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2013 Fiscal Year Final Research Report

Verification of ultra-low strain rate effect on olivine rheology

Research Project

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Project/Area Number 23340162
Research Category

Grant-in-Aid for Scientific Research (B)

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

Principal Investigator

ANDO Jun-ichi  広島大学, 理学(系)研究科(研究院), 准教授 (50291480)

Co-Investigator(Kenkyū-buntansha) HIRAGA Takehiko  東京大学, 地震研究所, 准教授 (10444077)
MORISHITA Tomoaki  金沢大学, 自然システム学系, 教授 (80334746)
OHFUJI Hiroaki  愛媛大学, 地球深部ダイナミクス研究センター, 准教授 (80403864)
Project Period (FY) 2011-04-01 – 2014-03-31
Keywordsマントルのレオロジー / オリビン / 塑性変形 / 歪速度効果 / コットレル雰囲気
Research Abstract

In this research, we observed the microstructures of both alpine-type peridotites and peridotite xenoliths in basalt, and analyzed the microchemistry around the dislocations developed in the olivine grains of the studied samples, using optical microscopy, EPMA, EBSD, TEM and ATEM techniques to clarify if the ultra-low strain rate has any effect on the olivine plasticity. We detected Fe-concentration along dislocation line in all observed samples, which was probably caused by Cottrell atmosphere. This result strongly suggests that the effect of ultra-low strain rate on olivine plasticity is very important to understand the dynamics of the upper mantle, which has not been studied so far. In addition, we tried to do the deformation experiments of olivine to support the above conclusion, which has yet to produce any confirming results.

  • Research Products

    (6 results)

All 2013 2012

All Presentation (6 results)

  • [Presentation] Ultra- low strain rate effect in the upper mantle : constraint from microstructural obser- vation on naturally deformed olivine. American Geophysical Union2013

    • Author(s)
      T. Yamamoto, J. Ando, H. Ohfuji, T. Morishita, N. Tomioka, K. Watanabe
    • Organizer
      Fall Meeting
    • Place of Presentation
      San Francisco, USA
    • Year and Date
      20131209-13
  • [Presentation] かんらん石の衝撃圧縮実験 : 深発地震震源過程解明に向けての試験的研究-その22013

    • Author(s)
      小畑正明, 真下茂, 陳黎亮, 安東淳一, 山本貴史
    • Organizer
      日本地質学会第120年学術大会
    • Place of Presentation
      東北大学
    • Year and Date
      20130914-16
  • [Presentation] カンラン岩中の変形したオリビンの微細組織観察. 上部マントル起源のオリビンの微細組織観察から探る超低歪速度効果の検証2013

    • Author(s)
      山本貴史, 安東淳一, 大藤弘明, 森下知晃, 富岡尚敬, 渡辺克晃
    • Organizer
      日本鉱物科学会2013年年会
    • Place of Presentation
      筑波大学
    • Year and Date
      20130911-13
  • [Presentation] カンラン岩中の変形したオリビンの微細組織観察2013

    • Author(s)
      山本貴史, 安東淳一, 大藤弘明, 富岡尚敬, 森下知晃
    • Organizer
      日本地球惑星科学連合2013年大会
    • Place of Presentation
      千葉
    • Year and Date
      20130519-24
  • [Presentation] マントル起源のオリビンを用いた超低歪速度効果の検証2012

    • Author(s)
      山本貴史, 安東淳一, 大藤弘明, 森下知晃, 富岡尚敬, 渡辺克晃
    • Organizer
      日本鉱物科学会2012年年会
    • Place of Presentation
      京都大学
    • Year and Date
      20120919-21
  • [Presentation] マントル起源のオリビンに記録されている超低歪速度効果の探査2012

    • Author(s)
      山本貴史, 安東淳一, 大藤弘明, 森下知晃, 富岡尚敬, 渡辺克晃
    • Organizer
      日本地球惑星科学連合2012年大会
    • Place of Presentation
      千葉
    • Year and Date
      20120522-27

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Published: 2015-06-25  

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