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Geochronology of paleo-earthquake -dating of fault materials by earthquake-

Research Project

Project/Area Number 11440151
Research Category

Grant-in-Aid for Scientific Research (B).

Allocation TypeSingle-year Grants
Section一般
Research Field Geology
Research InstitutionOkayama University of Science

Principal Investigator

ITAYA Tetsumaru  Okayama University of Science, Research Institute of Natural Sciences, Professor, 自然科学研究所, 講師 (60148682)

Co-Investigator(Kenkyū-buntansha) TOYODA Shin  Okayama University of Science, Faculty of Science, Lecturer, 理学部, 講師 (40207650)
NINAGAWA Kiyotaka  Okayama University of Science, Faculty of Science, Associate Professor, 理学部, 助教授 (80098590)
HYODO Hironobu  Okayama University of Science, Research Institute of Natural Sciences, Lecturer, 自然科学研究所, 講師 (50218749)
TANAKA Hideo  Ehime University, Faculty of Science, Research Associate, 理学部, 助手 (40236625)
Project Period (FY) 1999 – 2000
Project Status Completed (Fiscal Year 2000)
Budget Amount *help
¥9,600,000 (Direct Cost: ¥9,600,000)
Fiscal Year 2000: ¥3,200,000 (Direct Cost: ¥3,200,000)
Fiscal Year 1999: ¥6,400,000 (Direct Cost: ¥6,400,000)
Keywordsearthquake / fault materials / fault gouge / mica-clay minerals / K-Ar method / Ar-Ar method / TL method / ESR method / 年代測定 / 放射線損傷法 / 断層 / シュードタキライト
Research Abstract

This is to date the materials formed during fault movement accomapnied with paleo-earthquakes by K-Ar, Ar-Ar and radiation damage methods after the identification of fault rocks formed by earthquakes.
In order to estimate natural radiation level in TL and ESR dating, a portable γ-ray meter was purchased. We also constructed the automated laser step heating system for Ar-Ar dating of single mineral grain.
Many structural geologists supported us for sampling of fault rocks, mainly pseudotachlytes from Oshima of Ehime Prefecture and fault gouges from Atotsugawa, Hatagawa, Tasuke and Tanakura systems in Japan, and from MCT in Nepal and Yangsan fault in Korea.
Oshima pseudotachlytes and their host metamorphic rocks were dated with the Ar/Ar spot daing method using a pulsed laser. The later results give 100-110Ma for amphiboles and the former, 60-80Ma. The ages of gouges are about 3Ma for the Nepal MCT, 40-50Ma for the Tanakura, 38-46Ma for the Yangson. In the Atotsu system, the ages become younger with decreasing grain size of separates from granites. This tendency is not observed in the separates from sedimentary rocks. However, the ages are about 60Ma.
We examined the discordant age relations due to K ion trapped in the expanded layers of smectite When K ion is exchanged by NH4 ion, the ages get 2-5% older than those of the original smectite.
We have published more than 20 papers on the results of this project and the related subjects.

Report

(3 results)
  • 2000 Annual Research Report   Final Research Report Summary
  • 1999 Annual Research Report
  • Research Products

    (32 results)

All Other

All Publications (32 results)

  • [Publications] Nishimura,Y.,Coombs,D.S.,Landis,C.A.and Itaya,T.: "Continuous metamorphic gradient documented by graphitization and K-Ar age, southeast Otago, New Zealand."American Mineralogist. 82. 1625-1636 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Nam,Y.N.,Hyodo,H.,Itaya,T.and Matasuda,T.: "Early Proterozoic tectonothermal event south of the red river shear zone in Vietnam : First evidence from 40Ar/39Ar dating of single grain hornblende."Viet.Nat.Univ.J.Sci.Nat.Sci.. 16. 26-34 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] 兵藤博信,板谷徹丸,松田高明: "レーザーマイクロプローブ40Ar/39Ar年代測定"地学雑誌. 109巻6号. 827-835 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Ninagawa,K.,Kitahara,T.,Toyoda,S.and otthers: "Thermoluminescence dating of the Ryukyu Limestone"Quatern.Sci.Rev.. 20. 829-833 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Toyoda,S.,Rink,WJ.,Yonezawa,C.and Kagami,T.: "In-situ production of alpha particles and alpha recoil particles in quartz applied to ESR studies of oxygen vacancies."Quatem.Sci.Rev.. 20. 1057-1061 (2001)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Tanaka,H.,Fujimoto,K.,Ohtani,T.and Ito,H.: "Role of each shear zone in a fault zone during seismic cycles, clarified by structural and chemical characterization of fault rocks along the GSJ core penetrating."Journal of Geophysical Research. (印刷中).

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Nishimura, Y., Coombs, D.S., Landis, C.A.and Itaya, T.: "Continuous metamorphic gradient documented by graphitization and K-Ar age, southeast Otago, New Zealand."American Mineralogist. 85. 1625-1636 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Nam, T.N., Hyodo, H., Itaya, T.and Matasuda, T.: "Early Proterozoic tectonothermal event south of the red river shear zone in Vietnam : First evidence from 40Ar/39Ar dating of single grain hornblende."Viet.Nat.Univ.J.Sci.Nat.Sci.. 16. 26-34 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Hyodo, H., Kim, S., Itaya, T.and Matsuda, T.: "Homogeneity of neutron flux during irradiation for 40Ar/39Ar age dating in the research reactor at Kyoto University."Jour.Min.Pet.Econ.Geol.. 94(9). 329-337 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Itaya, T.and Fujino, M.: "K-Ar age - chemistry - fabric relations of phengite from the Sanbagawa high pressure schists, Japan."The Island Arc. 8. 523-536 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Tsujimori, T.and Itaya, T.: "Blueschist-facies metamorphism during Paleozoic orogeny in southwestern Japan : Phengite K-Ar ages of blueschist-facies tectonic blocks in a serpentinite melange beneath early Paleozoic Oeyama ophiolite."The Island Arc.. 8. 190-205 (1999)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Toyoda, S., Rink, WJ., Yonezawa, C and Kagami, T.: "In-situ production of alpha particles and alpha recoil particles in quartz applied to ESR studies of oxygen vacancies."Quatern.Sci.Rev.. 20. 1057-1061 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Ninagawa, K., Kitahara, T., Toyoda, S., Hayashi, K., Nishido, H., Kinjo, M.. and T.Kawana.: "Thermoluminescence dating of the Ryukyu limestone."Quatern.Sci.Rev.. 20. 829-833 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Toyoda, S., Rink, WJ, Schwarcz, HP and Rees-Jones, J: "Crushing effects on TL and OSL on quartz : relevance to fault dating"Radiat.Meas.. 32. 667-672 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Toyoda, S, Voinchet, Falgu res, C., Dolo, JM.and Laurent, M: "Bleaching of ESR signals by the sunlight : a laboratory experiment for establishing the ESR dating of sediments."Appl.Radiat.Isot.. 52. 1357-1362 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Toyoda, S.and Hattori, W.: "Formation and decay of the E1'center and of its precursor."Appl.Radiat.Isot.. 52. 1351-1356 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Shigematsu, N.and Tanaka, H.: "Dislocation creep of fine grained recrystallized plagioclase under low temperature conditions."Journal of Structural Geology. 22. 65-79 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Ohtani, T., Fujimoto, K., Ito, H., Tanaka, H., Higuchi, T.and Tomida, N.: "Fault Rocks and Paleo- to Recent Fluid Characteristics from the Borehole Survey of the Nojima Fault ruptured in the 1995 Kobe earthquake, southwest Japan."Journal of Geophysical Research. 105. 16161-16171 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Tanaka, H., Hinoki, Kosaka, K., Lin, A., Takemura, K., Murata, A.and Miyata, T.: "Deformation mechanisms and fluid behavior in a shallow, brittle fault zone during coseismic and interseismic periods : results from drilling cores penetrating the Nojima fault, Japan."Island Arc. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Tanaka, H., Fujimoto, K., Ohtani and, T.and Ito, H.: "Role of each shear zone in a fault zone during seismic cycles, clarified by structural and chemical characterization of fault rocks along the GSJ core penetrating the Nojima fault, Awaji Island, southwest Japan."Journal of Geophysical Research. (in press).

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2000 Final Research Report Summary
  • [Publications] Nishimura,Y.,Coombs,D.S.,Landis,C.A.and Itaya,T.: "Continuous metamorphic gradient documented by graphitization and K-Ar age, southeast Otago, New Zealand."American Mineralogist. 82. 1625-1636 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Nam,T.N.,Hyodo,H,Itaya,T.and Matasuda,T.: "Early Proterozoic tectonothermal event south of the red river shear zone in Vietnam : First evidence from 4OAr/39Ar dating of single grain hornblende."Viet.Nat.Univ.J.Sci.Nat.Sci.. 16. 26-34 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] 兵藤博信,板谷徹丸,松田高明: "レーザーマイクロプローブ40Ar/39Ar年代測定"地学雑誌. 109巻6号. 827-835 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] Ninagawa,K,Kitahara,T.,Toyoda,S.and otthers: "Thermoluminescence dating of the Ryukyu Limestone"Quatern.Sci.Rev.. 20. 829-833 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Toyoda,S.,Rink,WJ.,Yonezawa,C.and Kagami,T.: "In-situ production of alpha particles and alpha recoil particles in quartz applied to ESR studies of oxygen vacancies."Quatern.Sci.Rev.. 20. 1057-1061 (2001)

    • Related Report
      2000 Annual Research Report
  • [Publications] Tanaka,H.,Fujimoto,K,Ohtani,T.and Ito,H.: "Role of each shear zone in a fault zone during seismic cycles, clarified by structural and chemical characterization of fault rocks along the GSJ core penetrating."Journal of Geophysical Research. (印刷中).

    • Related Report
      2000 Annual Research Report
  • [Publications] Itaya.T.and Fujino,M.: "K-Arage-chemistry-fabric relations of phengite from the Sanbagawa high pressure schists,japan"The Island Arc. 8. 523-536 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Tsujimori,T. and Itaya, T: "Blueschist-facies metamorphism during Paleozoic orogeny in southwestern Japan"The Island Arc. 8. 190-205 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] Hyodo,H.,Kim,S.,Itaya,T. and Matsuda,T.: "Homogeneity of neutron flux during irradiation for ^<40>Ar/^<39>Ar age dating in the research reactor at Kyoto University"Jour,Min,Pet,Econ,Geol. 94(9). 329-337 (1999)

    • Related Report
      1999 Annual Research Report
  • [Publications] S.Toyoda,P.Voinchet,C,Falgu res,: "Bleaching of ESR signals by the sunlight ; a laboratory experiment for establishing the ESR dating of sediments"Appl.Radiat.Isot.. (in press). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] S.Toyoda and W.hattori: "Formation and decay of the E1' center and of its precursor"Appl.Radiat.Isot.. (in press). (2000)

    • Related Report
      1999 Annual Research Report
  • [Publications] W.J.Rink,S.Toyoda,J.Rees-Jones,: "Thermal activation of OSL as a geothemometer for quartz grain heating during fault movements"Radiat.Meas.. 30. 97-105 (1999)

    • Related Report
      1999 Annual Research Report

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Published: 1999-04-01   Modified: 2016-04-21  

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