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Rheological weakening due to phase mixing in olivine + orthopyroxene rocks

Research Project

Project/Area Number 16K17832
Research Category

Grant-in-Aid for Young Scientists (B)

Allocation TypeMulti-year Fund
Research Field Petrology/Mineralogy/Economic geology
Research InstitutionShimane University

Principal Investigator

Tasaka Miki  島根大学, 総合理工学研究科, 特任講師 (80772243)

Research Collaborator Kohlstedt David L.  University of Minnesota, Department of Earth Science
Zimmerman Mark E.  University of Minnesota, Department of Earth Science
Stünitz Holger  University of Tromsø, Department of Geology
Heilbronner Renée  Basel University, Geological Institute
Project Period (FY) 2016-04-01 – 2018-03-31
Project Status Completed (Fiscal Year 2017)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2017: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2016: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Keywordsかんらん石 / 輝石 / 鉱物混合層 / 歪み弱化 / 拡散速度 / 歪弱化 / 歪み集中 / 変形実験 / かんらん岩
Outline of Final Research Achievements

To understand the processes involved in rheological weakening due to phase mixing, we conducted high-strain torsion experiments.
Samples composed of olivine plus 26% orthopyroxene were deformed to outer radius shear strains of up to γ <= 26. Microstructural observations demonstrate that, with increasing shear strain, grain size decreased and mixtures of small, equant grains developed. The mechanical data with associated changes in microstructure demonstrated that our samples deformed (i) by dislocation-accommodated grain-boundary sliding (disGBS) with subgrains present at lower strains and (ii) by disGBS with subgrains absent at higher strains. The evolution of both the mechanical and the microstructural properties observed in this study provide insights into the dynamic processes associated with rheological weakening and strain localization in the plastically deforming portion of the lithosphere.

Report

(3 results)
  • 2017 Annual Research Report   Final Research Report ( PDF )
  • 2016 Research-status Report
  • Research Products

    (14 results)

All 2017 2016 Other

All Int'l Joint Research (6 results) Journal Article (2 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 2 results) Presentation (4 results) (of which Int'l Joint Research: 2 results) Remarks (2 results)

  • [Int'l Joint Research] ミネソタ大学(米国)

    • Related Report
      2017 Annual Research Report
  • [Int'l Joint Research] トロムソ大学(ノルウェー)

    • Related Report
      2017 Annual Research Report
  • [Int'l Joint Research] バーゼル大学(スイス)

    • Related Report
      2017 Annual Research Report
  • [Int'l Joint Research] University of Minnesota-Twin Cities(米国)

    • Related Report
      2016 Research-status Report
  • [Int'l Joint Research] Basel University(スイス)

    • Related Report
      2016 Research-status Report
  • [Int'l Joint Research] Troms&oslash; University(ノルウェー)

    • Related Report
      2016 Research-status Report
  • [Journal Article] Rheological weakening of olivine + orthopyroxene aggregates due to phase mixing, Part2: Microstructural development2017

    • Author(s)
      Tasaka, M., M. E. Zimmerman, D. L. Kohlstedt, H. Stunitz, and R. Heilbronner
    • Journal Title

      Journal of Geophysical Research- Solid Earth

      Volume: 122 Issue: 10 Pages: 7597-7612

    • DOI

      10.1002/2017jb014311

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Rheological weakening of olivine + orthopyroxene aggregates due to phase mixing, Part1: Mechanical behavior2017

    • Author(s)
      Tasaka, M., M. E. Zimmerman, and D. L. Kohlstedt
    • Journal Title

      Journal of Geophysical Research- Solid Earth

      Volume: 122 Issue: 10 Pages: 7584-7596

    • DOI

      10.1002/2017jb014333

    • Related Report
      2017 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 輝石の量比の異なるかんらん岩を用いた鉱物混合層形成に伴う歪み弱化の解明2017

    • Author(s)
      田阪 美樹, M. E. Zimmerman, and D. L. Kohlstedt
    • Organizer
      地球惑星連合大会2017年
    • Related Report
      2017 Annual Research Report
  • [Presentation] Rheological weakening due to phase mixing in olivine + orthopyroxene aggregates2016

    • Author(s)
      D. L. Kohlstedt
    • Organizer
      AGU Fall Meeting
    • Place of Presentation
      サンフランシスコ、アメリカ合衆国
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] Rheological and microstructural development in olivine aggregates during dislocation creep under hydrous conditions2016

    • Author(s)
      M. Tasaka
    • Organizer
      Goldschmidt
    • Place of Presentation
      横浜、パシフィコ横浜
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] 鉱物混合層形成にともなう歪み弱化2016

    • Author(s)
      田阪 美樹
    • Organizer
      地球惑星連合大会2016年
    • Place of Presentation
      幕張、幕張メッセ
    • Related Report
      2016 Research-status Report
  • [Remarks] 島根大学総合理工学部地球科学科

    • URL

      http://www.geo.shimane-u.ac.jp/

    • Related Report
      2017 Annual Research Report
  • [Remarks] https://sites.google.com/site/mikitasak005/

    • Related Report
      2016 Research-status Report

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Published: 2016-04-21   Modified: 2022-06-07  

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