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In Situ X-ray Diffraction Study on Silicate Perovskite and the Chemical Composition of the Lower Mantle

Research Project

Project/Area Number 05452071
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 固体地球物理学
Research InstitutionUniversity of Tokyo

Principal Investigator

YAGI Takehiko  Institute for Solid State Physics Associate Professor, 物性研究所, 助教授 (20126189)

Co-Investigator(Kenkyū-buntansha) KONDO Tadashi  Institute for Solid State Physics Research Associate, 物性研究所, 助手 (20252223)
UTSUMI Wataru  Institute for Solid State Physics Research Associate, 物性研究所, 助手 (60193918)
Project Period (FY) 1993 – 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥6,700,000 (Direct Cost: ¥6,700,000)
Fiscal Year 1994: ¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1993: ¥4,700,000 (Direct Cost: ¥4,700,000)
KeywordsLower mantle / Silicate perovskite / Equation of state / High pressure / ケイ酸塩ペロブスカイト / 高圧X線実験 / 焼結ダイヤモンドアンビル / ドリッカーマー型高圧発生装置 / 多段式高圧発生装置 / 下部マントル条件 / ケイ酸塩ペロフスカイト / 高温高圧X線その場観察 / 下部マントルの化学組成 / MAX80装置
Research Abstract

The purpose of the present study was to discuss the chemical composition of the lower mantle through the precise determination of equation of state of silicate perovskite, which is believed to be the most abundant mineral of the Earth's lower mantle. For this purpose, we first developed several different types of high pressure and high temperature apparatuses for in situ X-ray diffraction study, using sintered diamond as an anvil material.
Among them, the Drickamer-type apparatus covers the widest range of pressure. Because of the large deviatoric stresses, however, this apparatus was not suitable for precise equation of state study. We used both cubic-anvil type and 6-8 type double stage apparatus for the present study. We have made many improvements in using these apparatuses and we have succeeded in measuring the equation of state of MgSiO_3 perovskite up to 29 GPa and 2000K.Analyzing these data, we have obtained accurate equation of state on MgSiO_3 perovskite under the uppermost condition of the lower mantle. Compared to the previous studies, the accuracy of the present measurement was improved dramatically. Considering the possibilities of many systematic errors in the measurement, however, the absolute reliability of the present equation of state is still not high enough to give any strong constraints on the chemical composition of the lower mantle. If we make discussions using the mean value obtained by the present analysis, the chemical composition of the lower mantle seems to be slightly rich in Si compared to the upper mantle. In order to strengthen this conclusion, we are planning to extend our measurement further into higher pressure regions.

Report

(3 results)
  • 1994 Annual Research Report   Final Research Report Summary
  • 1993 Annual Research Report
  • Research Products

    (27 results)

All Other

All Publications (27 results)

  • [Publications] N.Funamori: "High pressure and high temperature in situ X-ray observation of MgSiO_3 perovskite under lower mantle condition" Geophys.Res.Lett.20. 387-390 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] T.Kondo: "Ultrahigh-pressure and high-temperature generation by use of the MA8 system with sintered-diamond anvils" High T.High P.25. 105-112 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] T.Kondo: "The use of sintered diamond anvils in the MA8 type high pressure apparatus" “Pure and Applied Geophysics" Birkhavser,Boston. 141. 601-614 (1993)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] T.Yagi: "Recent advances in high pressure and high temperature in-situ X-ray studies using sintered diamond and synchrotron radiation" Proceedings of the 14th AIRAPT Conference,Colorado. 1621-1624 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] N.Funamori: "Stability field of the orthorhombic perovskite type of MgSiO_3" Proceedings of the 14th AIRAPT Conference,Colorado. 791-794 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] W.Utsumi: "Thermal expansivity of MgSiO_3 perovskite under high pressure up to 20 GPa" Geophys.Res.Lett.,. (in press). (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] N.Funamori: "Thermoelastic properties of MgSiO_3 perovskite(I);direct measurement of thermal expansion at 25 GPa" J.Geophys.Res.,. (submitted). (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] N.Funamori: "Thermoelastic properties of MgSiO_3 perovskite(II);determination of equation of state and its reliability" J.Geophys.Res.,submitted. (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] T.Yagi: "Chemical composition of the lower mantle inferred from the equation of state of MgSiO_3 perovskite" (in preparation).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] N.Funamori: "High pressure and high temperature in situ X-ray pbservation of MgSiO_3 perovskite under lower mantle condition" Geophys.Res.Lett.20. 387-390 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] T.Kondo: "Ultrahigh-pressure and high-temperature generation by use of the MA8 system with sintered-diamond anvils" High T.High P.25. 105-112 (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] T.Kondo: "The use of sintered diamond anvils in the MA8 type high pressure apparatus" "Pure and Applied Geophysics"Vol.141, pp601-614, Birkhavser, Boston. (1993)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] T.Yagi: "Recent advances in high pressure and high temperature in-situ X-ray studies using sintered diamond and synchrotron radiation" Proceedings of the 14th AIRAPT Conference, Colorado. 1621-1624 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] N.Funamori: "Stability field of the orthorhombic perovskite type of MgSiO_3" Proceedings of the 14th AIRAPT Conference, Colorado. 791-794 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] W.Utsumi: "Thermal expansivity of MgSiO_3 perovskite under high pressure up to 20 GPa" Geophys.Res.Lett.(in press). (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] N.Funamori: "Thermoelastic properties of MgSiO_3 perovskite (I) ; direct measurement of thermal expansion at 25 GPa" J.Geophys.Res.(submitted). (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] N.Funamori: "Thermoelastic properties of MgSiO_3 perovskite (II) ; determination of equation of state and its reliability" J.Geophys.Res.(submitted). (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] T.Yagi: "Chemical composition of the lower mantle inferred from the equation of state of MgSiO_3 perovskite" (in preparation). (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] T.Yagi: "Structures and Properties of Perovskite-type Compounds Synthesized Under Very High Pressures" NIRIM International Symposium onAdvanced Materials´94,ed.M.Kamo,H.Kanda,Y.Matsui and T.Sekine. 223-228 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] N.Funamori,T.Yagi,and T.Uchida,: "Deviatoric Stress Measurement under Uniaxial Compression by a Powder X-ray Diffraction Metho" J.Appl.Phys.75. 4327-4331 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] T.Yagi: "Recent advances in high pressure and high temperature in-situ X-ray studies using sintered diamond and synchrotron radiation" Proceedings of the 14th AIRAPT Conference,Colorado. 1621-1624 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] N.Funamori,T.Yagi,T.Uchida,and W.Utsumi: "Stability field of the orthorhombic perovskite type of MgSiO_3" Proceedings of the 14th AIRAPT Conference,Colorado. 791-794 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] W.Utsunomi,N.Funamori,T.Yagi,E.Ito,T.Kikegewa,and O.Shimomura: "Thermal Expansivity of MgSiO_3Perovskite under High Pressures up to 20 GPa" Geophys.Res.Lett.,in press.

    • Related Report
      1994 Annual Research Report
  • [Publications] N.Funamori,T.Yagi,W.Utsumi,T.Kondo,T.Uchida,and M.Seki: "Thermoelastic properties of MgSiO_3Perovskite(I); direct measurement of thermal expansion at 25 GPa" J.Geophys.Res.,in press.

    • Related Report
      1994 Annual Research Report
  • [Publications] N.Funamori: "High Pressure and high temperature in situ X-ray observation of MgSio_3 perorskite under lower mantle condition" Geophys.Res.Lett.20. 387-390 (1993)

    • Related Report
      1993 Annual Research Report
  • [Publications] N.Funamori: "Deviatoric stress Measurement under Uriaxial Compression by a Power X-ray Diffraction Method" J.Appl.Phys.(印刷中).

    • Related Report
      1993 Annual Research Report
  • [Publications] T.Yagi: "Recent advances in high pressure and high temperature in-situ X-ray studies using Sintered diamond and synchrotron radiation" High Pressure Resarch. (印刷中).

    • Related Report
      1993 Annual Research Report

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Published: 1993-04-01   Modified: 2016-04-21  

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