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Quantitative estimation of the shock pressure experienced by each ordinary chondrite through lattice strain of olivine crystals

Research Project

Project/Area Number 16540440
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Petrology/Mineralogy/Science of ore deposit
Research InstitutionKyushu University

Principal Investigator

NAKAMUTA Yoshihiro  Kyushu University, Kyushu University Museum, Associate Profesor, 総合研究博物館, 助教授 (80128058)

Co-Investigator(Kenkyū-buntansha) NAKAMURA Tomoki  Kyushu University, Faculty of Sciences, Associate Professor, 大学院理学研究院, 助教授 (20260721)
KUWAHARA Yoshihiro  Kyushu University, Faculty of Social and Cultural Studies, Associate Professor, 大学院比較社会文化研究院, 助教授 (90281196)
Project Period (FY) 2004 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2006: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 2005: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 2004: ¥1,800,000 (Direct Cost: ¥1,800,000)
Keywordschondrite / olivine / apparent strain / shock event / X-ray diffraction / Gandolfi camera / dislocation density / TEM / 衝撃圧 / 格子欠陥 / 集束イオンビーム法
Research Abstract

We determined the correlation line between apparent strains of olivine crystals obtained by the X-ray powder diffraction method and shock pressures loaded on them with the aim of quantitatively estimating the degree of shock experienced by each meteorite. The micro-structures of crystals, from which apparent strains obtained by the X-ray method arise, were also inferred. The apparent strains of olivine crystals were determined by using small crystals taken out from polished thin sections, of about 100 μm in size, after the analysis of chemical compositions by EPMA. Micro-structures of olivine crystals, of which apparent strains were determined by the X-ray method, were observed by TEM after processed by the FIB method.
On the basis of shock experiments, it was found that the apparent strains of olivine crystals increase in direct proportion with the increase of shock pressures loaded on them. The slope of the line showing the relation between the apparent strains and the shock pressures … More also increases gradually with the increase of the duration at a peak shock-pressure of each experiment and seems to converge at a constant value over the duration of 2 μs.
Based on the apparent strains determined for the olivine crystals from meteorites and the ranges of shock pressures estimated for each shock-stage of meteorites, the correlation line applicable to meteorites is also restricted to the range where shock pressures can be estimated with 20 % of uncertainties from the apparent strains of olivine crystals. The correlation line determined by the shock experiments with 1.8μs duration is in the middle of the probable region of the correlation line obtained by the method mentioned above. Then, shock pressures experienced by each meteorite can be quantitatively estimated with 20 % of uncertainties by measuring apparent strains of olivine crystals in meteorites.
The dislocation densities of olivine crystals were measured on the dark-field images taken by TEM. The logarithm of the dislocation density was found to increase in direct proportion with the increase of the apparent strain. The result reveals that apparent strain arises from dislocations formed by shock. Less

Report

(4 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report
  • 2004 Annual Research Report
  • Research Products

    (11 results)

All 2006 2005

All Journal Article (11 results)

  • [Journal Article] Structural state of plagioclase from the Kobe CK chondrites : implications for the thermal history of the CK parent body2006

    • Author(s)
      Y.Nakamuta, T.Nakamura, N.Nakamura
    • Journal Title

      Journal of Mineralogical and petrological Sciences 101

      Pages: 308-318

    • NAID

      130000254253

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] コンドライト隕石中のかんらん石結晶の見かけ格子歪みと転位の関係2006

    • Author(s)
      青木大空, 藤昇一, 中牟田義博
    • Journal Title

      九州大学超高圧電顕室研究報告 30

      Pages: 113-114

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Structural state of plagioclase from the Kobe CK chondrite : implications for the thermal history of the CK parent body2006

    • Author(s)
      Y.Nakamuta, T.Nakamura, N.Nakamura
    • Journal Title

      Journal of Mineralogical and Petrological Sciences 101

      Pages: 308-318

    • NAID

      130000254253

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] The relationship between apparent strains and dislocations of olivine crystals in a chondrite (in Japanese)2006

    • Author(s)
      T.Aoki, S.Toh, Y.Nakamuta
    • Journal Title

      Annual Reports of HVEM Laboratory, Kyushu University 30

      Pages: 113-114

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Structural state of plagioclase from the Kobe CK chondrites : Implications for the thermal history of the CK parent body2006

    • Author(s)
      Y.Nakamuta, T.Nakamura, N.Nakamura
    • Journal Title

      Journal of mineralogical and petrological Science 101

      Pages: 308-318

    • NAID

      130000254253

    • Related Report
      2006 Annual Research Report
  • [Journal Article] コンドライト隕石中のかんらん石結晶の見かけ格子歪みと移転の関係2006

    • Author(s)
      青木大空, 藤昇一, 中牟田義博
    • Journal Title

      九州大学超高圧電顕室研究報告 30

      Pages: 113-114

    • Related Report
      2006 Annual Research Report
  • [Journal Article] 集束イオンビーム法を用いたX線単結晶試料の加工2005

    • Author(s)
      藤昇一, 青木大空, 中牟田義博
    • Journal Title

      九州大学超高圧電顕室研究報告 29

      Pages: 97-98

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary 2005 Annual Research Report
  • [Journal Article] X線回折実験を行った衝撃隕石の微細組織観察2005

    • Author(s)
      青木大空, 藤昇一, 中牟田義博
    • Journal Title

      九州大学超高圧電顕室研究報告 29

      Pages: 2005-2005

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary 2005 Annual Research Report
  • [Journal Article] Fabrication of a single crystal by Focused Ion beam after X-ray diffraction analysis (in Japanese)2005

    • Author(s)
      S.Toh, T.Aoki, Y.Nakamuta
    • Journal Title

      Annual Reports of HVEM Laboratory, Kyushu University 29

      Pages: 97-98

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] TEM observation of an olivine crystal in a shocked meteorite (in Japanese)2005

    • Author(s)
      T.Aoki, S.Toh, Y.Nakamuta
    • Journal Title

      Annual Reports of HVEM Laboratory, Kyushu University 29

      Pages: 99-100

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Modal abundances of carbon in ureilites : Implications for the petrogenesis of ureilites.2005

    • Author(s)
      Nakamuta, Y.
    • Journal Title

      36^<th> Lunar and Planetary Science Conference

    • Related Report
      2004 Annual Research Report

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Published: 2004-04-01   Modified: 2016-04-21  

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