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Theoretical study on the thermal conductivity of subducting slabs toward understanding the temperature heterogeneity in the lower mantle

Research Project

Project/Area Number 20K04110
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 17040:Solid earth sciences-related
Research InstitutionEhime University

Principal Investigator

Dekura Haruhiko  愛媛大学, 地球深部ダイナミクス研究センター, 講師 (90700146)

Project Period (FY) 2020-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2023: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Keywords格子熱伝導 / 下部マントル / 玄武岩 / パイロライト / 第一原理計算 / 地球下部マントル / 熱伝導 / 理論 / 非調和格子動力学 / 格子動力学 / 分子動力学 / 温度構造 / 熱伝導率 / 格子動力学法 / 分子動力学法
Outline of Research at the Start

本研究では沈み込みスラブの構成鉱物の格子熱伝導率を第一原理非調和格子動力学計算により決定する。下部マントルへと沈み込むスラブ自身,および,スラブと周囲のマントルとの熱的な相互作用の定量的な理解を通じて,下部マントルの温度の不均質構造の制約を目指す。

Outline of Final Research Achievements

One of the most uncertain physical quantities is the temperature of the Earth's interior. Differences in the mineral composition of both the subducting slabs and surrounding mantle result in a substantial heterogeneity in the temperature of the mantle. In this project, I conducted a series of first-principles lattice dynamics calculations based on the density functional theory for the constituent minerals of the basaltic and pyrolitic compositions in the lower mantle. The lattice thermal conductivities of those minerals were successfully determined at high pressure and temperature, which are required to constrain the temperature heterogeneity of the lower mantle due to the subduction of the slabs.

Academic Significance and Societal Importance of the Research Achievements

マントル鉱物の格子熱伝導率は,地球ダイナミクス等の解明に必要となる物理量である。しかし,下部マントル温度・圧力条件下の実験は依然として容易ではない。また,理論研究においても,鉄固溶体などの現実的な化学組成を対象とした計算報告例は極めて少ない。本研究では,沈み込みスラブを構成する鉱物の端成分組成の深部マントルその場条件における格子熱伝導率,ならびに,高温高圧下における鉄固溶効果等について,先駆的な研究成果が得られた。今後,これらの物質科学的な知見を取り入れた熱的進化モデリングの構築を通じて,地球内部の温度構造の進化(熱史)についての理解が促進されるだろう。

Report

(5 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (9 results)

All 2023 2022 2021 2020

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (6 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] Ab initio lattice thermal conductivity of (Mg,Fe)O ferropericlase at the Earth’s lower mantle pressure and temperature2023

    • Author(s)
      Dekura Haruhiko、Tsuchiya Taku
    • Journal Title

      Journal of Physics: Condensed Matter

      Volume: 35 Issue: 30 Pages: 305402-305402

    • DOI

      10.1088/1361-648x/acce16

    • Related Report
      2023 Annual Research Report 2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Ab Initio Study on the Lower Mantle Minerals2020

    • Author(s)
      Tsuchiya Taku, Tsuchiya Jun, Dekura Haruhiko, Ritterbex Sebastian
    • Journal Title

      Annual Review of Earth and Planetary Sciences

      Volume: 48 Issue: 1 Pages: 99-119

    • DOI

      10.1146/annurev-earth-071719-055139

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Study of Lattice Thermal Conductivity of Earth's Lower Mantle Minerals from First-Principles Calculations2020

    • Author(s)
      出倉春彦
    • Journal Title

      The Review of High Pressure Science and Technology

      Volume: 30 Issue: 2 Pages: 102-110

    • DOI

      10.4131/jshpreview.30.102

    • NAID

      130007928825

    • ISSN
      0917-639X, 1348-1940
    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Ab initio lattice thermal conductivity of pyrolytic lower mantle to infer the core-mantle coundary heat flow2023

    • Author(s)
      出倉 春彦,土屋 卓久
    • Organizer
      日本地球惑星科学連合2023年大会
    • Related Report
      2023 Annual Research Report
  • [Presentation] 第一原理鉱物物性学に基づくCMB熱流量モデリング2023

    • Author(s)
      出倉 春彦,土屋 卓久
    • Organizer
      第64回高圧討論会
    • Related Report
      2023 Annual Research Report
  • [Presentation] An ab initio approach to the lattice dynamics of cubic CaSiO3 perovskite2022

    • Author(s)
      Haruhiko Dekura
    • Organizer
      Japan Geoscience Union Meeting 2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] First principles study on the thermal transport properties of the subducting slab2021

    • Author(s)
      Haruhiko Dekura
    • Organizer
      日本地球惑星科学連合大会
    • Related Report
      2021 Research-status Report
  • [Presentation] Effect of iron on the lattice thermal conductivity of lower mantle minerals2021

    • Author(s)
      Haruhiko Dekura
    • Organizer
      Annual Meeting of the Asia Oceania Geosciences Society
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Ab initio lattice thermal conductivity of (Mg,Fe)O ferropericlase at the deepest mantle2020

    • Author(s)
      Dekura Haruhiko
    • Organizer
      日本地球惑星科学連合大会
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2025-01-30  

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