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Archean Tectonics of the Pilbara craton, Western Australia

Research Project

Project/Area Number 06041038
Research Category

Grant-in-Aid for international Scientific Research

Allocation TypeSingle-year Grants
SectionField Research
Research InstitutionTOKYO INSTITUTE OF TECHNOLOGY

Principal Investigator

ISOZAKI Yukio  Tokyo Institute of Technology, 理学部, 助教授 (90144914)

Co-Investigator(Kenkyū-buntansha) TERABAYASHI Masaru  Kagawa University, 教育学部, 助手 (40243745)
KATO Yasuhiro  Yamaguchi University, 理学部, 助手 (40221882)
KIMURA Gaku  University of Osaka Prefecture, 総合科学部, 教授 (80153188)
MARUYAMA Shigenori  Tokyo Institute of Technology, 理学部, 教授 (50111737)
Project Period (FY) 1994
Project Status Completed (Fiscal Year 1994)
Budget Amount *help
¥4,500,000 (Direct Cost: ¥4,500,000)
Fiscal Year 1994: ¥4,500,000 (Direct Cost: ¥4,500,000)
Keywordsaccretionary complex / chert / MORB / BIF / OIB / hydrothermal activity / plume / orogenic belt
Research Abstract

Archean (3.5-2.5 Ga) sedimentary rocks in the Pilbara craton, Western Australia, have been regarded as succesive sequences accumulated in situ on continetal crust. Present research project has clarified, however, that these Archean sedimentary complexes are ancient accretionary complexes formed at subduction zones. Detailed field research was conducted in the Cleaverville, North Pole, Marble Bar, Camel Creek, and Beasley River areas in the granite/greenstone belts of the Pilbara craton, and following results were newly obtained.
Recognition of duplex structure and oceanic plate stratigraphy of component rocktypes proved the occurrence of Archean acrretionary complex. This find indicates that plate tectonics including subduction of oceanic plate was working already at 3.5 Ga (mid-Archean time), and that the Archean granite/greenstone belt represents subduction-related Cordilleran-type orogenic belt. Furthermore, it implies that Archean granite/greensone belts in other cratons can be all … More re-interpreted as Cordilleran-type orogenic belts.
On the other hand, some peculiar characteristics of Archean accretionary complex can be documented as follows ; 1) Archean MORB in accretionary complex is fairly thicker than those in Phanerozoic equivalents, 2) occurence of komatiitic greenstones which is absent in Phanerozoic example, and 3) metalliferous pelagic sediments including barite deposits. What was also clarified is a considerable variation in Archean accretionary complexes including komattitic grenstone (probably of oceanic plateau origin) -dominant complex, and those with strong alteration by hydrothermal venting associated with barite units. In addition, the so-called oldest (3.5 Ga) stromotolite was revealed to be a deep-sea hydrothermal deposits associated with barite.
The above-mentioned results are all new to this study field, and the present project team is now trying to publish these in international journals as soon as possible. We would like to appreciate the Ministry of education and culture of Japan for the support on this project. Less

Report

(1 results)
  • 1994 Final Research Report Summary
  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] 磯崎行雄・丸山茂徳: "地球史柱状図計画" 月刊地球. 号外NO.10. 20-25 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 丸山茂徳・熊沢峰夫 磯崎行雄・瀬野徹三: "新地球史概説" 月刊地球. 号外NO.10. 14-19 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 丸山茂徳: "マントルの進化をよむ-全地球史解読-" 月刊地球. vol.17,NO.3. 133-135 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 太田宏,丸山茂徳,磯崎行雄: "過去の造山帯中に産する火山岩からマントルの進化を読む試み" 月刊地球. vol.17,NO.3. 164-170 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 加藤泰浩・大田泉・恒松知樹: "太古代付加体の構成堆積岩の地球科学-海水-大陸の進化を読む試み-" 月刊地球. vol.17,NO.3. 173-178 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Y.Isozaki: "Superanoxia across the Permo-Triassic boundary recorded in pelagic chert in Japan." Canadian Society of Petroleum Geologists Memoir. no.17. 805-812 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] 阿部豊,田近英一,有馬眞,中雄一,柳川弘志,丸山茂徳,小出良幸,平田大二: "新しい地球史46億年の謎" 有隣堂, 213 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Y.Isozaki, S.Maruyama: "Project "Earth History Column"" Earth Monthly. Spec.vol.10. 20-25 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] S.Maruyama, M.Kumazawa, Y.Isozaki and T.Seno: "A New Summary of Earth History" Earth Monthly. Spec.vol.10. 14-19 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] S.Maruyama: "To read mantle evolution-decording Earth History-" Earth Monthly. 17. 133-135 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] H.Ohta, S.Maruyama and Y.Isozaki: "Reading mantle evolution through volcanic rocks in ancient orogen." Earth Monthly. 17. 164-170 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Y.Kato, I.Ohta and T.Tsunematsu: "Geochemistry of Archean sediments in accretionary complex." Earth Monthly. 17. 173-178 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Y.Isozaki: "Superanoxia across the Permo-Triassic boundary recorded in pelagic chert in Japan" Canadian Society of Petroleum Geologists Memoir. 17. 805-812 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary
  • [Publications] Y.Abe, E.Tajika, M.Arima, Y.Naka, H.Yanagawa, S.Maruyama, Y.Koide and D.Hirata: "New edition of Earth History : Conundrum of 4.6 billion year history" Yu-rindo Publ.Co.1-213 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1994 Final Research Report Summary

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Published: 1994-04-01   Modified: 2016-04-21  

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