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Water behavior at the core-mantle boundary and the interior of the icy planet.

Research Project

Project/Area Number 19H01994
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 17040:Solid earth sciences-related
Research InstitutionOsaka University (2021)
Ehime University (2019-2020)

Principal Investigator

Nishi Masayuki  大阪大学, 理学研究科, 准教授 (10584120)

Co-Investigator(Kenkyū-buntansha) 土屋 旬  愛媛大学, 地球深部ダイナミクス研究センター, 准教授 (00527608)
桑山 靖弘  東京大学, 大学院理学系研究科(理学部), 特任助教 (00554015)
Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥17,810,000 (Direct Cost: ¥13,700,000、Indirect Cost: ¥4,110,000)
Fiscal Year 2021: ¥2,990,000 (Direct Cost: ¥2,300,000、Indirect Cost: ¥690,000)
Fiscal Year 2020: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2019: ¥11,310,000 (Direct Cost: ¥8,700,000、Indirect Cost: ¥2,610,000)
Keywordsマントル / 水 / 中心核 / 含水鉱物 / 地球・惑星内部構造
Outline of Research at the Start

本研究では、地球を含む惑星内部の水の存在形態や大規模循環の解明を目的とする。特に地球マントルー中心核境界に運ばれた水の化学反応や、大型惑星内部において水を貯蔵可能な含水鉱物の理解を目指し、高温高圧発生実験や数値計算に基づいた研究を行う。

Outline of Final Research Achievements

In this study, the chemical reaction between metallic iron and a limited water supply at ~120 GPa was investigated using the laser-heated diamond anvil cell technique. Contrary to the results of earlier studies, the formation of FeO instead of FeO2Hx without intermediate phases was observed. Also, we found that δ-AlOOH transforms into a new phase with orthorhombic symmetry, named ε-AlOOH, at 190 GPa.

Academic Significance and Societal Importance of the Research Achievements

地球内部を循環する水が、金属鉄から成る地球中心核の表面に酸化鉄つくることが示唆された。地球内部の対流運動や中心核―マントル境界の性質、地震波異常の起源などを知るうえで重要な知見となると期待される。また、これまで実験的に検証されることのなかった地球マントル圧力を超える超高圧に耐える含水鉱物が存在することが分かった。地球より大きな惑星の内部はこのような超高圧環境が想定されるため、地球以外の惑星内部の水の挙動に関する新たな知見となった。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • Research Products

    (11 results)

All 2021 2020 2019

All Journal Article (6 results) (of which Int'l Joint Research: 1 results,  Open Access: 2 results,  Peer Reviewed: 5 results) Presentation (5 results) (of which Int'l Joint Research: 1 results,  Invited: 1 results)

  • [Journal Article] Phase transition of aluminium hydroxide at extremely high pressure2021

    • Author(s)
      Masayuki Nishi
    • Journal Title

      SPring-8/SACLA Research Frontiers 2020

      Volume: - Pages: 100-101

    • Related Report
      2021 Annual Research Report
    • Open Access
  • [Journal Article] Chemical Reaction Between Metallic Iron and a Limited Water Supply Under Pressure: Implications for Water Behavior at the Core‐Mantle Boundary2020

    • Author(s)
      Nishi M.、Kuwayama Y.、Hatakeyama T.、Kawaguchi S.、Hirao N.、Ohishi Y.、Irifune T.
    • Journal Title

      Geophysical Research Letters

      Volume: 47 Issue: 19 Pages: 089616-089616

    • DOI

      10.1029/2020gl089616

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Water Transport into the Deep Mantle by Hydrous Phases2020

    • Author(s)
      NISHI Masayuki
    • Journal Title

      The Review of High Pressure Science and Technology

      Volume: 30 Issue: 2 Pages: 95-101

    • DOI

      10.4131/jshpreview.30.95

    • NAID

      130007928838

    • ISSN
      0917-639X, 1348-1940
    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] New aluminium hydroxide at multimegabar pressures: Implications for water reservoirs in deep planetary interiors2020

    • Author(s)
      Nishi Masayuki、Kuwayama Yasuhiro、Tsuchiya Jun
    • Journal Title

      Icarus

      Volume: 338 Pages: 113539-113539

    • DOI

      10.1016/j.icarus.2019.113539

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Solid Solution and Compression Behavior of Hydroxides in the Lower Mantle2019

    • Author(s)
      Nishi M.、Tsuchiya J.、Kuwayama Y.、Arimoto T.、Tange Y.、Higo Y.、Hatakeyama T.、Irifune T.
    • Journal Title

      Journal of Geophysical Research: Solid Earth

      Volume: 124 Issue: 10 Pages: 10231-10239

    • DOI

      10.1029/2019jb018146

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Solubility behavior of δ-AlOOH and ε-FeOOH at high pressures2019

    • Author(s)
      Xu Chaowen、Nishi Masayuki、Inoue Toru
    • Journal Title

      American Mineralogist

      Volume: 104 Issue: 10 Pages: 1416-1420

    • DOI

      10.2138/am-2019-7064

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] 下部マントルにおける地殻物質の再含水化に関する実験的検証2021

    • Author(s)
      高市合流、西真之、西原遊
    • Organizer
      第62回高圧討論会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Role of deep water cycle on the core-mantle interaction2021

    • Author(s)
      西真之
    • Organizer
      惑星深部理論研究会
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] Polycrystalline diamond sintered from ultradispersed nanodiamonds2019

    • Author(s)
      西 真之, 山本 幸一郎, 周 佑黙, 入舩 徹男
    • Organizer
      日本地球惑星科学連合2019年大会
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 核―マントルの相互作用における水の影響2019

    • Author(s)
      西 真之, 畑山 達郎,入舩 徹男
    • Organizer
      第60回高圧討論会
    • Related Report
      2019 Annual Research Report
  • [Presentation] マルチメガバールの新含水高圧相ε-AlOOH2019

    • Author(s)
      西真之, 桑山靖弘, 土屋旬
    • Organizer
      日本鉱物科学会2019年年会
    • Related Report
      2019 Annual Research Report

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Published: 2019-04-18   Modified: 2023-01-30  

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