Deformations of the coastal Pilbara Terrane, Western Australia

• Kiyokawa Shoichi

  National Science Museum

• Taira Asahiko

  Univ. of Tokyo

• Byrne Tim

  Univ. of Connecticut

Bibliographic Information

Other Title

• —an example of continental growth and evolution evidence at an Archean continental crust—

Abstract

The middle Archean (3.25-3.20Ga) coastal Pilbara Terrane was formed by an immature oceanic island arc-continent collision [D₁: 3.15-3.05Ga] and was deformed by regional intraplate strike-slip deformations [D₂: 3.0-2.95Ga; D₃: 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). D₁ 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 D₂ event identified regional strike-slip deformations (eg. reactivated quartz mylonite, steep axis asymmetric fold) and the D₃ 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.

Journal

• The Journal of the Geological Society of Japan

  The Journal of the Geological Society of Japan 105 (1), I-II, 1999

  The Geological Society of Japan

Keywords

• General Earth and Planetary Sciences
• General Engineering
• General Environmental Science

Details

• CRID: 1390282681215161088
• NII Article ID: 10002630876
• NII Book ID: AN00141768
• DOI: 10.5575/geosoc.105.i
• ISSN: 13499963
• ISSN: 00167630
• Text Lang: en
• Data Source:
  • JaLC
  • Crossref
  • CiNii Articles
• Abstract License Flag: Disallowed