶋礼詩, 西弘嗣, 折橋裕二

日本地質学会学術大会講演要旨　126th　2019

ISSN： 1348-3935
北海道苫前地域における蝦夷層群のAlbian-Campanian区間の統合層序と放射年代

西弘嗣, 高嶋礼詩, 山中寿朗, 林圭一, 折橋裕二

日本地質学会学術大会講演要旨　126th　2019

ISSN： 1348-3935
白亜系海洋無酸素事変層準堆積岩の菌類パリノモルフ分析

池田雅志, 沢田健, 安藤卓人, 高嶋礼詩, 西弘嗣

日本地質学会学術大会講演要旨　126th　2019

ISSN： 1348-3935
中期始新世における北西大西洋中緯度域の海洋成層構造と炭酸塩生産フラックス変動

有元純, 西弘嗣, 黒柳あずみ, 高嶋礼詩, 松井浩紀, 池原実

日本地質学会学術大会講演要旨　126th　2019

ISSN： 1348-3935
仙台層群向山層の年代と広瀬川凝灰岩の給源

高嶋礼詩, 草川遥, 西弘嗣, 折橋裕二

日本地質学会学術大会講演要旨　126th　2019

ISSN： 1348-3935
浮遊性有孔虫記録を基にした白亜紀無酸素事変時の海洋環境推定

黒柳あずみ, 豊福高志, 長井裕季子, 木元克典, 西弘嗣, 高嶋礼詩, 川幡穂高

日本古生物学会例会講演予稿集　168th　2019
マイクロX線CT計測による自然環境下における大型底生有孔虫の成長速度と生殖状況の解明

木下峻一, HOHENEGGER Johann, 佐々木理, 黒柳あずみ, 高嶋礼詩, 西弘嗣

日本古生物学会例会講演予稿集　168th　2019
北海道苫前地域のセノマニアン/チューロニアン境界堆積岩の植物バイオマーカー分析による陸域古植生変動の復元

池田雅志, 沢田健, 安藤卓人, 中村英人, 高嶋礼詩, 西弘嗣

日本地球惑星科学連合大会予稿集(Web)　2019　ROMBUNNO.BCG07‐04 (WEB ONLY)　2019
ベトナム北部のドンバン地域に分布する上部デボン系トクタット層から産出するテンタキュリトイド

小松俊文, 浦川良太, 児子修司, 高嶋礼詩, 山口龍彦, PHONG Nguyen D.

日本古生物学会例会講演予稿集　167th　2018
フランスVocontian Basinの上部白亜系統合層序

西弘嗣, GYAWALI Babu Ram, 高嶋礼詩

日本古生物学会年会講演予稿集　2018　2018
ベトナム北部シーファイ峠に分布する上部デボン系のコノドント生層序

稲田稔貴, 小松俊文, 浦川良太, 前川匠, 高嶋礼詩, PHONG Nguyen D., HUNG Doan D.

日本古生物学会年会講演予稿集　2018　2018
北海道苫前地域のセノマニアン/チューロニアン境界堆積岩中のパイオニア植物バイオマーカーに記録された古環境変動

池田雅志, 沢田健, 安藤卓人, 中村英人, 高嶋礼詩, 西弘嗣

日本地球惑星科学連合大会予稿集(Web)　2018　ROMBUNNO.BPT06‐07 (WEB ONLY)　2018
Correlation of volcaniclastic rocks of the Middle Miocene calderas in Kii Peninsula based on apatite trace-element chemistry

Takashima Reishi, Wada Yutaka, Hoshi Hiroyuki, Shinjoe Hironao, Kudo Takashi, Nishi Hiroshi

Annual Meeting of the Geological Society of Japan　2018　(0)　162-162　2018
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.2018.0_162 　

ISSN： 1348-3935

More details Close

[Program canceled for a disaster] Program canceled for the 2018 Hokkaido Eastern Iburi earthquake. However, This abstract is quotable and viewable on PDF.
Paleoenvironmenal changes during the Hangenberg Event, Devonican-Carboniferous transition, Viet Nam

Nishi Hiroshi, Shizuya Atena, Oba Tadashi, Takashima Reishi, Ogata Yukari, Toshifumi Kamatsu

Annual Meeting of the Geological Society of Japan　2018　(0)　2018
Publisher: The Geological Society of Japan
ISSN： 1348-3935

More details Close

[Program canceled for a disaster] Program canceled for the 2018 Hokkaido Eastern Iburi earthquake. However, This abstract is quotable and viewable on PDF.
Paleoenvironmental and paleoecological variations recorded by lichen biomarkers in the sediments deposited across the Cenomanian-Turonian boundary in the Tomamae area, northern Hokkaido, Japan

Ikeda Masashi, Sawada Ken, Ando Takuto, Nakamura Hideto, Takashima Reishi, Nishi Hiroshi

Annual Meeting of the Geological Society of Japan　2018　(0)　323　2018
Publisher: 一般社団法人日本地質学会
DOI： 10.14863/geosocabst.2018.0_323 　

ISSN： 1348-3935

eISSN： 2187-6665
白亜紀無酸素事変時の環境が浮遊性有孔虫へ及ぼす影響

黒柳あずみ, 豊福高志, 長井裕季子, 長井裕季子, 木元克典, 西弘嗣, 高嶋礼詩, 川幡穂高

日本古生物学会年会講演予稿集　2017　25　2017/06/09
北部ベトナムのドンバン地域に分布する上部デボン系のフラスニアン・ファメニアン境界とケルワッサー事変

小松俊文, 浦川良太, 前川匠, 高嶋礼詩, 田中源吾, 山口龍彦, PHONG Nguyen D.

日本古生物学会年会講演予稿集　2017　2017
前期~中期中新世を通じた赤道太平洋温度躍層の発達史

松井浩紀, 西弘嗣, 黒柳あずみ, 林広樹, 池原実, 高嶋礼詩

日本地球惑星科学連合大会予稿集(Web)　2017　2017
Correlation and discrimination of Miocene-Pliocene pyroclastic flow and tephra deposits based on apatite trace-element chemistry

Takashima Reishi, Kuwabara Sato, Kusakawa Haruka, Wada Yutaka, Hoshi Hiroyuki, Shinjoe Hironao, Nishi Hiroshi

Annual Meeting of the Geological Society of Japan　2017　(0)　153-153　2017
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.2017.0_153 　

ISSN： 1348-3935

More details Close

 [Program canceled for typhoon] Program canceled for typhoon. However, This abstract is quotable and viewable on PDF.
Tephra stratigraphy and correlation of the Cretaceous Yezo Group in Hokkaido based on apatite trace-element chemistry

Kuwabara Sato, Takashima Reishi, Nishi Hiroshi

Annual Meeting of the Geological Society of Japan　2017　(0)　43-43　2017
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.2016.0_043 　

ISSN： 1348-3935

eISSN： 2187-6665

More details Close

Program canceled for typhoon. However, This presentation was performed on the special session. This abstract is quotable and viewable on PDF.
Pyrolysis of kerogen in black shales deposited during the mid-Cretaceous Oceanic Anoxic Events (OAE) 1a: Reconstruction of primary production

Ando Takuto, Sawada Ken, Takashima Reishi, Nishi Hiroshi

Annual Meeting of the Geological Society of Japan　2017　(0)　284　2017
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.2017.0_284 　

ISSN： 1348-3935

eISSN： 2187-6665
Age model and linkage between emplacement of LIPs and environmental change during the mid-Cretaceous Oceanic Anoxic Event 2

Nishi Hiroshi, Takashima Reishi

Annual Meeting of the Geological Society of Japan　2017　(0)　283　2017
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.2017.0_283 　

ISSN： 1348-3935

eISSN： 2187-6665
飼育実験に基づく硫化水素の浮遊性有孔虫への影響評価

黒柳あずみ, 豊福高志, 長井裕季子, 木元克典, 川幡穂高, 高嶋礼詩, 西弘嗣

日本古生物学会年会講演予稿集　2016　17　2016/06/24
北海道蝦夷層群における放散虫化石層序とその年代-浮遊性有孔虫・炭素同位体比・U-Pb年代との統合-

西弘嗣, 鈴木紀毅, 小安浩理, 高嶋礼詩, 山中寿郎

日本古生物学会例会講演予稿集　165th　2016
北大西洋域における前期漸新世から前期中新世の浮遊性有孔虫生層序および群集変化(IODP Exp.342)

松井浩紀, 西弘嗣, 高嶋礼詩, 黒柳あずみ, 品田拓真

日本古生物学会例会講演予稿集　165th　2016
ベトナム北部ハーザン省のシーファイ地域に分布するトックタット層のフラスニアン・ファーメニアン境界について

浦川良太, 小松俊文, 高嶋礼詩, 前川匠, PHONG Nguyen Duc

日本古生物学会年会講演予稿集　2016　2016
漸新世温暖期に生じた浮遊性有孔虫生息深度変化の緯度分布

松井浩紀, 西弘嗣, 黒柳あずみ, 高嶋礼詩, 池原実

日本古生物学会年会講演予稿集　2016　2016
アパタイトの化学組成に基づく白亜系蝦夷層群の凝灰岩標準層序

桑原里, 高嶋礼詩, 西弘詞, 折橋裕二

日本地質学会学術大会講演要旨　123rd　2016

ISSN： 1348-3935
東赤道太平洋域の温度躍層深化に伴う漸新世の浮遊性有孔虫生息深度変化

松井浩紀, 西弘嗣, 高嶋礼詩, 黒柳あずみ, 池原実, 高柳栄子, 井龍康文

日本地球惑星科学連合大会予稿集(Web)　2016　2016
中期白亜紀海洋無酸素事変OAE2における渦鞭毛藻による赤潮発生の検討

安藤卓人, 沢田健, 高嶋礼詩, 西弘嗣

日本地球惑星科学連合大会予稿集(Web)　2016　ROMBUNNO.BPT07‐05 (WEB ONLY)　2016
High-resolution stratigraphic correlation of Quaternary-Miocene tephra and pyroclastic flow deposits based on apatite trace-element chemistry

Takashima Reishi, Kuwabara Sato, Nishi Hiroshi, Hoshi Hiroyuki, Shinjoe Hironao, Wada Yutaka, Takemura Keiji

Annual Meeting of the Geological Society of Japan　2016　(0)　42-42　2016
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.2016.0_042 　

ISSN： 1348-3935
Linkage between the eruption of Large Igneous Province and environmental changes in the Northeast and Northwest Pacific Ocean during the Cretaceous Oceanic Anoxic Event

Nishi Hiroshi, Takashima Reishi, Yamanaka Toshiro

Annual Meeting of the Geological Society of Japan　2016　(0)　315　2016
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.2016.0_315 　

ISSN： 1348-3935

eISSN： 2187-6665
日出島に分布する下部白亜系宮古層群の堆積環境と産出化石

浦川良太, 小松俊文, 高嶋礼詩, 尾松圭太, 西弘嗣

日本古生物学会年会講演予稿集　2015　2015
中期白亜紀海洋無酸素事変時の主な海洋基礎生産者は何か?:海成ケロジェンからの証拠

安藤卓人, 沢田健, 高嶋礼詩, 西弘嗣

日本地球惑星科学連合大会予稿集(Web)　2015　ROMBUNNO.BPT25‐02 (WEB ONLY)　2015
Correlation and tephrochronology of tuffs based on trace element composition of apatite phenocrysts

TAKASHIMA Reishi, NISHI Hiroshi, KUWABARA Sato

Annual Meeting of the Geological Society of Japan　2015　(0)　30-30　2015
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.2015.0_030 　

ISSN： 1348-3935

eISSN： 2187-6665
Paleoenvironmental study and integrated stratigraphy of planktic and benthic foraminifera and radiolaria of the Cretaceous Yezo Group

Nishi Hiroshi, KOYASU Hiromichi, OMATSU Keita, Reishi TAKASHIMA

Annual Meeting of the Geological Society of Japan　2015　(0)　339-339　2015
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.2015.0_339 　

ISSN： 1348-3935
Marine primary producer communities reconstructed using aromatic steroids in the sedimentary rocks.

Ando Takuto, Sawada Ken, Takashima Reishi, Nishi Hiroshi

Abstracts of Annual Meeting of the Geochemical Society of Japan　62　(0)　2015
Publisher: GEOCHEMICAL SOCIETY OF JAPAN

More details Close

堆積岩中に普遍的に存在する三芳香環ステロイドを始めとした三芳香環ステロイドの同定を詳細に検討し，それらを用いた指標から海洋基礎生産者群集を復元した結果を報告する。 南東フランス・ボコンティアン堆積盆の白亜系海洋無酸素事変層準と北海道大夕張地域と苫前地域の白亜系蝦夷層群から採取した堆積岩試料を用い，GC-MSを用いて芳香族ステロイドの分析を行なった。三芳香環ステロイドの分離と同定は2種類の極性と長さの異なるカラムを用いることで可能にした。三芳香環ジノステロイドを用いたTADS（渦鞭毛藻指標）とC27 TAS（円石藻指標）を提案した。南東フランス試料では白亜紀における円石藻と渦鞭毛藻の競争関係とOAE極相期の富栄養で成層化した海洋における渦鞭毛藻の繁茂が示された。一方で北海道試料からは，現在同様に沿岸に近い海洋表層において渦鞭毛藻の生産性が高かったことが示唆された。
High-resolution stratigraphic correlation of the Upper Cretaceous Kuji Group based on carbon isotope stratigraphy and U-Pb radiometric dating

Arimoto Jun, Takashima Reishi, Nishi Hiroshi, Jyo Syota, Yamanaka Toshiro, Orihashi Yuji, Kouchi Yoshikazu, Yamamoto Koshi, Umetsu Keita

Annual Meeting of the Geological Society of Japan　2015　(0)　127-127　2015
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.2015.0_127 　

ISSN： 1348-3935
Origins of acritarchs found in sedimentary rocks deposited during the mid-Cretaceous Oceanic Anoxic Events (OAEs) and their contribution to primary production in the Cretaceous ocean.

Ando Takuto, Sawada Ken, Takashima Reishi, Nishi Hiroshi

Annual Meeting of the Geological Society of Japan　2015　(0)　263-263　2015
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.2015.0_263 　

ISSN： 1348-3935
Variations in redox condition of marine environment recorded by organic geochemical proxies in sedimentary rocks deposited across the Cenomanian-Turonian boundary in the Yezo Group, Hokkaido, Japan.

Ando Takuto, Sawada Ken, Nakamura Hideto, Miyata Yuma, Omatsu Keita, Takashima Reishi, Nishi Hiroshi

Annual Meeting of the Geological Society of Japan　2015　(0)　340-340　2015
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.2015.0_340 　

ISSN： 1348-3935
南東フランス・Vocontian堆積盆地における下部-上部白亜系境界付近の放散虫生層序の検討

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

日本古生物学会例会講演予稿集　163rd　2014
白亜系・蝦夷層群の統合層序とU-Pb年代

西弘嗣, 高嶋礼詩, 折橋裕二, 山中寿朗, 林圭一, 白井孝明, 藤森裕史, 今井利矩, 尾松圭太

日本古生物学会例会講演予稿集　163rd　2014
北海道の白亜系~漸新統の微化石・炭素同位体比層序・U-Pb年代と温室期北西太平洋の古環境イベント

西弘嗣, 高嶋礼詩, 山中寿朗, 折橋裕二, 林圭一

日本古生物学会年会講演予稿集　2014　2014
イベント層の識別と野外調査:ベトナムに分布する下部三畳系バックトゥイ層のスミシアン-スパシアン境界

小松俊文, 前川匠, 重田康成, 高嶋礼詩, HUYEN Dang Tran

日本古生物学会年会講演予稿集　2014　2014
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

日本古生物学会年会講演予稿集　2014　2014
Correlation of Cretaceous tuff beds based on heavy mineral chemistry

Takashima Reishi, Kuwabara Sato, Orihashi Yuji, Nishi Hiroshi

Annual Meeting of the Geological Society of Japan　2014　(0)　147-147　2014
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.2014.0_147 　

ISSN： 1348-3935
Paleoenvironmental change during the mid-Cretaceous Oceanic Anoxic Event 1b

Nishi Hiroshi, Ogawa Sohei, Takashima Reishi, Kuwahara Yoshihiro

Annual Meeting of the Geological Society of Japan　2014　(0)　2014
Publisher: The Geological Society of Japan
ISSN： 1348-3935
Tocopherol composition of sediments deposited during the Cenomanian/Turonian boundary in SE France and Hokkaido, Japan

Ando Takuto, Sawada Ken, Takashima Reishi, Nishi Hiroshi

Abstracts of Annual Meeting of the Geochemical Society of Japan　61　(0)　27-27　2014
Publisher: GEOCHEMICAL SOCIETY OF JAPAN
DOI： 10.14862/geochemproc.61.0_27 　

More details Close

北海道苫前地域の蝦夷層群堆積岩は低熟成で有機物の保存状態が良いが，このような低熟成な堆積岩と南東フランスVocontian堆積盆CTB層準の堆積岩から，藻類や陸上植物に由来する易分解性のトコフェロール（ビタミンE）を検出したので報告する。比較的低熟成なThomel層準の黒色頁岩試料，朱鞠内沢・大曲沢川の苫前地域試料の極性画分において，トコフェロール類が検出され，高熟成な大夕張地域白金沢試料からは全く検出されなかった。Thomel層準と大曲沢川ほとんどの試料でδ体が50％以上占め，朱鞠内沢試料ではα体が6～39％と比較的多く検出された。より低熟成な朱鞠内沢試料中においては，α体の分解が進んでおらず，組成の違いが生じた可能性がある。一方，各層準内での組成の変動については，堆積時のトコフェロール組成の違いを反映していると考えられる。
Depositional environment and variation in primary production during the Cenomanian-Turonian boundary reconstructed by organic geochemical analysis of sedimentary rocks from the Yezo Group, Tomamae area, Hokkaido, Japan

Ando Takuto, Nakamura Hideto, Sawada Ken, Takashima Reishi, Nishi Hiroshi

Annual Meeting of the Geological Society of Japan　2014　(0)　341-341　2014
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.2014.0_341 　

ISSN： 1348-3935
Recognition of vegetation change associated with negative d13C excursion at the bottom of the Cenomanian-Turonian boundary event: A molecular paleontological approach

Nakamura Hideto, Sawada Ken, Ando Takuto, Takashima Reishi, Nishi Hiroshi

Annual Meeting of the Geological Society of Japan　2014　(0)　342-342　2014
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.2014.0_342 　

ISSN： 1348-3935
Palynomorph analysis of black shales deposited during the mid-Cretaceous Oceanic Anoxic Events (OAEs): Reconstruction of primary producers

Takuto Ando, Sawada Ken, Takashima Reishi, Nishi Hiroshi

Annual Meeting of the Geological Society of Japan　2014　(0)　2014
Publisher: The Geological Society of Japan
ISSN： 1348-3935
ベトナム北東部に分布するフォーハン層のデボン紀-石炭紀境界

小松俊文, 平田健人, 高嶋礼詩, 田中源吾, PHUONG Ta H., HUYEN Dang T.

日本古生物学会例会講演予稿集　162nd　2013
赤道太平洋域における中新世から後期更新世までの浮遊性有孔虫化石群集(IODP Exp.320/321)

松井浩紀, 西弘嗣, 高嶋礼詩

日本古生物学会例会講演予稿集　162nd　2013
北海道東部に分布する根室層群における渦鞭毛藻シスト群集の変遷と古環境

林圭一, 西弘嗣, 高嶋礼詩

日本応用地質学会北海道支部・北海道応用地質研究会研究発表会講演予稿集　(33)　2013
Variations in marine ecosystem revealed from aryl isoprenoids in sedimentary rocks deposited during the Cretaceous Oceanic Anoxic Event 1b in SE France.

Ando Takuto, Sawada Ken, Nishi Hiroshi, Takashima Reishi

Abstracts of Annual Meeting of the Geochemical Society of Japan　60　(0)　2013
Publisher: GEOCHEMICAL SOCIETY OF JAPAN

More details Close

中期白亜紀は高海水準で非常に温暖な時代であり，有機物に富む黒色頁岩の堆積から幾度も海洋無酸素事変（Oceanic Anoxic Event; OAE）が起こったと推測されている。OAE1b（115～110Ma）は，テチス海を中心とした地域的なOAEであったとされ，Aptian/Albian境界を挟んで長期に渡って複数の黒色頁岩層が確認される。特に最盛期であるKilian層準・Paquier層準の黒色頁岩中からはメタン生成アーキア由来のPMI（2, 6, 10, 15, 19-ペンタメチルイコサン）などが検出されることから，「アーキアの海（Archaeal ocean）」が広がっていたとされている。本研究では，OAE1b層準の詳細なバイオマーカー分析を行い，アリルイソプレノイドに着目して起源を推察し，層準内におけるそれらの濃度変化から当時の海洋生態系の復元を試みた。
Carbon isotope stratigraphy and geologic age of theUpper Cretaceous Kuji Group

Jo Shota, Takashima Reishi, Nishi Hiroshi, Yamanaka Toshiro, Akiyama Fumitaka

Annual Meeting of the Geological Society of Japan　2013　(0)　2013
Publisher: The Geological Society of Japan
ISSN： 1348-3935
Cretaceous standard chronostratigraphic framework based on integrated stratigraphy of planktic foraminifer and carbon isotope and U-Pb age of the Yezo Group and the Vocontian Basin sequence

Nishi Hiroshi, Takashima Reishi, Orihashi Yuji, Yamanaka Toshiro, Iryu Yasufumi, Takayanagi Hideko, Hayashi Keiichi

Annual Meeting of the Geological Society of Japan　2013　(0)　364-364　2013
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.2013.0_364 　

ISSN： 1348-3935
High-resolution analysis of the mid-Cretaceous Oceanic Anoxic Event 1b in the Vocontian Basin, Southeast France

Ogawa Sohei, Takashima Reishi, Nishi Hiroshi, Iryu Yasufumi, Takayanagi Hideko

Annual Meeting of the Geological Society of Japan　2013　(0)　2013
Publisher: The Geological Society of Japan
ISSN： 1348-3935
Radiolarian biostratigraphy across the Lower to Upper Cretaceous boundary in the Vocontian Basin, SE France

Shirai Takaaki, Suzuki Noritoshi, Takashima Reishi, Nishi Hiroshi, Iryu Yasufumi, Ogawa Sohei, Takayanagi Hideko

Annual Meeting of the Geological Society of Japan　2013　(0)　2013
Publisher: The Geological Society of Japan
ISSN： 1348-3935
Preliminary study of Cretaceous tephrochronology in Japan

Takashima Reishi, Kuwabara Sato, Nishi Hiroshi, Orihashi Yuji, Hayashi Keiichi

Annual Meeting of the Geological Society of Japan　2013　(0)　367-367　2013
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.2013.0_367 　

ISSN： 1348-3935
Lower Cretaceous radiolarian biostratigraphy in the Northwest Pacific, Hokkaido, Japan

Koyasu Hiromichi, Suzuki Noritoshi, Nishi Hiroshi, Takashima Reishi

Annual Meeting of the Geological Society of Japan　2013　(0)　2013
Publisher: The Geological Society of Japan
ISSN： 1348-3935
Devastation and recovery of terrestrial vegetation during three mass extinctions: Evidence from biomarkers

Kaiho Kunio, Saito Ryosuke, Mizukami Takuya, Ito Kosuke, Yatsu Susumu, Ogata Yukari, Oba Masahiro, Takashima Reishi, Komatsu Toshifumi

Annual Meeting of the Geological Society of Japan　2013　(0)　2013
Publisher: The Geological Society of Japan
ISSN： 1348-3935
Effect of terrestrial runoff on the ocean anoxic events spanning the end-Devonian extinction: Evidence from biomarkers

Ogata Yukari, Kaiho Kunio, Oba Masahiro, Takashima Reishi, Komatsu Toshifumi, Hirata Kento

Annual Meeting of the Geological Society of Japan　2013　(0)　2013
Publisher: The Geological Society of Japan
ISSN： 1348-3935
Albian integrated stratigraphy of planktic foraminifera and carbon isotope in Yubari and Mikasa areas, Hokkaido, Japan.

Fujimori Hirofumi, Takashima Reishi, Nishi Hiroshi, Yamanaka Toshiro

Annual Meeting of the Geological Society of Japan　2013　(0)　2013
Publisher: The Geological Society of Japan
ISSN： 1348-3935
Stratigraphic correlation between the shallow marine and hemipelagic sequences based on the integrated stratigraphy of planktic foraminifera, carbon isotope and tuff of the Cretaceous Yezo Group.

Imai Toshinori, Takashima Reishi, Nishi Hiroshi, Yamanaka Toshiro

Annual Meeting of the Geological Society of Japan　2013　(0)　2013
Publisher: The Geological Society of Japan
ISSN： 1348-3935
Paleoenvironmental change across the mid-Cretaceous Oceanic Anoxic Event 2 based on benthic foraminiferal assemblage in the Northwest Pacific.

Omatsu Keita, Nishi Hiroshi, Takashima Reishi, Yamanaka Toshiro

Annual Meeting of the Geological Society of Japan　2013　(0)　2013
Publisher: The Geological Society of Japan
ISSN： 1348-3935
Comparison of planktic foraminifer biostratigraphy and assemblages in the eastern equatorial Pacific from Middle to Late Miocene

Matsui Hiroki, Nishi Hiroshi, Takashima Reishi

Annual Meeting of the Geological Society of Japan　2013　(0)　372-372　2013
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.2013.0_372 　

ISSN： 1348-3935

eISSN： 2187-6665
Correlation of the tuff beds in the Cretaceous Yezo Group in Hokkaido

Kuwabara Sato, Takashima Reishi, Nishi Hiroshi, Hayashi Keiichi

Annual Meeting of the Geological Society of Japan　2013　(0)　630　2013
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.2013.0_630 　

ISSN： 1348-3935

eISSN： 2187-6665
夕張地域下部白亜系,海洋無酸素事変相当層準の堆積岩のバイオマーカー分析

中村英人, 沢田健, 高嶋礼詩

堆積学研究　71　(3)　241　2012/12/28

ISSN： 1342-310X
ステロイドバイオマーカーを用いた中期白亜紀海洋無酸素事変時の渦鞭毛藻生産の復元

安藤卓人, 沢田健, 西弘嗣, 高嶋礼詩

日本古生物学会年会講演予稿集　2012　32　2012/06/15
中期白亜紀海洋無酸素事変(OAE)1b層準の堆積岩におけるケロジェン分析:陸源有機物輸送の評価

安藤卓人, 沢田健, 岡野和貴, 小刀禰宅朗, 横山龍, 西弘嗣, 高嶋礼詩

日本堆積学会大会プログラム・講演要旨　2012　23　2012/06/15
夕張地域下部白亜系,海洋無酸素事変相当層準の堆積岩のバイオマーカー分析

中村英人, 沢田健, 高嶋礼詩

日本堆積学会大会プログラム・講演要旨　2012　26　2012/06/15
北太平洋域の上部白亜系における放散虫化石群集の変遷

小安浩理, 西弘嗣, 鈴木紀毅, 高嶋礼詩

日本古生物学会例会講演予稿集　161st　2012
北西太平洋域における古第三紀前期の海洋一次生産の変化

林圭一, 西弘嗣, 高嶋礼詩

日本古生物学会年会講演予稿集　2012　2012
Reconstructon of variations in marine ecosystem during the mid-Cretaceous Oceanic Anoxic Events 2 (Cenomanian / Turonian boundary) in the Vocontian basin, SE France.

Ando Takuto, Sawada Ken, Nishi Hiroshi, Takashima Reishi

Abstracts of Annual Meeting of the Geochemical Society of Japan　59　(0)　2012
Publisher: GEOCHEMICAL SOCIETY OF JAPAN

More details Close

中期白亜紀の海洋では，無酸素水塊が拡大し有機物の大量埋積が起きたと考えられ，黒色頁岩の堆積によって示されるこれらの事変は「海洋無酸素事変（OAE）」と呼ばれている。OAE2は中期白亜紀で最も海洋の無酸素化が進んだイベントであり，汎世界的に黒色頁岩の堆積が認められている。OAE2の黒色頁岩からはシアノバクテリアや嫌気性光合成細菌由来のバイオマーカーが検出されることから，これらの基礎生産者が支配的な'Cyanobacterial ocean'であったと考えられてきた。しかし，最近の演者らの研究から，南仏のOAE2期においては，渦鞭毛藻の海洋生産への寄与を表すTDSI'（Triaromatic dinosterane index）が中期白亜紀のOAE層準中で最も高くなることが明らかになり，渦鞭毛藻の寄与もOAE2時に高まった可能性が示されている。本研究では，OAE2層準試料において詳細にバイオマーカー分析し，海洋環境変動や生物応答を復元することで当時の海洋生態系変動の詳細な検討を行った。
The dinoflagellate cyst stratigraphy and the history of paleo-productivity in the Paleogene Nemuro Group.

Hayashi Keiichi, Nishi Hiroshi, Takashima Reishi

Annual Meeting of the Geological Society of Japan　2012　(0)　178-178　2012
Publisher: 一般社団法人日本地質学会
DOI： 10.14863/geosocabst.2012.0_178 　

ISSN： 1348-3935

eISSN： 2187-6665
Correlation of the Albian/Cenomanian boundary between Japan and France

Takashima Reishi, Nishi Hiroshi, Yamanaka Toshiro, Iryu Yasufumi, Takayanagi Hideko, Hayashi Keiichi, Koyasu Hiromichi, Ogawa Sohei

Annual Meeting of the Geological Society of Japan　2012　(0)　194-194　2012
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.2012.0_194 　

ISSN： 1348-3935
白亜紀の古海洋変動

西弘嗣, 高嶋礼詩, 山中寿朗

日本古生物学会例会講演予稿集　160th　2011
北海道中央部に分布する中生界の岩石磁気

伊藤康人, 高嶋礼詩, 美藤祐貴, 井上貴至

日本地質学会学術大会講演要旨　118th　2011

ISSN： 1348-3935
Devonian to Carboniferous transition in the Pho Han Formation in northern Vietnam-A preliminary assessment

Komatsu, T, Takashima, R, Naruse, H, Ta, H.P, Dang, T.H, Nguyen, D.P, Ho, T.C, Tran T.V, Kato, S, Maekawa, T

Proceedings of the second Asia-Pacific Geoparks Network Symposium　2011
Integrated stratigraphy and geologic age of the upper Albian – lower Cenomanian sequences exposed in South France and Hokkaido, Japan

Takashima Reishi, Nishi Hiroshi, Yamanaka Toshiro, Quidelleur Xavier, Paquette J. L, Fiet Nicolas

Annual Meeting of the Geological Society of Japan　2011　(0)　215-215　2011
Publisher: 一般社団法人日本地質学会
ISSN： 1348-3935
Contribution of dinoflagellate for marine primary production during the mid-Cretaceous oceanic anoxic events : evaluation by aromatic dinosteroids.

Ando Takuto, Sawada Ken, Okano Kazuki, Nishi Hiroshi, Takashima Reishi

Abstracts of Annual Meeting of the Geochemical Society of Japan　58　(0)　87-87　2011
Publisher: 一般社団法人日本地球化学会
DOI： 10.14862/geochemproc.58.0.87.0 　

More details Close

中期白亜紀OAEに関する従来の研究では，海洋表層の基礎生産において，シアノバクテリアなどの特異的な生物の基礎生産における寄与について説明されてきた．一方，最近の演者らの研究によると，OAE中，必ずしもそれらの生物のみが基礎生産を担っていた訳ではないということが分かってきた．本研究では，当時の主要な基礎生産者のうち，特に渦鞭毛藻に着目し，そのバイオマーカーを用いて，OAE1aとOAE1bにおける，渦鞭毛藻の基礎生産への寄与の評価を試みた．渦鞭毛藻由来のバイオマーカーとしては，ジノステランが用いられるが，白亜系OAE試料のような続成が進んだ試料からの検出・同定が難しいため，芳香族画分でおもなピークとして検出される芳香族ジノステロイドに注目し，それらを用いた指標を検討し，各OAEにおける海洋生態系の違いを示した．
Paleoenvironments of the Oceanic Anoxic Event 2 in the Tethyan and Pacific regions

Nishi Hiroshi, Takashima Reishi, Toshiro Yamanaka, Hayashi Keiichi, Mochiduki Sunao, Koyasu Hiromichi

Annual Meeting of the Geological Society of Japan　2011　(0)　216-216　2011
Publisher: The Geological Society of Japan
ISSN： 1348-3935
北海道中央部に分布する隈根尻層群・空知層群の古地磁気.

伊藤康人, 高嶋礼詩, 美藤祐貴, 井上貴至

日本地質学会学術大会講演要旨　117th　2010

ISSN： 1348-3935
3.8.2.微化石に基づく九州沖縄の新生界の対比

高嶋礼詩

九州沖縄地方　170-171　2010
北海道白亜系堆積岩中の被子植物分子化石~古植生指標の検討

中村英人, 沢田健, 高嶋礼詩

日本古生物学会年会講演予稿集　2009　46　2009/06/26
Integrated bio- and carbon isotope stratigraphy of the Yezo Group and high-resolution international stratigraphic correlations

Nishi Hiroshi, Takashima Reishi, Yamanaka Toshiro, Hayashi Keiichi

Annual Meeting of the Geological Society of Japan　2009　(0)　116-116　2009
Publisher: 一般社団法人日本地質学会
DOI： 10.14863/geosocabst.2009.0.116.0 　

ISSN： 1348-3935

eISSN： 2187-6665
O-169 Examination of the use of angiosperm biomarkers to clarify the timing of angiosperm appearance in the Lower Cretaceous of Hokkaido, Japan

Nakamura Hideto, Sawada Ken, Takashima Reishi

日本地質学会学術大会講演要旨　115　(0)　115-115　2008/09/15
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.2008.0.226.0 　

ISSN： 1348-3935

eISSN： 2187-6665
O-73 Integrated stratigraphy and paleoenvironmental analysis of the Cretaceous Cenomanian/Turonian boundary succession in the Vocontian Basin, SE France

Takashima R, Nishi H, Hayashi K, Kawahata H, Yamanaka T

日本地質学会学術大会講演要旨　115　68-68　2008/09/15
Publisher: The Geological Society of Japan
Stratigraphy and geologic time of the Upper Cretaceous Himenoura Group in Kamiamakusa, Kumamoto Prefecture.

岩本忠剛, 小松俊文, 高橋修, 高嶋礼詩, 西弘嗣

日本古生物学会例会講演予稿集　157th (Web)　2008
Geologic time of the Upper Cretaceous Himenoura Group in the southern parts of Amakusa, Kumamoto Prefecture.

近藤謙介, 小松俊文, 岩本忠剛, 高嶋礼詩, 西弘嗣, 高橋修

日本古生物学会例会講演予稿集　157th (Web)　2008
Paleoproductivity of bacteria and archaea reconstructed by biomarker analyses of black shales of mid-Cretaceous oceanic anoxic event 1a and 1b.

Okano Kazuki, Sawada Ken, Takashima Reishi, Nishi Hiroshi

Abstracts of Annual Meeting of the Geochemical Society of Japan　55　(0)　20-20　2008
Publisher: 一般社団法人日本地球化学会
DOI： 10.14862/geochemproc.55.0.20.0 　

More details Close

白亜紀には、世界中の海洋が同時期に無酸素化した海洋無酸素事変（OAE）が数回起こったと考えられている。本研究では、南東フランスのボコンチアン堆積盆におけるOAE1aおよびOAE1bの黒色頁岩試料を用いてバイオマーカー分析を行った。OAE1aではシアノバクテリア由来の2-メチルホパンが顕著に検出され、その濃度が上位に向かって増加する傾向が見られた。これは、海洋の無酸素化に伴う脱窒や嫌気的メタン酸化の活発化によってシアノバクテリアが卓越しやすい環境が形成されたことに起因する可能性が考えられる。一方OAE1bではアーキア由来のバイオマーカーであるPMIやTMIが検出された。しかし、これらのバイオマーカーはKilianより上位では高濃度で検出されるものの、それより下位の黒色頁岩層からは検出されず、一般に言われるOAE1bにおけるアーキアの卓越がKilian以降のものである可能性が考えられ、その原因については考察中である。
S-109 High resolution analysis for the OAE 1b Paquier level in the Vocontian Basin, SE France

Takashima R, Nishi H, Okada H, Sakamoto T, Ohkouchi N, Kawabe F, Yamanaka T, Hasegawa T

日本地質学会学術大会講演要旨　114　56-56　2007/09/01
Publisher: The Geological Society of Japan
O-36 Geology and the foraminiferal biostratigraphy of the upper Cretaceous sequence in Tomiuchi-Azumi area, southern central Hokkaido

Hayashi Keiichi, Nishi Hiroshi, Takashima Reishi, Tomosugi Takashige

日本地質学会学術大会講演要旨　114　79-79　2007/09/01
Publisher: The Geological Society of Japan
Paleoenvironmental change based on the analysis of the Cretaceous benthic foraminiferal assemblages in the Northeast Pacific

Nishi Hiroshi, Tomosugi Takashige, Takashima Reishi, Allan Fernand, Tanabe Kazushige, Moriya Kazuyoshi

Annual Meeting of the Geological Society of Japan　2007　(0)　108-108　2007
Publisher: 一般社団法人日本地質学会
ISSN： 1348-3935
Aromatic thiophene and furan analyses in Cretaceous sediments deposited during Oceanic Anoxic Event in southeast France

Okano Kazuki, Sawada Ken, Takashima Reishi, Nishi Hiroshi

Abstracts of Annual Meeting of the Geochemical Society of Japan　53　(0)　172-172　2006
Publisher: GEOCHEMICAL SOCIETY OF JAPAN
DOI： 10.14862/geochemproc.53.0.172.0 　

More details Close

海洋無酸素事変 (OAE) は海洋中に無酸素環境が広がる全球的なイベントであり、海洋の生態系に大きな被害を与え
Biomarker compositions of black shales deposited during Oceanic Anoxic Events of Lower Cretaceous in Southern France

岡野和貴, 沢田健, 高嶋礼詩, 岡田尚武, 西弘嗣, 鈴木徳行, 飯島耕一, 坂本竜彦, 加藤憲二, 木村浩之

日本地球化学会年会講演要旨集　52nd (Web)　2005
南フランスにおける白亜紀無酸素事変(OAE1b)の高分解能解析

西弘嗣, 高嶋礼詩, 岡田尚武, 永井啓資, FREIDRICH Oliver, 坂本竜彦, 大河内直彦, BEAUFORD Luc, FABIENNE Giraud, 長谷川卓, 川幡穂高

日本古生物学会年会講演予稿集　2005 (Web)　2005
北海道大夕張地域の上部アルビアン階~下部セノマニアン階の化石層序:北太平洋の白亜紀化石年代学・古海洋学の構築に向けて

川辺文久, 高嶋礼詩, 和仁良二, 西弘嗣, 守屋和佳

日本古生物学会例会講演予稿集　153rd (Web)　2004
南フランスにおける白亜紀後期の無酸素事変

坂本竜彦, 西弘嗣, 永井啓資, 吉田卓哉, 吉山泰樹, 古川麻里子, 岡田尚武, 高嶋礼詩, 長谷川卓, 山村充, 黒柳あずみ, 川幡穂高, 大河内直彦

日本古生物学会例会講演予稿集　152nd (Web)　2003
中央ネパール,シワリーク帯のDwar Kholaドレライト(1.7Ga)の岩石化学的特徴 (総特集ヒマラヤ山脈の構造と上昇過程) Peer-reviewed

折橋裕二, 酒井治孝, 高嶋礼詩

月刊地球　24　(4)　272-278　2002/04
Publisher: 海洋出版
ISSN： 0387-3498
Geology and Stratigraphy of Sorachi and Yezo Groups in the Tokyo University Forests in Hokkaido, Japan.

Takashima, R, Miyamoto, Y, Nishi, H, Yoshida, T

Bulletin of the Tokyo University Forests　(108)　57-76　2002
Earliest Cretaceous radiolarian assemblages from a deep borehole section in the southern Ishikari Plain, central Hokkaido, and their implications

SUZUKI Noritoshi, KURITA Hiroshi, TAKASHIMA Reishi

Annual Meeting of the Geological Society of Japan　1999　307　1999
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.1999.0_307_2 　

ISSN： 1348-3935

eISSN： 2187-6665
Where were "Orbitolina limestones" in central Hokkaido deposited?

SANO Shin-ichi, TAKASHIMA Reishi

Annual Meeting of the Geological Society of Japan　1999　309　1999
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.1999.0_309_1 　

ISSN： 1348-3935

eISSN： 2187-6665
Geology and petrological characteristics of the Sorachi Group distributed in the Yubari Mountains, Hokkaido, Japan.

Takashima Reishi, Yoshida Takeyoshi

Annual Meeting of the Geological Society of Japan　158　158　1999
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.1999.0_158_1 　

ISSN： 1348-3935

eISSN： 2187-6665
Recognition of the carbon isotopic fluctuation correctable with OAE1a in the uppermost part of the Sorachi Group exposed along the Ashibetsu River, Hokkaido

ANDO Atsushi, NISHI Hiroshi, KAKEGAWA Takeshi, TAKASHIMA Reishi, SAITO Tsunemasa

Annual Meeting of the Geological Society of Japan　1998　(0)　53-53　1998
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.1998.0_053 　

ISSN： 1348-3935
北海道空知層群を構成するジュラ紀末期-白亜紀前期の島弧火山岩類.

高嶋礼詩

地球惑星科学関連学会講演予稿集　620　1997
Geology and planktonic foraminiferal biostratigraphy of Cretaceous strata distributed along the Shuparo River, Hokkaido, Japan

TAKASHIMA R.

Journal of the Geological Society of Japan　103　543-563　1997
66 Geology and planktonic foraminiferal biostratigraphy of the Cretaceous strata in the Shuparo River, Hokkaido, Japan

Takashima Reishi

Annual Meeting of the Geological Society of Japan　110　110　1996
Publisher: The Geological Society of Japan
DOI： 10.14863/geosocabst.1996.0_110_1 　

ISSN： 1348-3935

eISSN： 2187-6665

Show all ︎Show first 5

Books and Other Publications 6

Encyclopedia of Paleontology

2023/01

ISBN: 9784621307588
海洋底科学の基礎

日本地質学会「海洋底科学の基礎」編集委員会

共立出版　2016/09

ISBN: 9784320047297
日本地方地質誌北海道地方

高嶋礼詩, 安藤寿男, 西弘嗣

朝倉書店　2010/11/25

ISBN: 9784254167818
日本地方地質誌九州・沖縄地方

高嶋礼詩, 上栗慎一, 西弘嗣

朝倉書店　2010/07/20

ISBN: 9784254167887
古生物学辞典第二版

日本古生物学会編集

朝倉書店　2010/06/01

ISBN: 9784254162653
地球の変動と生物進化

西弘嗣, 高嶋礼詩

北海道大学出版会　2008/03/31

Show all Show first 5

Presentations 4

日本とフランスにおける白亜系Albian/Cenomanian境界の対比

日本地質学会台119回学術大会　2012/09/14
南フランスと北海道に露出する上部アルビアン～下部セノマニアンの統合層序と地質年代

高嶋礼詩, 西弘嗣, 山中寿朗, Quidelleur X, Paquette J.L, Fiet N

日本地質学会　2011/09/09
Upper Jurassic Ophiolite and overlying Lower Cretaceous volcanic sediments exposed in Hokkaido, Japan International-presentation

Nishi, H, Yoshida, T

Japanese-Russian Workshop Symposium “Northern Pacific-Rim Ophiolites and their Ocean-Floor Analogues”　2011/02/08
Planktonic foraminiferal zonation in the Cretaceous Yezo group, Hokkaido, Japan

H. Nishi, R. Takashima, T. Hatsugai, A. Ennyu, T. Sakai, T. Saito

Fossils　2000/01/01

Research Projects 17

Establishment of the Global Standard Cretaceous Time Scale and Cretaceous palaeoenvironmental changes in the Northwest Pacific

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

2025/04/01 - 2030/03/31
Environmental changes during the Latest Cretaceous Mass Extinction Event recorded in the complete K/Pg boundary sequence discovered firstly in East Asia

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2021/04 - 2025/03
Forest devastation during extreme greenhouse climate

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2020/04 - 2024/03
Paleoenvironmental studies of terrestrial and marine sequences in Northwest Pacific region during Paleocene-Eocene Thermal Maximum.

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

Category: Grant-in-Aid for Scientific Research (C)

Institution: Hokkaido Research Organization

2020/04 - 2023/03
Recovery from mass extinction and adaptive radiation of Paleozoic and Mesozoic marine biotic community in Southeast Asia

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

Category: Grant-in-Aid for Scientific Research (C)

Institution: Kumamoto University

2019/04 - 2023/03
Improvement of Cretaceous Geologic Time Scale

Takashima Reishi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

Category: Fund for the Promotion of Joint International Research (Fostering Joint International Research (B))

Institution: Tohoku University

2018/10 - 2022/03

More details Close

Based on detailed bio-, carbon- and osmium isotope stratigraphy, we identified the basal horizons of the Cretaceous stages of Aptian, Albian, Cenomanian, Turonian, Coniacian, Santonian and Campanian as well as Oceanic Anoxic Event 1a horizon in the Yezo Group, Hokkaido, Japan. We also analyzed radiometric ages (U-Pb ages of zircon and 39Ar-40Ar ages of sanidine) of tuffs intercalated near the above cited stage boundaries and event horizons. Our result greatly improved numerical ages of Cretaceous stage boundaries as well as paleoenvironmental events.
High resolution age model and paleoenvironmental change for K/Pg boundary

Takashima Reishi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: Tohoku University

2017/04 - 2020/03

More details Close

The Cretaceou/Paleogene (K/Pg) boundary Event, occurred at 66 million years ago, is one of the most famous extinction events in the earth’s history, and is characterized by dying out dinosaur and ammonites. Our study discovered a continuous succession from the uppermost Cretaceous to the basal part of Paleocene in the Nemuro Group at Kawaruppu section based on planktic foraminifers, calcareous nannofossils and carbon isotope stratigraphy. We also identified prominent positive peak of iridium and platinum contents at the K/Pg boundary strata in the studied sequence. The K/Pg boundary at Kawaruppu section is 1 m thick strata which is considered to be the thickest K/Pg boundary muddy strata in the world. High resolution study of this strata has a potential to clarify detailed faunal and environmental change in the western North Pacific region during the K/Pg boundary Event.
Paleozoic and Mesozoic ocean anoxic events, mass extinctions, recovery and adaptive radiations in Southeast Asia

Komatsu Toshifumi, Nguyen Duc Phong, Doan Dinh Hung

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: Kumamoto University

2016/04 - 2019/03

More details Close

We conducted Paleozoic and Mesozoic geological research in Vietnam and Japan and were very successful, especially in the Upper Devonian to Lower Carboniferous Toc Tat Formation, and the Lower Triassic Bac Thuy Formation, Vietnam, and in Silurian, Devonian, and Lower Triassic strata in Japan. In particular, we obtained much good geological, paleontological, and sedimentological data in the Toc Tat Formation, which intercalates with horizons of the Upper Devonian Frasnian-Famennian boundary mass-extinction event and in the Bac Thuy and Taho formations containing the Lower Triassic Smithian-Spacian boundary extinction events, and these excellent data have been published by several journals.
Reconstruction of paleo-environment in the Northwest Pacific during extreme greenhouse periods

Nishi Hiroshi, Selby David

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (A)

Category: Grant-in-Aid for Scientific Research (A)

Institution: Tohoku University

2012/04 - 2017/03

More details Close

Mid-Cretaceous Oceanic Anoxic Events 2 and 1a are known as the extreme greenhouse climate periods. In order to understand paleo-environmental in the Northwest Pacific during OAE 2, 1a, we examined microfossil assemblage, carbon- and osmium isotope stratigraphy and clay mineral crystallinity of the OAE 2 and 1a intervals exposed in Japan. In the OAE 2 period, the emplacement of Large Igneous Provinces released large amounts of CO2 which induced a remarkable wet climate in the eastern margin of the Asian continent. Delivery of a large amount of nutrients from the land to the ocean caused elevation of primary productivity in the ocean surface, and resulted in depletion of oxygen in the ocean. The depletion oxygen continued relatively short period of time less than 100,000 years. On the other hand, in the OAE 1 a, anoxic environments in the ocean lasted over one million years in the Northeast Pacific.
Establishment of high-resolution Cretaceous chronostratigraphy and tephrochronology in Japan

Takashima Reishi, NISHI Hiroshi, YAMANAKA Toshiro, ORIHASHI Yuji, KURODA Jun-ichiro, MATSUBARA Takashi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2013/04 - 2016/03

More details Close

In order to establish high-resolution international Cretaceous chronostratigraphic framework, we studied 206Pb/238U zircon geochronology of the 30 tuff beds that occur in the Yezo Group, Hokkaido, Japan. The 206Pb/238U ages of tuffs in the Yezo Group show that Aptian-Campanian interval ranges from 120 to 84 million years ago. Furthermore, we extracted apatite phenocrysts from the tuff beds, and analyzed trace element chemistry of the apatites. Based on the contents of magnesium and chlorine in the apatites of the tuffs in the Yezo Group, we found four tuff beds that are traceable throughout Hokkaido.
Extinction to recovery intervals in the Paleozoic and Mesozoic ocean anoxic events, eastern Tethys

Komatsu Toshifumi, Takashima Reishi, Shigeta Yasunari

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

Institution: Kumamoto University

2013/04 - 2016/03

More details Close

We geologically investigated in the Paleozoic and Mesozoic fields, Southeast and East Asia, mainly in the Devonian to Carboniferous and Permian to Triassic in Vietnam. We revealed geologic ages in detail on the basis of conodont biostratigraphic data, and reported mass extinction events and global anoxic to dysoxic events around Devonian-Carboniferous boundary (DCB), the Lower Triassic Induan-Olenekian boundary (IOB) and Smithian-Spathian boundary (SSB). The depositional environments and fossil assemblages in several sections intercalating with DCB, SSB and IOB were reconstructed by facies analysis and paleosynecological study methods. Finally we discussed about natural histories of marine organisms after extinction events thorough recovery intervals to adaptive radiations each depositional environments.
Precise reconstruction of variation in paleovegetation during Cretaceous hot period by analyses of terrestrial plant-derived organic molecules in sediments

SAWADA Ken, TAKASHIMA Reishi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

Category: Grant-in-Aid for Scientific Research (C)

Institution: Hokkaido University

2011 - 2013

More details Close

The objective of this study is to reconstruct long time scale variations in paleovegetation and terrestrial paleoenvironment by analyses of terrestrial plant-derived biomarkers and kerogens in sedimentary rocks from the Cretaceous Yezo Group, Hokkaido, Japan. In particular, we found rapid changes in angiosperm / gymnosperm vegetation ratio and coniferous vegetation evaluated by analysis of terrestrial plant terpenoid biomarkers. Moreover, we suggest that composition of long chain n-alkanols released from resistant macromolecule in kerogen can be useful as an indicator of deciduous broad leaf plant vegetation. Variation in the paleovegetation using the long chain n-alkanols released from kerogen is almost synchronous to that in angiosperm / gymnosperm vegetation using terrestrial plant biomarkers, confirming high applicability of the released n-alkanol proxy for reconstructing paleovegetation from ancient sediment.
Verification of the mid-Cretaceous "Mega-monsoon Event"

NISHI Hiroshi, SAWADA Ken, KAWAHATA Hodaka, TAKASHIMA Reishi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)

Category: Grant-in-Aid for Scientific Research (B)

Institution: Tohoku University

2010 - 2012

More details Close

Expansion of anoxic environments and extinction of marine biota occurred in the Tethys Sea and the Atlantic Ocean during the earliest Albian period, mid-Cretaceous (113 million years ago). In order to understand the trigger and mechanism of this event, we analyzed microfossil assemblages, organic and inorganic geochemistry and clay mineralogy of the black shale which were deposited during this event. Our analyses demonstrate that the expansions of anoxic environment were triggered by increased continental run-off which was caused by extremely humid climate in response to the mid-Cretaceous global warming. Increased run-off may have caused surface ocean eutrophication and elevation of primary productivity, and resulted in expansion of anoxia.
Establishment of the Cretaceous standard, integrated stratigraphy in the North Pacific

NISHI Hiroshi, TAKASHIMA Reishi, SAWADA Ken

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research

Category: Grant-in-Aid for Scientific Research (C)

2009 - 2011

More details Close

I established detailed biostratigraphy of planktonic foraminifera and dinoflagerata systs in the Aptian-Maastrichtian sequence of the Yezo and Nemuro Groups exposed in Hokkaido, Japan. Based on above biostratigraphic correlations, I integrated carbon and strontium isotope stratigraphy and 12 U-Pb and 40Ar/39Ar radiometric dating of tuff beds This integrated stratigraphy has enabled to high resolution international stratigraphic correlations.
High resolution analysis of the Cretaceous Oceanic Anoxic Events in France

TAKASHIMA Reishi

Offer Organization: Japan Society for the Promotion of Science

System: Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

Category: Grant-in-Aid for Young Scientists (B)

2006 - 2008
ヒマラヤ変成帯の上昇とナップの前進プロセスの研究

高嶋礼詩

Offer Organization: 日本学術振興会

System: 科学研究費助成事業特別研究員奨励費

Category: 特別研究員奨励費

2001 - 2003

More details Close

今年度はヒマラヤ山脈と同様の衝突帯である,ヨーロッパアルプス西縁部のフランスプロバンス地域と日高山脈西縁部の北海道中軸帯において,白亜系の構造地質学的・層序学的検討を昨年度に引き続き行った. 1)フランス南東部の研究結果フランス南東部のDigne周辺地域は,第三紀のアルプス造山活動によって,白亜系が東傾斜の軸を持つ南北性の褶曲と東傾斜の南北性の衝上断層群による変形を被っている.同地域の白亜系について,微化石を用いて詳細な年代を解明することにより,衝上断層による地層の欠損量を定量的に計測した.また,白亜系を不整合に覆う前縁山地堆積物の時空分布から,同地域における衝突に伴う構造運動の時空変遷を考察した. 2)北海道中軸部の研究結果衝突帯の前縁部である夕張山地から石狩低地帯に至る地域と,幌加内・朱鞠内から羽幌・小平にいたる地域の2箇所で,広域で詳細な地質図を完成させた.特に前者の地域では塊状泥岩が卓越し,岩相的に単調であるために,同地域の構造を把握することはこれまで全くなされてこなかった.しかしながら,微化石による精密な化石基準面を同定し,それらを広域にマッピングすることにより,岩相上識別不能な同一時間面をトレースすることが出来た.また,夕張山地の白亜系の泥岩中には,数10層の凝灰岩層も挟まれているが,各凝灰岩を識別することが困難なために,鍵層として用いられることもなかった.しかし,各化石基準面と組み合わせることにより,他の地域(羽幌・小平)にまで対比できることが明らかになった.これらの鍵層・化石基準面に基づく地質構造の解析の結果,双珠別衝上断層,芦別岳衝上断層,桂沢衝上断層という,3つの大規模な衝上断層を発見した.さらにこれらの断層によって,それぞれ10km以上の短縮が起こっていたことを解明した.以上の結果により,日高山脈西縁部の複雑な褶曲・衝上断層構造が復元され,島弧衝突帯前縁部における構造を解明することが出来た.この結果の一部をCretaceous Researchに投稿し,受理されている. これまで行ってきた,ヒマラヤ山脈,アルプス山脈,日高山脈の研究結果から,大陸間,島弧間の衝突過程における山脈の形成と,衝上断層の発達過程を比較検討した.その結果,島弧間の衝突では,前縁山地の地質体における衝上断層系の発達のみであるが,大陸衝突では,地殻深部の変成岩ナップの大規模な前進が起こり,前縁山地堆積物に変成を起こしながらのし上がっていくことが明らかになった.
北海道の白亜紀テクトニクスと島弧火成活動史

高嶋礼詩

Offer Organization: 日本学術振興会

System: 科学研究費助成事業特別研究員奨励費

Category: 特別研究員奨励費

Institution: 東北大学

1998 - 1999

Show all Show first 5

Social Activities 1

富良野広域圏経済活性化協議会

2010/06/17 -

More details Close

「富良野の地質・地形の成り立ち」というタイトルで講演を行うとともに，野外観察会を開いた．

Other 3

白亜紀中期の地球超温暖化事件における環境・生態系変動の解明

More details Close

白亜紀中期の9410～9385万年前には，現在に匹敵する急速な二酸化炭素濃度の増加による“超温暖化事件”が起こった．本研究は，この時期に堆積した地層の堆積物の化学組成，微化石群集，化石の殻の安定同位体組成などを高解像度で解析することにより，当時の陸域，浅海～深海のそれぞれ異なる環境でどのように気候・環境・生態系が変化したかを高解像度で解析する「極限温暖期の全環境復元」を行っている．
白亜紀中期の超温暖化イベント発生期における環境・生態系への影響の解明

More details Close

・近年，大気中の二酸化炭素濃度の増加による地球温暖化とそれに伴う環境変動について盛んに議論がなされているが，未だ温暖化によって各地域が受ける影響については明らかになっていない．・白亜紀中期の9300万年前には，現在に匹敵する急激な大気中二酸化炭素濃度の増加と温暖化が発生し，その結果，海洋表層は酸性化し，海洋中～深層は無酸素化した．・このイベントは海洋無酸素事変と呼ばれ，およそ80万年間持続し，海洋生物の大量絶滅を引き起こした．・本研究では，太平洋とその沿岸地域における海洋無酸素事変発生時の古環境，古気候変動と，それに伴う生物相の変化を詳細に解明し，将来の地球温暖化が引き起こす環境・生態系への影響を予測することを目的とする．・白亜紀当時の北西，北東太平洋とその沿岸の陸上で堆積した地層は，現在，日本の北海道中央部と北米カリフォルニア北部地域に広く露出しており，それぞれ，蝦夷層群，グレートバレー層群と名付けられている．・本研究では，蝦夷層群とグレートバレー層群を対象に野外調査を実施し，海洋無酸素事変が発生したときに堆積した地層から高解像度（2～3千年の分解能）で堆積岩試料や化石試料を採集する．・採集した堆積岩に含まれる各種微化石群集の解析，有機物の炭素同位体比の測定，堆積物の堆積構造，硫黄，鉄，各種微量元素の含有量，オスミウム同位体比の測定を行う．上記の検討により，海洋無酸素事変の詳細な発生期間と，発生期間内における海洋表層～深層の水温，栄養塩濃度，溶存酸素量の変化を推定することが可能となる．・陸成層から産出する植物化石については，葉の気孔密度を測定する．葉の気孔密度は大気中二酸化炭素濃度によって変化することから，当時の大気中二酸化炭素濃度の変化を推定することが可能である．・以上の結果を統合し，海洋無酸素事変発生時において，二酸化炭素濃度の変化に伴って，気温，海洋の各深度の水温や環境，生物相がどのように変遷したのかを明らかにする．・これらの結果を踏まえ，現在の地球において，二酸化炭素濃度の増加は，今後，日本を含む北太平洋とその周辺地域の環境にどのような変化が起こりうるかを予測する．・さらに，どれくらいの二酸化炭素濃度（何ppm）が海洋無酸素事変のような急激な環境変化を引き起こす閾値になるのかを明らかにし，二酸化炭素排出量制限の数値目標に関する提言を行っていきたい．・現在までのところ，北海道の蝦夷層群の海洋無酸素事変層準において野外調査を実施済みで，およそ1000試料の堆積岩試料を採取し，微化石の群集解析，有機物の炭素同位体比，有機炭素，硫黄，鉄の含有量の測定を終了している．また，オスミウム同位体比については，イギリスのDurham大学のSelby博士と共同で測定を開始している．・各種微化石分析，有機炭素，硫黄，鉄，微量元素組成については
植物化石の炭素同位体を基にした日本とヨーロッパの白亜系高解像度年代対比

More details Close

本研究費により，白亜系の模式地であるフランス南東部のボコンチアン堆積物と北海道の蝦夷層群との年代を浮遊性有孔虫化石層序と植物化石の炭素同位体比変動曲線を併用することにより高解像度で対比することが可能となった．