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Temporal change in crustal strength based on the analysis of deformation microstructures in the lower crustal rocks

Research Project

Project/Area Number 16K05613
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Petrology/Mineralogy/Economic geology
Research InstitutionOsaka City University

Principal Investigator

Okudaira Takamoto  大阪市立大学, 大学院理学研究科, 教授 (20295679)

Project Period (FY) 2016-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,550,000 (Direct Cost: ¥3,500,000、Indirect Cost: ¥1,050,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2016: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywords延性剪断帯 / 下部地殻 / 破壊 / 地震発生領域 / 変形機構 / 斜長石 / 内陸地震 / 結晶方位解析 / 地殻強度 / 細粒化過程 / クリープ変形 / マイロナイト / 粒径依存クリープ / 吸水変成反応 / 歪み軟化 / 粒径依存型クリープ / 動的再結晶 / 下部地殻レオロジー / 変成岩 / 地殻流体
Outline of Final Research Achievements

Since the deformation in the lower crust immediately below a seismogenic fault can accumulate the stress on the fault, understanding the dominant deformation mechanism and the formation of ductile shear zones in the lower crust is crucial to reveal the occurrence of intraplate earthquakes. Based on the petrological and microstructural analyses for deformed rocks developed in Lofoten and Vesteralen, northern Norway, we revealed that dynamic fracturing is a dominant grain-size reduction mechanism and subsequent grain-size-sensitive creep (e.g., grain-boundary sliding) is a dominant deformation mechanism at high temperatures. Fracturing facilitates fluid flow due to the increased dilatancy and connectivity of pore spaces. An influx of fluid enhances hydration reactions, which form small, strain-free recrystallized grain. This process would promote grain-size-sensitive creep in the narrow zones, and result in the development of ductile shear zones in the lower crust.

Academic Significance and Societal Importance of the Research Achievements

地震発生帯直下の下部地殻が局所的に延性変形すれば,その直上の断層に応力が集中することが期待されるため,地震発生帯直下の下部地殻延性剪断帯の発生・発達過程は,内陸地震の発生において重要である.本研究では,下部地殻剪断帯を詳細に観察できるノルウェー北部ベステローデン諸島において地質調査を行い,採取された変形岩を解析し,動的破壊が下部地殻の延性剪断帯の発生・発達過程において重要であることを明らかにした.

Report

(5 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (39 results)

All 2020 2019 2018 2017 2016 Other

All Journal Article (11 results) (of which Peer Reviewed: 11 results,  Open Access: 4 results,  Acknowledgement Compliant: 3 results) Presentation (23 results) (of which Int'l Joint Research: 7 results,  Invited: 1 results) Book (4 results) Remarks (1 results)

  • [Journal Article] Reversely zoned plagioclase in lower crustal meta-anorthosites: an indicator of multistage fracturing and metamorphism in the lower crust2020

    • Author(s)
      Soda, Y., Matsuda, T., Kobayashi, Y., Ito, M., Harigane, Y. and Okudaira, T.
    • Journal Title

      American Mineralogist

      Volume: 105 Issue: 7 Pages: 1002-1013

    • DOI

      10.2138/am-2020-7284

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Fracturing and Formation of Ductile Shear Zones in the Continental Lower Crust2019

    • Author(s)
      奥平敬元・豊島剛志
    • Journal Title

      Journal of Geography (Chigaku Zasshi)

      Volume: 128 Issue: 5 Pages: 747-760

    • DOI

      10.5026/jgeography.128.747

    • NAID

      130007745841

    • ISSN
      0022-135X, 1884-0884
    • Year and Date
      2019-10-25
    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Crystallographic preferred orientations of plagioclase via grain-boundary sliding in a lower-crustal anorthositic ultramylonite2019

    • Author(s)
      Soda, Y., Harigane, Y., Kajimoto, K. and Okudaira, T.
    • Journal Title

      International Journal of Earth Sciences (Geologische Rundschau)

      Volume: 108 Issue: 6 Pages: 2057-2069

    • DOI

      10.1007/s00531-019-01749-z

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Architecture of onshore fault zones2018

    • Author(s)
      重松紀生・大谷具幸・小林健太・奥平敬元・豊島剛志
    • Journal Title

      The Journal of the Geological Society of Japan

      Volume: 124 Issue: 9 Pages: 759-775

    • DOI

      10.5575/geosoc.2018.0004

    • NAID

      130007530983

    • ISSN
      0016-7630, 1349-9963
    • Year and Date
      2018-09-15
    • Related Report
      2018 Research-status Report 2017 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Microstructural evidence for the deep pulverization in a lower crustal meta-anorthosite2018

    • Author(s)
      Soda Y, Okudaira T
    • Journal Title

      Terra Nova

      Volume: 30 Issue: 6 Pages: 399-405

    • DOI

      10.1111/ter.12355

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Recovering the past history of natural recording media by Bayesian inversion2018

    • Author(s)
      Kuwatani T, Nagao H, Ito SI, Okamoto A, Yoshida K Okudaira T
    • Journal Title

      Physical Review E

      Volume: 98 Issue: 4 Pages: 043311-043311

    • DOI

      10.1103/physreve.98.043311

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Reaction-induced grain boundary cracking and anisotropic fluid flow during prograde devolatilization reactions within subduction zones2017

    • Author(s)
      Okamoto A, Shimizu H, Fukuda JI, Muto J, Okudaira T
    • Journal Title

      Contributions to Mineralogy and Petrology

      Volume: 172 Issue: 9 Pages: 1-23

    • DOI

      10.1007/s00410-017-1393-6

    • Related Report
      2017 Research-status Report
    • Peer Reviewed
  • [Journal Article] Grain size reduction due to fracturing and subsequent grain-size-sensitive creep in a lower crustal shear zone in the presence of a CO2-bearing fluid2017

    • Author(s)
      Okudaira, T., Shigematsu, N., Harigane, Y., Yoshida, K.
    • Journal Title

      Journal of Structural Geology

      Volume: 95 Pages: 171-187

    • DOI

      10.1016/j.jsg.2016.11.001

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Meso-scale brittle deformation structures in and around the Ikoma fault zone2016

    • Author(s)
      Mitamura, K., Okudaira, T., Mitamura, M.
    • Journal Title

      The Journal of the Geological Society of Japan

      Volume: 122 Issue: 2 Pages: 61-74

    • DOI

      10.5575/geosoc.2015.0039

    • NAID

      130005157154

    • ISSN
      0016-7630, 1349-9963
    • Year and Date
      2016-02-15
    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] Geochemical characteristics of hydrous basaltic magmas due to assimilation and fractional crystallization: the Ikoma gabbroic complex, southwest Japan2016

    • Author(s)
      Koizumi, N., Okudaira, T., Ogawa, D., Yamashita, K., Suda, Y.
    • Journal Title

      Mineralogy and Petrology

      Volume: in press Issue: 5 Pages: 1-24

    • DOI

      10.1007/s00710-016-0423-9

    • Related Report
      2016 Research-status Report
    • Peer Reviewed / Acknowledgement Compliant
  • [Journal Article] U-Pb SHRIMP ages of detrital zircons from Hiriyur Formation in Chitradurga greenstone belt and its implication to the Neoarchean evolution of Dharwar craton, South India2016

    • Author(s)
      Nasheeth, A., Okudaira, T., Horie, K., Hokada, T. and Satish-Kumar, M.
    • Journal Title

      Journal of the Geological Society of India

      Volume: 87 Pages: 43-54

    • Related Report
      2016 Research-status Report
    • Peer Reviewed
  • [Presentation] Marker-in-Cell法による圧縮場での地質構造発達シミュレーション:大阪平野における断層の姿勢の推定2019

    • Author(s)
      西脇勇望・奥平敬元・石井和彦
    • Organizer
      日本地質学会第126年学術大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 下部地殻の変形と延性剪断帯の形成2019

    • Author(s)
      奥平敬元・曽田祐介・豊島剛志
    • Organizer
      日本地質学会第126年学術大会
    • Related Report
      2019 Annual Research Report
    • Invited
  • [Presentation] 斜長石の高温細粒化と組成累帯構造: 2. 等温減圧過程での複変成作用による組成累帯構造の形成2019

    • Author(s)
      曽田祐介・奥平敬元
    • Organizer
      日本地質学会第126年学術大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 褶曲した斜長岩マイロナイト中の斜長石定向配列2019

    • Author(s)
      曽田祐介・鍛治本佳亮・針金由美子・奥平敬元
    • Organizer
      日本地質学会第126年学術大会
    • Related Report
      2019 Annual Research Report
  • [Presentation] Formation and development of lower crustal shear zones: A petrological perspective2019

    • Author(s)
      Okudaira T, Soda Y
    • Organizer
      The Second Symposium on Crustal Dynamics (ISCD-2): Toward Integrated View of Island Arc Seismogenesis
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Fracturing of plagioclase grains: Roles for deformation mechanism and fluid pathway at lower crust2019

    • Author(s)
      Soda Y, Okudaira T
    • Organizer
      The Second Symposium on Crustal Dynamics (ISCD-2): Toward Integrated View of Island Arc Seismogenesis
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Fracturing and the development of ductile shear zones in the lower crust2018

    • Author(s)
      Okudaira T, Soda Y, Harigane Y
    • Organizer
      Geophysical Union, Fall Meeting
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Would phase separation be a new grain-size reduction process in the lower crustal conditions?2018

    • Author(s)
      Soda Y, Matsuda T, Kobayashi S, Ito M, Harigane Y, Okudaira T
    • Organizer
      American Geophysical Union, Fall Meeting
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 斜長岩マイロナイト中の褶曲と斜長石ファブリック2018

    • Author(s)
      曽田祐介・岩城航平・鍛治本佳亮・針金由美子・奥平敬元
    • Organizer
      日本地質学会第124年学術大会
    • Related Report
      2018 Research-status Report
  • [Presentation] Pulverization in a meta-anorthosite of a lower crustal shear zone2018

    • Author(s)
      Soda Y, Okudaira T
    • Organizer
      JpGU Meeting 2018
    • Related Report
      2018 Research-status Report
  • [Presentation] 斜長石の高温細粒化と組成累帯構造2018

    • Author(s)
      松田 拓・曽田祐介・小林幸雄・伊藤元雄・針金由美子・奥平敬元
    • Organizer
      日本地質学会第124年学術大会
    • Related Report
      2018 Research-status Report
  • [Presentation] Microstructures related to grain size reduction and exsolution/phase separation in plagioclase under lower crustal conditions2018

    • Author(s)
      Matsuda T, Soda Y, Harigane Y, Okudaira T
    • Organizer
      JpGU Meeting 2018
    • Related Report
      2018 Research-status Report
  • [Presentation] ressure-Temperature-time path inversion from zoned minerals using data assimilation2018

    • Author(s)
      Kuwatani T, Nagao H, Okamoto A, Yoshida K, Ito SI, Okudaira T
    • Organizer
      Asia-Oceania Geosciences Society 15th Annual Meeting (AOGS2018)
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 下部地殻剪断帯における破壊の役割2017

    • Author(s)
      奥平敬元
    • Organizer
      変成岩などシンポジウム
    • Place of Presentation
      大沢温泉,岩手県花巻市
    • Year and Date
      2017-03-19
    • Related Report
      2016 Research-status Report
  • [Presentation] Petrology and geochronology of rocks in and around Chitradurga shear zone: Some insights to the mode and timing of amalgamation of western and eastern Dharwar cratons, South India2017

    • Author(s)
      Nasheeth A, Okudaira T, Hokada T, Horie K, Satish-Kumar M, Ueno Y
    • Organizer
      8th Symposium on Polar Science
    • Related Report
      2017 Research-status Report
  • [Presentation] The role of fracturing on the formation of the lower crustal shear zones2017

    • Author(s)
      Okudaira T
    • Organizer
      JpGU-AGU Joint Meeting 2017
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research
  • [Presentation] 紀伊半島東部の中央構造線の最近の調査結果2017

    • Author(s)
      重松紀生・藤本光一郎・亀高正男・奥平敬元・森 宏
    • Organizer
      日本地質学会第123年学術大会
    • Related Report
      2017 Research-status Report
  • [Presentation] 地殻下部のはんれい岩に見られる斜長石ファブリック2017

    • Author(s)
      曽田祐介・松田 拓・針金由美子・重松紀生・奥平敬元
    • Organizer
      日本地質学会第123年学術大会
    • Related Report
      2017 Research-status Report
  • [Presentation] かんらん岩の25°S OCC深部での変形・変質作用2017

    • Author(s)
      曽田祐介・奥平敬元・水上知行・森下知晃・ウォリス・サイモン
    • Organizer
      InterRidge-Japan研究集会
    • Related Report
      2017 Research-status Report
  • [Presentation] ベイズ推論による鉱物組成累帯構造からの温度-圧力-時間履歴推定の試み2016

    • Author(s)
      桑谷 立・岡本 敦・吉田健太・奥平敬元
    • Organizer
      日本地質学会第122年学術大会
    • Place of Presentation
      日本大学,東京都世田谷区
    • Year and Date
      2016-09-11
    • Related Report
      2016 Research-status Report
  • [Presentation] 下部地殻剪断帯の発達過程:ノルウェー北部Eidsfjord剪断帯2016

    • Author(s)
      奥平敬元・重松紀生・針金由美子・吉田健太
    • Organizer
      日本地質学会第122年学術大会
    • Place of Presentation
      日本大学,東京都世田谷区
    • Year and Date
      2016-09-11
    • Related Report
      2016 Research-status Report
  • [Presentation] Development of lower crustal shear zones: Examples from Norway, Antarctica, Pakistan and Japan2016

    • Author(s)
      Okudaira T, Toyoshima T
    • Organizer
      International Symposium on Crustal Dynamics 2016: Unified understanding of geodynamic processes at different time and length scale
    • Place of Presentation
      高山市民文化会館,岐阜県高山市
    • Year and Date
      2016-07-21
    • Related Report
      2016 Research-status Report
    • Int'l Joint Research
  • [Presentation] 地殻下部における剪断帯の発達様式:ノルウェー北部,Eidsfjord剪断帯2016

    • Author(s)
      奥平敬元・重松紀生・針金由美子
    • Organizer
      地球惑星科学連合2016年大会
    • Place of Presentation
      幕張国際会議場,千葉県千葉市美浜区
    • Year and Date
      2016-05-23
    • Related Report
      2016 Research-status Report
  • [Book] 鉱物・宝石の科学事典2019

    • Author(s)
      Wallis, S.R.・奥平敬元・豊島剛志
    • Total Pages
      664
    • Publisher
      朝倉書店
    • Related Report
      2019 Annual Research Report
  • [Book] 地球大百科事典(上巻)2019

    • Author(s)
      奥平敬元
    • Total Pages
      600
    • Publisher
      朝倉書店
    • Related Report
      2019 Annual Research Report
  • [Book] 地球大百科事典(下巻)2019

    • Author(s)
      奥平敬元
    • Total Pages
      816
    • Publisher
      朝倉書店
    • Related Report
      2019 Annual Research Report
  • [Book] The Geology of Japan2016

    • Author(s)
      Wallis, S.R. and Okudaira, T.
    • Total Pages
      522
    • Publisher
      Geological Society, London
    • Related Report
      2016 Research-status Report
  • [Remarks] Takamoto Okudaira's HP

    • URL

      http://www.sci.osaka-cu.ac.jp/geos/geo2/okudaira.html

    • Related Report
      2018 Research-status Report

URL: 

Published: 2016-04-21   Modified: 2021-02-19  

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