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Accretion-Collision Tectonics of Sakhalin and Circum-Pacific Orogeny

Research Project

Project/Area Number 03041059
Research Category

Grant-in-Aid for Overseas Scientific Survey.

Allocation TypeSingle-year Grants
SectionField Research
Research InstitutionNiigata University

Principal Investigator

MIYASHITA Sumio  Niigata Univ., Dept. of Geology & Mineralogy, Associate Professor, 理学部, 助教授 (60200169)

木村 学  香川大学, 教育学部, 助教授

Co-Investigator(Kenkyū-buntansha) MELINIKOV M.  Sakhalin Institute of Geology and Geothysics Research Staff, 研究員
ROZHDESTVENSKIY O.  Sakhalin Institute of Geology and Geothysics Research Staff, 研究員
SERGEYEV K. F.  Sakhalin Institute of Geology and Geothysics Director, 所長
SAKAKIBARA Masayuki  Ehime Univ., Dept. of Earth Science, Assistant, 理学部, 助手 (80202084)
ISHIZUKA Hideo  Kochi Univ., Dept. of Geology, Associate Professor, 理学部, 助教授 (00142349)
OKAMURA Makoto  Kochi Univ., Dept. of Geology, Associate Professor, 理学部, 助教授 (10112385)
KIMURA Gaku  Kagawa Univ., Dept. of Geology, Associate Professor, 教育学部, 助教授 (80153188)
Project Period (FY) 1991
Project Status Completed (Fiscal Year 1991)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 1991: ¥3,500,000 (Direct Cost: ¥3,500,000)
KeywordsAccretionary complex / Cretaceous / Blueschists / Susunai / Aniba / Sakhalin
Research Abstract

The results obtained from this project are summarized as follows. 1) The Cretaceous accretionary complexes, called the Aniba complex, are composed of two tectonic units. The upper unit consisting of basalts, bedded cherts, hemipelagec siliceous shale, Melange, and terrigenous sediments in ascending order, thrust over thd lower the unit which is composed of dominant basalts and melanges characterized by abundant limestone blocks. The lower unit composing of five thrust sheets verging eastward, seems to be an underplating complex beneath the upper unit. 2) The Susunai complexes, high pressure metamorphic ones extending to the Kamuikotan metamorphic belt in Hokkaido, reveal a complete sequence of the tectonic pile composed of tens of thrust sheets which are stacked by low angle thrusts verging southward. The complexes consist mainly of greenschists, metachert, silicious shist, and metapelites associated with metagreywackes. The complex is divided into five domains based on lithologic assemblages. For example, Domain 4 is characterized by dominant basalts to dolerites overlain by basaltic sediments with pelagic limestones capped by a thin sequence of black shale. Three phases of deformation, D1 to D3 are discriminated. The rocks subjected the highest strain of D2, strongest deformation among them, show NE trending asymmetric folds, NW trending sheath folds and lineation of both the stretching and micro folding. Two metamorphic zones are defined in the surveyed areas, i. e. pumpellyite-actionlite zone in southern part and pumpellyite-epidote-actionlite zone in northern part. The P-T conditions at the peak of metamorphism are estimated to have been 200-300゚C and 4-5Kbar. The metamorphism coincides with D2 phase of deformation. 3) Major and minor element compositions of basaltic rocks exhibit that those from the Aniba complex represent oceanic island tholeiites features and alkaline affinity, whereas those from the Susunai complex reveal N-MORB to T-MORB features

Report

(1 results)
  • 1991 Final Research Report Summary
  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] Kimura,G.: "Mode of Mixture of oceanic fragments and terrigencus trench fill in an accretionary complex:example from southeum Sakhalin" Tectonophysics. 201. (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Kimura,G.: "A deep section of accretionary complex-Susnai complex in the island of Sakhalin,NW Pacific margin-" Island Arc.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Kimura,G.: "Huge Jurassic oceanic plateau-the Sorachi Pleateau-accreted to the northwestern Pacific margin" Tictonics.

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 田中 久雄: "ソ連カムチャッカ半島東北部オリュ-トル地域の深成岩類" 岩鉱. 87. 1-11 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] 宮下 純夫: "下川オフィオライトにおける鉱物の異常構造に関する予察的研究" 新潟大学理学部地質学鉱物学教室研究報告. 7. 85-101 (1992)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Kimura, G.: "Mode of mixture of oceanic fragments and terrigenous trench fill in an accretionary complex : example from southern Sakhalin" Tectnophysics. 201. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Kimura, G.: "A deep section of accretionary complex-Susunai complex in the island of Sakhalin, NW Pacific margin-" Island Arc. 1. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Kimura, G.: "Huge Jurassic oceanic plateau-the Sorachi Plateau-accreted to the northwestern Pacific margin" Tectonics. (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Tanaka, H.: "Plutonic rocks in the Olyutor Range, northeastern Kamchatka, USSR" Journal of Mineralogy, Petrology and Economic Geology. 87. 1-11 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary
  • [Publications] Miyashita, S.: "A preliminary study on the zonings of plagioclase and clinopyroxene from the Shimokawa ophiolite, northen Hidaka zone, Hokkaido" Contrib. Dept. Geol. Min., Niigata Univ.7. 85-101 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1991 Final Research Report Summary

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Published: 1991-04-01   Modified: 2016-04-21  

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