Construction of the universal pressure scale to the Earth's core

2022 Fiscal Year Annual Research Report

• Project/Area Number: 20H00187
• Research Institution: Tohoku University
• Principal Investigator: 大谷 栄治 東北大学, 理学研究科, 客員研究者 (60136306)
• Co-Investigator(Kenkyū-buntansha): 坂巻 竜也 東北大学, 理学研究科, 助教 (30630769) ; 福井 宏之 公益財団法人高輝度光科学研究センター, 精密分光推進室, テニュアトラック研究員 (90397901) ; 宮原 正明 広島大学, 先進理工系科学研究科(理), 准教授 (90400241) ; Alfred Baron 国立研究開発法人理化学研究所, 放射光科学研究センター, グループディレクター (90442920)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 圧力スケール / 地球核 / X線非弾性散乱 / 弾性波速度 / 密度 / レニウム / 高圧

Outline of Annual Research Achievements

高圧下におけるX線非弾性散乱実験および粉末X線回折実験によって，六方最密充填構造をもつ金属レニウムの縦波速度，横波速度と密度の同時測定を室温において行った．金属レニウムについて，230 GPaまでの圧力条件で，X線非弾性散乱法によって縦波，横波を決定し，密度については，粉末X線回折法を用いて決定することができた．得られた結果を用いて室温における一次圧力スケールの構築を試みた．今回の測定では，理想的な金属レニウム結晶において理論的に期待されるよりも非常に強い非弾性散乱の横波モードが測定された．この強い横波モードの原因を解明するために，常圧において変形した金属レニウム結晶のX線非弾性散乱実験をおこなうとともに，第一原理計算を行い，結晶の変形組織が非弾性散乱ピークに与える影響を明らかにし，今回の大きな横波のモードの測定結果と矛盾しない計算結果を得ることができた．この結果にもとづいて，金属レニウムによる絶対圧力スケールを決定した．そして，その結果を論文として取りまとめ，国際誌(Science Advances)に投稿し，受理・出版された．さらに，鉄-ニッケル-ケイ素合金の音速測定を高温高圧下において行っている．

Research Progress Status

令和4年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和4年度が最終年度であるため、記入しない。

Research Products

• [Int'l Joint Research] Karlsruhe Institute of Technology(ドイツ)
  • Country Name: GERMANY
  • Counterpart Institution: Karlsruhe Institute of Technology
• [Int'l Joint Research] University of Bayreuth(ドイツ)
  • Country Name: GERMANY
  • Counterpart Institution: University of Bayreuth
• [Journal Article] Hydrogen partitioning between stishovite and hydrous phase δ: implications for water cycle and distribution in the lower mantle (2024)
  • Author(s): T Ishii, G Criniti, N Purevjav, T Katsura, E Ohtani
  • Journal Title: Progress in Earth and Planetary Science Volume: 11 Pages: 1-9
  • DOI: 10.1186/s40645-024-00615-0
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Deuterium content and site occupancy in iron sulfide at high pressure and temperature determined using in situ neutron diffraction measurements (2023)
  • Author(s): Sumith Abeykoon, Christopher Howard, Serena Dominijanni, Lisa Eberhard, Alexander Kurnosov, Daniel J Frost, Tiziana Boffa Ballaran, Hidenori Terasaki, Tatsuya Sakamaki, Akio Suzuki, Eiji Ohtani, Asami Sano‐Furukawa, Jun Abe
  • Journal Title: Journal of Geophysical Research: Solid Earth Volume: 128 Pages: e2023JB026710
  • DOI: 10.1029/2023JB026710
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Mn-Precipitates Found in a Martian Crustal Rock (2023)
  • Author(s): A Nakamura, M Miyahara, H Suga, A Yamaguchi, D Wakabayashi, S Yamashita, Y Takeichi, K Kukihara, Y Takahashi, E Ohtani
  • Journal Title: Journal of Geophysical Research: Planets Volume: 128 Pages: e2023JE007951
  • DOI: 10.1029/2023JE007951
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Density deficit of Earth’s core revealed by a multimegabar primary pressure scale (2023)
  • Author(s): D Ikuta, E Ohtani, H Fukui, T Sakamaki, R Heid, D Ishikawa, AQR Baron
  • Journal Title: Science advances Volume: 9 Pages: eadh8706
  • DOI: 10.1126/sciadv.adh870
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Aluminum and hydrogen partitioning between bridgmanite and high-pressure hydrous phases: Implications for water storage in the lower mantle (2022)
  • Author(s): T. Ishii, E. Ohtani, A. Shatskiy
  • Journal Title: Earth and Planetary Science Letters Volume: 538 Pages: 117441
  • DOI: 10.1016/j.epsl.2022.117441
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] High pressure melts (2022)
  • Author(s): T Sakamaki, E Ohtani,
  • Journal Title: Reviews in Mineralogy and Geochemistry Volume: 87 Pages: 557-574
  • DOI: 10.2138/rmg.2022.87.11
  • Peer Reviewed / Open Access
• [Journal Article] Experimental simulations of shock textures in BCC iron: implications for iron meteorites (2022)
  • Author(s): E Ohtani, T Sakurabayashi, K Kurosawa
  • Journal Title: Progress in Earth and Planetary Science Volume: 9 Pages: 24
  • DOI: 10.1186/s40645-022-00482-7
• [Journal Article] Low Thermal Conductivity of Hydrous Phase D Leads to a Self‐Preservation Effect Within a Subducting Slab (2022)
  • Author(s): Wen-Pin Hsieh, Enrico Marzotto, Takayuki Ishii, Leonid Dubrovinsky, Alena A Aslandukova, Giacomo Criniti, Yi‐Chi Tsao, Chun‐Hung Lin, Jun Tsuchiya, Eiji Ohtani
  • Journal Title: Journal of Geophysical Research: Solid Earth Volume: 127 Pages: e2022JB024556
  • DOI: 10.1029/2022JB024556
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Sound Velocity Measurements of B2‐Fe‐Ni‐Si Alloy Under High Pressure by Inelastic X‐Ray Scattering: Implications for the Composition of Earth's Core (2022)
  • Author(s): S Dominijanni, CA McCammon, E Ohtani, D Ikuta, T Sakamaki, T Ishii, G Criniti, LS Dubrovinsky, S Khandarkhaeva, T Fedotenko, K Glazyrin, H Uchiyama, H Fukui
  • Journal Title: Geophysical Research Letters Volume: 49 Pages: e2021GL096405
  • DOI: 10.1029/2021GL096405
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Formation of an Al‐Rich Niccolite‐Type Silica in Subducted Oceanic Crust: Implications for Water Transport to the Deep Lower Mantle (2022)
  • Author(s): Lu Liu, Hongsheng Yuan, Yao Yao, Ziqiang Yang, Federico Aiace Gorelli, Nico Giordano, Lixin He, Eiji Ohtani, Li Zhang
  • Journal Title: Geophysical Research Letters Volume: 49 Pages: e2021GL097178
  • DOI: 10.1029/2021GL097178
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Apollo 15 regolith breccia provides first natural evidence for olivine incongruent melting (2022)
  • Author(s): N Satta, M Miyahara, S Ozawa, H Marquardt, M Nishijima, T Arai, E Ohtani
  • Journal Title: American Mineralogist Volume: 107 Pages: 661-1667
  • DOI: 10.2138/am-2022-8121
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Superhydrous aluminous silica phases as major water hosts in high-temperature lower mantle (2022)
  • Author(s): T Ishii, G Criniti, E Ohtani, N Purevjav, H Fei, T Katsura, H Mao
  • Journal Title: Proceedings of the National Academy of Sciences Volume: 119 Pages: e2211243119
  • DOI: 10.1073/pnas.2211243119
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Journal Article] Sound velocity of hexagonal close-packed iron to the Earth’s inner core pressure (2022)
  • Author(s): D Ikuta, E Ohtani, H Fukui, T Sakai, D Ishikawa, AQR Baron
  • Journal Title: Nature Communications Volume: 13 Pages: 7211
  • DOI: 10.1038/s41467-022-34789-2
  • Peer Reviewed / Open Access
• [Journal Article] Preface for article collection “Thermal, dynamical, and chemical processes in our early Solar System” (2022)
  • Author(s): A Bouvier, M Kimura, Y Lin, E Ohtani, T Sharp
  • Journal Title: Progress in Earth and Planetary Science Volume: 9 Pages: 1-3
  • DOI: 10.1186/s40645-022-00522-2
  • Peer Reviewed / Open Access / Int'l Joint Research
• [Presentation] 地球内部における加水・脱水反応と地球の水素量：三宅泰雄先生の研究との接点（三宅賞レクチャー） (2023)
  • Author(s): 大谷栄治
  • Organizer: JpGU2023 Meeting
  • Int'l Joint Research / Invited
• [Presentation] High temperature separation of the oxygen-rich big Martian core (2023)
  • Author(s): Eiji Ohtani, William F McDonough
  • Organizer: JpGU2023
  • Int'l Joint Research
• [Presentation] Role of water in dynamics of slabs and surrounding mantle (2023)
  • Author(s): 大谷 栄治，Ishii Takayuki
  • Organizer: JpGU2023
  • Int'l Joint Research
• [Presentation] Water solubility of aluminous stishovite coexisting with hydrous phase δ: Implication for water cycle in the lower mantle (2023)
  • Author(s): 石井 貴之，大谷 栄治
  • Organizer: JpGU2023
  • Int'l Joint Research
• [Presentation] Sound velocity measurement of B2 Fe-Ni-Si alloys at high pressure and high temperature (2023)
  • Author(s): 生田大穣，大谷栄治，福井宏之，坂巻竜也，増野いづみ，石川大介，バロン アルフレッド
  • Organizer: JpGU2023
  • Int'l Joint Research
• [Presentation] 高温における酸素に富む火星核の形成過程 (2023)
  • Author(s): 大谷 栄治, マクドノア ウイリアム
  • Organizer: 日本鉱物科学会
• [Presentation] Hydrous aluminous silicas as major water hosts in the lower mantle (2023)
  • Author(s): T Katsura, T Ishii, G Criniti, E Ohtani, N Purevjav, H Fei, H Mao
  • Organizer: EGU23
  • Int'l Joint Research
• [Presentation] The role of Water in the Dynamics of Slabs and surrounding Mantle (2023)
  • Author(s): Eiji Ohtani
  • Organizer: Bjorn Mysen’s retirement Symposium, Carnegie Institution
  • Int'l Joint Research / Invited
• [Presentation] Water solubility of aluminous silicas at lower mantle conditions and their implication for water cycle in the deep mantle (2023)
  • Author(s): Ishii T, Criniti G, Ohtani E, Fei H, Prevjav N, Mao H, Katsura T.
  • Organizer: AGU23
  • Int'l Joint Research
• [Presentation] Water solubility of aluminous post-stishovite at top lower mantle conditions: Implications for water cycle in the deep mantle (2022)
  • Author(s): Takayuki Ishii, Giacomo Criniti, Eiji Ohtani et al
  • Organizer: JpGU Meeting 2022
  • Int'l Joint Research / Invited
• [Presentation] Aluminum and hydrogen partitioning between bridgmanite and high-pressure hydrous phases and its application to the lower mantle dynamics (2022)
  • Author(s): Eiji Ohtani, Takayuki Ishii, Anton Shatskiy
  • Organizer: JpGU Meeting 2022
  • Int'l Joint Research
• [Presentation] Sound velocity of hcp-iron to the Earth's inner core pressure: Implication for light elements in the core (2022)
  • Author(s): Daijo Ikuta, Eiji Ohtani et al.
  • Organizer: JpGU Meeting 2022
  • Int'l Joint Research
• [Presentation] Density deficit of the inner core revealed by a new rhenium primary pressure scale (2022)
  • Author(s): 大谷栄治，生田 大穣， 福井 宏之，石川 大介，バロン アルフレッド
  • Organizer: JpGU Meeting 2022
  • Int'l Joint Research
• [Presentation] 酸素とイオウに富んだ火星の核と火星核のダイナモ (2022)
  • Author(s): 大谷 栄治, McDonough William, 吉崎 昂
  • Organizer: JpGU Meeting 2022
  • Int'l Joint Research
• [Presentation] Sound velocity of hcp-iron to the inner core pressure, and light elements in the inner core (2022)
  • Author(s): 生田 大穣、大谷 栄治 福井 宏之，境 毅，石川 大介，バロン アルフレッド
  • Organizer: 日本鉱物科学会
• [Presentation] 含水鉱物と共存するブリッジマナイトの水素とアルミナ枯渇と地球内部ダイナミクス (2022)
  • Author(s): 大谷 栄治，石井 貴之
  • Organizer: 日本鉱物科学会
• [Presentation] 超高圧下における X 線非弾性散乱法による鉄合金およびレニウム の音速測定とその地球内部への適用 (2022)
  • Author(s): 大谷 栄治 ・ 生田 大穣 ・ 福井 宏 ・ 坂巻 竜也 ・ 増野 いづみ ・ 境 毅 ・ 石川 大輔 ・ BARON Alfred
  • Organizer: 第63回高圧討論会
  • Invited
• [Presentation] Sound velocity measurement of hcp-iron to the Earth's inner core pressure: Implications for light elements in the inner core (2022)
  • Author(s): 生田 大穣・大谷 栄治・福井 宏之・境 毅・ 石川 大介 ・ BARON Alfred Q. R.
  • Organizer: 第63回高圧討論会
• [Presentation] A self-protection mechanism by the hydration reduced thermal conductivity of hydrous minerals (2022)
  • Author(s): Wen-Pin Hsieh, Enrico Marzotto, Takayuki Ishii, Leonid S Dubrovinsky, Alena Aslandukova, Giacomo Criniti, Yi-Chi Tsao, Chun-Hung Lin, Jun Tsuchiya, Eiji Ohtani
  • Organizer: AGU Fall Meeting 2022
  • Int'l Joint Research
• [Presentation] Elucidation of aqueous alteration in the lava units with nakhlites NWA 10153 and NWA 6148 (2022)
  • Author(s): Kakeru Kukihara, Masaaki Miyahara, Akira Yamaguchi, Yoshio Takahashi, Yasuo Takeichi, Naotaka Tomioka, Eiji Ohtani
  • Organizer: NIPR symposium 2022
• [Book] Static and Dynamic High Pressure Mineral Physics (2022)
  • Author(s): Y Fei, M Walter, J Badro, K Hirose, OT Lord, A Campbell, E Ohtani
  • Total Pages: 410
  • Publisher: Cambridge University Press
  • ISBN: 9781108806145
• [Remarks] 放射光X線が地球核の化学組成を変える －新しい絶対圧力スケールを決定－
  • URL: https://www.riken.jp/press/2023/20230922_1/index.html
• [Remarks] 放射光X線が地球核の化学組成を変える －新しい絶対圧力スケールを決定－
  • URL: https://www.tohoku.ac.jp/japanese/2023/09/press20230922-03-synchrotron.html
• [Remarks] 300万気圧を超える圧力下で金属鉄の音速測定に成功 ～地球内核の解明に向けた新たな一歩～
  • URL: https://www.tohoku.ac.jp/japanese/2022/11/press20221128-02-earth.html