Details of the Researcher

PHOTO

Toshiro Nagase
Section
The Center for Academic Resources and Archives
Job title
Associate Professor
Degree
  • 博士(理学)(東北大学)

  • 理学修士(東北大学)

Research History 16

  • 2019/04 - Present
    海洋研究開発機構 協力研究員

  • 2007/04 - Present
    東北大学 学術資源研究公開センター 准教授

  • 1998/04 - Present
    Tohoku University

  • 2018/04 - 2020/03
    Okayama University of Science

  • 2016/04 - 2020/03
    Miyagi University of Education

  • 2017/04 - 2018/03
    Yamaguchi University

  • 2016/04 - 2017/03
    Kochi University

  • 2014/04 - 2015/03
    熊本大学大学院自然科学研究科 非常勤講師

  • 2008/04 - 2010/03
    独立行政法人大学入試センター 教科科目第一委員会委員 委員

  • 2008/04 - 2008/10
    宮城教育大学 非常勤講師

  • 2006/04 - 2007/03
    東北大学 学術資源研究公開センター 助教授

  • 2003/04 - 2006/09
    宮城教育大学 非常勤講師

  • 1998/04 - 2006/03
    東北大学 総合学術博物館 助教授

  • 1991/04 - 1998/03
    Tohoku University 助手

  • 1990/04 - 1991/03
    日本板硝子株式会社 研究員

  • 1998/04 -
    東北大学 理学研究科 助教授

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Education 2

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

    - 1990/03

  • Tohoku University Faculty of Science 地学第二

    - 1988/03

Committee Memberships 33

  • 日本鉱物科学会 理事

    2018/09 - Present

  • 日本鉱物科学会 和文誌編集委員会 委員長

    2016/09 - Present

  • 石川町(福島県) 文化財保存活用検討部会委員

    2016/07 - Present

  • 仙台市科学館協議会 協議会委員

    2014/04 - Present

  • 仙台市天文台運営協議会 協議会委員

    2014/03 - Present

  • 鉱物科学会 博物館委員会 委員

    2012/04 - Present

  • 日本鉱物科学会 博物館委員会 委員

    2012/04 - Present

  • 日本鉱物科学会 編集委員会委員

    2008/10 - Present

  • 日本鉱物科学会 理事

    2017/09 - 2018/09

  • 日本鉱物科学会論文賞選考委員会 委員長

    2015/10 - 2017/09

  • 日本鉱物科学会 評議委員

    2014/10 - 2017/09

  • 日本鉱物科学会 和文誌編集委員会 委員

    2008/10 - 2016/09

  • 仙台市 科学館協議会 協議会委員

    2012/04 - 2014/03

  • 仙台市天文台運営協議会 協議会委員

    2010/12 - 2014/03

  • 日本鉱物科学会論文賞選考委員会 委員長

    2012/09 - 2013/09

  • 日本鉱物科学会応用鉱物科学賞選考委員会 委員

    2012/09 - 2013/09

  • 日本鉱物科学会論文賞選考委員会 委員長

    2012/09 - 2013/09

  • 日本鉱物科学会応用鉱物科学賞選考委員会 委員

    2012/09 - 2013/09

  • 日本鉱物科学会 評議委員

    2010/10 - 2013/09

  • 日本鉱物科学会 会計監査委員

    2008/04 - 2012/10

  • 第59回仙台市児童・生徒理科作品展審査会 第59回仙台市児童・生徒理科作品展審査委員

    2012/09 - 2012/09

  • 日本鉱物科学会論文賞選考委員会 委員

    2011/09 - 2012/09

  • 鉱物科学会 地球惑星科学連合学会選出プログラム委員

    2008/04 - 2012/06

  • 鉱物科学会 地球惑星科学連合学会選出プログラム委員

    2008/04 - 2012/06

  • 仙台市 科学館協議会 協議会委員

    2010/04 - 2012/03

  • 日本鉱物科学会 行事委員

    2008/10 - 2010/09

  • 独立行政法人 大学入試センター 教科科目第一委員

    2008/04 - 2010/03

  • 日本鉱物学会 評議委員

    2004/04 - 2008/10

  • 日本岩石鉱物鉱床学会 編集委員会委員

    2003/04 - 2008/10

  • 日本鉱物学会 行事委員

    2004/04 - 2008/09

  • 国際鉱物学連合(IMA) IMA2006-Kobe組織委員会委員

    2004/04 - 2006/10

  • 仙台市科学館 第60回仙台市児童・生徒理科作品展審査委員

    2013/09 -

  • 第58回仙台市児童・生徒理科作品展審査会 第58回仙台市児童・生徒理科作品展審査委員

    2011/09 -

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Professional Memberships 3

  • 資源地質学会

  • アメリカ鉱物学会(The Mineralogical Society of America)

  • 日本鉱物科学会

Research Interests 5

  • Texture of minerals

  • Mineral diversity

  • Natural History

  • Crystallography

  • Mineralogy

Research Areas 3

  • Humanities & social sciences / Museology /

  • Humanities & social sciences / Cultural properties /

  • Natural sciences / Solid earth science /

Awards 2

  1. 日本鉱物科学会櫻井賞

    2013/09/13 日本鉱物科学会

  2. 日本鉱物科学会表彰

    2013/09/13 日本鉱物科学会

Papers 143

  1. Hitachiite, Pb5Bi2Te2S6, a new mineral from the Hitachi mine, Ibaraki Prefecture, Japan Peer-reviewed

    Takahiro Kuribayashi, Toshiro Nagase, Tatsuo Nozaki, Junichiro Ishibashi, Kazuhiko Shimada, Masaaki Shimizu, Koichi Momma

    Mineralogical Magazine 83 (5) 733-739 2019/10

    Publisher: Mineralogical Society

    DOI: 10.1180/mgm.2019.45  

    ISSN: 0026-461X

    eISSN: 1471-8022

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    <title>Abstract</title>Hitachiite, Pb5Bi2Te2S6, is a new mineral discovered in the Hitachi mine, located in the Ibaraki Prefecture of Japan. The mean of 21 electron microprobe analyses gave: Pb 52.01, Bi 23.06, Fe 0.69, Sb 0.17, Te 13.74, S 9.71, Se 0.54, total 100.04 wt.%. The empirical chemical formula based on 15 apfu is (Pb4.75Fe0.23)Σ4.98(Bi2.09Sb0.03)Σ2.12Te2.04(S5.73Se0.13)Σ5.86, ideally Pb5Bi2Te2S6. Synchrotron single-crystal X-ray diffraction experiments indicated that hitachiite has trigonal symmetry, space group <italic>P</italic><inline-formula><alternatives><inline-graphic xmlns:xlink="http://www.w3.org/1999/xlink" mime-subtype="gif" xlink:type="simple" xlink:href="S0026461X19000458_inline1" /><tex-math>${\bar 3}$</tex-math></alternatives></inline-formula><italic>m</italic>1, with <italic>a</italic> = 4.2200(13) Å, <italic>c</italic> = 27.02(4) Å and <italic>Z</italic> = 1. The four strongest diffraction peaks shown in the powder X-ray pattern [<italic>d</italic>, Å (<italic>I</italic>)(<italic>hkl</italic>)] are: 3.541(35)(012), 3.391(59)(013), 3.039(100)(015) and 2.114(56)(110). The calculated density (<italic>D</italic>calc) for the empirical chemical formula is 7.54 g/cm3. The crystal structure of hitachiite has been refined using synchrotron single-crystal X-ray diffraction data, to <italic>R</italic> = 7.38% and is based on <italic>ABC</italic>-type stacking of 15 layers (five Pb, two Bi, two Te, and six S layers) along the [001] direction, and with each layer ideally containing only one kind of atom. The stacking sequence is described as Te–Bi–S–Pb–S–Pb–S–Pb–S–Pb–S–Pb–S–Bi–Te. The discovery of hitachiite implies that the minerals of the Bi2Te2S–PbS join might form a homologous series of Bi2Te2S·<italic>n</italic>PbS.

  2. Rapid growth of mineral deposits at artificial seafloor hydrothermal vents Peer-reviewed

    Tatsuo Nozaki, Jun Ichiro Ishibashi, Kazuhiko Shimada, Toshiro Nagase, Yutaro Takaya, Yasuhiro Kato, Shinsuke Kawagucci, Tomoo Watsuji, Takazo Shibuya, Ryoichi Yamada, Tomokazu Saruhashi, Masanori Kyo, Ken Takai

    Scientific Reports 6 22163 2016/02/25

    DOI: 10.1038/srep22163  

    ISSN: 2045-2322

    eISSN: 2045-2322

  3. Evidence for biogenic graphite in early archaean isua metasedimentary rocks Peer-reviewed

    Yoko Ohtomo, Takeshi Kakegawa, Akizumi Ishida, Toshiro Nagase, Minik T. Rosing

    Nature Geoscience 7 (1) 25-28 2014

    DOI: 10.1038/ngeo2025  

    ISSN: 1752-0894

    eISSN: 1752-0908

  4. Discovery of seifertite in a shocked lunar meteorite Peer-reviewed

    Masaaki Miyahara, Shohei Kaneko, Eiji Ohtani, Takeshi Sakai, Toshiro Nagase, Masahiro Kayama, Hirotsugu Nishido, Naohisa Hirao

    Nature Communications 4 (1737) 2013

    DOI: 10.1038/ncomms2733  

    ISSN: 2041-1723

    eISSN: 2041-1723

  5. Tanohataite, LiMn2Si3O8(OH): a new mineral from the Tanohata mine, Iwate Prefecture, Japan Peer-reviewed

    Toshiro NAGASE, Hidemichi HORI, Mizuya KITAMINE, Mariko NAGASHIMA, Ahmadjan ABDURIYIM, Takahiro KURIBAYASHI

    Journal of Mineralogical and Petrological Sciences 107 (3) 149-154 2012

    DOI: 10.2465/jmps.111130  

    ISSN: 1345-6296

    eISSN: 1349-3825

  6. New silica clathrate minerals that are isostructural with natural gas hydrates Peer-reviewed

    Koichi Momma, Takuji Ikeda, Katsumi Nishikubo, Naoki Takahashi, Chibune Honma, Masayuki Takada, Yoshihiro Furukawa, Toshiro Nagase, Yasuhiro Kudoh

    NATURE COMMUNICATIONS 2 (196) 2011/02

    DOI: 10.1038/ncomms1196  

    ISSN: 2041-1723

  7. Microscopic evidence for nanoparticle-mediated growth of native gold in sulfide deposits at the Higashi–Aogashima Knoll Caldera hydrothermal field

    Satoshi Okada, Junji Torimoto, Takahiro Kuribayashi, Toshiro Nagase, Akira Owada, Jun-ichiro Ishibashi, Akiko Makabe, Yutaro Takaya, Tatsuo Nozaki

    PLOS ONE 20 (1) e0317220-e0317220 2025/01/17

    Publisher: Public Library of Science (PLoS)

    DOI: 10.1371/journal.pone.0317220  

    eISSN: 1932-6203

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    Gold (or electrum) in hydrothermal fluid precipitates directly from gold sulfide complex and/or partly via suspended nanoparticles. The hydrothermal fluid contains “invisible gold” that is atomically dispersed in sulfide minerals or as nanoparticles with a size of less than 10 nm. However, the contribution of these gold nanoparticles to the formation of native gold and its alloy with silver (electrum) remains unclear. The Higashi–Aogashima Knoll Caldera hydrothermal field, south of Tokyo, Japan, is an area of significant seafloor hydrothermal activity that is known for high-grade gold-containing minerals in sulfide-rich rocks. In this study, dry-polished thin sections were created to minimize sample damage and scanning and transmission electron microscopy were used to investigated the cross-sectional and three-dimensional morphologies of native gold grains in a sulfide-rich mound rock from the Central Cone site of the caldera. The surfaces of the gold grains comprised nanoparticles with sizes of 5–50 nm that were also attached to their periphery, which suggests that gold nanoparticles in deep-sea hydrothermal fluid were involved in the mineralization of the gold. In addition, the distribution of silver was uneven within the gold grains, which suggests that the gold precipitation comprised multiple stages at different temperatures that resulted in the post-deposition or secondary remobilization of silver.

  8. Subseafloor sulphide deposit formed by pumice replacement mineralisation Peer-reviewed

    Tatsuo Nozaki, Toshiro Nagase, Yutaro Takaya, Toru Yamasaki, Tsubasa Otake, Kotaro Yonezu, Kei Ikehata, Shuhei Totsuka, Kazuya Kitada, Yoshinori Sanada, Yasuhiro Yamada, Jun-ichiro Ishibashi, Hidenori Kumagai, Lena Maeda

    Scientific Reports 11 (1) 2021/12

    Publisher: Springer Science and Business Media LLC

    DOI: 10.1038/s41598-021-87050-z  

    eISSN: 2045-2322

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    <title>Abstract</title>Seafloor massive sulphide (SMS) deposits, modern analogues of volcanogenic massive sulphide (VMS) deposits on land, represent future resources of base and precious metals. Studies of VMS deposits have proposed two emplacement mechanisms for SMS deposits: exhalative deposition on the seafloor and mineral and void space replacement beneath the seafloor. The details of the latter mechanism are poorly characterised in detail, despite its potentially significant role in global metal cycling throughout Earth’s history, because in-situ studies require costly drilling campaigns to sample SMS deposits. Here, we interpret petrographic, geochemical and geophysical data from drill holes in a modern SMS deposit and demonstrate that it formed via subseafloor replacement of pumice. Samples from the sulphide body and overlying sediment at the Hakurei Site, Izena Hole, middle Okinawa Trough indicate that sulphides initially formed as aggregates of framboidal pyrite and matured into colloform and euhedral pyrite, which were replaced by chalcopyrite, sphalerite and galena. The initial framboidal pyrite is closely associated with altered material derived from pumice, and alternating layers of pumiceous and hemipelagic sediments functioned as a factory of sulphide mineralisation. We infer that anhydrite-rich layers within the hemipelagic sediment forced hydrothermal fluids to flow laterally, controlling precipitation of a sulphide body extending hundreds of meters.

  9. Rectifying characteristics of semiconductor minerals: A model on seismo-electromagnetic radiation mechanism from ore bodies

    Naoto Kaneko, Mitsuyuki Ozawa, Jun Muto, Hiroyuki Nagahama, Toshiro Nagase

    Physics of the Earth and Planetary Interiors 315 2021/06

    DOI: 10.1016/j.pepi.2021.106694  

    ISSN: 0031-9201

  10. Formation of highly Zn-enriched sulfide scale at a deep-sea artificial hydrothermal vent, Iheya-North Knoll, Okinawa Trough

    Tatsuo Nozaki, Toshiro Nagase, Junji Torimoto, Yutaro Takaya, Jun-ichiro Ishibashi, Kazuhiko Shimada, Masayuki Watanabe, Yuka Masaki, Koichi Iijima, Kazuya Kitada, Masafumi Saitoh, Takahiro Yokoyama, Keita Akiyama, Noriaki Sakurai, Tomokazu Saruhashi, Masanori Kyo, Hidenori Kumagai, Lena Maeda

    Mineralium Deposita 56 (5) 975-990 2021/06

    Publisher: Springer Science and Business Media LLC

    DOI: 10.1007/s00126-020-01022-3  

    ISSN: 0026-4598

    eISSN: 1432-1866

  11. Microbial sulfate reduction plays an important role at the initial stage of subseafloor sulfide mineralization

    Tatsuo Nozaki, Toshiro Nagase, Takayuki Ushikubo, Kenji Shimizu, Jun-ichiro Ishibashi

    Geology 49 (2) 222-227 2021/02/01

    Publisher: Geological Society of America

    DOI: 10.1130/g47943.1  

    ISSN: 0091-7613

    eISSN: 1943-2682

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    <title>Abstract</title> Seafloor hydrothermal deposits form when hydrothermal fluid mixes with ambient seawater, and constituent sulfide minerals are usually interpreted to precipitate abiogenically. Recent research drilling at Izena Hole and Iheya North Knoll in the middle Okinawa Trough (East China Sea), combined with secondary ion mass spectrometry determinations of δ34S in pyrite grains, provides compelling evidence that the initial stage of subseafloor sulfide mineralization is closely associated with microbial sulfate reduction. During the sulfide maturation process, pyrite textures progress from framboidal to colloform to euhedral. Pyrite δ34S has highly negative values (as low as –38.9‰) in framboidal pyrite, which systematically increase toward positive values in colloform and euhedral pyrite. Sulfur isotope fractionation between seawater sulfate (+21.2‰) and framboidal pyrite (–38.9‰) is as great as –60‰, which can be attained only by microbial sulfate reduction in an open system. Because framboidal pyrite is commonly replaced by chalcopyrite, galena, and sphalerite, framboidal pyrite appears to function as the starting material (nucleus) of other sulfide minerals. We conclude that framboidal pyrite, containing microbially reduced sulfur, plays an important role at the initial stage of subseafloor sulfide mineralization.

  12. Bosoite, a new silica clathrate mineral from Chiba Prefecture, Japan Peer-reviewed

    Koichi Momma, Takuji Ikeda, Toshiro Nagase, Takahiro Kuribayashi, Chibune Honma, Katsumi Nishikubo, Naoki Takahashi, Masayuki Takada, Yoshitaka Matsushita, Ritsuro Miyawaki, Satoshi Matsubara

    Mineralogical Magazine 84 (6) 2020

    Publisher: Cambridge University Press

    DOI: 10.1180/mgm.2020.91  

    ISSN: 1471-8022

  13. Additional thylacocephalans (Arthropoda) from the Lower Triassic (upper Olenekian) Osawa Formation of the South Kitakami Belt, Northeast Japan Peer-reviewed

    Masayuki Ehiro, Osamu Sasaki, Harumasa Kano, Toshiro Nagase

    Palaeoworld 28 (3) 320-333 2019/09

    DOI: 10.1016/j.palwor.2019.03.001  

    ISSN: 1871-174X

  14. Site occupancy of Fe2+, Fe3+ and Ti4+ in titanomagnetite determined by valence-difference contrast in synchrotron X-ray resonant scattering Peer-reviewed

    Maki Okube, Taro Oshiumi, Toshiro Nagase, Ritsuro Miyawaki, Akira Yoshiasa, Satoshi Sasaki, Kazumasa Sugiyama

    Journal of Synchrotron Radiation 25 (6) 1694-1702 2018/11

    DOI: 10.1107/S1600577518013954  

    ISSN: 0909-0495

    eISSN: 1600-5775

  15. Texture analyses of pseudomorphs of silica minerals

    Nagase Toshiro, Momma Koichi, Ishibashi Takashi, Hamane Daisuke Nishio-, Kuribayashi Takahiro

    Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences 2018 (0) 38-38 2018

    Publisher: Japan Association of Mineralogical Sciences

    DOI: 10.14824/jakoka.2018.0_38  

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    Metastable phases of silica minerals, which are opal, cristobalite, moganite, melanophlogite, chibaite, etc, precipitate under low-temperature hydrothermal solutions. The metastable silica minerals change to the stable phase quartz. After the phase transition, the crystal shapes remain intact, and pseudomorphs after the metastable minerals are observed. We carried out crystallographical analyses for the textures of the pseudomorphs after the metastable minerals by using scanning and transmission electron microscopes and EBSD method.

  16. 14C wiggle-matching age of a wood trunk in the lahar deposits caused by the 10th century eruption at the northern foot of Baitoushan volcano, China/North Korea Peer-reviewed

    Emi Sawada, Katsuhiko Kimura, Shinya Yatsuzuka, Toshio Nakamura, Tsuyoshi Miyamoto, Mitsuhiro Nakagawa, Toshiro Nagase, Hitoshi Kanno, Xu Jin, Mitsuru Okuno

    Fukuoka University Science Reports 48 2018

  17. Hitachiite, IMA 2018-027 Peer-reviewed

    T. Kuribayashi, T. Nagase, T. Nozaki, J. Ishibashi, K. Shimada, K. Momma, M. Shimizu

    Mineralogical Magazine 82 2018

  18. Texture and formation process of jasper, 'Nishiki-ishi' from Tsugaru region, Japan Peer-reviewed

    Toshiro Nagase, Shiori Ishikawa, Takahiro Kuribayashi

    Japanese Magazine of Mineralogical and Petrological Sciences 47 (3) 127-140 2018

    DOI: 10.2465/GKK.171018  

    ISSN: 1345-630X

    eISSN: 1349-7979

  19. Thermal behavior of modulated haüyne from Eifel, Germany: In situ high–temperature single–crystal X–ray diffraction study Peer-reviewed

    Takahiro KURIBAYASHI, Satoshi AOKI, Toshiro NAGASE

    Journal of Mineralogical and Petrological Sciences 113 (1) 51-55 2018

    Publisher: Japan Association of Mineralogical Sciences

    DOI: 10.2465/jmps.161114d  

    ISSN: 1345-6296

    eISSN: 1349-3825

  20. Crystallographic Analyses for Textures and Growth Processes of Minerals Peer-reviewed

    Toshiro NAGASE

    Nihon Kessho Gakkaishi 60 (1) 17-23 2018

    Publisher: The Crystallographic Society of Japan

    DOI: 10.5940/jcrsj.60.17  

    ISSN: 0369-4585

    eISSN: 1884-5576

  21. 日本鉱物科学会の国石選定事業と国石「ひすい」 Invited Peer-reviewed

    土`山 明, 宮脇 律郎, 宮島 宏, 長瀬 敏郎, 豊 遥秋, 坂野 靖行, 土谷 信高, 下林 典正

    Japanese Magazine of Mineralogical and Petrological Sciences 46 (3) 108-115 2017/10/07

    Publisher: Japan Association of Mineralogical Sciences

    DOI: 10.2465/gkk.46.H  

  22. Shock-induced P-T conditions and formation mechanism of akimotoite-pyroxene glass assemblages in the Grove Mountains (GRV) 052082 (L6) meteorite Peer-reviewed

    Lu Feng, Masaaki Miyahara, Toshiro Nagase, Eiji Ohtani, Sen Hu, Ahmed El Goresy, Yangting Lin

    American Mineralogist 102 (6) 1254-1262 2017/06/01

    DOI: 10.2138/am-2017-5905  

    ISSN: 0003-004X

    eISSN: 1945-3027

  23. Cation ordering in iridescent garnet from Tenkawa village, Nara prefecture, Japan Peer-reviewed

    Yurie Nakamura, Takahiro Kuribayashi, Toshiro Nagase, Hiroyuki Imai

    Journal of Mineralogical and Petrological Sciences 112 (2) 97-101 2017/04

    DOI: 10.2465/jmps.161114a  

    ISSN: 1345-6296

    eISSN: 1349-3825

  24. The crystal chemistry of sakuraiite Peer-reviewed

    Koichi Momma, Ritsuro Miyawaki, Satoshi Matsubara, Masako Shigeoka, Toshiro Nagase, Seiji Kamada, Shin Ozawa, Eiji Ohtani, Masaaki Shimizu, Akira Kato

    ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES 73 C910-C910 2017

    DOI: 10.1107/S2053273317086648  

    ISSN: 2053-2733

  25. Sakura texture in quartz crystals from Obira mine, Oita prefecture, Japan Peer-reviewed

    Toshiro Okada, Toshiro Nagase, Hiroyuki Imai, Seiichiro Uehara

    Japanese Magazine of Mineralogical and Petrological Sciences 46 (4) 117-123 2017

    DOI: 10.2465/gkk.170618  

    ISSN: 1345-630X

    eISSN: 1349-7979

  26. Kinetic effect on the cation-ordering of mineral in crystal growth process Peer-reviewed

    NAGASE Toshiro, KURIBAYASHI Takahiro, NAKAMURA Yurie

    Photon Factory Activity Reports 2016 Part B 34 154 2017

  27. High-pressure phase transition of lawsonite at ~4GPa Peer-reviewed

    OKAMOTO Keitaro, KURIBAYASHI Takahiro, NAGASE Toshiro

    34 227 2017

  28. Structural Properties of Al-replaced Phase D Peer-reviewed

    KURIBAYASHI Takahiro, INOUE Toru, NAGASE Toshiro

    2016 (Part B,34) 78 2017

  29. 乱れた構造を有する天然鉱物結晶の精密構造解析2

    栗林貴弘, 青木聡志, 折尾寛太, 長瀬敏郎, 杉山一正

    金属材料研究所平成28年度研究部共同研究報告書 268-269 2017

  30. Kinetic roughening of tapered quartz and formation of trapiche quartz from Goyomatsu mine, Nara prefecture

    Kawasaki Masayuki, Kato Mutsumi, Hiroi Mikuni, Miyawaki Ritsuro, Kagi Hiroyuki, Imai Hiroyuki, Nagase Toshiro

    Journal of The Gemmological Society of Japan 32 (1) 41-41 2016

    Publisher: The Gemmological Society of Japan

    DOI: 10.14915/gsjapan.32.1-4_41  

  31. Cation ordering of (110) and (211) sectors in grandite garnet from Mali Peer-reviewed

    Yurie Nakamura, Takahiro Kuribayashi, Toshiro Nagase

    Journal of Mineralogical and Petrological Sciences 111 (6) 385-397 2016

    DOI: 10.2465/jmps.160312  

    ISSN: 1345-6296

    eISSN: 1349-3825

  32. 乱れた構造を有する天然鉱物結晶の精密構造解析

    栗林貴弘, 青木聡, 長瀬敏郎, 杉山和正

    金属材料研究所平成27年度研究部共同研究報告書 2016

  33. An okenite-like mineral from Anijima Island, Ogasawara Islands, Tokyo, Japan Peer-reviewed

    Koichi Momma, Takashi Sano, Toshiro Nagase, Ritsuro Miyawaki, Satoshi Matsubara

    Bulletin of the National Museum of Nature and Science Series C 41 1-8 2015/12/22

  34. Unique large diamonds in a ureilite from Almahata Sitta 2008 TC<inf>3</inf> asteroid Peer-reviewed

    Masaaki Miyahara, Eiji Ohtani, Ahmed El Goresy, Yangting Lin, Lu Feng, Jian Chao Zhang, Philippe Gillet, Toshiro Nagase, Jun Muto, Masahiko Nishijima

    Geochimica et Cosmochimica Acta 163 (0) 14-26 2015/08/05

    DOI: 10.1016/j.gca.2015.04.035  

    ISSN: 0016-7037

    eISSN: 1872-9533

  35. Growth history and textures of quartz twinned in accordance with the Japan law Peer-reviewed

    Koichi Momma, Toshiro Nagase, Takahiro Kuribayashi, Yasuhiro Kudoh

    European Journal of Mineralogy 27 (1) 71-80 2015/02/01

    DOI: 10.1127/ejm/2014/0026-2411  

    ISSN: 0935-1221

    eISSN: 1617-4011

  36. Traces of the natural gas clathrate minerals found in Myogajima Island, Kushimoto, the southern tip of the Kii Peninsula, Japan. The quartz pseudomorph after melanophlogite

    Ishibashi Takashi, Nagase Toshiro, Monma Koichi, Shimobayashi Norimasa, Fukui Seiko, Ohara Masaaki

    Annual Meeting of the Geological Society of Japan 2015 399-399 2015

    Publisher: The Geological Society of Japan

    DOI: 10.14863/geosocabst.2015.0_399  

  37. Kuroko cultivation project using an artificial hydrothermal vent in the Iheya-North Knoll, Okinawa Trough

    Nozaki Tatsuo, Ishibashi Jun-Ichiro, Shimada Kazuhiko, Nagase Toshiro, Takaya Yutaro, Kato Yasuhiro, Kagucci Shinsuke, Watsuji Tomoo, Shibuya Takazo, Yamada Ryoichi, Saruhashi Tomokazu, Kyo Masanori, Takai Ken

    Annual Meeting of the Geological Society of Japan 2015 357-357 2015

    Publisher: The Geological Society of Japan

    DOI: 10.14863/geosocabst.2015.0_357  

  38. Kinetic roughening of tapered quartz and formation of trapiche quartz from Goyomatsu mine, Nara Prefecture

    Kawasaki Masayuki, Kato Mutsumi, Hiroi Mikuni, Miyawaki Ritsuro, Kagi Hiroyuki, Imai Hiroyuki, Nagase Toshiro

    Abstract of Papers Presented at Annual Meeting of the Gemmological Society of Japan 37 4-4 2015

    Publisher: The Gemmological Society of Japan

    DOI: 10.14915/gsj.37.0_4  

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    Natural tapered quartz crystals from Goyomatsu mine (Nara Prefecture) were observed by CL method. Their images show that the growth history was as follows, facet growth, cellular growth and adhesive-type growth, which were related to that of trapiche quartz.

  39. Tanohataite, a new mineral species, from the Tanohata mine, Iwate Prefecture, Japan Peer-reviewed

    Toshiro Nagase

    Japanese Magazine of Mineralogical and Petrological Sciences 43 (1) 37-39 2015

    DOI: 10.2465/gkk.131122  

    ISSN: 1345-630X

    eISSN: 1349-7979

  40. 低対称化した鉱物結晶に観察される秩序-無秩序構造に関する研究:分域の結晶構造に関して

    栗林貴弘, 長瀬敏郎, 中村友梨江, 杉山和正

    金属材料研究所平成26年度研究部共同研究報告書 172 2015

  41. Structural Properties of (Al, H)-Bearing Bridgmanite, MgSi0.9Al0.1H0.1O3.

    Kuribayashi, T, Inoue, T, Fujino, K, Nagase T

    Photon Factory Activity Reports 2014 Part B 32 152 2015

  42. Single crystal diffraction study on Al-bearing phase D.

    Kuribayashi, T, Inoue, T, Nagase, T

    Photon Factory Activity Reports 2014 Part B 32 137 2015

  43. Observation of pressure-induced phase transition of δ-AlOOH by using single-crystal synchrotron X-ray diffraction method Peer-reviewed

    Takahiro Kuribayashi, Asami Sano-Furukawa, Toshiro Nagase

    Physics and Chemistry of Minerals 41 (4) 303-312 2014/04

    DOI: 10.1007/s00269-013-0649-6  

    ISSN: 0342-1791

    eISSN: 1432-2021

  44. Cu, Zn and Pb secondary minerals at the southern coast in the Kii Peninsula, Japan (I)

    Ishibashi Takashi, Shimobayashi Norimasa, Matsubara Satoshi, Momma Koichi, Miyawaki Ritsuro, Shigeoka Masako, Tokumoto Akiko, Nagase Toshiro

    Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences 2014 (0) 39-39 2014

    Publisher: Japan Association of Mineralogical Sciences

    DOI: 10.14824/jakoka.2014.0_39  

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    Atacamaite, paratacamaite, diaboleite, cumengeite, laurionite and phosgenite occur as the secondary Cu and/or Pb minerals in oxidized zone of Cu-Zn-Pb&nbsp;veins at the southern coast in the Kii Peninsula. Among them diaboleite, cumengeite, laurionite and phosgenite are the first occurrence in Japan. These minerals are found as thin coatings and minute euhedral crystals along fissures in ore veins or mudstone at the intertidal zone.

  45. Cu, Zn and Pb secondary minerals at the southern coast in the Kii Peninsula, Japan (II)

    Matsubara Satoshi, Miyawaki Ritsuro, Monma Koichi, Shigeoka Masako, Tokumoto Akiko, Ishibashi Takashi, Shimobayashi Masanori, Nagase Toshiro

    Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences 2014 (0) 40-40 2014

    Publisher: Japan Association of Mineralogical Sciences

    DOI: 10.14824/jakoka.2014.0_40  

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    We have recognized cumengeite, diaboleite, phosgenite and laurionite as the first occurrence in Japan, at the southern coast in the Kii Peninsula, Kushimoto Town, Wakayama Prefecture. Among them cumengeite and diaboleite were examined by Gandolfi camera and electron probe microanalyzer (EDS). EDS analyses show a good agreement with that of the ideal formula for diaboleite, and distinct content of Zn replacing Cu for cumengeite.

  46. In situ high-temperature single-crystal X-ray diffraction study on scolecite

    栗林貴弘, 内田貴大, 長瀬敏郎

    東京工業大学共同利用研究報告書2013 - 2014 (18) 64-65 2014

  47. Single-crystal X-ray diffraction study on Al, H-bearing MgSiO3

    T. Kuribayashi, T. Inoue, K. Fujino, T. Nagase

    Photon Factory Activity Reports 2013 B (31) 299 2014

  48. Crystal structure analysis of postd-AlOOH at 8.2 GPa Peer-reviewed

    T. Kuribayashi, T. Inoue, K. Fujino, T. Nagase

    Photon Factory Activity Reports 31 310 2014

  49. 新規に合成されたAlに富む高圧含水相の結晶構造解析 Peer-reviewed

    栗林貴弘, 長瀬敏郎, 井上徹

    愛媛大学GRC, PRIUS2014年度研究成果報告書 2014

  50. 低対称化した鉱物結晶に観察される秩序-無秩序構造に関する研究 Peer-reviewed

    栗林貴弘, 長瀬敏郎, 中村友梨江, 杉山和正

    金属材料研究所平成25年度研究部共同研究報告書 2014

  51. Electromagnetic radiations from semiconductor minerals Peer-reviewed

    Mitsuyuki Ozawa, Jun Muto, Hiroyuki Nagahama, Toshiro Nagase

    The 2nd G-EVER International Symposium and the 1st IUGS & SCJ International Workshop on Natural Hazards Sendai, Japan, 19-20 Oct 2013 161-164 2013/10/19

  52. Electromagnetic radiations from semiconductor minerals Peer-reviewed

    Mitsuyuki Ozawa, Jun Muto, Hiroyuki Nagahama, Toshiro Nagase

    Proc. of 2nd G-EVER Symposium 160-163 2013/10/19

  53. Jadeite formation in shocked ordinary chondrites Peer-reviewed

    Masaaki Miyahara, Shin Ozawa, Eiji Ohtani, Makoto Kimura, Tomoaki Kubo, Takeshi Sakai, Toshiro Nagase, Masahiko Nishijima, Naohisa Hirao

    Earth and Planetary Science Letters 373 102-108 2013/07/01

    DOI: 10.1016/j.epsl.2013.04.023  

    ISSN: 0012-821X

  54. Texture of lutecite Peer-reviewed

    Toshiro Nagase, Koichi Momma, Takahiro Kuribayashi, Masahiko Tanaka

    Journal of Mineralogical and Petrological Sciences 108 (2) 87-93 2013/05

    DOI: 10.2465/jmps.111017  

    ISSN: 1345-6296

    eISSN: 1349-3825

  55. Shimazakiite-4M and shimazakiite-4O, Ca2B2O5, two polytypes of a new mineral from Fuka, Okayama Prefecture, Japan Peer-reviewed

    I. Kusachi, S. Kobayashi, Y. Takechi, Y. Nakamuta, T. Nagase, K. Yokoyama, K. Momma, R. Miyawaki, M. Shigeoka, S. Matsubara

    Mineralogical Magazine 77 (1) 93-105 2013/02

    DOI: 10.1180/minmag.2013.077.1.09  

    ISSN: 0026-461X

    eISSN: 1471-8022

  56. Crystal structures of swelling minerals Peer-reviewed

    T. Nagase, T. Kuribayashi, K.Momma, I. Kusachi

    Photon Factory Activity Reports 2012 30 246 2013

  57. The Effects of Pressure on the δ-AlOOH and Post-Transition Phase up to 14 Gpa Peer-reviewed

    T. Kuribayashi, A. Sano-Furukawa, T. Nagase

    Photon Factory Activity Reports 2012 30 243 2013

  58. Single Crystal X-Ray Diffraction Experiments of a Silica Clathrate Mineral Chibaite Peer-reviewed

    K. Momma, R. Miyawaki, T. Kuribayashi, T. Nagase

    Photon Factory Activity Reports 2012 30 244 2013

  59. Unique diamond in Almahatta Sitta ureilite. Peer-reviewed

    M. Miyahara, E. Ohtani, A. El Goresy, Y. T. Lin, L. Feng, J. C. Zhang, T. Nagase, M. Nishijima

    Meteoritics & Planetary Science 47 A279-A279 2012/07

    ISSN: 1086-9379

  60. The effects of pressure on crystal structure of δ-AlOOH up to 9.0 GPa Peer-reviewed

    T.Kuribayashi, A. Sano-Furukawa, T. Nagase

    Photon Factory Activity Reports 29 261 2012

  61. The bond lengths of T-O and M-O of natural spinel (MgAl_2O_4) and its relation to equilibration temperature

    NAGATA Sunao, KURIBAYASHI Takahiro, NAGASE Toshiro

    Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences 2011 209-209 2011/09/05

    Publisher: Japan Association of Mineralogical Sciences

    DOI: 10.14824/jakoka.2011.0.205.0  

    ISSN: 1348-6543

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    Spinel structure has two important sites; tetrahedral T-site and octahedral M-site. In the spinel series minerals, there is a relationship between the equilibration temperature and T-O and M-O lengths. The purpose of this study is tried to estimate the equilibration temperature of a natural spinel from Madagascar using T-O and M-O lengths. The chemical formula of this sample was determined as Mg0.94Fe0.04Al2.00O4 by EPMA analysis. Main crystallographic information were obtained by single crystal X-ray diffraction measurement as follows: the lattice constant (a) was 8.0915(6) Å, the oxygen fractional coordinates (u) was 0.26363(4). And the equilibration temperatures calculated from T-O and M-O lengths, which were corrected for the effect of iron, were 561 K and 585 K, respectively.

  62. Evidence for multiple dynamic events and subsequent decompression stage recorded in a shock vein Peer-reviewed

    Masaaki Miyahara, Eiji Ohtani, Makoto Kimura, Shin Ozawa, Toshiro Nagase, Masahiko Nishijima, Kenji Hiraga

    Earth and Planetary Science Letters 307 (3-4) 361-368 2011/07/15

    DOI: 10.1016/j.epsl.2011.05.010  

    ISSN: 0012-821X

    eISSN: 1385-013X

  63. First evidence for natural dissociation of olivine to silicate-perovskite and magnesiowustite in a shocked Martian meteorite DaG 735. Peer-reviewed

    M. Miyahara, E. Ohtani, S. Ozawa, M. Kimura, A. El Goresy, T. Sakai, T. Nagase, K. Hiraga, N. Hirao, Y. Ohishi

    Meteoritics & Planetary Science 46 A164-A164 2011/07

    ISSN: 1086-9379

  64. 'Ballen Quartz' from the Dhala Impact Structure and its Crystal Orientation Pattern by Electron Back Scattered Diffraction (EBSD) Peer-reviewed

    Y. Kuriyama, N. Nakamura, J. Muto, T. Nagase, J. K. Pati

    42nd Lunar and Planetary Science Conference 1608 1657 2011/05

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    42nd Lunar and Planetary Science Conference, held March 7-11, 2011 at The Woodlands, Texas. LPI Contribution No. 1608, p.1657

  65. Natural dissociation of olivine to (Mg,Fe)SiO3 perovskite and magnesiowustite in a shocked Martian meteorite Peer-reviewed

    Masaaki Miyahara, Eiji Ohtani, Shin Ozawa, Makoto Kimura, Ahmed El Goresy, Takeshi Sakai, Toshiro Nagase, Kenji Hiraga, Naohisa Hirao, Yasuo Ohishi

    PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 108 (15) 5999-6003 2011/04

    DOI: 10.1073/pnas.1016921108  

    ISSN: 0027-8424

  66. Melting and subsequent decompression processes recorded in a shock vein of an L6 chondrite. Peer-reviewed

    M. Miyahara, E. Ohtani, M. Kimura, S. Ozawa, T. Nagase, M. Nishijima, K. Hiraga

    Meteoritics & Planetary Science 45 A140-A140 2010/07

    ISSN: 1086-9379

  67. Liquidus high-pressure assemblages in shocked Martian shergottites: constrains to equilibrium peak shock-pressures and consequences to radiometric ages. Peer-reviewed

    A. El Goresy, M. Miyahara, S. Ozawa, E. Ohtani, Ph. Gillet, P. Beck, G. Montagnac, T. Nagase, K. Hiraga

    Meteoritics & Planetary Science 45 A50-A50 2010/07

    ISSN: 1086-9379

  68. First evidence for multi shock events on the L chondritic parent body. Peer-reviewed

    L. Feng, M. Miyahara, Y. Lin, E. Ohtani, A. E. Goresy, T. Nagase, S. Hu

    Meteoritics & Planetary Science 45 A53-A53 2010/07

    ISSN: 1086-9379

  69. Coherent and subsequent incoherent ringwoodite growth in olivine of shocked L6 chondrites Peer-reviewed

    Masaaki Miyahara, Eiji Ohtani, Makoto Kimura, Ahmed El Goresy, Shin Ozawa, Toshiro Nagase, Masahiko Nishijima, Kenji Hiraga

    EARTH AND PLANETARY SCIENCE LETTERS 295 (1-2) 321-327 2010/06

    DOI: 10.1016/j.epsl.2010.04.023  

    ISSN: 0012-821X

  70. Natural dissociation of olivine to perovskite and magnesiowustite in a Martian meteorite Peer-reviewed

    Miyahara M, Ohtani E, Ozawa S, Kimura M, El Goresy A, Sakai T, Nagase T, Hiraga K, Hirao N, Ohishi Y

    Annual report of Bayerisches Forschungsinstitut fur Experimentelle Geochemie und Geophysik, Universitat Bayreuth 173-176 2010

  71. 中国東北部長白山北東麓に分布するテフラ由来土壌の特性・生成・分類

    菅野均志, 宮本, 毅 長瀬敏郎

    東北アジア研究センター叢書 「白頭山火山とその周辺の地球科学」 41 159-185 2010

  72. 14C wiggle-matching of the B-Tm tephra, Baitoushan volcano, China/North Korea. Peer-reviewed

    Shinya Yatsuzuka, Mitsuru Okuno, Toshio Nakamura, Katsuhiko Kimura, Yohei Setoma, Tsuyoshi Miyamoto, Kyu Han Kim, Hiroshi Moriwaki, Toshiro Nagase, Xu Jin, Bo Lu Jin, Toshihiko Takahashi, Hiromitsu Taniguchi

    Radiocarbon 52 (3) 933-940 2010

    DOI: 10.1017/S0033822200046038  

    ISSN: 0033-8222

  73. Fractional crystallization of olivine melt inclusion in shock-induced chondritic melt vein Peer-reviewed

    M. Miyahara, A. El Goresy, E. Ohtani, M. Kimura, S. Ozawa, T. Nagase, M. Nishijima

    PHYSICS OF THE EARTH AND PLANETARY INTERIORS 177 (3-4) 116-121 2009/12

    DOI: 10.1016/j.pepi.2009.08.001  

    ISSN: 0031-9201

  74. Detailed FIB-TEM study of ringwoodite lamellae in individual olivine grains in shock-melt veins of Yamato 791384 L6 chondrite. Peer-reviewed

    M. Miyahara, E. Ohtani, M. Kimura, A. El Goresy, S. Ozawa, T. Nagase

    Meteoritics & Planetary Science 44 A145-A145 2009/07

    ISSN: 1086-9379

  75. Micro-surgical FIB-TEM study of diverse liquidus wadsleyite-ringwoodite pairs fractionally crystallized from olivine melt enclaves in shock melt veins in L6 chondrites. Peer-reviewed

    A. El Goresy, M. Miyahara, E. Ohtani, T. Nagase, M. Nishijima, T. Ferroir, Ph. Gillet

    Meteoritics & Planetary Science 44 A79-A79 2009/07

    ISSN: 1086-9379

  76. Computational simulations of the structure of Japan twin boundaries in quartz Peer-reviewed

    Koichi Momma, Toshiro Nagase, Yasuhiro Kudoh, Takahiro Kuribayashi

    EUROPEAN JOURNAL OF MINERALOGY 21 (2) 373-383 2009/03

    DOI: 10.1127/0935-1221/2009/0021-1893  

    ISSN: 0935-1221

    eISSN: 1617-4011

  77. A50 14C Wiggle-Matching of Wood Trunks from the Northeast Slope of Baitoushan Volcano

    Yatsuzuka S., Okuno M., Nakamura T., Kimura K., Sawada M., Setoma Y., Miyamoto K., Kim K. H., Moriwaki H., Nagase T., Jin X., Jin B. L., Takahashi T., Taniguchi H.

    PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN 2009 50-50 2009

    Publisher: The Volcanological Society of Japan

    DOI: 10.18940/vsj.2009.0_50  

  78. First natural occurrence of ringwoodite exsolution lamellae in fractionally crystallized Mg-rich wadsleyite from shock-induced olivine melts in L6 chondrites. Peer-reviewed

    El Goresy A, Miyahara M, Ohtani E, Ozawa S, Nagase T, Nishijima M

    Annual report of Bayerisches Forschungsinstitut fur Experimentelle Geochemie und Geophysik, Universitat Bayreuth 2009 158-162 2009

  79. Coherent ringwoodite growth in olivine of Yamato 791384 L6 chondrite. Peer-reviewed

    Miyahara M, Ohtani E, Kimura M, El Goresy A, Ozawa S, Nagase T, Nishijima M, Hiraga K

    Annual report of Bayerisches Forschungsinstitut fur Experimentelle Geochemie und Geophysik, Universitat Bayreuth 2009 158-162 2009

  80. Coherent and incoherent phase transformation from olivine to ringwoodite and the time scale for shock events on asteroids Peer-reviewed

    Miyahara, M, Ohtani, E, Kimura, M, El Goresy, A, Ozawa, S, Nagase, T, Nishijima, M, Hiraga, K

    American Geophysical Union, Fall Meeting 2009, abstract #MR13B-1674 2009

  81. Evidence for fractional crystallization of wadsleyite and ringwoodite from individual olivine melt pockets in chondrules entrained in shock melt veins Peer-reviewed

    A. El Goresy, M. Miyahara, E. Ohtani, T. Nagase, M. Nishijima, Z. Washaei, T. Ferroir, Ph. Gillet, L. Dubrovinsky, A. Simionovici

    METEORITICS & PLANETARY SCIENCE 43 (7) A41-A41 2008/07

    ISSN: 1086-9379

  82. Evidence for fractional crystallization of wadsleyite and ringwoodite from olivine melts in chondrules entrained in shock-melt veins Peer-reviewed

    Masaaki Miyahara, Ahmed El Goresy, Eiji Ohtani, Toshiro Nagase, Masahiko Nishijima, Zahra Vashaei, Tristan Ferroir, Philippe Gillet, Leonid Dubrovinsky, Alexandre Simionovici

    PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 105 (25) 8542-8547 2008/06

    DOI: 10.1073/pnas.0801518105  

    ISSN: 0027-8424

  83. Application of FIB system to ultra-high-pressure Earth science Peer-reviewed

    Masaaki Miyahara, Takeshi Sakai, Eiji Ohtani, Yusuke Kobayashi, Seiji Kamada, Tadashi Kondo, Toshiro Nagase, Jung Ho Yoo, Masahiko Nishijima, Zahra Vashaei

    JOURNAL OF MINERALOGICAL AND PETROLOGICAL SCIENCES 103 (2) 88-93 2008/04

    DOI: 10.2465/jmps.070612b  

    ISSN: 1345-6296

    eISSN: 1349-3825

  84. Growth textures and twin boundary structures of quartz twinned after Japan Law

    Momma Koichi, Nagase Toshiro, Kuribayashi Takahiro, Kudoh Yasuhiro

    Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences 2008 152-152 2008

    Publisher: Japan Association of Mineralogical Sciences

    DOI: 10.14824/jakoka.2008.0.152.0  

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    Growth textures and twin boundary structures of quartz twinned after Japan Law were studied by observations of etch figures and cathode luminescence, and molecular dynamics (MD) simulations. Near the composition plane of Japanese twin, hourglass-shaped sectors are observed to have mosaic textures composed of polysynthetic Brazil twin. This sector corresponds to a growth sector of {10-11} or {01-11}, where the composition plane is smooth and flat {11-22}.From the MD simulations, it is shown that {11-22} is the only composition plane that does not incorporate dislocations, and that dislocations are not required at a junction of Japanese and Brazil twin boundaries.These facts indicate that {11-22} composition plane of Japanese twin serve as a source of Brazil twin during the course of growth.

  85. Fractional crystallization of olivine melt inclusions in a shock-induced chondritic melt vein Peer-reviewed

    M. Miyahara, A. El Goresy, E. Ohtani, S. Ozawa, T. Nagase, M. Nishijima

    Annual report of Bayerisches Forschungsinstitut fur Experimentelle Geochemie und Geophysik, Universitat Bayreuth 2008 162-165 2008

  86. The effects of G-OH replacement on the compression of super hydrous phase B structure. Peer-reviewed

    Kuribayashi T, Nagase T, Kojitani H, Akaogi M, Hemley R, Mao H-k, Kudoh Y

    Acta Crystallographica A64 C90 2008

  87. The role of Japanese twin boundary in quartz as a source of Brazil twin Peer-reviewed

    Koichi Momma, Toshiro Nagase, Yasuhiro Kudoh, Takahiro Kuribayashi

    ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES 64 C591-C591 2008

    DOI: 10.1107/S0108767308081026  

    ISSN: 2053-2733

  88. The study of fine-grained interstice filling materials in chondrule and the fine-grained rim within Cold Bokkeveld chondrite by FIB-TEM/STEM Peer-reviewed

    M. Miyahara, S. Uehara, E. Ohtani, T. Nagase, R. Kitagawa

    METEORITICS & PLANETARY SCIENCE 42 A110-A110 2007/08

    ISSN: 1086-9379

  89. Fe-Mg partitioning between post-perovskite and magnesiowustite Peer-reviewed

    T. Kondo, T. Sakai, Y. Kobayashi, E. Ohtani, M. Masaaki, J. -H. Yoo, T. Nagase

    GEOCHIMICA ET COSMOCHIMICA ACTA 70 (18) A329-A329 2006/08

    DOI: 10.1016/j.gca.2006.06.664  

    ISSN: 0016-7037

  90. Appearance of basal faces in natural amethyst crystals from Four Peaks, Arizona Peer-reviewed

    M Kawasaki, T Nagase, K Onuma, T Katsumata, Sunagawa, I

    EUROPEAN JOURNAL OF MINERALOGY 18 (2) 273-278 2006/03

    DOI: 10.1127/0935-1221/2006/0018-0273  

    ISSN: 0935-1221

  91. A04 14C Wiggle-matching of a Charred Wood Trunk at the Northern Foot of Baitoushan Volcano, China/North Korea(THE VOLCANOLOGICAL SOCIETY OF JAPAN 2006 FALL MEETING)

    Yatsuzuka S., Okuno M., Nakamura T., Kimura K., Miyamoto T., Taniguchi H., Nagase T., Jin X., Takahashi T.

    PROGRAMME AND ABSTRACTS THE VOLCANOLOGICAL SOCIETY OF JAPAN 2006 4-4 2006

    Publisher: The Volcanological Society of Japan

    DOI: 10.18940/vsj.2006.0_4  

  92. Fe-Mg partitioning between (Mg, Fe)SiO3 post-perovskite, perovskite, and magnesiowustite in the Earth's lower mantle Peer-reviewed

    Y Kobayashi, T Kondo, E Ohtani, N Hirao, N Miyajima, T Yagi, T Nagase, T Kikegawa

    GEOPHYSICAL RESEARCH LETTERS 32 (19) L19301 2005/10

    DOI: 10.1029/2005GL023257  

    ISSN: 0094-8276

  93. Formation of metastable cubic-perovskite in high-pressure phase transformation of Ca(Mg, Fe, Al)Si2O6 Peer-reviewed

    Y Asahara, E Ohtani, T Kondo, T Kubo, N Miyajima, T Nagase, K Fujino, T Yagi, T Kikegawa

    AMERICAN MINERALOGIST 90 (2-3) 457-462 2005/02

    DOI: 10.2138/am.2005.1649  

    ISSN: 0003-004X

    eISSN: 1945-3027

  94. X-ray diffraction and FT-IR observation of Li-serandite

    fujishima daisuke, kuribayasi takahiro, nagase tosiro, hori hidemiti, kudoh yasuhiro

    Abstracts for Annual Meeting of the Mineralogical Society of Japan 2005 67-67 2005

    Publisher: Japan Association of Mineralogical Sciences

    DOI: 10.14824/kobutsu.2005.0.67.0  

  95. Origin of complicated internal growth texture in iridescent grandite garnet from Tenkawa, Nara, Japan

    Akizuku Mizuhiko, Itoh Yoshinori, Hori Hidemichi, Kuribayashi Takahiro, Nagase Toshiro

    Abstracts for Annual Meeting of the Mineralogical Society of Japan 2005 68-68 2005

    Publisher: Japan Association of Mineralogical Sciences

    DOI: 10.14824/kobutsu.2005.0.68.0  

  96. MD simulations on stacking fault of silica minerals

    Momma Koichi, Nagase Toshiro, Kudoh Yasuhiro, Kuribayashi Takahiro

    Abstracts for Annual Meeting of the Mineralogical Society of Japan 2005 61-61 2005

    Publisher: Japan Association of Mineralogical Sciences

    DOI: 10.14824/kobutsu.2005.0.61.0  

  97. Texture of pseudohexagonal crystal of moganite (lutecite)

    NAGASE Toshiro, MOMMA Koichi, TANAKA Masahiko

    Abstracts for Annual Meeting of the Mineralogical Society of Japan 2004 131-131 2004/09/22

    Publisher: Japan Association of Mineralogical Sciences

    DOI: 10.14824/kobutsu.2004.0.112.0  

    ISSN: 1348-6543

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    Texture of pseudohexagonal crystal of moganite (lutecite)

  98. Inventory of the Baitoushan outcrops

    T.Miyamoto, H. Kanno, T.Nagase

    CNEAS Monograph series (16) 167-210 2004/03

  99. Angle-resolved photoemission study of CoSi2 nanofilms grown on Si(111) substrates Peer-reviewed

    H Sasaki, A Tanaka, Y Kuriyama, Y Kuriyama, T Nagasawa, Y Takeda, S Suzuki, S Sato, T Nagase

    SOLID STATE COMMUNICATIONS 129 (2) 91-95 2004/01

    DOI: 10.1016/j.ssc.2003.09.023  

    ISSN: 0038-1098

  100. 白頭山露頭集

    宮本毅, 菅野均志, 長瀬敏郎

    東北アジア研究センター叢書 16 153-166 2004

  101. Mechanisms and kinetics of the post-garnet transformation in natural pyrope Peer-reviewed

    T Kubo, E Ohtani, T Hososya, T Kondo, T Kikegawa, T Nagase

    GEOCHIMICA ET COSMOCHIMICA ACTA 67 (18) A238-A238 2003/09

    ISSN: 0016-7037

  102. Ce anomalies in the 2.6-2.4 Ga Kalkkloof paleosol in South Africa: Evidence for the early development of an oxygenated atmosphere Peer-reviewed

    Y Watanabe, T Nagase, H Ohmoto

    GEOCHIMICA ET COSMOCHIMICA ACTA 67 (18) A528-A528 2003/09

    ISSN: 0016-7037

  103. Fluidization and melting of fault gouge during seismic slip: Identification in the Nojima fault zone and implications for focal earthquake mechanisms Peer-reviewed

    K Otsuki, N Monzawa, T Nagase

    JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH 108 (B4) 2192-2208 2003/04

    DOI: 10.1029/2001JB001711  

    ISSN: 2169-9313

    eISSN: 2169-9356

  104. 白頭山(長白山)の爆発的噴火史の再検討

    宮本 毅, 中川光弘, 大場 司, 長瀬敏郎, 菅野均志, 大場 司, 北村繁, 谷口宏充

    東北アジア研究 7 93-110 2003

    Publisher:

    ISSN: 1343-9332

  105. Metastable garnet in oceanic crust at the top of the lower mantle Peer-reviewed

    T Kubo, E Ohtani, T Kondo, T Kato, M Toma, T Hosoya, A Sano, T Kikegawa, T Nagase

    NATURE 420 (6917) 803-806 2002/12

    DOI: 10.1038/nature01281  

    ISSN: 0028-0836

  106. Interfacial energies for quartz and albite in pelitic schist Peer-reviewed

    T Hiraga, O Nishikawa, T Nagase, M Akizuki, DL Kohlstedt

    CONTRIBUTIONS TO MINERALOGY AND PETROLOGY 143 (6) 664-672 2002/09

    DOI: 10.1007/s00410-002-0375-4  

    ISSN: 0010-7999

  107. 白頭山10世紀巨大噴火の噴火時系列と火山伝承

    宮本毅, 中川光弘, 成澤勝, 大場司, 長瀬敏郎, 谷口宏充

    地球惑星科学関連合同大会予稿集 2002/05

  108. Texture and morphology of submicron-sized quartz crystals with moganite synthesized by hydrothermal experiment Peer-reviewed

    T. Nagase, M. Abiko, Y. Kudoh

    International Mineralogical Association general meeting, Abstract and Program 2002 115 2002

  109. Quantitative analyses of Brazil twin defects in chalcedony by X-ray powder diffraction method.

    T. Nagase, M. Abiko, M. Tanaka

    KEK Progress Report 2002

  110. 白頭山10世紀噴火の噴火推移

    宮本毅, 中川光弘, 大場司, 長瀬敏郎, 菅野均志, 谷口宏充

    月刊地球 号外39 202-209 2002

  111. Morphology of intergranular pores and wetting angles in pelitic schists studied by transmission electron microscopy Peer-reviewed

    T Hiraga, O Nishikawa, T Nagase, M Akizuki

    CONTRIBUTIONS TO MINERALOGY AND PETROLOGY 141 (5) 613-622 2001/08

    DOI: 10.1007/s004100100263  

    ISSN: 0010-7999

  112. 民族伝承中に残された白頭山10世紀噴火

    宮本毅, 成澤勝, 大場司, 長瀬敏郎, 谷口宏充

    地球惑星科学関連合同大会予稿集 2001/06

  113. Triclinic liddicoatite and elbaite in growth sectors of tourmaline from Madagascar Peer-reviewed

    M Akizuki, T Kuribayashi, T Nagase, A Kitakaze

    AMERICAN MINERALOGIST 86 (3) 364-369 2001/03

    ISSN: 0003-004X

  114. Microtexture and Microstructure of Minerals in Metastable Phase. Peer-reviewed

    Toshiro Nagase

    Journal of the Crystallographic Society of Japan 42 (2) 148-154 2000

    Publisher: The Crystallographic Society of Japan

    DOI: 10.5940/jcrsj.42.148  

    ISSN: 0369-4585

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    Metastable phase, which has a lager value of Gibbs free energy than that of the stable phase, commonly occurs in nature against the thermodynamic regulation. Microtexture and microstructure of some metastable-phase minerals (opal-CT, marcasite and wurtzite) are studied by high-resolution transmission electron microscopy. Disordered stacking structures are commonly observed in the metastable phases. In the case of the opal-CT (Hosaka and Akase opal mines, Japan) and marcasite (Ikezuki, Japan), highly ordered domains appear around the domains with disordered stacking structure. Chocaya-Animas wurtzite crystals overgrow on the domains of disordered stackings of sphalerite and wurtzite, which were formed from ordered sphalerite.

  115. Crystallographic information acquired from observation of crystal morphology Peer-reviewed

    Toshiro Nagase

    Journal of the Crystallographic Society of Japan 42 (6) 469-473 2000

    Publisher: The Crystallographic Society of Japan

    DOI: 10.5940/jcrsj.42.469  

    ISSN: 0369-4585

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    External form of polyhedral crystal provides information on the structural feature of the crystal. This article describes the relation between the external form and the structure of crystals.

  116. The structure of grain boundaries in granite-origin ultramylonite studied by high-resolution electron microscopy Peer-reviewed

    T Hiraga, T Nagase, M Akizuki

    PHYSICS AND CHEMISTRY OF MINERALS 26 (8) 617-623 1999/09

    DOI: 10.1007/s002690050226  

    ISSN: 0342-1791

  117. High resolution TEM observations of micro-texture in arsenopyrite. Peer-reviewed

    T. Nagase, T. Nishihori, A. Kitakaze, M. Akizuki

    Geological Society of America annual meeting, Abstract and Program 31 (7) A-170 1999

  118. Precipitation of metastable phases and kinetics of solution-mediated transformation. Peer-reviewed

    Shoji KOJIMA, Toshiro NAGASE

    Journal of Mineralogy, Petrology and Economic Geology 94 (3) 377-388 1999

    Publisher: Japan Association of Mineralogical Sciences

    DOI: 10.2465/ganko.94.377  

    ISSN: 0914-9783

    More details Close

    This study summarizes the principal factors on nucleation, growth and polymorphic transformation termed "solution-mediated phase transformation" of some thermodynamically metastable phases in nature. The formation of the metastable phases occurring occasionally in hydrothermal deposits and sedimentary rocks is explained by the empirical Ostwald step rule, where the surface free energy and degrees of supersaturation are important factors. Transformation from a metastable phase to a stable polymorph in a solution can be kinetically analyzed by the relative rates of dissolution and growth of the two phases.<br>     The solubility of opal-CT as an example of metastable phase is usually higher than that of quartz as the stable phase, but this relation reverses in the case of nm-size grains according to the mesoscopic effect. In the latter case both solubilities of opal-CT and quartz become distnctly higher, and so the polymorphic relation among the silica minerals in nature is inferred to be in accordance with the Ostwald step rule. In contrast to solid-state transformation, metastably crystallized wurtzite appears to transform readily into stable sphalerite under hydrothermal conditions. This suggests that the solution-mediated transformation can be rapidly attained as compared with the solid-state transformation, showing that the dissolution-precipitation mechanism is predominant in the low-temperature polymorphic transformations.

  119. フオーラム 第17回IMA総会トロント会議の報告

    末野 重穂, 長瀬 敏郎, 栗林 貴弘

    鉱物学雑誌 27 (4) 237-242 1998/11

    Publisher: 日本鉱物学会

    ISSN: 0454-1146

  120. 第17回国際鉱物学連合総会に参加して

    長瀬 敏郎

    鉱物学雜誌 = Journal of the Mineralogical Society of Japan 27 (4) 239-240 1998/11

    ISSN: 0454-1146

  121. Comment on "a new hydrous silicate, a water reservoir, in the upper part of the lower mantle" by Eiji Ohtani, Hiroki Mizobata, Yasuhiro Kudoh, Toshiro Nagase, Haruo Arashi, Hisayoshi Yurimoto, and Isoji Miyagi Peer-reviewed

    Lin Gun Liu, T. Irifune

    Geophysical Research Letters 25 (7) 979-982 1998/04/01

    DOI: 10.1029/98GL00474  

    ISSN: 0094-8276 1944-8007

  122. Reply [to "comment on 'A new hydrous silicate, a water reservoir, in the upper part of the lower mantle' by Eiji Ohtani, Hiroki Mizobata, Yasuhiro Kudoh, Toshiro Nagase, Haruo Arashi, Hisayoshi Yurimoto, and Isoji Miyagi"] Peer-reviewed

    Eiji Ohtani, Hiroki Mizobata, Yasuhiro Kudoh, Toshiro Nagase, Haruo Arashi, Hisayoshi Yurimoto, Isoji Miyagi

    Geophysical Research Letters 25 (7) 981-982 1998/04/01

    Publisher: Blackwell Publishing Ltd

    DOI: 10.1029/98GL00542  

    ISSN: 1944-8007 0094-8276

    eISSN: 1944-8007

  123. Cristobalite from Taihakusan, Sendai City Peer-reviewed

    Tugio OHYAMA, Yoshinori ITOH, Arashi KITAKAZE, Toshiro NAGASE, Mizuhiko AKIZUKI

    Journal of Mineralogy, Petrology and Economic Geology 93 (9) 344-346 1998

    DOI: 10.2465/ganko.93.344  

  124. TEM observations of the disordered domain in marcasite from Ikezuki, Japan and Potosi, Bolivia. Peer-reviewed

    T. Nagase, M. Akizuki

    International Mineralogical Association general meeting, Abstract and Program. A86 1998

  125. Crystal structure of chondrodite at 5.5 GPa.

    Y. Kudoh, T. Kuribayashi, T. Nagase, S. Sasaki, M. Tanaka

    KEK Progress Report 98 (3) 117 1998

  126. Possible Sites for Hydrogen in a New Hydrops Magnesium Silicate Phase G Synthesized at 22 GPa and 1050 °C Peer-reviewed

    Y. Kudoh, T. Nagase, H. Mizobata, E. Ohtani, S. Sasaki, M. Tanaka

    Review of High Pressure Science and Technology/Koatsuryoku No Kagaku To Gijutsu 7 134-136 1998

    DOI: 10.4131/jshpreview.7.134  

    ISSN: 1348-1940 0917-639X

  127. Texture and structure of opal-CT and opal-C in volcanic rocks Peer-reviewed

    T Nagase, M Akizuki

    CANADIAN MINERALOGIST 35 947-958 1997/08

    ISSN: 0008-4476

  128. Chrysoprase from Warrawanda, Western Australia Peer-reviewed

    T Nagase, M Akizuki, M Onoda, M Sato

    NEUES JAHRBUCH FUR MINERALOGIE-MONATSHEFTE 1997 (7) 289-300 1997/07

    ISSN: 0028-3649

  129. Structure and crystal chemistry of phase G, a new hydrous magnesium silicate synthesized at 22 GPa and 1050 degrees C Peer-reviewed

    Y Kudoh, T Nagase, H Mizohata, E Ohtani, S Sasaki, M Tanaka

    GEOPHYSICAL RESEARCH LETTERS 24 (9) 1051-1054 1997/05

    DOI: 10.1029/97GL00875  

    ISSN: 0094-8276

  130. A new hydrous silicate, a water reservoir, in the upper part of the lower mantle Peer-reviewed

    E Ohtani, H Mizobata, Y Kudoh, T Nagase, H Arashi, H Yurimoto, Miyagi, I

    GEOPHYSICAL RESEARCH LETTERS 24 (9) 1047-1050 1997/05

    DOI: 10.1029/97GL00874  

    ISSN: 0094-8276

  131. Possible sites for hydrogen in a new hydrous magnesium silicate phase G synthesized at 22 GPa and 1050℃ Peer-reviewed

    Kudoh, Y, T. Nagase, H. Mizobata, E. Ohtani, S. Sasaki, M. Tanaka

    Proceedimgs for AIRAPT16, Kyoto August 24-29 1997/04

  132. An SEM examination of the chalcopyrite disease texture and its genetic implications Peer-reviewed

    T Nagase, S Kojima

    MINERALOGICAL MAGAZINE 61 (1) 89-97 1997/02

    DOI: 10.1180/minmag.1997.061.404.09  

    ISSN: 0026-461X

  133. Crystal structure of phase G synthesized at 22 GPa and 1050℃.

    Y. Kudoh, T. Nagase, S. Sasaki, M. Kanzaki, M. Tanaka

    KEK Progress Report 97 (2) 190 1997

  134. High resolution electron microscope observations of natural wurtzite. Peer-reviewed

    T. Nagase, M. Akizuki, S. Kojima

    Geological Society of America annual meeting, Abstract and Program. 29 (6) A-400 1997

  135. On the accuracy of X-ray diffraction intensities of a small single crystal of hydrous magnesium silicate measured with a four-circle diffractometer using a diamond anvil high pressure cell. Peer-reviewed

    Y. Kudoh, T. Nagase, S. Sasaki, M. Kanzaki, M. Tanaka

    KEK Progress Report 96 (3) 148 1996

  136. PHASE-F, A NEW HYDROUS MAGNESIUM-SILICATE SYNTHESIZED AT 1000-DEGREES-C AND 17 GPA - CRYSTAL-STRUCTURE AND ESTIMATED BULK MODULUS (RETRACTED ARTICLE. SEE VOL 24, PG 601, 1997) Peer-reviewed

    Y KUDOH, T NAGASE, S SASAKI, M TANAKA

    PHYSICS AND CHEMISTRY OF MINERALS 22 (5) 295-299 1995/07

    DOI: 10.1007/BF00202769  

    ISSN: 0342-1791

    eISSN: 1432-2021

  137. A coprecipitation experiment on the chalcopyrite disease texture involving Fe-bearing sphalerite. Peer-reviewed

    S. Kojima, T. Nagase, T. Inoue

    Journal of Mineralogy, Petrology and Economic Geology 90 (8) 261-267 1995

    Publisher: Japan Association of Mineralogical Sciences

    DOI: 10.2465/ganko.90.261  

    ISSN: 0914-9783

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    含鉄閃亜鉛鉱を伴う黄銅鉱病変組織に関する同時沈殿実験.

  138. An orbicular rock from Shiroishi, Miyagi Prefecture Peer-reviewed

    Ioki SUZUKI, Mizuhiko AKIZUKI, Toshiro NAGASE, Hirokazu FUJIMAKI

    Journal of Mineralogy, Petrology and Economic Geology 90 (4) 124-131 1994/04

    DOI: 10.2465/ganko.90.124  

  139. Morphology and grain size of chalcopyrite in intimate associations of sphalerite-chalcopyrite. Peer-reviewed

    Shoji Kojima, Toshiro Nagase

    Resource Geology 44 (4) 249-256 1994

    Publisher:

    DOI: 10.11456/shigenchishitsu1992.44.249  

    ISSN: 0918-2454

  140. Crystal structure and compressibility of superhydrous phase B, Mg20Si6H8O36. Peer-reviewed

    Y. Kudoh, T. Nagase, S. Ohta, S. Sasaki, M. Kanzaki and M. Tanaka.

    High-pressure Science and Technology-1993, PTS 1 AND 2 469-472 1994

  141. Crystal structure and compressibility of superhydrousphase B, Mg20Si6H8O36 using a diamondanvil and single crystal X-ray diffraction method.

    Y. Kudoh, T. Nagase, S. Ohta, S. Sasaki, M. Kanzaki, M. Tanaka

    KEK Progress Report 94-1 199 1994

  142. Crystal Structure analysis of fluorite, CaF2 at 7GPa using a diamond anvil and single crystal X-ray diffraction method.

    Y. Kudoh, T. Nagase, S. Ohta, S. Sasaki, M. Kanzaki, M. Tanaka

    KEK Progress Report 1,214 1993

  143. Improvement of mechanical properties of thin film coated glass. Peer-reviewed

    H. Nakai, T. Nagase

    Science and Technology of New Glasses 1991

Show all ︎Show first 5

Misc. 43

  1. Reconsideration on the site preference of Cu/Zn in tetrahedrite using synchrotron AXS method

    原田敬太, 栗林貴弘, 山根崚, 長瀬敏郎, 杉山和正

    量子ビームサイエンスフェスタ(Web) 2023 2024

  2. Extra-framework sites of labuntsovite-Mn from Aris Quarries, Aris, Windhoek, Khomas, Namibia

    中村友梨江, 杉山和正, 長瀬敏郎

    日本鉱物科学会年会講演要旨(Web) 2019 2019

  3. Site occupancy analysis of cations in Fe2.69Ti0.31O4 by X-ray anomalous scattering

    奥部真樹, 鴛海太郎, 長瀬敏郎, 佐々木聡, 佐々木聡, 杉山和正

    量子ビームサイエンスフェスタ(Web) 2017 2018

  4. Determination of chirality of minerals with screw symmetry using X-ray anomalous scattering effects

    Oshiumi Taro, Okube Maki, Arima Hiroshi, Nagase Toshiro, Sugiyama Kazumasa

    Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences 2017 (0) 86-86 2017

    Publisher: Japan Association of Mineralogical Sciences

    DOI: 10.14824/jakoka.2017.0_86  

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    Quartz has two different types of crystal structures, either in P3121 or P3221 space group,which are enantiomorphic to each other. Since conventional X-ray structure analysis can't distinguish these two structures, we applied X-ray anomalous scattering method in our chirality detemination analysis. Levoratory and dextrorotary quartz crystals were proved as in P3121 and P3221 space group, respectively. In addition, we discuss chirality discriomination of Cyrilovite which has 4 fold screw axis.

  5. Physical sensor data and hydrothermal precipitate obtained from the Kuroko-ore cultivation apparatus retrieved by the KR16-17 Cruise; Long-term monitoring of the artificial hydrothermal vent and in-situ precipitation experiment

    Nozaki Tatsuo, Yokoyama Takahiro, Akiyama Keita, Sakurai Noriaki, Saruhashi Tomokazu, Kyo Masanori, Kumagai Hidenori, Maeda Lena, Takai Ken, Masaki Yuka, Nagase Toshiro, Torimoto Junji, Saito Masafumi, Takaya Yutaro, Ishibashi Jun-ichiro, Shimada Kazuhiko, Watanabe Masayuki

    Annual Meeting of the Geological Society of Japan 2017 (0) 2017

    Publisher: The Geological Society of Japan

    ISSN: 1348-3935

  6. Sulfide drilled core sample obtained from the artificial hydrothermal vent in the Iheya-North Knoll, Okinawa Trough; Simulation of the sub-seafloor sulfide mineralization

    Nozaki Tatsuo, Akiyama Keita, Sakurai Noriaki, Saruhashi Tomokazu, Kyo Masanori, Kumagai Hidenori, Maeda Lena, Takai Ken, Nagase Toshiro, Torimoto Junji, Takaya Yutaro, Ishibashi Jun-Ichiro, Shimada Kazuhiko, Watanabe Masayuki, Masaki Yuka, Yokoyama Takahiro

    Annual Meeting of the Geological Society of Japan 2016 (0) 2016

    Publisher: 一般社団法人 日本地質学会

    ISSN: 1348-3935

  7. 高圧含水鉱物の合成とそのキャラクタリゼーション

    井上徹, 柿澤翔, CAI Nao, 藤野清志, 栗林貴弘, 長瀬敏郎, GREAUX Steeve, 肥後祐司, 阪本直哉, 圦本尚義, 服部高典, 佐野亜沙美

    高圧討論会講演要旨集 56th 45 2015/10/27

    ISSN: 0917-6373

  8. 含水bridgmaniteの合成とキャラクタリゼーション

    INOUE TOORU, YABUKI TOMOMI, KAKIZAWA SHO, FUJINO KIYOSHI, YURIMOTO HISAYOSHI, KURIBAYASHI TAKAHIRO, NAGASE TOSHIRO

    高圧討論会講演要旨集 55th 10 2014/11/10

    ISSN: 0917-6373

  9. AlとHに富むMg‐bridgmaniteの合成とキャラクタリゼーション

    INOUE TOORU, YABUKI TOMOMI, KAKIZAWA SHO, FUJINO KIYOSHI, YURIMOTO HISAYOSHI, KURIBAYASHI TAKAHIRO, NAGASE TOSHIRO

    日本鉱物科学会年会講演要旨集 2014 114 2014/09/10

    ISSN: 1348-6543

  10. A1-17 Radiocarbon Wiggle-matching dating for the Heian eruption from Towada volcano

    MIYAMOTO Tsuyoshi, HIROI Yoshimi, KANNO Hitoshi, NAGASE Toshiro, TANIGUCHI Hiromitsu

    Programme and abstracts the Volcanological Society of Japan 2013 17-17 2013/09/29

    Publisher: Volcanological Society of Japan

  11. FE-SEM observation for nano-sized textures in chalcedony and agate

    NAGASE Toshiro, MOMMA Koichi, KURIBAYASHI Takahiro, YAMADA Ryo-ichi

    2013 53-53 2013/09/05

    ISSN: 1348-6543

  12. Internal texture of feldspar and quartz from granitic pegmatites

    SEGAWA Yuka, KURIBAYASHI Takahiro, NAGASE Toshiro

    2013 73-73 2013/09/05

    ISSN: 1348-6543

  13. An attempt at crystal orientation analysis on dendritic intergrowth texture of sphalerite and chalcopyrite by EBSD method

    TAKAHASHI Daichi, NAGASE Toshiro, KURIBAYASHI Takahiro, YAMADA Ryoichi

    2013 113-113 2013/09/05

    ISSN: 1348-6543

  14. Chibaite from north Fossa Magna area, central Japan

    MOMMA Koichi, MIYAJIMA Hiroshi, SHIMOBAYASHI Norimasa, ISHIBASHI Takashi, TAKAYAMA Nobuyuki, NAGASE Toshiro, MIYAWAKI Ritsuro, MATSUBARA Satoshi

    Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences 2013 (0) 61-61 2013/09/05

    Publisher: Japan Association of Mineralogical Sciences

    DOI: 10.14824/jakoka.2013.0_61  

    ISSN: 1348-6543

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    Chibaite is a new silica clathrate mineral that was first discovered in Chiba Prefecture, Japan. We recently discovered the world's second occurrence of chibaite in north Fossa Magna area, central Japan. Chibaite was found in quartz and calcite vains in hyaloclastite of Late Miocene or Pliocene. The host rock is clinopyroxene-orthopyroxene-andesite containing xenolithic carbonaceous sandstone. The crystal structure of chibaite could be refined from single crystal X-ray diffraction data in a space group Fd-3m, and no evidence of symmetry lowering was detected. Hydrocarbon gas molecules such as methane, ethane were detected by Raman spectroscopy.

  15. Crystal structures of polytypes of shimazakiite

    MOMMA Koichi, KUSACHI Isao, KOBAYASHI Shoichi, TAKECHI Yasushi, NAKAMUTA Yoshihiro, NAGASE Toshiro, YOKOYAMA Kazumi, MIYAWAKI Ritsuro, SHIGEOKA Masako, MATSUBARA Satoshi

    2012 110-110 2012/09/15

    ISSN: 1348-6543

  16. CL image analysis for growth history of quartz crystal

    NAGASE Toshiro, KURIBAYASHI Takahiro, YAMADA Ryoichi, MOMMA Koichi

    2012 88-88 2012/09/15

    ISSN: 1348-6543

  17. Crystal structure refinements of δ-AlOOH around 10GPa using single crystal X-ray diffraction method

    KURIBAYASHI Takahiro, SANO Asami, NAGASE Toshiro

    2012 81-81 2012/09/15

    ISSN: 1348-6543

  18. Mineralogical characteristics of low symmetrized garnet from Mali

    NAKAMURA Yurie, KURIBAYASHI Takahiro, NAGASE Toshiro

    2012 94-94 2012/09/15

    ISSN: 1348-6543

  19. ユレイライトに含まれるダイアモンドとその起源

    宮原正明, 大谷栄治, EL GORESY Ahmed, LIN Yang-Ting, FENG Lu, ZHANG Jian-Chao, 長瀬敏郎, GILLET Philippe, 西嶋雅彦

    高圧討論会講演要旨集 53rd 2012

    ISSN: 0917-6373

  20. 火星隕石で発見されたオリビンのペロブスカイトとマグネシオブスタイトへの分解

    宮原正明, 大谷栄治, 小澤信, 木村眞, EL GORESY Ahmed, 境毅, 長瀬敏郎, 平賀賢二, 平尾直久, 大石泰生

    高圧討論会講演要旨集 52nd 29 2011/10/25

    ISSN: 0917-6373

  21. Observation of the pressure induced structural transition of d-AlOOH with single-crystal X-ray diffraction method

    KURIBAYASHI Takahiro, SANO Asami, NAGASE Toshiro

    2011 207-207 2011/09/05

    ISSN: 1348-6543

  22. TEM observations of textural change between quartz facet crystal and chalcedony

    NAGASE Toshiro, KURIBAYASHI Takahiro

    2011 133-133 2011/09/05

    ISSN: 1348-6543

  23. Shimazakiite, Ca_2B_<2-x>O_<5-3x>(OH)_<3x> (x = 0-0.06), a new mineral from Fuka, Okayama Prefecture, Japan

    KUSACHI Isao, KOBAYASHI Shoichi, TAKECHI Yasushi, NAKAMUTA Yoshihiro, NAGASE Toshiro, YOKOYAMA Kazumi, MIYAWAKI Ritsuro, SHIGEOKA Masako, MATSUBARA Satoshi

    2011 145-145 2011/09/05

    ISSN: 1348-6543

  24. Internal texture of quartz pseudomorphs after chibaite

    MOMMA Koichi, NAGASE Toshiro, KURIBAYASHI Takahiro, SHIGEOKA Masako

    2011 146-146 2011/09/05

    ISSN: 1348-6543

  25. 火星隕石より発見されたオリビンの高圧分解組織

    宮原正明, 大谷栄治, 小澤信, 木村眞, GORESY Ahmed El, 境毅, 長瀬敏郎, 平賀賢二, 平尾直久, 大石泰生

    日本鉱物科学会年会講演要旨集 2011 262-262 2011/09/05

    Publisher: Japan Association of Mineralogical Sciences

    DOI: 10.14824/jakoka.2011.0.257.0  

    ISSN: 1348-6543

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    We scanned olivine grains in a Martian meteorite to clarify the dissociation mechanism of olivine at high-pressure and -temperature condition induced by a dynamic event on the Mars. TEM observations reveal that micro-texture of olivine dissociation evolves from lamellar to equigranular with increasing temperature at same pressure condition, agreeing with the observations of synthetic samples recovered from high-pressure and -temperature experiments.

  26. 月隕石のα‐PbO2型シリカ及びスティショバイトのTEM観察

    宮原正明, 金子詳平, 大谷栄治, 境毅, 長瀬敏郎, 平尾直久

    日本鉱物科学会年会講演要旨集 2011 222-222 2011/09/05

    Publisher: Japan Association of Mineralogical Sciences

    DOI: 10.14824/jakoka.2011.0.218.0  

    ISSN: 1348-6543

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    Seifertite and stishovite in a shocked lunar meteorite were investigated by a FIB-TEM technique. Major original silica phase in the lunar meteorite is cristobalite with a twin texture. A cristobalite grain with a tweed texture contains rhomboid or spindle-shaped seifertite crystals. Many stishovite platelets are formed in a cristobalite with a lamellar texture. There is a specific crystallographic relationship between cristobalite and stishovite. Seifertite and stishovite would be formed by incoherently and coherent mechanism, respectively. Considering thermal gradient in the silica grains, a clapeyron slope between stishovite and seifertite is negative.

  27. Ureilite and carbon materials from asteroid 2008 TC3

    Miyahara Masaaki, Ohtani Eiji, El Goresy Ahmed, Nagase Toshiro, Nishijima Masahiko

    Annual Meeting of the Geological Society of Japan 2011 (0) 4-4 2011

    Publisher: 一般社団法人 日本地質学会

    ISSN: 1348-3935

  28. Fractional crystallization of wadsleyite and ringwoodite from olivine melt in shocked meteorites

    MIYAHARA Masaaki, OHTANI Eiji, EL GORESY Ahmed, KIMURA Makoto, OZAWA Shin, NAGASE Toshiro, NISHIJIMA Masahiko, HIRAGA Kenji, TRISTAN Ferroir, PHILIPPE Gillet, LEONID Dubrovinsky, ALEXANDER Simionovici

    高圧討論会講演集 51 35-35 2010/10/11

    ISSN: 0917-6373

  29. Textures of pyrite precipitated from low temperature solution

    NAGASE Toshiro, YAMADA Ryoichi, KAKEGAWA Takeshi

    2010 123-123 2010/09/23

    ISSN: 1348-6543

  30. 13-5 中国東北部長白山10世紀テフラ由来土壌に含まれる一次鉱物の風化状況(13.土壌生成・分類,2008年度愛知大会)

    菅野 均志, 長瀬 敏郎, 宮本 毅, 南條 正巳

    日本土壌肥料学会講演要旨集 (54) 114-114 2008/09/09

    Publisher: 一般社団法人日本土壌肥料学会

    ISSN: 0288-5840

  31. Further evidence for ubiquitous fractional crystallization of wadsleyite and ringwoodite from olivine melt

    M. Miyahara, M. Kimura, E. Ohtani, A. El Goresy, S. Ozawa, T. Nagase, M. Nishijima

    METEORITICS & PLANETARY SCIENCE 43 (7) A102-A102 2008/07

    ISSN: 1086-9379

  32. Fluctuation of aluminum and moganite content in agate texture

    MOMMA Koichi, NAGASE Toshiro, KUDOH Yasuhiro, KURIBAYASHI Takahiro

    2007 124-124 2007/09/22

    ISSN: 1348-6543

  33. Fe-Mg partitioning between post-perovskite and magnesiowustite

    T. Sakai, T. Kondo, Y. Kobayashi, E. Ohtani, M. Masaaki, J. -H. Yoo, T. Nagase

    GEOCHIMICA ET COSMOCHIMICA ACTA 70 (18) A552-A552 2006/08

    DOI: 10.1016/j.gca.2006.06.1575  

    ISSN: 0016-7037

  34. Appearance of Basal Faces in Natural Quartz Crystals

    SUNAGAWA Ichiro, NAGASE Toshiro, ONUMA Kazuo, KATSUMATA Tooru, KAWASAKI Masayuki

    Journal of the Japanese Association of Crystal Growth 32 (3) 156-156 2005/08/17

    Publisher: The Japanese Association for Crystal Growth (JACG)

    ISSN: 0385-6275

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    The surface microtopography of rough basal faces and internal inhomogeneities of amethyst crystals from Four Peaks, Arizona were investigated by means of optical, scanning electron microscopes and cathodoluminescence tomography. Rough interface overgrowth was shown to have taken place along the c-axis on mechanically broken surfaces and the present rough basal surfaces were demonstrated to have formed because of later heavy dissolution.

  35. Significance of meta-stable sulfide minerals in organic carbon-rich sedimentary rocks of the 2.77 Ga Mt. Roe Basalt in Western Australia

    Niitsuma S, Kakegawa T, Nagase T, Nedachi M

    Annual Meeting of the Geological Society of Japan 2005 (0) 59-59 2005

    Publisher: The Geological Society of Japan

    DOI: 10.14863/geosocabst.2005.0_59_1  

    ISSN: 1348-3935

  36. 核マントル境界条件下におけるFe‐MgSiO3反応

    境毅, 近藤忠, 大谷栄治, 長瀬敏郎

    高圧討論会講演要旨集 45th 138 2004/09/30

    ISSN: 0917-6373

  37. Unknown calcium borate mineral from the Fuka mine, Okayama Prefecture

    KUSACHI Isao, KOBAYASHI Syoichi, TAKECHI Yasushi, NAKAMUTA Yoshihiro, NAGASE Toshiro

    2004 136-136 2004/09/22

    ISSN: 1348-6543

  38. Li-Mn Pectolite Type Mineral from Tanohata Mine, Iwate, Japan

    HORI Hidemichi, NAGASE Toshiro, KITAMINE Mizuya

    2004 132-132 2004/09/22

    ISSN: 1348-6543

  39. Crystallographic features of microcrystalline quartz crystallized from low temperature hydrothermal solution

    MOMMA Koichi, NAGASE Toshiro, KUDOH Yasuhiro, KURIBAYASHI Takahiro, TANAKA Masahiko

    2004 75-75 2004/09/22

    ISSN: 1348-6543

  40. B22 三次元周期構造を有するスメクタイト

    中沢 弘基, 長瀬 敏郎, 山田 裕久

    粘土科学討論会講演要旨集 (47) 132-133 2003/09/24

    Publisher: 日本粘土学会

  41. On the original depth, melting of fault gouge, and temperature due to frictional heating for the pseudotachylyte of Nojima fault.

    OTSUKI Kenshiro, NAGASE Toshiro, MONZAWA Nobuaki

    1999 (2) A36 1999/11/09

  42. Phase F, a new hydrous magnesium silicate synthesized at 1000 degrees C and 17 GPa: Crystal structure and estimated bulk modulus (Retraction of vol 22, pg 295, 1995)

    Y Kudoh, T Nagase, S Sasaki, M Tanaka, M Kanzaki

    PHYSICS AND CHEMISTRY OF MINERALS 24 (8) 601-601 1997/10

    ISSN: 0342-1791

  43. Electron microscopic investigations of the chalcopyrite disease texture(2). -TEM observations of natural samples

    NAGASE T., KOJIMA S.

    45 (4) 282-282 1995/08/31

    ISSN: 0918-2454

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Books and Other Publications 6

  1. 鉱物・宝石の科学事典

    日本鉱物科学会, 宝石学会

    朝倉書店 2019/06

  2. 日本の国石「ひすい」ーバラエティに富んだ鉱物の国ー

    土山 明, 一般社団法人, 本鉱

    成山堂書店 2019/03

  3. 地形の辞典

    日本地形学連合編集

    朝倉書店 2017/02/10

    ISBN: 9784254160635

  4. 科学技術週間理解増進資料「一家に1枚鉱物-地球と宇宙の宝物」

    奥山 康子, 宮嶋敏, 鮎沢潤, 赤井純治, 川手新一, 貴治康夫, 黒澤正紀, 田中陵二, 土山明, 長瀬敏郎, 宮島宏, 宮脇律郎, 山田隆

    文部科学省 2013/04/15

    More details Close

    文科省学術・科学技術政策局基盤政策課が所掌する「科学技術週間」にて、一般(特に中学・高校生)の科学に対する関心と理解を向上させるために、毎年テーマを公募の上、大判ポスター約20万枚を製作・配布している。H25年度ポスター企画に所属学会を通じて応募し、上記タイトルにて企画の採択をみた。「鉱物」の美しさ、科学の上での重要性、鉱物科学のフロンティア・トピックスをグラフィックに紹介するとともに、部門の所掌時である資源と鉱物の結びつき、素材と鉱物の結びつきをも解説する内容。本件は、ポスター内容の解説と補足説明で、文科省科学技術週間WEBサイトにて電子公表される。補足説明内容は、ポスターに掲載した個々の鉱物の説明と、地球内部構造の解説。

  5. ものがたり 東北大学の至宝

    長瀬 敏郎

    東北大学出版会 2009

  6. 東北大学の至宝—資料が語る1世紀—東北大学創立100周年記念展示

    永田ほか

    東北大学 2007/09/01

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Presentations 66

  1. 沖縄トラフ熱水鉱床に産するisocubaniteの磁気特性

    加藤 千恵, 大野 正夫, 桑原 義博, 畠山 唯達, 山田 康洋, 戸塚 修平, 島田 和彦, 石橋 純一郎, 長瀬敏郎

    鉱物科学会年会

  2. 異極鉱高圧相における超周期構造のその場観察

    岡本 啓太郎, 栗林 貴弘, 長瀬 敏郎

    鉱物科学会年会 2019/09

  3. HAKUREIサイトの磁硫鉄鉱仮像組織の解析

    長瀬 敏郎, 野崎 達生, 高谷 雄太郎, 石橋純一郎, 熊谷 英憲, 前田 玲奈

    鉱物科学会年会 2019/09/22

  4. クトナホラ石の形態変化の結晶学的解析

    栗田 充喜, 長瀬 敏郎, 栗林 貴弘, 今井 裕之

    鉱物科学会年会 2019/09

  5. 単結晶X線回折実験によるアウインの結晶構造解析

    莅戸 俊一郎, 栗林 貴弘, 長瀬 敏郎

    鉱物科学会年会 2019/09

  6. ナミビア産ラブンツォフ石の細孔内におけるイオン分布

    中村 友梨江, 杉山 和正, 長瀬 敏郎

    鉱物科学会年会 2019/09

  7. 沖縄トラフごんどうサイトの海底下の熱水変質鉱物の鉱物学的・地球化学的特徴

    石橋 純一郎, 戸塚 修平, 堤 映日, 塚本 成, 吉良 優佑, 島田 和彦, 山崎 徹, 池原 研, 長瀬 敏郎, 高谷 雄太郎, 池端 慶, 後藤 隆嗣, 郷津 知太郎, 新城 竜一, 町山 栄章, 飯島 耕一, 山本 浩文, 熊谷 英憲

    日本地球惑星科学連合2019年大会

  8. CL法を用いた水晶の晶癖に対する重力効果の検討

    吉見 桃子, 長瀬 敏郎, 栗林 貴弘, 今井 裕之, 岡田敏朗

    鉱物科学会年会 2019

  9. Formation Processes of Trapiche Patterns

    Kawasaki Masayuki, Nagase Toshiro

    Abstract of Papers Presented at Annual Meeting of the Gemmological Society of Japan 2018

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    <p>Trapiche patterns were formed through the successive uptake of foreign minerals which nucleated at the ridges and the unidirectional growth by the instability of boundary interfaces</p>

  10. 異常分散法を用いたチタノマグネタイトの陽イオン価数分布解析

    奥部真樹, 鴛海太郎, 長瀬敏郎, 佐々木聡, 杉山和正

    鉱物科学会2017年会 2017/11/23

  11. サハリン南部におけるシリカクラスレート鉱物の産状

    門馬綱一, 谷健一郎, 宮脇律郎, 長瀬敏郎

    鉱物科学会2017年会 2017/09/12

  12. トラピッチェ・パターンの形成過程(その2)

    川崎雅之, 長瀬敏郎

    鉱物科学会2017年会 2017/09/12

  13. 茨城県日立鉱山産tetradymite様未知鉱物の結晶構造

    栗林貴弘, 長瀬敏郎, 野崎達生, 石橋純一郎, 島田和彦, 門馬綱一

    鉱物科学会2017年会 2017/09/12

  14. 奈良県天川村産レインボーガーネットにみられるラメラ組織の特徴

    中村友梨江, 長瀬敏郎, 栗林貴弘, 今井裕之

    鉱物科学会2017年会 2017/09/12

  15. X線異常分散法による、らせん対称性をもつ鉱物のキラリティの決定

    鴛海太郎, 奥部真樹, 有馬 寛, 長瀬敏郎, 杉山和正

    鉱物科学会2017年会 2017/09/12

  16. マダガスカル産低対称化電気石の鉱物学的特徴

    吉見桃子, 栗林貴弘, 長瀬敏郎

    鉱物科学会2017年会 2017/09/12

  17. 4 GPa付近におけるローソン石の高圧相転移

    岡本啓太郎, 栗林貴弘, 長瀬敏郎

    鉱物科学会2017年会 2017/09/12

  18. 瑪瑙組織のラマン分光解析

    長瀬敏郎, 栗林貴弘, 門馬綱一

    鉱物科学会2017年会 2017/09/12

  19. Physical sensor data and hydrothermal precipitate obtained from the Kuroko-ore cultivation apparatus retrieved by the KR16-17 Cruise; Long-term monitoring of the artificial hydrothermal vent and in-situ precipitation experiment

    Nozaki Tatsuo, Yokoyama Takahiro, Akiyama Keita, Sakurai Noriaki, Saruhashi Tomokazu, Kyo Masanori, Kumagai Hidenori, Maeda Lena, Takai Ken, Masaki Yuka, Nagase Toshiro, Torimoto Junji, Saito Masafumi, Takaya Yutaro, Ishibashi Jun-ichiro, Shimada Kazuhiko, Watanabe Masayuki

    Annual Meeting of the Geological Society of Japan 2017

  20. 櫻井鉱の単結晶 X 線構造解析

    日本結晶学会平成28年度年会 2016/11/17

  21. 奈良県天川村産イリデッセンスガーネットの結晶構造における陽イオン秩序配列

    鉱物科学会2016年会 2016/09/23

  22. アウインの高温その場回折実験:変調構造の原因に関する考察

    鉱物科学会2016年会 2016/09/23

  23. X型日本式双晶に見る接合面ごとの成長速度異方性

    鉱物科学会2016年会 2016/09/23

  24. 大分県尾平鉱山産水晶にみられる櫻構造について

    鉱物科学会2016年会 2016/09/23

  25. ウルツ鉱の組織と形成過程

    鉱物科学会2016年会 2016/09/23

  26. 黒鉱鉱石組織のEBSD解析

    長瀬 敏郎, 山田, 亮一, 野崎, 達生, 石橋, 純一郎, 栗林 貴弘

    資源地質学2016年度年会学術講演会 2016/06/24

  27. Volatile Cycles in the Deep Earth - from Subduction Zones to the Mantle and Core

    地球惑星科学関連連合大会 2016/05/22

  28. (Al, H)-bridgmaniteおよびAl-rich phase Dの精密構造解析

    第3回愛媛大学先進超高圧科学研究拠点シンポジウム 2016/02/23

  29. Kinetic roughening of tapered quartz and formation of trapiche quartz from Goyomatsu mine, Nara prefecture

    Kawasaki Masayuki, Kato Mutsumi, Hiroi Mikuni, Miyawaki Ritsuro, Kagi Hiroyuki, Imai Hiroyuki, Nagase Toshiro

    Journal of The Gemmological Society of Japan 2016

  30. Sulfide drilled core sample obtained from the artificial hydrothermal vent in the Iheya-North Knoll, Okinawa Trough; Simulation of the sub-seafloor sulfide mineralization

    Nozaki Tatsuo, Akiyama Keita, Sakurai Noriaki, Saruhashi Tomokazu, Kyo Masanori, Kumagai Hidenori, Maeda Lena, Takai Ken, Nagase Toshiro, Torimoto Junji, Takaya Yutaro, Ishibashi Jun-Ichiro, Shimada Kazuhiko, Watanabe Masayuki, Masaki Yuka, Yokoyama Takahiro

    Annual Meeting of the Geological Society of Japan 2016

  31. Kuroko cultivation project using an artificial hydrothermal vent in the Iheya-North Knoll, Okinawa Trough

    Nozaki Tatsuo, Yamada Ryoichi, Saruhashi Tomokazu, Kyo Masanori, Takai Ken, Ishibashi Jun-Ichiro, Shimada Kazuhiko, Nagase Toshiro, Takaya Yutaro, Kato Yasuhiro, Kawagucci Shinsuke, Watsuji Tomoo, Shibuya Takazo

    Abstracts of Annual Meeting of the Geochemical Society of Japan 2015

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    2010年9~10月に伊平屋北海丘で行われたIODP Exp. 331において,複数の人工熱水孔が形成された.その後,掘削孔の経過観察を目的とした潜航調査が複数回実施され,Hole C0016Aでは25ヶ月で高さ15 mにチムニーが急成長しており,熱水・生物・チムニーが採取されている.本研究では,これらのチムニーの記載・化学分析を行い,その生成機構や地球化学的特徴を明らかにする.また,JAMSTECで遂行中である人工熱水孔を利用した黒鉱養殖プロジェクトについても紹介する.

  32. Kinetic roughening of tapered quartz and formation of trapiche quartz from Goyomatsu mine, Nara Prefecture

    Kawasaki Masayuki, Kato Mutsumi, Hiroi Mikuni, Miyawaki Ritsuro, Kagi Hiroyuki, Imai Hiroyuki, Nagase Toshiro

    Abstract of Papers Presented at Annual Meeting of the Gemmological Society of Japan 2015

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    Natural tapered quartz crystals from Goyomatsu mine (Nara Prefecture) were observed by CL method. Their images show that the growth history was as follows, facet growth, cellular growth and adhesive-type growth, which were related to that of trapiche quartz.

  33. Kuroko cultivation project using an artificial hydrothermal vent in the Iheya-North Knoll, Okinawa Trough

    Nozaki Tatsuo, Yamada Ryoichi, Saruhashi Tomokazu, Kyo Masanori, Takai Ken, Ishibashi Jun-Ichiro, Shimada Kazuhiko, Nagase Toshiro, Takaya Yutaro, Kato Yasuhiro, Kagucci Shinsuke, Watsuji Tomoo, Shibuya Takazo

    Annual Meeting of the Geological Society of Japan 2015

  34. Traces of the natural gas clathrate minerals found in Myogajima Island, Kushimoto, the southern tip of the Kii Peninsula, Japan. The quartz pseudomorph after melanophlogite

    Ishibashi Takashi, Nagase Toshiro, Monma Koichi, Shimobayashi Norimasa, Fukui Seiko, Ohara Masaaki

    Annual Meeting of the Geological Society of Japan 2015

  35. An attempt at crystal orientation analysis on dendritic intergrowth texture of sphalerite and chalcopyrite by EBSD method

    TAKAHASHI Daichi, NAGASE Toshiro, KURIBAYASHI Takahiro, YAMADA Ryoichi

    日本鉱物科学会年会講演要旨集 2013/09/05

  36. Internal texture of feldspar and quartz from granitic pegmatites

    SEGAWA Yuka, KURIBAYASHI Takahiro, NAGASE Toshiro

    日本鉱物科学会年会講演要旨集 2013/09/05

  37. Chibaite from north Fossa Magna area, central Japan

    MOMMA Koichi, MIYAJIMA Hiroshi, SHIMOBAYASHI Norimasa, ISHIBASHI Takashi, TAKAYAMA Nobuyuki, NAGASE Toshiro, MIYAWAKI Ritsuro, MATSUBARA Satoshi

    日本鉱物科学会年会講演要旨集 2013/09/05

  38. FE-SEM observation for nano-sized textures in chalcedony and agate

    NAGASE Toshiro, MOMMA Koichi, KURIBAYASHI Takahiro, YAMADA Ryo-ichi

    日本鉱物科学会年会講演要旨集 2013/09/05

  39. Crystal structures of polytypes of shimazakiite

    MOMMA Koichi, KUSACHI Isao, KOBAYASHI Shoichi, TAKECHI Yasushi, NAKAMUTA Yoshihiro, NAGASE Toshiro, YOKOYAMA Kazumi, MIYAWAKI Ritsuro, SHIGEOKA Masako, MATSUBARA Satoshi

    日本鉱物科学会年会講演要旨集 2012/09/15

  40. CL image analysis for growth history of quartz crystal

    NAGASE Toshiro, KURIBAYASHI Takahiro, YAMADA Ryoichi, MOMMA Koichi

    日本鉱物科学会年会講演要旨集 2012/09/15

  41. Internal texture of quartz pseudomorphs after chibaite

    MOMMA Koichi, NAGASE Toshiro, KURIBAYASHI Takahiro, SHIGEOKA Masako

    日本鉱物科学会年会講演要旨集 2011/09/05

  42. Shimazakiite, Ca_2B_<2-x>O_<5-3x>(OH)_<3x> (x = 0-0.06), a new mineral from Fuka, Okayama Prefecture, Japan

    KUSACHI Isao, KOBAYASHI Shoichi, TAKECHI Yasushi, NAKAMUTA Yoshihiro, NAGASE Toshiro, YOKOYAMA Kazumi, MIYAWAKI Ritsuro, SHIGEOKA Masako, MATSUBARA Satoshi

    日本鉱物科学会年会講演要旨集 2011/09/05

  43. 衝撃を受けた隕石でのOlivineメルトからのWadsleyiteとRingwooditeの分別結晶作用

    宮原正明, 大谷栄治, Ahmed EL Goresy, 木村眞, 小澤信, 長瀬敏郎, 西嶋雅彦, 平賀賢二, Tristan Ferroir,Fhilippe Gillet,Leonid Dubrovinsky,Alexandre Simionovici

    第51回高圧討論会 2010/10/20

  44. 低温熱水から晶出した黄鉄鉱の内部組織観察

    山田亮一, 掛川武

    日本鉱物科学会 2010/09/23

  45. 黒鉱類似鉱床あるいは黒鉱の末端現象に関る諸問題

    山田亮一, 長瀬敏郎, 長谷川樹

    日本地質学会 2010/09/18

  46. Coherent and subsequent incoherent phase transformation from olivine to ringwoodite in a shocked L6 ordinary chondrite. International-presentation

    Miyahara M, Ohtani E, Kimura M, El Goresy A, Ozawa S, Nagase T, Nishijima M, Hiraga K

    G-COE Symposium 2010: Dynamic Earth and Heterogeneous Structure 2010/07/13

  47. EM observations of natural enstatite-majorite phase transition in a shocked meteorite: Implication for interior dynamics of planets. International-presentation

    Ozawa S, Miyahara M, Ohtani E, Kimura M, Nagase T

    G-COE Symposium 2010: Dynamic Earth and Heterogeneous Structure 2010/07/13

  48. A50 ^<14>C Wiggle-Matching of Wood Trunks from the Northeast Slope of Baitoushan Volcano

    Yatsuzuka S, Okuno M, Nakamura T, Kimura K, Sawada M, Setoma Y, Miyamoto K, Kim K. H, Moriwaki H, Nagase T, Jin X, Jin B. L, Takahashi T, Taniguchi H

    Programme and abstracts the Volcanological Society of Japan 2009/10/10

  49. 13-5 中国東北部長白山10世紀テフラ由来土壌に含まれる一次鉱物の風化状況(13.土壌生成・分類,2008年度愛知大会)

    菅野 均志, 長瀬 敏郎, 宮本 毅, 南條 正巳

    日本土壌肥料学会講演要旨集 2008/09/09

  50. Fluctuation of aluminum and moganite content in agate texture

    MOMMA Koichi, NAGASE Toshiro, KUDOH Yasuhiro, KURIBAYASHI Takahiro

    日本鉱物学会・学術講演会,日本岩石鉱物鉱床学会学術講演会講演要旨集 2007/09/22

  51. A04 ^<14>C Wiggle-matching of a Charred Wood Trunk at the Northern Foot of Baitoushan Volcano, China/North Korea(THE VOLCANOLOGICAL SOCIETY OF JAPAN 2006 FALL MEETING)

    Yatsuzuka S, Okuno M, Nakamura T, Kimura K, Miyamoto T, Taniguchi H, Nagase T, Jin X, Takahashi T

    Programme and abstracts the Volcanological Society of Japan 2006/10/23

  52. Significance of meta-stable sulfide minerals in organic carbon-rich sedimentary rocks of the 2.77 Ga Mt. Roe Basalt in Western Australia

    Niitsuma S, Kakegawa T, Nagase T, Nedachi M

    日本地質学会学術大会講演要旨 2005/09/10

  53. Texture of pseudohexagonal crystal of moganite (lutecite)

    NAGASE Toshiro, MOMMA Koichi, TANAKA Masahiko

    日本鉱物学会・学術講演会,日本岩石鉱物鉱床学会学術講演会講演要旨集 2004/09/22

  54. Crystallographic features of microcrystalline quartz crystallized from low temperature hydrothermal solution

    MOMMA Koichi, NAGASE Toshiro, KUDOH Yasuhiro, KURIBAYASHI Takahiro, TANAKA Masahiko

    日本鉱物学会・学術講演会,日本岩石鉱物鉱床学会学術講演会講演要旨集 2004/09/22

  55. Li-Mn Pectolite Type Mineral from Tanohata Mine, Iwate, Japan

    HORI Hidemichi, NAGASE Toshiro, KITAMINE Mizuya

    日本鉱物学会・学術講演会,日本岩石鉱物鉱床学会学術講演会講演要旨集 2004/09/22

  56. Reexamination of explosive eruption history of Baitoushan (Changbaishan) volcano

    MIYAMOTO Tsuyoshi, NAKAGAWA Mitsuhiro, NAGASE Toshiro, KANNO Hitoshi, OHBA Tsukasa, KITAMURA Shigeru, TANIGUCHI Hiromitsu

    Northeast Asian studies 2003/03/31

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    Baitoushan volcano (Changbaishan volcano in China), situated on the border between China and North Korea, is one of the most active volcanoes in mainland Asia. The volcanism is divided into three stages, firstly the shield volcano-forming stage effusing large amount of basaltic lava flow, secondly volcanic cone-building stage consisting of trachytic magma, and finally summit caldera (called Tianchi caldera)-forming stage erupting the vigorous alkali-rhyolitic pyroclastics. Tianchi caldera has been formed by some huge eruptions (10th century, 4000yBP eruption and more) since Pleistocene. In ...

  57. Crystallographic Information Acquired from Observations of Crystal Morphology

    NAGASE Toshiro

    Nihon Kessho Gakkaishi 2000/12/31

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    External form of polyhedral crystal provides information on the structural feature of the crystal. This article describes the relation between the external form and the structure of crystals.

  58. Microtexture and Microstructure of Minerals in Metastable Phases

    NAGASE Toshiro

    Nihon Kessho Gakkaishi 2000/04/30

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    Metastable phase, which has a lager value of Gibbs free energy than that of the stable phase, commonly occurs in nature against the thermodynamic regulation. Microtexture and microstructure of some metastable-phase minerals (opal-CT, marcasite and wurtzite) are studied by high-resolution transmission electron microscopy. Disordered stacking structures are commonly observed in the metastable phases. In the case of the opal-CT (Hosaka and Akase opal mines, Japan) and marcasite (Ikezuki, Japan), highly ordered domains appear around the domains with disordered stacking structure. Chocaya-Animas...

  59. Precipitation of metastable phases and kinetics of solution-mediated phase transformation

    KOJIMA Shoji, NAGASE Toshiro

    Journal of mineralogy,petrology and economic geology 1999/10/05

  60. 第17回国際鉱物学連合総会に参加して

    長瀬 敏郎

    鉱物学雜誌 = Journal of the Mineralogical Society of Japan 1998/11/01

  61. Cristobalite from Taihakusan, Sendai City

    OHAYAMA Tugio, ITOH Yoshinori, KITAKAZE Arashi, NAGASE Toshiro, AKIZUKI Mizuhiko

    Journal of mineralogy,petrology and economic geology 1998/09/05

  62. Electron microscopic investigations of the chalcopyrite disease texture(2). -TEM observations of natural samples

    NAGASE T, KOJIMA S

    資源地質 1995/08/31

  63. A coprecipitation experiment on the chalcopyrite disease texture involving Fe-bearing sphalerite

    KOJIMA Shoji, NAGASE Toshiro, INOUE Toru

    Journal of mineralogy,petrology and economic geology 1995/08/05

  64. An orbicular rock from Shiroishi, Miyagi Prefecture

    SUZUKI Ioki, AKIZUKI Mizuhiko, NAGASE Toshiro, FUJIMAKI Hirokazu

    Journal of mineralogy,petrology and economic geology 1995/04/05

  65. 閃亜鉛鉱 - 黄銅鉱共生組織における黄銅鉱の形態・粒径について

    小島 晶二, 長瀬 敏郎

    資源地質 1994/08/31

  66. 沖縄トラフ海底熱水サイトのチムニー初期生成過程に関する鉱物学的解析

    大森 敬太, 長瀬敏郎, 野崎 達生, 栗林 貴弘

    鉱物科学会年会

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Research Projects 35

  1. Investigation of ancient methane seepage in Sakhalin using silica clathrate minerals

    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: National Museum of Nature and Science, Tokyo

    2016/04/01 - 2021/03/31

  2. Information of stone property deciphered from mineral and rock texture

    Nagase Toshiro

    Offer Organization: Japan Society for the Promotion of Science

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

    Category: Grant-in-Aid for Challenging Exploratory Research

    Institution: Tohoku University

    2016/04/01 - 2019/03/31

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    Mineralogical analysis methods were applied for textures of stone property. Identification of the rock used in cultural properties and decipherment of the rock texture were carried out in this study. Research subjects are cultural property materials composed of andesite and siliceous rocks. Mineral and rock texture were observed by Raman spectroscopy, cathodoluminescence method, and optical microscopy, and chemical analyses carried out by an electron microprobe analyzer. Electron back-scattered diffraction analysis also used to identify the crystallographic direction of minerals. We tried to identify the mineralogical features of the stone and to identify the place of origin of the stone using these texture analysis

  3. Challenge to the formation of prebiotic RNA on mineral templates

    Furukawa Yoshihiro, KAKEGAWA TAKESHI, NAGASE TOSHIRO

    Offer Organization: Japan Society for the Promotion of Science

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

    Category: Grant-in-Aid for Challenging Exploratory Research

    Institution: Tohoku University

    2015/04/01 - 2017/03/31

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    This study challenged the formation of oligonucleotides on mineral templates. Gypsum and calcite were used as the template mineral since they are ion crystal that potentially presented on the early Earth. Four kinds of adenosine nucleotides were investigated as the monomer of the oligomerization experiments. As the results, oligonucleotides were formed on gypsum template and glass template. However, the reproducibility of the results and the effects of template remain unclear. Thus, additional experiments are conducted. Further, a borophosohate mineral, luneburgite, was investigated as the source of phosphorus in phosphorylation of nucleoside and found that this mineral serves phosphate effectively and promote the formation of nucleotide in a potential prebiotic environment. This work was published in Angwandte Chemie International Edition as a very important paper.

  4. Texture and growth process of low-crystallinity minerals from low-temperature solution

    Nagase Toshiro, KURIBAYASHI Takahiro, MIYAMOATO Tsuyoshi

    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: Tohoku University

    2013/04/01 - 2016/03/31

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    We researched about precipitation processes of low-crystallinity minerals, which have crystal structure with numerous defects, from low temperature solution on the basis of observations for their textures and occurrence. The low-crystallinity mineral, which precipitates under metastable condition or out of stable region, are major in mineral species on the earth, and contribute to the diversity of minerals. It is considered that origins of the metastable phase were effects of impurity and interface energy. We will propose a new model for nucleation process of low-crystallinity minerals.

  5. Experimental study on mechanical properties of plate interface of the northeastern Japan subduction zone

    NAGAHAMA Hiroyuki, MUTO Jun, NAGASE Toshiro, SHIMIZU Ichiko

    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

    2012/04/01 - 2015/03/31

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    In order to reveal the mechanism of the 2011 Tohoku Oki earthquake and subsequent post-seismic deformation of the northeastern Japan, we have conducted deformation experiments of a wide variety of rocks composing subduction zones. By the friction experiments using gas rig, frictional stability of quartz gouge is observed to be correlated to energy ratio of the gouge controlled by internal structure of gouges. Moreover, rupture velocity of serpentinites and olivine gouges depends on the their frictional coefficients and normal stress, implying that the slow slip in subduction zones illuminates the stress state of the plate boundary. By the shear experiments using Griggs rig, deformation mechanisms and creep strengths of feldspars are significantly reduced by the presence of water added externally into the samples under the lower crustal condition. We also proposed rheological models of the NE Japan island arc-trench systems and plate boundary causing the 2011 Tohoku Oki earthquake.

  6. Identification of primary producers in the early oceans

    KAKEGAWA Takeshi, HASHIZUME Ko, NAGASE Toshirou

    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

    2012/04/01 - 2015/03/31

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    The purposes of the present study are to constrain biological primary producers in 3.8, 3.2, and 3.0 Ga oceans. To approach the purpose, we performed geological surveys in Isua (Greenland), Barberton (S. Africa), and Steep Rock and Lumby Lake (Canada). Besides the detailed geological data, mineralogical and geochemical data suggest that cyanobacteria were the primary producers at least since 3.0 Ga. In addition, chemoautotrophic and heterotrophic bacteria, whose activities were supported by cyanobacteria indirectly, were also active in deep sedimentary basin. We also discovered new evidence for trace of the earliest life in rocks from Isua. This discovery was broadcasted widely through various media. Other results were reported at the major international conferences. Some papers are in reviews at major international journals.

  7. 過去5000年間における白頭山の噴火活動と周辺地域への歴史的影響 Competitive

    2006/04 - 2008/03

  8. Bio-molecule formation by oceanic impact events on the early Earth

    KAKEGAWA Takeshi, NAGASE Toshirou, NAKAZAWA Hiromoto, SEKINE Toshimori

    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

    2006 - 2008

  9. Bio-molecule formation by oceanic impact events on the early Earth Competitive

    Takeshi KAKEGAWA

    Offer Organization: Ministry of Education, Culture, Sports, Science and Technology

    System: Grants-in-Aid for Scientific Research(基盤研究(A))

    2006 - 2008

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    本研究は、初期地球の海洋に隕石が衝突し、そこでアミノ酸が生成され、そのアミノ酸が地球内部で重合し、やがて生命に進化したことを実験的に検証する課題である。隕石の海への落下実験に成功し、世界で初めて衝撃環境でのアミノ酸生成に成功した。地殻内部での高温高圧条件でアミノ酸重合にも世界で初めて成功し、タンパク質前駆体のペプチドを生成した。

  10. Joint research among Japan, Korea and China on the active history and magma of Baitoushan Volcano

    TANIGUCHI Hiromitsu, KURITANI Takeshi, MIYAMOTO Tsuyoshi, NAGASE Toshirou, KANNO Hitoshi, GOTO Akio, NAKAGAWA Mitsuhiro, OKUNO Mituru, BAN Masao, MAENO Fukashi, SHIMANO Taketo, ITAYA Tetsumaru, YASUDA Yoshinori, UEKI Sadato, FURUHATA Toru, KOJIMA Yoshitaka

    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

    2005 - 2008

  11. Joint research among Japan, Korea and China on the active history and magma of Baitoushan Volcano Competitive

    Hiromitsu TANIGUCHI

    Offer Organization: Ministry of Education, Culture, Sports, Science and Technology

    System: Grants-in-Aid for Scientific Research(基盤研究(A))

    2005 - 2008

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    頭山およびそれを包括する蓋馬溶岩台地に関して、現地調査、衛星データー解析、採集した資料の化学分析・年代分析、国内の関連地層の調査・年代分析などの手法を用いて、白頭山10世紀巨大噴火の概要、白頭山及び蓋馬溶岩台地の火山学的な実態を明らかにしようとした。開始してから1年後に北朝鮮のミサイル問題・核開発問題などの諸問題が発生し、現地での調査や研究者との交流などの実施が徐々に困難になっていった。そのため、すでに収集していた試料の分析、衛星データーの解析及び国内での調査に研究の主力を移し、可能な限りの成果を得ようとした。その結果、近年発生している白頭山における地震多発とマグマ活動との関係、存在は知られているが分布や内容が全く未知である蓋馬溶岩台地の概要が明らかになり、更に、地下におけるマグマの成因についても一定の結論を得た。混乱状態にある白頭山10世紀噴火の年代問題をふくめ、また、北朝鮮からの論文を含め、研究成果は12編の論文として論文集にまとめられつつある。

  12. Modeling of slab stagnation and falling processes

    OHTANI Eiji, SUZUKI Akio, TERESAKI Hidenori, NAGASE Toshio, HIROSE Kei, MURAKAMI Motohiko, SAKAI Takeshi, KONDO Tadashi, KUBO Tomoaki, KOMIYA Tsuyoshi, OOISHI Yasuo

    Offer Organization: Japan Society for the Promotion of Science

    System: Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Priority Areas

    Category: Grant-in-Aid for Scientific Research on Priority Areas

    Institution: Tohoku University

    2004 - 2008

  13. Modeling of slab stagnation and falling processes Competitive

    Eiji OHTANI

    Offer Organization: Ministry of Education, Culture, Sports, Science and Technology

    System: Grants-in-Aid for Scientific Research(特定領域研究)

    2004 - 2008

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    水の存在下でマントル遷移層の相転移境界の深さが変化する。揮発性物質を含むマグマの密度測定によると、このマグマが上部マントル最下部で安定である。これらの結果から滞留した深部スラブからの脱水と上部マントル下部での重い含水マグマの生成というDeep Dehydration modelを提案した。パイロライトやMORB組成中のポストペロフスカイト相転移境界を決定し、D"不連続面の成因をあきらかにした。下部マントル全域でMORB成分はカンラン岩成分より重く、核マントル境界にMORB成分が堆積する。

  14. 白頭山東部における10世紀巨大噴火と遼・高麗王朝への歴史的影響 Competitive

    2004/04 - 2005/03

  15. Kinetics of the post-gamet transformation and dynamics of the subducting oceanic plates

    KUBO Tomoaki, KATO Takumi, UEHARA Seiichiro, KONDO Tadashi, OHTANI Eiji

    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)

    2003 - 2004

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    We have developed techniques on high-pressure generations using sintered diamond multi-anvil systems combined with synchrotron radiation, which enables to obtain time-resolved X-ray diffraction data every 10-30 seconds up to 35 GPa and 2000K. We also tested new sintered diamond anvils manufactured by Ringwood Superabrasives for the X-ray window of multi-anvil apparatus. Based on these techniques, we have quantitatively studied on kinetics of post garnet transformations in natural garnet, high-pressure transformations in pyroxenes (enstatite and diopside), and effects of water on the olivine-spinel transformation kinetics. Transformation microstructures and water contents of samples recovered were examined using TEM and FTIR. In addition to these studies, we have also examined about formation of metastable cubic perovskite, dehydration reaction of high-pressure hydrous minerals, and mechanisms and kinetics of high-pressure transformations in shocked meteorites, those have important implications for subduction processes. Cation diffusion kinetics in wadsleyite have been experimentally examined and rheology of subducting plates and mantle transition zone was discussed. We have extrapolated quantitative kinetic data obtained to subduction zone conditions and construct metastable mineralogy in subducting plates. We have calculated the density of subducting slabs taking transformation kinetics into accounts, which suggests that the subducting slabs are buoyant at the top of the lower mantle due to the presence of metastable low-pressure phases. Grain-size reductions caused by non-equilibrium transformations can reduce strength of subducting plates. These are important for the formation of stagnant slabs at the top of the lower mantle.

  16. Kinetics of the post-gamet transformation and dynamics of the subducting oceanic plates Competitive

    Tomoaki KUBO

    Offer Organization: Ministry of Education, Culture, Sports, Science and Technology

    System: Grants-in-Aid for Scientific Research(基盤研究(B))

    2003 - 2004

    More details Close

    We have developed techniques on high-pressure generations using sintered diamond multi-anvil systems combined with synchrotron radiation, which enables to obtain time-resolved X-ray diffraction data every 10-30 seconds up to 35 GPa and 2000K. We also tested new sintered diamond anvils manufactured by Ringwood Superabrasives for the X-ray window of multi-anvil apparatus.Based on these techniques, we have quantitatively studied on kinetics of post garnet transformations in natural garnet, high-pressure transformations in pyroxenes (enstatite and diopside), and effects of water on the olivine-...

  17. 多結晶材料集合組織の数値シミュレーション技法を導入した岩石組織研究の新展開

    中村 美千彦, 長瀬 敏郎

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 萌芽研究

    Category: 萌芽研究

    Institution: 東北大学

    2002 - 2004

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    珪酸塩鉱物の多結晶体からなる岩石は、少量の水分が存在すると粒成長速度が大きく増加する。しかし水が流体として独立な相として存在し、その量がある閾値(臨界流体量)を超えると、逆に水が粒界移動を妨げ粒成長速度を低下させる。我々はまず合成ダナイト・ウェーライトの合成実験を行い、臨界流体量と粒成長則を決定した(大内・中村2004年地球惑星科学関連合同大会・日本地質学会)。臨界粒体量は3-5vol.%程度であり、すなわち鉱物結晶内への水の固溶限界を大きく超え少量の流体相として存在する状態が最大となる。これは、流体相や粒界を介しての溶解-析出過程によって粒成長が促進されるためであると考えられる。また粒成長の冪乗則におけるnの値は5-9と非常に大きくなり、流体によるZener pinningが粒成長を律速していることがわかった。また、岩石中の粒径不均質は、界面曲率に基づく溶解度の効果によって流体量の再分布を起こす(Wark&Watson,2000)。この流体量はさらに粒成長速度に影響するため、流体量と粒成長速度の間にはフィードバックシステムが成立する。そこで、粒成長速度の流体量分布依存性として液相焼結におけるGerman & Olevsky(1998)のモデルを用い、流体量と結晶粒径に一次元的な揺らぎのある初期条件の下で粒成長する岩石の組織形成の数値シミュレーションを行った。その結果、初期流体量が臨界閾値以上の場合には自己組織化が発生することがわかった。たとえば部分溶融体においてこのような流体に富む部分の流体量(岩石マトリクスの空隙率)でメルトの分離と岩石マトリクスの圧密が発生すれば、段階的な分別溶融作用が起こり、またその後の粒成長速度は大幅に低下して岩石の縞状構造が保存される。このように粒成長と粒子サイズ効果のカップリングは、岩石中の流体移動やメルト分離を支配している可能性がある。

  18. 多結晶材料集合組織の数値シミュレーション技法を導入した岩石組織研究の新展開 Competitive

    中村 美千彦

    Offer Organization: 文部科学省

    System: 科学研究費補助金(萌芽研究)

    2002 - 2004

    More details Close

    珪酸塩鉱物の多結晶体からなる岩石は、少量の水分が存在すると粒成長速度が大きく増加する。しかし水が流体として独立な相として存在し、その量がある閾値(臨界流体量)を超えると、逆に水が粒界移動を妨げ粒成長速度を低下させる。我々はまず合成ダナイト・ウェーライトの合成実験を行い、臨界流体量と粒成長則を決定した(大内・中村2004年地球惑星科学関連合同大会・日本地質学会)。臨界粒体量は3-5vol.%程度であり、すなわち鉱物結晶内への水の固溶限界を大きく超え少量の流体相として存在する状態が最大となる。これは、流体相や粒界を介しての溶解-析出過程によって粒成長が促進されるためであると考えられる。また粒成長の冪乗則におけるnの値は5-9と非常に大きくなり、流体によるZener pinningが粒成長を律速していることがわかった。また、岩石中の粒径不均質は、界面曲率に基づく溶解度の効果によって流体量の再分布を起こす(Wark&Watson,2000)。この流体量はさらに粒成長速度に影響するため、流体量と粒成長速度の間にはフィードバックシステムが成立する。そこで、粒成長速度の流体量分布依存性として液相焼結におけるGerman & Olevsky(1998)のモデルを用い、流体量と結晶粒径に一次元的な揺らぎのある初期条件の下で粒成長する岩石の組織形成の数値シミュレーションを行った。その結果、初期流...

  19. 中国東北部白頭山の10世紀巨大噴火とその歴史的効果 Competitive

    2000/04 - 2003/03

  20. High temperature high pressure crystal structures and phase changes of subduction zone minerals.

    KUDOH Yasuhiro, KAGI Hiroyuki, KURIBAYASHI Takahiro, NAGASE Toshiro

    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

    2001 - 2003

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    Sets of X-ray diffraction intensities up to 7.9 GPa of a single crystal of 35x35x24 micron hydrous ringwoodite Mg_<1.97>SiH_<0.06>O_4, synthesized by Ohtani and Mizobata (1998) using a multi-anvil apparatus at conditions of 1680 ℃ and 22 GPa were measured using synchrotron radiation at the beam line BL-10A, Photon Factory, High Energy Accelerator Research Organization, Tukuba, Japan. The modified Merrill-Bassett type diamond anvil pressure cell was used. The 4:1 fluid mixture of methanol and ethanol was used for pressure medium. The compressibility of the unit cell is close to the compressibility of the MO_6 octahedron. The mean Si-O distance stay almost constant up to 7.9 GPa. The compression of the crystal structure is governed by the compression of MO_6 octahedron. This is consistent to the fact that the bulk modulus is affected significantly by the substitution of Mg by 2H. The octahedral shared edges are compressed more than the unshared edges, keeping the edge lengths of SiO_4 tetrahedron almost constant. The space group and hydrogen positions of δ-(Al_<0.84>4Mg_<0.07>Si_<0.09>)OOH are investigated using a single crystal synthesized using a multi-anvil apparatus under conditions of 1000 ℃ and 21 GPa. The space group determined by single-crystal x-ray diffraction is to Pnn2, with unit cell parameters of a=4.6975(8)Å, b=4.2060(6)Å, c=2.8327(4)Å, and V=55.97(1)Å^3. Partial occupancy of the Al site by Mg and Si suggests the possibility of a limited solid solution between δ-AlOOH, stishovite, and a hypothetical CaCl_2-type Mg(OH)_2 that is 16% denser than brucite. Difference Fourier maps reveal two small but significant Fourier peaks attributable to hydrogen atoms. Atomic distances and angles around the first peak indicate a hydrogen bond with O【triple bond】O distances of 2.511Å, while those around the second peak are suggestive of a bifurcated hydrogen bond with O【triple bond】O distances of 2.743Å and 2.743Å.

  21. Biological activities at the Archean submarine hydrothermal environments

    KAKEGAWA Takeshi, NAGASE Toshiro

    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

    2001 - 2003

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    Hydrothermal origin of life on the Archean seafloor is becoming a popular theory, besides the idea that the evolution of early biota took place at the submarine hydrothermal environments Abundant submarine hydrothermal sediments have been found in the Archean strata and there exists possibility that remnants of early biota and chemical fossils of their ecosystem were still preserved in these sediments. The main purpose of this study is to identify the remnants of early biota and their ecosystem based on the geological and geochemical ways. In this study, detailed geological surveys were conducted in two areas : the 2.7 Ga Abitibi Greenstone Belt and 3.2 Ga Pilbara Blocks in Australia. Other samples related to Archean submarine hydrothermal activities and modern hydrothermal activities were also subjects for the chemical analyses in this study. The followings are the notable findings from this study : specific hydrothermal alterations by carbon dioxide-rich fluids and mobilization of phosphorous from oceanic crust, age specific activity of methane-related biota and their association with magmatic activity and metal enrichments in organic matter by hydrothermal reaction. New ecological energy exchange system was also found in the modern hydrothermal sediments and its links to Archean ecosystem was also proposed. These achievements were already published in the several international and domestic journals, and also reported at international conferences as invited talks. New theory of biological evolution associated with the contemporary magmatic activity is also proposed from this study.

  22. Joint study among Japan, China and Korea, about Baitoushan volcano in Northeast China, its magma history and the 10^<th> century big eruption

    TANIGUCHI Hiromitsu, MIYAMOTO Tsuyoshi, NAGASE Toshiro, NARISAWA Masaru, NAKAGAWA Mitsuhiro, KANNO Hitoshi

    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

    2001 - 2003

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    Baitoushan volcano, situated on the border between China and North Korea, is one of the most active volcanos in the world, and is known by the 10^<th> century big eruption. Our research intends to clarify the details of this 10^<th> century eruption and its historic effects on the surrounding area. For this purpose, we have investigated geological and petrological features of the volcanic products by the field survey on the Chinese area. In addition to this approach, we made the reexamination of the historic documents existing in Korea, China and Japan. The following things have been newly found by this research. (1)The 10^<th> century eruption consists of two eruptive phases with minor dormancy, and the two times of huge ignimbrite eruption have occurred at the very short period. (2)The 9^<th> century eruption, which wasn't known so far, was found. It has possibility that this new eruption has affected the extinction of Bo-Hai dynasty. (3)The 10^<th> century eruption age is around AD 938, based on the chronological study and literature research. (4)The distribution map indicating the "Abolishment of Township" is good agreement with the area of 10^<th> century eruption ejecta. It is considered that this implies the disaster area induced by this big eruption.

  23. High temperature high pressure crystal structures and phase changes of subduction zone minerals. Competitive

    Yasuhiro KUDOH

    Offer Organization: Ministry of Education, Culture, Sports, Science and Technology

    System: Grants-in-Aid for Scientific Research(基盤研究(A))

    2001 - 2003

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    Sets of X-ray diffraction intensities up to 7.9 GPa of a single crystal of 35x35x24 micron hydrous ringwoodite Mg_<1.97>SiH_<0.06>O_4, synthesized by Ohtani and Mizobata (1998) using a multi-anvil apparatus at conditions of 1680 ℃ and 22 GPa were measured using synchrotron radiation at the beam line BL-10A, Photon Factory, High Energy Accelerator Research Organization, Tukuba, Japan. The modified Merrill-Bassett type diamond anvil pressure cell was used. The 4:1 fluid mixture of methanol and ethanol was used for pressure medium. The compressibility of the unit cell is close to the compressi...

  24. Biological activities at the Archean submarine hydrothermal environments Competitive

    Takeshi KAKEGAWA

    Offer Organization: Ministry of Education, Culture, Sports, Science and Technology

    System: Grants-in-Aid for Scientific Research(基盤研究(B))

    2001 - 2003

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    Hydrothermal origin of life on the Archean seafloor is becoming a popular theory, besides the idea that the evolution of early biota took place at the submarine hydrothermal environments Abundant submarine hydrothermal sediments have been found in the Archean strata and there exists possibility that remnants of early biota and chemical fossils of their ecosystem were still preserved in these sediments. The main purpose of this study is to identify the remnants of early biota and their ecosystem based on the geological and geochemical ways. In this study, detailed geological surveys were con...

  25. Joint study among Japan, China and Korea, about Baitoushan volcano in Northeast China, its magma history and the 10^<th> century big eruption Competitive

    Hiromitsu TANIGUCHI

    Offer Organization: Ministry of Education, Culture, Sports, Science and Technology

    System: Grants-in-Aid for Scientific Research(基盤研究(B))

    2001 - 2003

    More details Close

    Baitoushan volcano, situated on the border between China and North Korea, is one of the most active volcanos in the world, and is known by the 10^<th> century big eruption. Our research intends to clarify the details of this 10^<th> century eruption and its historic effects on the surrounding area. For this purpose, we have investigated geological and petrological features of the volcanic products by the field survey on the Chinese area. In addition to this approach, we made the reexamination of the historic documents existing in Korea, China and Japan. The following things have been newly ...

  26. Contribution of structural defects to nucleation process of metastable phase

    NAGASE Toshiro

    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: Tohoku University

    2001 - 2002

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    Disordered stack ings are commonly 'observed in the metastable phase. In the cases of opal-CT and moganite, the disordered domains have following common features; (1) the stacking sequence are completely disorder without periodic sequences such as highly ordered polytypes; (2) the planar faults are parallel to each other in the disordered domain; (3) the domain of disordered stackings exhibits a thin and platy form, which elongates parallel to the planar defects; (4) the domains of well ordered stackings overgrew on the domain of disordered stackings with very sharp boundary between the two domains (5) The basal plane of the platyshaped domain of disordered stackings is parallel to a singular surface of the crystal, and the singular plane. The disordered, structure is caused by two-dimensional nucleation growth mechanism under highly supersaturated conditions. The results of observations suggest that important factors for formation of metastable phase are supersaturation degree and admissibility of crystal structure for defects.

  27. Contribution of structural defects to nucleation process of metastable phase Competitive

    Toshiro NAGASE

    Offer Organization: Ministry of Education, Culture, Sports, Science and Technology

    System: Grants-in-Aid for Scientific Research(基盤研究(C))

    2001 - 2002

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    Disordered stack ings are commonly 'observed in the metastable phase. In the cases of opal-CT and moganite, the disordered domains have following common features; (1) the stacking sequence are completely disorder without periodic sequences such as highly ordered polytypes; (2) the planar faults are parallel to each other in the disordered domain; (3) the domain of disordered stackings exhibits a thin and platy form, which elongates parallel to the planar defects; (4) the domains of well ordered stackings overgrew on the domain of disordered stackings with very sharp boundary between the two...

  28. シュードタキライト・粉体岩の性状にもとづく地震性摩擦すべり構成則の再構築

    大槻 憲四郎, 加藤 尚之, 大谷 栄治, 斎藤 文良, 長瀬 敏郎

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 基盤研究(A)

    Category: 基盤研究(A)

    Institution: 東北大学

    1997 - 1998

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    野島地震断層などから採取した断層岩を解析し,自然界で作動している地震性摩擦すべりの物理過程を解読した。 1.震源核生成の後に,thermal pressurization,ガウジのfluidization,およびガウジの熔融という過程が相次いで立ち上がる.これらは摩擦抵抗を低下させる正のフィードバックであり,観察された異常に薄いシュードタキライト層を説明する. 2.野島断層岩は3-5kmの深度で形成されたもので,シュードタキライトの基質は珪酸塩ガラスであり,ムライトがふくまれていることから,摩擦発熱による熔融・急冷の産物である. 3.ガラス基質と含水花崗岩の平衡最少熔融体との元素組成の関係,高温安定鉱物の存在,古いシュードタキライト破片の流動化,カリ長石と斜長石粒子の周縁部流動変形などの諸現象は,低熔融度のシュードタキライトは720℃以上,高溶融度のものは1200℃にまで達したことを示唆する。 4.熔融体の粘性率を決定する珪酸と水の含有量,未熔融団体粒子の体積分率,温度などを求めて解析した結果,高速すべりは粘性率が著しく高い熔融初期に抑制されることが分つた。 5.一回の地震イベントの中で,熔融体はしばしば未熔融粉体と共存し,熔融体の滴が粉体中に飛び散つている。このことは粉体がfluidizeしていたことを示す。Fluidizationを判定する「破片対の発見確率」による方法を新たに開発した。またfluidizationによつて摩擦抵抗が劇的に減少することを明らかにした. 6.上記の3つの物理過程を考慮し,定性的な地震性摩擦すべり構成則を提示した。とくにfluidizationは劇的な摩擦抵抗の低下を,その直後に起こる熔融の初期は摩擦抵抗の劇的な増加をもたらし,slip pulseを発生させる.

  29. シュードタキライト・粉体岩の性状にもとづく地震性摩擦すべり構成則の再構築 Competitive

    大槻 憲四郎

    Offer Organization: 文部科学省

    System: 科学研究費補助金(基盤研究(A))

    1997 - 1998

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    野島地震断層などから採取した断層岩を解析し,自然界で作動している地震性摩擦すべりの物理過程を解読した。1.震源核生成の後に,thermal pressurization,ガウジのfluidization,およびガウジの熔融という過程が相次いで立ち上がる.これらは摩擦抵抗を低下させる正のフィードバックであり,観察された異常に薄いシュードタキライト層を説明する.2.野島断層岩は3-5kmの深度で形成されたもので,シュードタキライトの基質は珪酸塩ガラスであり,ムライトがふくまれていることから,摩擦発熱による熔融・急冷の産物である.3.ガラス基質と含水花崗岩の平衡最少熔融体との元素組成の関係,高温安定鉱物の存在,古いシュードタキライト破片の流動化,カリ長石と斜長石粒子の周縁部流動変形などの諸現象は,低熔融度のシュードタキライトは720℃以上,高溶融度のものは1200℃にまで達したことを示唆する。4.熔融体の粘性率を決定する珪酸と水の含有量,未熔融団体粒子の体積分率,温度などを求めて解析した結果,高速すべりは粘性率が著しく高い熔融初期に抑制されることが分つた。5.一回の地震イベントの中で,熔融体はしばしば未熔融粉体と共存し,熔融体の滴が粉体中に飛び散つている。このことは粉体がfluidizeしていたことを示す。Fluidizationを判定する「破片対の発見確率」による方法を新たに開発...

  30. 鉱石鉱物の共生組織の生成過程についての研究

    長瀬 敏郎

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 奨励研究(A)

    Category: 奨励研究(A)

    Institution: 東北大学

    1995 - 1995

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    微細黄銅鉱と閃亜鉛鉱の共生組織は“黄銅鉱病変組織"と呼ばれ,その組織は交代反応もしくは同時沈殿により生じたと考えられている。そこで,天然試料と両生成機構による合成試料に対しSEM,TEM観察とAEM分析を行い,交代・同時沈殿両組織の判断規準並びに両機構より生じた組織の特徴について検討した。 (SEM組成像観察) 豊羽鉱山産試料では閃亜鉛鉱を切る黄銅鉱細脈に沿ってラメラ状・粒状の黄銅鉱が観察され,鉄に富む閃亜鉛鉱中にラメラ状黄銅鉱が出現することは交代反応の合成試料の特徴と一致する。長時間反応させた合成試料では閃亜鉛鉱は多孔質となり、黄銅鉱包有物は塊状の形態を呈することから,交代反応での微細黄銅鉱の形態は閃亜鉛鉱組成及び反応時間に大きく依存する。同時沈殿により生成された合成試料及び餌釣・古遠部両鉱山産試料は鉄に乏しく,その変化も殆どみられない。両鉱山産試料では数μm以下の不規則粒状黄銅鉱が観察され,同時沈殿の合成試料に類似する。 (TEM観察・AEM分析) AEM分析結果ならびに電子線回折像から豊羽・餌釣鉱山産病変組織内の微細包有物は黄銅鉱と考えられ,閃亜鉛鉱とはトポタキシ-の関係をもつ。豊羽鉱山産試料のラメラ状黄銅鉱(長径0.2〜3.3μm,幅0.05〜0.8μm)は(100)面に平行な方向に伸長している。閃亜鉛鉱との境界は複雑に入り組んでおり,刃状転移のような欠陥が観察されることから,両者はsemicoherentな関係にあると考えられる.一方,餌釣鉱山産試料では黄銅鉱(長径0.5〜1.2μm)は紡錐状・粒状のより自形に近い形態を示し,豊羽鉱山試料に見られた著しい欠陥は両結晶の境界付近では観察されない. 以上の結果より,交代反応及び同時沈殿を識別する判断基準としては黄銅鉱の形態と閃亜鉛鉱内の欠陥分布等が挙げられ,それらを知る上でSEM,TEMによる研究は極めて重要である.

  31. 鉱石鉱物の共生組織の生成過程についての研究 Competitive

    長瀬 敏郎

    Offer Organization: 文部科学省

    System: 科学研究費補助金(奨励研究(A))

    1995 - 1995

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    微細黄銅鉱と閃亜鉛鉱の共生組織は“黄銅鉱病変組織"と呼ばれ,その組織は交代反応もしくは同時沈殿により生じたと考えられている。そこで,天然試料と両生成機構による合成試料に対しSEM,TEM観察とAEM分析を行い,交代・同時沈殿両組織の判断規準並びに両機構より生じた組織の特徴について検討した。(SEM組成像観察) 豊羽鉱山産試料では閃亜鉛鉱を切る黄銅鉱細脈に沿ってラメラ状・粒状の黄銅鉱が観察され,鉄に富む閃亜鉛鉱中にラメラ状黄銅鉱が出現することは交代反応の合成試料の特徴と一致する。長時間反応させた合成試料では閃亜鉛鉱は多孔質となり、黄銅鉱包有物は塊状の形態を呈することから,交代反応での微細黄銅鉱の形態は閃亜鉛鉱組成及び反応時間に大きく依存する。同時沈殿により生成された合成試料及び餌釣・古遠部両鉱山産試料は鉄に乏しく,その変化も殆どみられない。両鉱山産試料では数μm以下の不規則粒状黄銅鉱が観察され,同時沈殿の合成試料に類似する。(TEM観察・AEM分析) AEM分析結果ならびに電子線回折像から豊羽・餌釣鉱山産病変組織内の微細包有物は黄銅鉱と考えられ,閃亜鉛鉱とはトポタキシ-の関係をもつ。豊羽鉱山産試料のラメラ状黄銅鉱(長径0.2〜3.3μm,幅0.05〜0.8μm)は(100)面に平行な方向に伸長している。閃亜鉛鉱との境界は複雑に入り組んでおり,刃状転移のような欠陥が観察されること...

  32. SiO2準安定鉱物の形成過程ならびに組織、構造の変化についての実験的研究

    長瀬 敏郎

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業 奨励研究(A)

    Category: 奨励研究(A)

    Institution: 東北大学

    1993 - 1993

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    石英の準安定相であるopal-CTの形成過程を明らかにするため、熱水合成実験ならびにその生成物の解析を行い、さらに天然に産するopal-CTの解析の結果との比較を行った。熱水合成実験では出発物質として粒径を調整した高純度シリカゲルを用い、反応溶液は0.1NのKOH溶液を用いた。さまざまな割合で反応溶液と出発物質をシリカチューブに封入し、150〜300度の温度で合成を行った。opal-CTは温度180度から200度の実験で生成が確認され、250度以上では、石英のみの生成が確認された。実験後、生成場所が特定できるように、シリカチューブから生成物を慎重に取り出しSEM試料を作製し、残りを粉末X線解析に施した。SEMでの観察により以下の様な組織的変化が明らかとなった。反応溶液が出発物質の容積より少ない場合、opal-CTは出発物質であるシリカゲルの隙間を満たし、シリカゲルを取り巻くように形成しており、シリカゲルは徐々に溶脱する。さらに反応が進むと、そのシリカゲルが溶脱した抜け穴部分に石英の球晶が生成し沈殿する。反応溶液の容積が出発物質より多い場合は、出発物質の最上部に石英の球晶のみからなる層の沈殿がみられ、この上層部分に:opal-CTは見られない。また、シリカチューブ壁面においても石英がシリカガラスの溶脱と同時に形成されている。この時、シリカゲル内部の組織は反応溶液が少ない場合と同じである。このことからシリカゲルの粒間での反応と上澄み溶液中での反応経路は大きくことなり、粒間ではopal-CTの準安定相の形成されるが、上澄み溶液中では直接石英が形成されている。このことはそれぞれの場での溶液中のシリカ濃度が大きく異なっているためと考えられ、シリカゲルと多く接している粒間の溶液の方が、シリカゲルの高い溶解度のため、より速く高濃度溶液となり、opal-CTの生成が起こったのに対し、上澄み溶液では、濃度が上昇速度が遅く、過飽和度があがる前に石英の生成が起こったと考えられる。以上の熱水合成実験結果からopal-CTはシリカゲルの溶解沈殿反応により生成され、そして形成の場に大きく関与することが明らかになった。また、この解析結果から、opal-CTの溶解沈殿相転移速度は従来の実験値より1/2〜1/3倍遅いことが明らかとなった。今回合成されたopal-CTは全て、opal-CT lepisphere と呼ばれる形態をもつタイプである。天然でのopal-CTの試料について組織の観察した結果では、このlepisphereは結晶粒間や空隙部など自由な成長空間でかなり長期にわたり溶液と反応を起こして生成したと考えられるものに多く、この点について、今回の実験と比較すると、粒間に生成される部分では一致するが、大きな空隙部では一致しない。天然において空隙部に産する場合は、シリカに非常に過飽和な溶液が空隙部をみたし、これから形成したと考えられる。また、このlepisphereの最強X線ピークは約4.08〜4.09Åと、天然の試料の値と一致し、現在の段階ではこの値はlepisphereの固有値と考えられる。

  33. SiO2準安定鉱物の形成過程ならびに組織、構造の変化についての実験的研究 Competitive

    長瀬 敏郎

    Offer Organization: 文部科学省

    System: 科学研究費補助金(奨励研究(A))

    1993 - 1993

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    石英の準安定相であるopal-CTの形成過程を明らかにするため、熱水合成実験ならびにその生成物の解析を行い、さらに天然に産するopal-CTの解析の結果との比較を行った。熱水合成実験では出発物質として粒径を調整した高純度シリカゲルを用い、反応溶液は0.1NのKOH溶液を用いた。さまざまな割合で反応溶液と出発物質をシリカチューブに封入し、150〜300度の温度で合成を行った。opal-CTは温度180度から200度の実験で生成が確認され、250度以上では、石英のみの生成が確認された。実験後、生成場所が特定できるように、シリカチューブから生成物を慎重に取り出しSEM試料を作製し、残りを粉末X線解析に施した。SEMでの観察により以下の様な組織的変化が明らかとなった。反応溶液が出発物質の容積より少ない場合、opal-CTは出発物質であるシリカゲルの隙間を満たし、シリカゲルを取り巻くように形成しており、シリカゲルは徐々に溶脱する。さらに反応が進むと、そのシリカゲルが溶脱した抜け穴部分に石英の球晶が生成し沈殿する。反応溶液の容積が出発物質より多い場合は、出発物質の最上部に石英の球晶のみからなる層の沈殿がみられ、この上層部分に:opal-CTは見られない。また、シリカチューブ壁面においても石英がシリカガラスの溶脱と同時に形成されている。この時、シリカゲル内部の組織は反応溶液が少ない場合と同...

  34. Structural study of minerals as a function of temperature, pressure and composition

    KUDOH Yasuhiro, NAGASE Toshiro, AKIZUKI Mizuhiko

    Offer Organization: Japan Society for the Promotion of Science

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

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

    Institution: TOHOKU UNIVERSITY

    1991 - 1993

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    Structural studies at high pressures of fluorite, CaF_2, hedenbergite, CaFeSi_2O_6, Superhydrous phase B, Mg_<20>Si_6H_8O_<36> and Phase F, Mg_<3.35>Si_<5.51>H_<7.26>O_<18> were done using a diamond anvil high pressure cell and monochromatized synchrotron radiation at Photon Factory, National Laboratory for High Energy Physics. Pressure induced phase transition of CaF_2 from cubic fluorite structure to the alpha-PbCl_2 type structure below 8.3 GPa was confirmed. The increase of bulk modulus with increasing Fe content of Ca(Fe, Mg)Si_2O_6 was observed. The crystal structure of superhydrous phase B was determined. The effect of pressure on the crystal structure was studied up to 6.5 GPa. The bulk modulus observed was 145 GPa. The cation-disordered crystal structure of phase F was determined using a small single crystal with dimensions of 18_x24_x30 micron.

  35. Structural study of minerals as a function of temperature, pressure and composition Competitive

    Yasuhiro KUDOH

    Offer Organization: Ministry of Education, Culture, Sports, Science and Technology

    System: Grants-in-Aid for Scientific Research(一般研究(C))

    1991 - 1993

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    Structural studies at high pressures of fluorite, CaF_2, hedenbergite, CaFeSi_2O_6, Superhydrous phase B, Mg_<20>Si_6H_8O_<36> and Phase F, Mg_<3.35>Si_<5.51>H_<7.26>O_<18> were done using a diamond anvil high pressure cell and monochromatized synchrotron radiation at Photon Factory, National Laboratory for High Energy Physics.Pressure induced phase transition of CaF_2 from cubic fluorite structure to the alpha-PbCl_2 type structure below 8.3 GPa was confirmed.The increase of bulk modulus with increasing Fe content of Ca(Fe, Mg)Si_2O_6 was observed.The crystal structure of superhydrous phas...

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Social Activities 27

  1. 水晶の魅力

    石川町歴史基本構想策定事業

    2018/10/13 - 2018/10/13

  2. 石の話

    「県の石展」関連イベント 講演会

    2018/04/01 - 2018/04/01

  3. 石川の鉱物の魅力

    「県の石」選定記念特別講演会

    2017/08/20 - 2017/08/20

  4. 小企画展「県の石展」

    小企画展「県の石展」

    2017/02/14 - 2017/04/15

  5. 企画展 北川隆司鉱物コレクション展─ 教授を魅了した大地の結晶 ─

    2014/03/01 - 2014/04/12

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    東北大学自然史標本館において企画展「企画展 北川隆司鉱物コレクション展─ 教授を魅了した大地の結晶 ─」(共催:日本鉱物科学会・日本粘土学会、日本結晶学会 協力:国立科学博物館)を開催した

  6. 第60回仙台市児童・生徒理科作品展審査委員

    2013/09/25 - 2013/09/26

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    仙台市児童・生徒理科作品展審査委員

  7. 第59回仙台市児童・生徒理科作品展審査委員

    2012/09/25 - 2012/09/26

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    仙台市児童・生徒理科作品展審査委員

  8. 第58回仙台市児童・生徒理科作品展審査委員

    2011/09/28 - 2011/09/29

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    仙台市児童・生徒理科作品展審査委員

  9. 企画展 東北大学総合学術博物館のすべて XI「まっくろ黒鉱―驚きに満ちた鉱石」

    2010/11/05 - 2010/11/28

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    仙台市科学館において「企画展「東北大学総合学術博物館のすべて」シリーズ 「まっくろ黒鉱―驚きに満ちた鉱石」を開催した

  10. 東北大学川内萩ホール ギャラリー展示 「東北大学がもっているおもしろいかたち●▲■(マル・サンカク・シカク)」

    2009/11/06 - 2010/01/31

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    「東北大学がもっているおもしろいかたち●▲■(マルサンカクシカク)」展を、2009年11月6日から東北大学川内萩ホール1階展示ギャラリーにて開催しました。当初の会期は2010年1月31日までとなっていましたが、会期終了間際にNHKテレビや読売新聞の取材もあり、これまでになく大勢の来場者に恵まれました。そこで、今後ご来場を望まれる方々のために、急遽会期を延長することとし、3月31日(水)まで延長開催いたしました。

  11. 企画展 東北大学総合学術博物館のすべてⅨ「土のけしき・土のふしぎ」

    2009/03/10 - 2009/04/05

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    総合学術博物館・東北大学大学院農学研究科・仙台市科学館共催の企画展「東北大学総合学術博物館のすべてⅨ 土のけしき・土のふしぎ」が、仙台市科学館エントランスホールを会場として、2009年3月10日から4月5日まで開催されました。

  12. 企画展 東北大学総合学術博物館のすべて Ⅷ 「中国・朝鮮国境の大活火山 白頭山の謎」

    2008/10/07 - 2008/10/26

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    2008年10月7日から26日までの20日間、東北大学東北アジア研究センターならびに仙台市科学館との主催で、仙台市科学館3階エントランスホールを会場に企画展「中国・朝鮮国境の大活火山 白頭山の謎」を開催しました。

  13. ミュージアムトーク2008

    2008/02/16 - 2008/03/15

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    総合学術博物館では、平成19年度公開講座として、平成20年2月16日から3月15日までの毎週土曜日に、東北大学自然史標本館において、「ミュージアムトーク2008 ロック アンド フォッシル」を開催しました。今回の公開講座では、展示中の岩石や化石標本を間近に見ながら、その由来や学術的な履歴について語ることを主旨として、ミュージアムトークという型式をとりました。講演者と受講者との距離を近く感じてもらうために、少人数での開催を企画しましたが、いずれの回も募集人数を上回る応募があり、お申し込みをお断りさせていただくこともございました。

  14. 「東北大学の至宝-資料が語る1世紀」展 (仙台市博物館)

    2007/11/02 - 2007/12/09

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    東北大学創立100周年記念行事の一環として、表記の企画展が江戸東京博物館(2007年9月1日~10月14日)および仙台市博物館(11月2日~12月9日)で開催されました。展示に加えて、江戸東京博物館では5回の講演会と7回のコーナーごとのフロアトーク、仙台市博物館では4回の講演会、6回のミュージアムトーク、記念イベント(「東北大学テクノワンダーランドへようこそ!-体験と展示-」「サイエンスエンジェルの体験科学広場」)など多彩な関連イベントも実施されました。期間中の来場者は、江戸博会場3万3千人、仙台市博1万2千人でした。

  15. 資料標本類が語る東北大学理学部100年の記憶

    2007/07/24 - 2007/12/09

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    自然史標本館では、総合学術博物館と協力し、「資料標本類が語る東北大学理学部100年の記憶」と題するサイエンス展示を、7月下旬より12月まで開催します。この展示では、自然史標本館の常設展示の一部をリニューアルするとともに、ミニ展示コーナーその他を用いて、脊椎動物、有孔虫、鉱物学、南方研究など、自然史関係を中心とする分野で東北大学創世期・発展期に活躍された研究者とその研究成果を紹介するとともに、研究教育に用いられた機器を展示し、理学部100年の研究の歴史をふりかえります。

  16. 企画展 東北大学総合学術博物館のすべて Ⅶ 「大学・職人の街-100年の研究を支える匠の技術-」

    2007/10/12 - 2007/10/28

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    10月12日から10月28日までの17日間、仙台市科学館3階エントランスホールを会場として、企画展「大学・職人の街―100年の研究を支える匠の技術―」を開催しました。

  17. 「東北大学の至宝-資料が語る1世紀」展 (江戸東京博物館)

    2007/09/01 - 2007/10/14

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    東北大学創立100周年記念行事の一環として、表記の企画展が江戸東京博物館(2007年9月1日~10月14日)および仙台市博物館(11月2日~12月9日)で開催されました。展示に加えて、江戸東京博物館では5回の講演会と7回のコーナーごとのフロアトーク、仙台市博物館では4回の講演会、6回のミュージアムトーク、記念イベント(「東北大学テクノワンダーランドへようこそ!-体験と展示-」「サイエンスエンジェルの体験科学広場」)など多彩な関連イベントも実施されました。期間中の来場者は、江戸博会場3万3千人、仙台市博1万2千人でした。

  18. 企画展 東北大学総合学術博物館のすべてⅥ「脳のかたち 心のちず」展示ブース作成

    2007/02/06 - 2007/03/04

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    2月6日から3月4日での27日間、仙台市科学館3階エントランスホールを会場として企画展「脳のかたち、心のちず」を開催しました。

  19. 企画展 東北大学総合学術博物館のすべて Ⅴ 「発祥の地 東北の情報エレクトロニクス・リサーチ 歴史と最先端 そして夢」

    2006/09/26 - 2006/10/06

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    東北大学の学術標本や研究成果を広く公開する企画展シリーズの第5回目で、これら東北大学の情報エレクトロニクス研究の歴史と最先端研究およびそのめざす夢を紹介しました。展示では、上記の研究の歴史を、八木・宇田アンテナや初期のハードディスク、現在研究中の電気自動車等の展示を加えて示した上で、現在この分野でどのような研究が行われているかを、30の研究室ごとに紹介しました。内容が多岐にわたるものであったので、各会場ともパネル展示は前半・後半で15テーマずつの入れ替えを行いました。10月6日には、梅原仙台市長が展示会場に見え、主催者のひとり海老澤丕道教授の案内で見学されました。

  20. かたちのふしぎ研究グループ主催「鉱物にはなぜかたちがあるのだろう」

    2005/08/03 - 2005/08/04

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    鉱物の「かたち」を話題の中心にして、鉱物の種類によるかたちのちがいや、同じ鉱物でのかたちの変化、そして、割れた鉱物のかたちなどについての不思議さを体験しました。2日間の体験活動では、第1日目に野外での鉱物採集を行い、第2日目には採集した鉱物を種類分けして、標本箱を作成、また鉱物の割れ方についての室内実習を行いました。おもに仙台市内の小学生~中学生の30名が参加して、夏休みの企画を楽しみました。

  21. 企画展 東北大学総合学術博物館のすべて Ⅲ 「東北のマテリアル・リサーチ」

    2005/02/01 - 2005/02/19

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    「東北電力グリ-ンプラザおよび21世紀COEプログラム物質創製・材料化国際研究教育拠点との共催で、企画展「東北のマテリアル・リサーチ」を東北電力グリーンプラザで開催しました。今年度は本多光太郎博士の没後50周年の節目にあたります。世界の材料科学の歴史を概観し、博士の偉業を受け継ぐ最新の研究成果を、標本の展示と解説パネルで紹介しました。また、これらの内容をまとめたパンフレットを来場者に配布しました。19日までの期間の来場者の総数は40、000人をこえています(センサーによる推定)。

  22. 「白頭山」巡回展(阿蘇火山博物館)

    2010/12/10 -

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    12月11日(土)より、博物館企画展示室において、「白頭山展」を開催。北朝鮮と中国との国境に位置するこの火山は、10世紀に大規模な噴火を起こし、日本にも火山灰を降らせました。東北大学を中心に実施された調査研究の成果を、企画展示として巡回。

  23. 社団法人 日本セラミックス協会見学会案内

    2010/11/26 -

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    当協会、資源・環境関連材料部会では、材料関連の情報収集、情報交換のために、毎年秋に、関係企業・研究機関の見学会を実施している。今回は、独立行政法人産業技術総合研究所東北センターのコンソーシアム「Clayteam」と共催で、東北地区の見学会を企画した。、鉱物資料を豊富に展示されている貴大学総合学術博物館を見学し知見を深める。

  24. 武蔵高等学校中学校地学部石川合宿案内

    2010/08/04 -

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    武蔵高等学校中学校地学部石川合宿案内

  25. 宮城県高等学校理科研究会地学部会秋季総会ならびに研修会にて講演

    2003/11/13 -

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    宮城県高等学校理科研究会地学部会秋季総会ならびに研修会にて講演,11月13日,宮城県白石市.

  26. 鉱物学会・東北大学総合学術博物館一般普及講演会「鉱物の魅力」ならびに博物館体験ツアー

    2003/09/28 -

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    鉱物学会・東北大学総合学術博物館一般普及講演会「鉱物の魅力」ならびに博物館体験ツアーを主催,9月28日,仙台市戦災復興記念館.

  27. 大学博物館体験学習活動「かたちの不思議」にて実習指導

    2003/08/02 -

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    第2日目の午前中は、形の記録方法を学ぶために、石器や貝殻などのスケッチ法と計測方法の実習を行いました。午後は、鉱物の形がどんな風にできているかを知るために、ダイヤモンドとグラファイトの原子模型を作成し、同じ炭素という元素から構成されていても結晶構造が異なると出来上がる形や性質がまったく異なる鉱物となることを学びました。さらに、午後の後半では、地形の特徴を地形図から読み取ることにチャレンジしました。

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Media Coverage 8

  1. 日立鉱山で新鉱物発見 東北大など 「材料開発の可能性」

    茨城新聞

    2019/08

    Type: Newspaper, magazine

  2. 新鉱物「日立鉱」発見 材料開発の応用に期待 東北大などのグループ

    河北新報

    2019/08

    Type: Newspaper, magazine

  3. 東北大と海洋研究開発機構など,日本最古の茨城県日立鉱山不動滝鉱床から新鉱物を発見.

    日本経済新聞

    2019/08

    Type: Newspaper, magazine

  4. 「日本の石」ヒスイ 77年前の業績に光

    河北新聞

    2016/10

    Type: Newspaper, magazine

  5. 海洋研究開発機構など 沖縄沖の人工熱水噴出孔チムニー高濃度有用金属が含有

    日刊工業新聞

    2016/02

    Type: Newspaper, magazine

  6. 海洋研究開発機構 海底掘削熱水から鉱石回収 沖縄深海 金・銀を「養殖」

    朝日新聞

    2016/02

    Type: Newspaper, magazine

  7. 結晶に天然ガス含む新鉱物発見/「千葉石」と命名

    四国新聞

    2013/02

    Type: Newspaper, magazine

  8. 結晶内にメタン,「千葉石」を発見 物材機構など

    日本経済新聞

    2013/02

    Type: Newspaper, magazine

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