OKUDAIRA Takamoto

写真a

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Title

Professor

Laboratory location

Sugimoto Campus

Degree 【 display / non-display

  • Hiroshima University -  PhD

  • Hiroshima University -  Master of Science

Research Areas 【 display / non-display

Geology, Mineralogy, Petrology and Resource Geology

Research subject summary 【 display / non-display

  • Understanding the crustal dynamics based on chemical and microstructural analyses of minerals

Research Interests 【 display / non-display

Crustal dynamics, Structural petrology, Metamorphic petrology

Research Career 【 display / non-display

  • Formative process and develpment of fault-related rocks

    (Collaboration in Japan) Project Year :

    2002.04
     
     

    Keyword in research subject:  fault, deformation, earthquake

  • Kinetics of Metamorphic Crystallization

    (Individual)

    Keyword in research subject:  Metamorphism, Kinetics

  • interaction between deformation and metamorphism

    (Individual)

    Keyword in research subject:  reaction weakening, pressure-solution creep, mass transfer

  • Evolutional processes of Continental Lower Crust

    (Individual)

    Keyword in research subject:  Continents, Lower Crust

Association Memberships 【 display / non-display

  • Geological Society of Japan

  • Japanese Association of Mineralogical Sciences

  • American Geophysical Union

  • Japan Geoscience Union

Committee Memberships 【 display / non-display

  • 2010
    -
    2012

    Geological Society of Japan   Director

  • 2009
    -
    2013

    Geological Society of Japan  

  • 2006
    -
    2016

    Geological Society of Japan   Delegate

  • 2006
    -
    2012

    Geological Society of Japan  

  • 2005
    -
    Today

    Geological Society of Japan  

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Current Career 【 display / non-display

  • Osaka City University   Graduate School of Science   Biology and Geosciences Course   Professor  

Career 【 display / non-display

  • 2007
     
     

    Osaka City University  

  • 1997
     
     

    Osaka City University  

  • 1997
     
     

    Osaka City University  

  • 1996
    -
    1997

    JMPS  

Graduate School 【 display / non-display

  •  
    -
    1995

    Hiroshima University  Graduate School, Division of Natural Science 

Graduating School 【 display / non-display

  •  
    -
    1990

    Aichi University of Education   Faculty of Education   Department of Earth Sciences

 

Published Papers 【 display / non-display

  • 大陸下部地殻における破壊と延性剪断帯の形成

    奥平敬元・豊島剛志

    地学雑誌  128   in press 2019  [Refereed]

  • Microstructural evidence for the deep pulverization in a lower crustal meta-anorthosite

    Soda Yusuke, Okudaira Takamoto

    Terra Nova  30 ( 6 ) 399 - 405 2018.12  [Refereed]

    DOI

  • Recovering the past history of natural recording media by Bayesian inversion

    Kuwatani Tatsu, Nagao Hiromichi, Ito Shin-ichi, Okamoto Atsushi, Yoshida Kenta, Okudaira Takamoto

    PHYSICAL REVIEW E  98 ( 4 )  2018.10  [Refereed]

    DOI

  • 陸域断層の内部構造

    重松紀生・大谷具幸・小林健太・奥平敬元・豊島剛志

    地質学雑誌  124 ( 9 ) 759 - 775 2018.09  [Refereed]

  • Reaction-induced grain boundary cracking and anisotropic fluid flow during prograde devolatilization reactions within subduction zones

    Okamoto Atsushi, Shimizu Hiroyuki, Fukuda Jun-ichi, Muto Jun, Okudaira Takamoto

    CONTRIBUTIONS TO MINERALOGY AND PETROLOGY  172 ( 9 )  2017.09  [Refereed]

    DOI

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Books etc 【 display / non-display

  • 地球大百科事典(地質・岩石編)

    奥平敬元 (Part: Single Work )

    朝倉書店  2019

  • 鉱物・宝石の科学事典

    Wallis SR・奥平敬元・豊島剛志 (Part: Single Work )

    朝倉書店  2018

  • Paired metamorphic belts in SW Japan: the geology of the Sanbagawa and Ryoke metamorphic belts and the Median Tectonic Line

    Wallis, S.R. and Okudaira, T. (Part: Joint Work )

    The Geology of Japan (eds. T. Moreno, S. Wallis, T. Kojima and W. Gibbons), Geological Society, London  2016

  • The Geology of Japan

    奥平 敬元 (Part: Single Work )

    Geological Society, London  2016

  • 日本の地質構造100選

    奥平敬元・小泉奈緒子・宮崎智美 (Part: Single Work )

    朝倉書店  2012

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Review Papers (Misc) 【 display / non-display

Conference Activities & Talks 【 display / non-display

  • 溶液-沈殿クリープに関連する水の分布とその拡散性

    福田 惇一, 奥平 敬元

    日本鉱物科学会年会講演要旨集  2011.09 

  • O-93 秋田県出羽丘陵鳥田目断層群に関連する新第三系の変形構造(9.地域地質・地域層序,口頭発表,一般講演)

    吉田 昌幸, 西川 治, 奥平 敬元, 白石 建雄

    日本地質学会学術大会講演要旨  2008.09 

  • S-38 近畿地方の第四紀テフラ層序に基づく大規模爆発的噴火の頻度((4)大規模カルデラ火山-構造・噴火-堆積プロセス・長期予測,口頭発表,シンポジウム)

    長橋 良隆, 小林 聡子, 奥平 敬元, 吉川 周作, 吉田 武義

    日本地質学会学術大会講演要旨  2007.09 

  • O-132 秋田県出羽丘陵における硬質泥岩の変形機構と変形条件(13.岩石・鉱物の破壊と変形,口頭発表,一般講演)

    西川 治, 伊藤 慶彦, 白石 建雄, 奥平 敬元

    日本地質学会学術大会講演要旨  2007.09 

  • O-230 西南日本領家変成帯の層状メタチャートの変形構造(20.変成岩とテクトニクス,口頭発表,一般講演)

    別府 裕樹, 奥平 敬元

    日本地質学会学術大会講演要旨  2007.09 

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Other Research Activities (Works) 【 display / non-display

  • Deformotion mechanism of the granitic and matic mylonite in the ductile shear Zone

    1998
     
     
  • Petrological Study of the high-grade gneiss in the Eastern Ghat, India

    1997
     
     
  • Petrological Study on the Kaizuki-yama contact metarorphic belt in the Kasuga-mura, Gitu Prefecture

    1996
     
     
  • Geological and petrologicul Studies on the Ryoke metamorphic belt in the Yanai district, Yamaguchi Prefecture

    1990
     
     

Grant-in-Aid for Scientific Research 【 display / non-display

  • Arsenic and its transformation of chemical form in the cycle of crust and hydrosphere

    Project/Area Number : 17H01863  Grant-in-Aid for Scientific Research(B) Partaker / Other

    Project Year :

    2017.04
    -
    2020.03
     

  • Investigation of fault development and crustal structure from microscopic to macroscopic scales based on geological and seismic observations

    Project/Area Number : 26109004  Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area) Partaker / Other

    Project Year :

    2014.07
    -
    2019.03
     

  • Establishment of unified logic of arsenic contaminated groundwater formation process in Neogene sediments of Asia

    Project/Area Number : 21241005  Grant-in-Aid for Scientific Research(A) Partaker / Other

    Project Year :

    2009
    -
    2012
     

    Partaker : MITAMURA Muneki, OKUDAIRA Takamoto, SHINODA Keiji, NISHIKAWA Yoshikazu

     View Summary

    Formation mechanism of arsenic-contaminated groundwater, extending in Asian countries, was studied in Bangladesh, Pakistan and Vietnam. In the field of Bangladesh, As-bearing chlorite was the primary source, and it released As into groundwater at the uppe

  • Deformation mechanism of rocks of the Ryoke metamorphic belt as deep process of the inland earthquakes

    Project/Area Number : 19540485  Grant-in-Aid for Scientific Research(C) Representative

    Project Year :

    2007
    -
    2009
     

     View Summary

    To clarify the deep process of inland earthquakes, we studied the deformation mechanism of rocks that had deformed at the middle crustal depth. Based on results of the structural petrological analysis on rocks of the Ryoke metamorphic belt, an ancient metamorphosed accretionary complex, we revealed that the dominant deformation mechanism of quartzose rocks could be diffusion creep or grain-size-sensitive creep instead of dislocation creep. Since viscosity of rocks deformed by diffusion creep would be three orders magnitude smaller than by dislocation creep, crustal strength for the new crustal model proposed by this study would be weaker than that for the classical model with the crust deformed by dislocation creep. The results of the study provided the new insight on studies for seismogenic process and crustal rheology.

  • Clarify on the formation mechanism of arsenic contaminated groundwater in the alluvial plain of Bangladesh

    Project/Area Number : 15403017  Grant-in-Aid for Scientific Research(B) Partaker / Other

    Project Year :

    2003
    -
    2006
     

    Partaker : MASUDA Harue, AKAI Junji, CHIBA Hitoshi, NAKAYA Shinji

     View Summary

    Continuous sediment core samples and groundwaters were collected in the northern part of Sonargaon, Narayanganj, Bangladesh in the Ganges-Brahmaputra Delta in order to figure out the geological structure of the As-contaminated groundwater aquifers. The study area spans the alluvial plain and the Pleistocene terrace. The Quaternary strata in this area are divided into the Plio-Pleistocene sand, Upper Pleistocene mud, and Holocene sand units in the ascending order. The upper surface of the Upper Pleistocene mud unit are partly eroded and formed depression or valley where the Holocene sand unit is thicker than the surroundings and As-contamination is very high. The uppermost part of the lower aquifer in the Pleistocene terrace deposits was laterized reddish sediments, bordering the overlying impermeable mud unit. The groundwater in this aquifer preserves the oxidizing conditions with almost arsenic free nature. Highly As-contaminated groundwater is found in the upper aquifer in the Holocene sand unit filling in the alluvial plain. Highly As contaminated groundwater appears closely related to the silt to fine sand lenses, and As free groundwater can be obtained from where only sandy sediments comprising coarser than medium sand fraction were recovered in the sediment column. Such a limited occurrence of highly As contaminated groundwater suggests that the contamination occurs during vertical infiltration of groundwater through silt to fine sand lens along or around the installed well tubes due to excess use of the groundwater.

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Charge of on-campus class subject 【 display / non-display

  • Petrology I

    (2018) University, Special course

  • Exercise in Petrology I

    (2018) University, Special course

  • Geodynamics

    (2018) University, Special course

  • Tectonics

    (2018) University, Special course

  • Geological Survey Method I, II and III

    (2018) University, Special course

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