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Measurement of Elastic Wave Velocity of Mg Perovskite Unter High Pressures and Materials of the Lower Mantle

Research Project

Project/Area Number 01540327
Research Category

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

Allocation TypeSingle-year Grants
Research Field 固体地球物理学
Research InstitutionEarthquake Research Institute, University of Tokyo

Principal Investigator

FUJISAWA Hideyuki  Earthquake Research Inst., University of Tokyo, Assistant, 地震研究所, 助手 (50012927)

Project Period (FY) 1989 – 1990
Project Status Completed (Fiscal Year 1990)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1990: ¥400,000 (Direct Cost: ¥400,000)
Fiscal Year 1989: ¥1,700,000 (Direct Cost: ¥1,700,000)
KeywordsMagnesium Perovskite / Elastic Wave Velocity / 670km Discontinuity / High Pressure Experiment / Lower Mantle / Mantle Minerals / Mg・ペロボスカイト
Research Abstract

All through the measurement under high pressures which correspond to the earth's lower mantle we have to use a very small sample, the length of which is a few millimeter, because an available volume in the high pressure apparatus under such conditions is very limitted.
There exists no natural Mg perovskite, and we have to use a synthesized sample.
First of all we have to develop a electronic system for the accurate measurement of elastic wave velocity with a very small mineral sample, because no such system has not yet existed in the world. We have modified our original system for the measurements of velocities of the upper mantle minerals.
Mg perovskite samples was synthesized under pressures more than 20GPa by Prof. E. Ito of Institute for Study of the Earth's Interior, Okayama University. The length of sample is about 2mm, the diameter is about 1mm.
With the modified system we first tried to observe a transmitted signal through this small diameter. The simple observation of this kind of signals has been very successful.
However, in successive trials to measure pressure dependence of the velocity we have not been able to observe clear signals under high pressures.

Report

(3 results)
  • 1990 Annual Research Report   Final Research Report Summary
  • 1989 Annual Research Report
  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] 藤沢 英幸: "オリビンはマントルに存在するか?、(マントル鉱物の弾性波速度の測定と400km不連続の成因の研究)" 岩鉱. 特別号No.4. 115-120 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] T.Sasakura,K.Suito,H.Fujisawa: "Measurement of ultrasonic wave velocities in fused quartz under hydrostatic pressures upto 6.0 GPa" Proc.Xlth AIRAPT lnternational Conference on High Pressure,Kiev(1987),Kiev Naukova Dumka. 2. 60-72 (1989)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] T.Sasakura,H.Yoneda,K.Suito,H.Fujisawa: "Variation of the elastic constants of lnSb near the covalent‐metalic transition," High Pressure Research. 4. 318-320 (1990)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] H. Fujisawa: "Dose olivine exist in the mantle?" Ganko (Special Volume). NO. 4. 115-120 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] T. Sasakura, K. Suito, H. Fujisawa: "Measurement of ultrasonic wave velocities in fused quartz under hydrostatic pressures up to 6.0 GPa" Proc. XIth AIRAPT International Conference on High Pressure, Kiev(1987), Kiev Naukova Dumka. VOL. 2. 60-72 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] T. Sasakura, H. Yoneda, K. Suito, H. Fujisawa,: "Variation of the elastic constants of InSb near the covalent-metallic transition," High Pressure Res.VOL. 4. 318-320 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1990 Final Research Report Summary
  • [Publications] 藤沢 英幸: "オリビンはマントルに存在するか?、(マントル鉱物の弾性波速度の測定と400km不連続の成因の研究)" 岩鉱. 特別号No.4. 115-120 (1989)

    • Related Report
      1990 Annual Research Report
  • [Publications] T.Sasakura,K.Suito,H.Fujisawa: "Measurement of ultrasonic wave velocities in fused quartz under hydrostatic pressures upto 6.0 GPa" Proc.XIth AIRAPT International Conference on High Pressure,Kiev(1987),Kiev Naukova Dumka. 2. 60-72 (1989)

    • Related Report
      1990 Annual Research Report
  • [Publications] T.Sasakura,H.Yoneda,K.Suito,H.Fujisawa: "Variation of the elastic constants of InSb near the covalentーmetalic transition," High Pressure Res.4. 318-320 (1990)

    • Related Report
      1990 Annual Research Report
  • [Publications] 藤澤英幸: "オリビンはマントルに存在するか?" 岩石・鉱物・鉱床学会誌(岩鉱). 特別号No.4. 115-120 (1989)

    • Related Report
      1989 Annual Research Report

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Published: 1989-04-01   Modified: 2016-04-21  

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