地質学雑誌
Online ISSN : 1349-9963
Print ISSN : 0016-7630
ISSN-L : 0016-7630
Deformations of the coastal Pilbara Terrane, Western Australia
—an example of continental growth and evolution evidence at an Archean continental crust—
Shoichi KiyokawaAsahiko TairaTim Byrne
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ジャーナル フリー

1999 年 105 巻 1 号 p. I-II

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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.
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© The Geological Society of Japan
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