• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Measurements of thermophysical properties of deep Earth materials under high pressure and high temperature

Research Project

Project/Area Number 14540401
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field 固体地球物理学
Research InstitutionNational Science Museum

Principal Investigator

OSAKO Masahiro  National Science Museum, Dept. Science & Engineering, Chief, 理工学研究部, 室長 (60132693)

Project Period (FY) 2002 – 2004
Project Status Completed (Fiscal Year 2004)
Budget Amount *help
¥3,100,000 (Direct Cost: ¥3,100,000)
Fiscal Year 2004: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 2003: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2002: ¥1,500,000 (Direct Cost: ¥1,500,000)
Keywordsthermal conductivity / thermal diffusivity / high pressure / Kawai-type apparatus / olivine / garnet / heat capacity / マントル物質 / 比熱容量 / 高圧力
Research Abstract

Thermal diffusivity and thermal conductivity of major mantle candidate materials have been measured under pressures up to 8-10 GPa and temperatures to 1100 K, using a pulse-heating method of one-dimensional heat flow in a Kawai-type apparatus. The results show that the thermal conductivity or diffusivity of these major mantle minerals increases 3-4 % per 1 GPa, and that olivine likely preserves anisotropy in thermal diffusivity or conductivity throughout its stability in the mantle, i.e. down to 410 km depth. Garnet shows somewhat peculiar behavior of thermal conductivity or thermal diffusivity : their decrease by heating and increase by pressurizing are moderate compared to other dense oxides and olivine. Another major mantle material, pyroxene shows similar behavior of thermal conductivity or diffusivity to olivine. The present results of pressure dependence in thermal conductivity of diffusivity agree with previous experiments and theoretical predictions.
As thermal diffusivity and t … More hermal conductivity are measured simultaneously, heat capacity is obtained by comparing these quantities. This study demonstrates a novel aspect of mineral physics : that the heat capacity of mantle materials under pressure could be determined experimentally. Heat capacities of olivine and garnet at room temperature are within 5 % of previously reported values. Moreover, the heat capacities for the three crystallographic directions in olivine are consistent within 6 %, which shows the adequacy of the present method for thermal diffusivity and conductivity. Under high pressures, heat capacities have slightly lower values to those at zero pressure. This is consistent with the identity of thermodynamics for changes in heat capacity under pressure.
For future study, the pressure range will exceed 15 GPa, which is equivalent to those at the bottom of the upper mantle, and measurements of marked precision are hope to be performed with reduction of systematic errors probably derived from mechanical defect or deformation of the sample assembly by compression. Less

Report

(4 results)
  • 2004 Annual Research Report   Final Research Report Summary
  • 2003 Annual Research Report
  • 2002 Annual Research Report
  • Research Products

    (4 results)

All 2004 Other

All Journal Article (3 results) Publications (1 results)

  • [Journal Article] Simultaneous measurements of thermal diffusivity and thermal conductivity for garnet and olivine under high pressure.2004

    • Author(s)
      Osako, M., Ito, E., Yoneda, A.
    • Journal Title

      Physics of the Earth and Planetary Interiors 143, 144

      Pages: 311-320

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Simultaneous measurements of thermal diffusivity and thermal conductivity for garnet and olivine under high pressure.2004

    • Author(s)
      Osako, M., Ito, E., Yoneda, A.
    • Journal Title

      Physics of the Earth and Planetary Interiors 143-144

      Pages: 311-320

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2004 Final Research Report Summary
  • [Journal Article] Simultaneous measurements of thermal conductivity and thermal diffusivity for garnet and olivine under high pressure2004

    • Author(s)
      Masahiro Osako, Eiji Ito, Akira Yoneda
    • Journal Title

      Physics of the Earth and planetary interiors 143-144

      Pages: 311-320

    • Related Report
      2004 Annual Research Report
  • [Publications] Masahiro Osako, Eiji Ito, Akira Yoneda: "Simultaneous measurements of thermal conductivity and thermal diffusivity for garnet and olivine under high pressure"Physics of the Earth and planetary interiors. (doi:10.1016/j.pepi.2003.10.010) (2004)

    • Related Report
      2003 Annual Research Report

URL: 

Published: 2002-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi