Melting temperature of Fe-light elements system at Earth's core pressure and the thermal model of the Earth

• Project/Area Number: 19840007
• Research Category: Grant-in-Aid for Young Scientists (Start-up)
• Allocation Type: Single-year Grants
• Research Field: Petrology/Mineralogy/Science of ore deposit
• Research Institution: Tohoku University
• Principal Investigator: SAKAI Takeshi Tohoku University, 国際高等研究教育機構, 助教 (90451616)
• Project Period (FY): 2007 – 2008
• Project Status: Completed (Fiscal Year 2008)
• Budget Amount: ¥3,105,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥405,000); Fiscal Year 2008: ¥1,755,000 (Direct Cost: ¥1,350,000、Indirect Cost: ¥405,000); Fiscal Year 2007: ¥1,350,000 (Direct Cost: ¥1,350,000)
• Keywords: 高温高圧 / 地球中心核 / 結晶構造

Research Abstract

地球の核に相当する数100万気圧での実験を可能にするために集束イオンビーム加工機を利用した技術開発を行った。この技術を用いて核を構成する鉄-軽元素系合金について地球中心圧力を超える373 GPaまでの実験に成功し、極限状態での結晶構造、密度、圧縮率といった物性を測定した。またマントル鉱物間の鉄-マグネシウム元素分配関係について圧力依存性および組成依存性をマントル最下部条件まで明らかにした。

Research Products

• [Journal Article] Fe-Mg partitioning between perovskite and ferropericlase at the lower mantle (2009)
  • Author(s): Sakai, T., Ohtani, E., Terasaki, H., Sawada, N., Kobayashi, Y., Miyahara, M., Nishijima, M., Hirao, N., Ohishi, Y., Kikegawa, T.
  • Journal Title: Am. Mineral. (IN PRESS)
  • Peer Reviewed
• [Journal Article] Fe-Mg partitioning between perovskite and ferropericlas e at the lower mantle (2009)
  • Author(s): Sakai, T., Ohtani, E., T erasaki, H., Sawada, N., Kobayashi, Y., Miyahara, M., Nishijima, M., Hir ao, N., Ohishi, Y., Kike gawa, T.
  • Journal Title: American Mineralogist (In press)
  • Peer Reviewed
• [Journal Article] Recent advances in the study of mantle phase transitions. Phys. Earth Planet (2008)
  • Author(s): Ohtani, E. and Sakai, T.
  • Journal Title: Int. 170 Pages: 240-247
  • Peer Reviewed
• [Journal Article] Phase relations of Fe-Si alloy up to core conditions : Implications for the Earth inner core. (2008)
  • Author(s): Asanuma, H., Ohtani, E., Sakai, T., Terasaki, H., Kamada, S., Hirao, N., Sata, N., Ohishi, Y.
  • Journal Title: Geophys. Res. Lett. 35
  • Peer Reviewed
• [Journal Article] Phase relation of Fe-Ni-S ternary system at the core pressure and temperature. (2008)
  • Author(s): Sakai, T., Kamada, S., Terasaki, H., Ohtani, E., Hidetoshi, A., Hirao, N.
  • Journal Title: SPring-8 User Experimental Report
• [Journal Article] Study of high pressure phases of iron-nickel-silicon alloy at Multi-mega bar pressure and high temperature (2008)
  • Author(s): Ohtani, E., Asanuma, H., Terasaki, H., Sakai, T., Kamada, S., Sawada, N., Kondo, T., Hirao, N.
  • Journal Title: SPring-8 User Experimental Report
• [Journal Article] Melting temperature and the crystal structure of Fe-Ni-S system at multi-megabar pressure (2008)
  • Author(s): Sakai, T., Kamada, S., Terasaki, H., Ohtani, E., Murakami, M., Hidetoshi, A., Hirao, N.
  • Journal Title: SPring-8 User Experimental Report
• [Journal Article] The application of FIB system to ultra-high pressure Earth science (2008)
  • Author(s): Miyahara, M., Sakai, T., Ohtani, E., Kobayashi, Y., Kamada, S., Kondo, T., Nagase, T., Yoo, J-H., Nishijima M., and Vashaei, Z.
  • Journal Title: The Journal of Mineralogical and Petrological Sciences 103 Pages: 88-93
  • NAID: 10020736990
  • Peer Reviewed
• [Journal Article] FIB法によるDAC試料のTEM薄膜試料作製 (2008)
  • Author(s): 境毅
  • Journal Title: 高圧力の科学と技術 18 Pages: 38-43
  • NAID: 10021153261
  • Peer Reviewed
• [Journal Article] FIB法によるDAC試料のTEM薄片試料作成 (2008)
  • Author(s): 境 毅
  • Journal Title: 高圧力の科学と技術 18 Pages: 38-43
  • Peer Reviewed
• [Presentation] Mg-Fe Partitioning between lower mantle minerals and their spin transitions (2008)
  • Author(s): Ohtani, E., Sakai, T.
  • Organizer: American Geophysical Union (AGU) Fall meeting, MR23A-01
  • Place of Presentation: Moscone Convention Center, San Francisco, California, USA(INVITED)
• [Presentation] Phase stability of (Fe,Ni)3S at the core pressure conditions (2008)
  • Author(s): Sakai, T., Kamada, S., Terasaki, H., Ohtani, E., Hirao, N., Asanuma, H., Sata, N., Ohishi, Y.
  • Organizer: conditions. American Geophysical Union (AGU) Fall meeting, MR41A-1782
  • Place of Presentation: Moscone Convention Center, San Francisco, California, USA
• [Presentation] Phase and Melting Relations of Fe-S System up to the Outer Core Conditions (2008)
  • Author(s): Kamada, S., Terasaki, H., Sakai, T., Ohtani, E., Miyahara, M., Asanuma, H., Hayashi, H., Kikegawa, T., Ohishi, Y., Hirao, N., Sata, N.
  • Organizer: American Geophysical Union (AGU) Fall meeting, MR41A-1783
  • Place of Presentation: Moscone Convention Center, San Francisco, California, USA
• [Presentation] Phase relations of Fe-Si alloy up to core conditions : Implications for the Earth inner core. (2008)
  • Author(s): Asanuma, H., Ohtani, E., Sakai, T., Terasaki, H., Kamada, S., Hirao, N., Sata, N., Ohishi, Y.
  • Organizer: American Geophysical Union (AGU) Fall meeting, MR41A-1784
  • Place of Presentation: Moscone Convention Center, San Francisco, California, USA
• [Presentation] マルチメガバール領域での(Fe,Ni)3S構造安定性 (2008)
  • Author(s): 境毅, 鎌田誠司, 大谷栄治, 寺崎英紀, 宮原正明, 西嶋雅彦, 平尾直久, 佐多永吉, 大石泰生
  • Organizer: 第49回高圧討論会, 3B03
  • Place of Presentation: 姫路市, 姫路商工会議所
• [Presentation] 地球核条件までの鉄-硫黄系の相平衡と融解関係 (2008)
  • Author(s): 鎌田誠司, 寺崎英紀, 境毅, 大谷栄治, 宮原正明, 淺沼英利, 亀卦川卓美, 大石泰生, 平尾直久, 佐多永吉
  • Organizer: 第49回高圧討論会3B02
  • Place of Presentation: 姫路市, 姫路商工会議所
• [Presentation] Phase relations of Fe-Si alloy up to core conditions (2008)
  • Author(s): Asanuma, H., Ohtani, E., Sakai, T., Terasaki, T., Kamada, S., Hirao, N., Sata, N., Ohishi, Y.
  • Organizer: 日本地球惑星科学連合2008年大会, I128-015
  • Place of Presentation: 幕張メッセ 国際会議場、千葉市
• [Presentation] Phase relation of Fe-FeS system under the core conditions (2008)
  • Author(s): Kamada, S., Terasaki, H., Ohtani, E., Sakai, T., Kikegawa, T., Ohishi, Y., Hirao, N., Sata, N.
  • Organizer: 日本地球惑星科学連合2008年大会, I128-016
  • Place of Presentation: 幕張メッセ 国際会議場、千葉市
• [Presentation] Phase stability of (Fe, Ni)_3S at the core pressure conditions (2008)
  • Author(s): Sakai, T., Kamada, S., Teras aki, H., Ohtani, E., Hirao, N., Asanuma, H., Sata, N., Ohishi, Y.
  • Organizer: American Geophysical Union (AGU) Fall meeting
  • Place of Presentation: Moscone Convention Center, San Francisco, Cali fornia, USA
• [Presentation] マルチメガバール領域での(Fe,Ni)_3S構造安定性 (2008)
  • Author(s): 境毅, 鎌田誠司, 大谷栄治, 寺崎英紀, 宮原正明, 西嶋雅彦, 平尾直久, 佐多永吉, 大石泰生
  • Organizer: 第49回高圧討論会
  • Place of Presentation: 姫路市, 姫路商工会議所
• [Presentation] Fe-Mg partitioning between perovskite, post-perovskite, and ferropericlase at the lowermost mantle (2007)
  • Author(s): Sakai T., Ohtani E., Miyahara M., Nishijima M., Terasaki H., Kondo T., Kikegawa T., Hirao N. , Ohishi Y.
  • Organizer: American Geophysical Union (AGU) Fall meeting, MR31B-0365
  • Place of Presentation: Moscone West and Moscone South, San Francisco, California, USA
• [Presentation] Melting curve of iron-silicon alloy to the core-mantle boundary pressure and the thermal structure of the Earth's core (2007)
  • Author(s): Asanuma, H., Ohtani, E., Sakai, T., Terasaki, H., Kamada, S., Kondo, T., Kikegawa, T.
  • Organizer: American Geophysical Union (AGU) Fall meeting, MR31B-0369
  • Place of Presentation: Moscone West and Moscone South, San Francisco, California, USA,
• [Presentation] Partitioning of iron between perovskite, post-perovskite, and ferropericlase up to 154 GPa and 2000 K (2007)
  • Author(s): Sakai, T., Ohtani, E., Miyahara, M., Nishijima, M., Terasaki, H., Kondo, T., Kikegawa, T., Hirao, N., Ohishi, Y.
  • Organizer: International workshop on Synchrotron high-pressure mineral physics and materials science, The Advanced photon Source
  • Place of Presentation: Argonne National Laboratory, Argonne, Illinois USA
• [Presentation] マントル最下部における珪酸塩-酸化物間のFe-Mg分配関係 (2007)
  • Author(s): 西嶋雅彦, 亀卦川卓美, 平尾直久, 佐多永吉, 大石泰生
  • Organizer: 第48回高圧討論会, 3P40
  • Place of Presentation: 倉吉市, 倉吉パークスクエア
• [Presentation] 鉄-硫黄系の高温高圧下におけるサブソリダス相 (2007)
  • Author(s): 鎌田誠司, 寺崎英紀, 境毅, 大谷栄治, 亀卦川卓美, 大石泰生, 平尾直久, 佐多永吉
  • Organizer: 第48回高圧討論会, 1P32
  • Place of Presentation: 倉吉市, 倉吉パークスクエア
• [Presentation] The application of a FIB-TEM/STEM work to the earth and planetary science (2007)
  • Author(s): Miyahara, M., Sakai, T., Ohtani, E., Uehara, S., El Goresy, A., Kamada, S., Kondo, T., Nagase, T., Nishijima, M., Vashaei, Z., Yoo, J.H., Kitagawa, R.
  • Organizer: The 21st Century COE [Earth Science] International Symposium "Dynamic Earth: its origin and future", SD-P02
  • Place of Presentation: Sendai city war reconstruction memorial hall, Sendai, Japan
• [Presentation] ポストペロブスカイトとフェロペリクレ-スの元素分配-マントル最下部の構造への適用(Element partitioning between post-perovskite and ferropericlase and implication to the lowermost mantle structure) (2007)
  • Author(s): 境毅, 大谷栄治, 宮原正明, 西嶋雅彦, 近藤忠, 亀卦川卓美
  • Organizer: 日本地球惑星科学連合2007年大会, I128-015
  • Place of Presentation: 幕張メッセ 国際会議場、千葉市
• [Presentation] The FIB milling of LHDAC sample for TEM, EMPA and SEM analyses (2007)
  • Author(s): 境毅, 大谷栄治, 寺崎英紀, 宮原正明, 境毅, 大谷栄治, 小林祐介, 鎌田誠司, 近藤忠, 西嶋雅彦, 長瀬敏郎
  • Organizer: 日本地球惑星科学連合2007年大会, I128-P025
  • Place of Presentation: 幕張メッセ 国際会議場、千葉市
• [Presentation] The application of FIB system to high-pressure earth science (2007)
  • Author(s): Miyahara, M., Sakai, T., Ohtani, E., Kobayashi, Y., Kamada, S., Kondo, T., El Goresy, A., Nagase, T., Yoo, J.-H., Masahiko, N., Vashaei, Z.
  • Organizer: 7th High Pressure Mineral Physics Seminar, P1-29
  • Place of Presentation: Matsushima, Japan
• [Presentation] Melting curve of Fe-Si alloy up to core-mantle boundary pressure (2007)
  • Author(s): Asanuma, H., Ohtani, E., Sakai, T., Kamada, S., Terasaki, H., Kondo, T., Kikegawa, T.
  • Organizer: 7th High Pressure Mineral Physics Seminar, P2-24
  • Place of Presentation: Matsushima, Japan
• [Presentation] マントル最下部における珪酸塩・酸化物間のFe-Mg分配関係 (2007)
  • Author(s): 境 毅
  • Organizer: 第48回高圧討論会
  • Place of Presentation: 倉吉市,倉吉パークスクエア
• [Presentation] Partitioning of iron between perovskite, post-perovskite, and ferropericla se up to 154 GPa and 2000 K (2007)
  • Author(s): 境 毅
  • Organizer: International workshop on Synchrotron high-press ure mineral physics and materials science
  • Place of Presentation: The Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois USA
• [Presentation] Fe-Mg partitioning between perovskite, post-perovskite, and ferropericlase at the lowermost mantle (2007)
  • Author(s): 境 毅
  • Organizer: American Geophysical Union (AGU) Fall meeting
  • Place of Presentation: Moscone West and Moscone South, San Francisco, California, USA