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Thermal conductivity measurments of earth materials under high pressure and high temperature

Research Project

Project/Area Number 09640511
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

OSAKA Masahiro  Department of Science and Engineering, National Science Museum, 理工学研究部, 室長 (60132693)

Project Period (FY) 1997 – 1999
Project Status Completed (Fiscal Year 1999)
Budget Amount *help
¥3,300,000 (Direct Cost: ¥3,300,000)
Fiscal Year 1999: ¥500,000 (Direct Cost: ¥500,000)
Fiscal Year 1998: ¥600,000 (Direct Cost: ¥600,000)
Fiscal Year 1997: ¥2,200,000 (Direct Cost: ¥2,200,000)
KeywordsMANTLE MATERIALS / THERMAL CONDUCTIVITY / THERMAL DIFFUSIVITY / HIGH-PRESSURE / DEEP INTERIOR OF THE EARTH / 高圧
Research Abstract

To investigate the thermal state of the earth's mantle, the author measured the thermal conductivity and the thermal diffusivity of mantle candidate minerals under high pressure and at high temperature.
A pulse method using one-dimensional heat flow has been applied to simultaneous thermal diffusivity and thermal conductivity measurements. The sample, made in the form of three identical thin disks, is heated by a pulse current in a thin heater inserted into one interface of the stacked disks. Change of temperature is detected by a thermocouple on the other interface. Thermal diffusivity is determined from decay time of the temperature profile, and thermal conductivity is calculated from the rise of temperature and an electric power for the known thickness of the sample.
Experiments were performed using a uniaxial split-sphere high-pressure apparatus. A magnesia octahedron with a edge length of 18 mm was used as a pressure medium in tungsten carbide anvils with a truncation of 11 mm. Size … More s of the samples were 4 mm in diameter and 1 mm in height. A pair of metallic planar furnaces in the octahedron was used for experiments at high temperatures.
Measurements were made on fused silica, garnet and olivine under pressures up to 8.2 GPa. Extrapolated values of thermal conductivity or thermal diffusiivity to zero pressure agree with those obtained by other methods. Reproducibilities of measurements are within 7 per cent for thermal diffusively and within 15 per cent for thermal conductivity.
Pressure dependences on thermal diffusively or thermal conductivity of mantle minerals are tow or three per cent increase per 1 GPa for garnets and five per cent increase per 1 GPa for the b-axis direction of olivine.
Garnet and olivine were measured at temperatures up to 1000 K under 8.2 GPa. The thermal diffusively or the thermal conductivity of garnet decreases moderately with temperature increase unlike normal insulators in the T-inverse law of thermal conductivity. This is the same effect as seen in previous results under zero pressure. Less

Report

(4 results)
  • 1999 Annual Research Report   Final Research Report Summary
  • 1998 Annual Research Report
  • 1997 Annual Research Report
  • Research Products

    (8 results)

All Other

All Publications (8 results)

  • [Publications] 大迫正弘: "Thermal diffusivity of olivine and garnet single crystals"Bulletin of the National Science Museum,Ser.E. 20巻. 1-7 (1997)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 大迫正弘・伊藤英司: "Simultaneous thermal diffusivity and thermal conductivity measurements of mantle materials up to 10 GP"The Review of High Pressure Science and Technology. 7巻. 110-112 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Masahiro Osako: "Thermal diffusivity of olivine and garnet single crystals"Bull.Natl.Sci.Mus., Ser.E. 20. 1-7 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] Masahiro Osako and Eiji Ito: "Simultaneous thermal diffusivity and thermal conductivity measurements of mantle materials up to 10 GPa"Rev.High Pressure Sci.Tech.. 7. 110-112 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1999 Final Research Report Summary
  • [Publications] 大迫正弘,伊藤英司,米田明: "高温下8GPaまでのマントル鉱物の熱伝導率および熱拡散率"高圧力の科学と技術. 9巻・特別号. 83 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] 大迫正弘・伊藤英司: "カンラン石・ザクロ石の熱伝導率熱拡散率の圧力依存性" 高圧力の科学と技術. 8巻・特別号. 29 (1998)

    • Related Report
      1998 Annual Research Report
  • [Publications] 大迫正弘: "Thermal diffusivity of olivine and garnet single crystals" Bulletin of the National Science Museum,Ser.E. 20巻. 1-7 (1997)

    • Related Report
      1997 Annual Research Report
  • [Publications] 大迫正弘: "Simultaneous thermal diffusivity and thermal conductivity measurements of mantle materials up to 10 GP" The Review of High Pressure Science and Technology. 7巻(印刷中). (1998)

    • Related Report
      1997 Annual Research Report

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Published: 1997-04-01   Modified: 2016-04-21  

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