Development of innovative high-pressure deformation technology toward understanding complicated seismic structure and dynamics of Earth's inner core

• Project/Area Number: 19H00724
• Research Category: Grant-in-Aid for Scientific Research (A)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Medium-sized Section 17:Earth and planetary science and related fields
• Research Institution: Kyoto University
• Principal Investigator: Nomura Ryuichi 京都大学, 白眉センター, 特定准教授 (40734570)
• Co-Investigator(Kenkyū-buntansha): 西原 遊 愛媛大学, 地球深部ダイナミクス研究センター, 教授 (10397036) ; 東 真太郎 東京工業大学, 理学院, 助教 (60771293) ; 上杉 健太朗 公益財団法人高輝度光科学研究センター, 分光推進室, 主席研究員 (80344399)
• Project Period (FY): 2019-04-01 – 2023-03-31
• Project Status: Completed (Fiscal Year 2022)
• Budget Amount: ¥46,670,000 (Direct Cost: ¥35,900,000、Indirect Cost: ¥10,770,000); Fiscal Year 2022: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000); Fiscal Year 2021: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000); Fiscal Year 2020: ¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000); Fiscal Year 2019: ¥28,080,000 (Direct Cost: ¥21,600,000、Indirect Cost: ¥6,480,000)
• Keywords: 高圧力 / 高温度 / 地球深部 / 地球内核 / ダイナミクス / 地震波構造 / 高圧高温変形実験 / 回転式ダイヤモンドアンビル装置

Outline of Research at the Start

我々のグループによって開発・高度化が進められ、現在までに約300GPa、1200 Kにおよぶ超高圧高温環境下での変形実験が可能な回転式ダイヤモンドアンビル装置と放射光X線測定系のさらなる高度化を行い、地球内核圧力温度までの定量的変形実験を可能にする。地球内核を構成する金属鉄の粘性と変形誘起結晶方位選択配向を実験で制約し、内核の複雑な地震波構造の起源とダイナミクスの解明を目指す。

Outline of Final Research Achievements

Technical developments on ultra-high pressure deformation experiments have been achieved toward understanding the dynamics of Earth's inner core.1. development of a rotational diamond anvil cell and high-temperature generation, 2. measurement system of rheological properties: combined X-ray diffraction and X-ray laminography in a synchrotron facility.

Academic Significance and Societal Importance of the Research Achievements

地球の深部は極めて高い圧力と温度が支配しており、文字通りのフロンティアで直接探査が不可能な領域です。このような「直接観る」ことが不可能な世界を理解するため、本課題では特にそのダイナミクスに焦点をあて、地球中心圧力温度環境下での地球物質の変形実験実現を目指し新しい装置を開発しました。

Research Products

• [Journal Article] Visualization of the disordered structure of Fe-Ni Invar alloys by reverse monte carlo calculations (2022)
  • Author(s): Kubo Yusuke、Ishimatsu Naoki、Kitamura Naoto、Kawamura Naomi、Kakizawa Sho、Mizumaki Masaichiro、Nomura Ryuichi、Irifune Tetsuo、Sumiya Hitoshi
  • Journal Title: Frontiers in Materials Volume: 9 Pages: 954110-954110
  • DOI: 10.3389/fmats.2022.954110
  • Peer Reviewed / Open Access
• [Journal Article] Development of Lattice‐Preferred Orientations of MgO Periclase From Strain Rate Controlled Shear Deformation Experiments Under Pressure up to 120?GPa (2022)
  • Author(s): Park Yohan、Azuma Shintaro、Okazaki Keishi、Uesugi Kentaro、Yasutake Masahiro、Nishihara Yu、Nomura Ryuichi
  • Journal Title: Geophysical Research Letters Volume: 49 Issue: 21 Pages: 1-9
  • DOI: 10.1029/2022gl100178
  • Peer Reviewed / Open Access
• [Journal Article] Elongation of Fe-Fe atomic pairs in the Invar alloy Fe65Ni35 (2021)
  • Author(s): Ishimatsu, N., Iwasaki, S., Kousa, M., Kato, S., Nakajima, N., Kitamura, N., Kawamura, N., Mizumaki, M., Kakizawa, S., Nomura, R., Irifune, T. and Sumiya, H.
  • Journal Title: Physical Review B Volume: 103 Issue: 22 Pages: 1-5
  • DOI: 10.1103/physrevb.103.l220102
  • Peer Reviewed
• [Journal Article] Thermodynamical Modeling of Liquid Fe‐Si‐Mg‐O:Molten Magnesium Silicate Release From the Core (2020)
  • Author(s): Helffrich George、Hirose Kei、Nomura Ryuichi
  • Journal Title: Geophysical Research Letters Volume: 47 Issue: 21
  • DOI: 10.1029/2020gl089218
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Studies of Deep Earth Rheology Based on High-Pressure Deformation Experiments Using D111-Type Apparatus (2020)
  • Author(s): 西原 遊, 辻野 典秀, 久保 友明, 山崎 大輔, 土居 峻太, 今村 公裕, 芳野極
  • Journal Title: The Review of High Pressure Science and Technology Volume: 30 Issue: 2 Pages: 78-84
  • DOI: 10.4131/jshpreview.30.78
  • NAID: 130007928833
  • ISSN: 0917-639X, 1348-1940
  • Peer Reviewed / Open Access
• [Journal Article] Element-selective elastic properties of Fe65Ni35 Invar alloy and Fe72Pt28 alloy studied by extended X-ray absorption fine structure (2019)
  • Author(s): Kousa M.、Iwasaki S.、Ishimatsu N.、Kawamura N.、Nomura R.、Kakizawa S.、Mizumaki M.、Sumiya H.、Irifune T.
  • Journal Title: High Pressure Research Volume: 40 Issue: 1 Pages: 130-139
  • DOI: 10.1080/08957959.2019.1702175
  • Peer Reviewed / Open Access
• [Journal Article] Melt-crystal density crossover in a deep magma ocean (2019)
  • Author(s): Caracas, R., Hirose, K., Nomura, R., Ballmer, M.D.
  • Journal Title: Earth and Planetary Science Letters Volume: - Pages: 202-211
  • DOI: 10.1016/j.epsl.2019.03.031
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Melting Phase Relations of KLB-1 Peridotite and Mid-Ocean Ridge Basalt and Gravitational Stabilities of Partical Silicate Melts at the Uppermost Lower Mantle (2019)
  • Author(s): KUWAHARA Hideharu、NOMURA Ryuichi、NAKADA Ryoichi、IRIFUNE Tetsuo
  • Journal Title: The Review of High Pressure Science and Technology Volume: 29 Issue: 2 Pages: 75-85
  • DOI: 10.4131/jshpreview.29.75
  • NAID: 130007680184
  • ISSN: 0917-639X, 1348-1940
  • Peer Reviewed / Open Access
• [Journal Article] Sensitivity of elastic thickness to water in the Martian lithosphere (2019)
  • Author(s): Katayama, I., Matsuoka, Y., Azuma, S.
  • Journal Title: Progress in Earth and Planetary Science Volume: 6 Issue: 1 Pages: 51-51
  • DOI: 10.1186/s40645-019-0298-6
  • Peer Reviewed / Open Access
• [Presentation] Torsional deformation experiments at Mbar pressures toward understanding deep Earth rheology (2020)
  • Author(s): Ryuichi Nomura
  • Organizer: 日本地球惑星科学連合 2020年度連合大会
  • Invited
• [Presentation] 高温高圧下のbcc鉄のレオロジー (2020)
  • Author(s): 西原遊，肥後祐司，丹下慶範
  • Organizer: 第61回高圧討論
• [Presentation] Rheology of bcc-iron at high-pressure and -temprature (2020)
  • Author(s): 西原遊，肥後祐司，丹下慶範
  • Organizer: JpGU-AGU Joint Meeting 2020:Virtual
  • Int'l Joint Research
• [Presentation] Deformation experiments of bridgmanite and ferropericlase; Implication for the strength of the subducted slab in the lower mantle. (2019)
  • Author(s): S. Azuma, R. Nomura, K. Uesugi, Y. Nishihara, T. Arimoto
  • Organizer: American Geophysical Union Fall Meeting
  • Int'l Joint Research
• [Presentation] 下部マントルに沈み込んた_スラフ_内レオロシ_ー (2019)
  • Author(s): 東真太郎, 野村龍一, 上杉健太朗, 西原遊, 土居峻太, 有本岳史, 入舩徹男
  • Organizer: 鉱物科学会2019年年会
• [Presentation] Development of the rotational diamond anvil cell for high-pressure deformation experiments and its measurement systems (2019)
  • Author(s): 東真太郎, 野村龍一, 上杉健太朗, 西原遊, 土居峻太, 有本岳史, 入舩徹男
  • Organizer: 日本地球惑星科学2019年大会
  • Invited
• [Presentation] 回転式ダイヤモンドアンビルセルの開発と下部マントル物質の大歪変形実験 (2019)
  • Author(s): 東真太郎, 野村龍一, 上杉健太朗, 西原遊, 土居峻太, 有本岳史, 入舩徹男,
  • Organizer: 日本地球惑星科学2020年大会
  • Invited
• [Book] 高圧力の科学・技術事典 (2022)
  • Author(s): 日本高圧力学会
  • Total Pages: 500
  • Publisher: 朝倉書店
  • ISBN: 4254102976