Deformations of the coastal Pilbara Terrane, Western Australia -an example of continental growth and evolution evidence at an Archean continental crust-

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The middle Archean (3.25-3.20Ga) coastal Pilbara Terrane was formed by an immature oceanic island arc-continent collision [D<sub>1</sub>: 3.15-3.05Ga] and was deformed by regional intraplate strike-slip deformations [D<sub>2</sub>: 3.0-2.95Ga; D<sub>3</sub>: 2.90-2.80Ga] (Kiyokwa and Taira, 1999; Kiyokawa et al., submit). The immatured oceanic island arc unit of the Cleaverville-Roebourne Supercomplex tectonically overthrusts the granitecontinental shelf metasedimentary Karratha Supercomplex (see cross section) (Kiyokawa and Taira, 1998). D<sub>1</sub> thrust deformation evidences, such as klippen structure, imbricated thrust piles and a basal decollement with quartz mylonite, are well preserved in the complexes boundary. On the other hand, the D<sub>2</sub> event identified regional strike-slip deformations (eg. reactivated quartz mylonite, steep axis asymmetric fold) and the D<sub>3</sub> deformation locally preserved at the terrane boundary with mylonite shear zone [Sholl shear zone]. These deformations are identified as formation of a juvenile continent and stabilization of early continent in Middle Archean.

収録刊行物

  • 地質學雜誌  

    地質學雜誌 105(1), 1-11, 1999-01 

    The Geological Society of Japan

各種コード

  • NII論文ID(NAID)
    10002630876
  • NII書誌ID(NCID)
    AN00141768
  • 本文言語コード
    ENG
  • 資料種別
    OTR
  • ISSN
    00167630
  • データ提供元
    CJP書誌  J-STAGE 
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