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Terranes of the Wonominta Block, Far Western New South Wales

Leitch, E. C ; Webby, B. D ; Mills, K. J ; Kolbe, P Leitch, Evan C ; Scheibner, Erwin

Terrane Accretion and Orogenic Belts, 1987, p.31-37 [Revista revisada por pares]

Washington, D. C: American Geophysical Union

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  • Título:
    Terranes of the Wonominta Block, Far Western New South Wales
  • Autor: Leitch, E. C ; Webby, B. D ; Mills, K. J ; Kolbe, P
  • Leitch, Evan C ; Scheibner, Erwin
  • Materias: Geology, Structural ; Orogeny
  • Es parte de: Terrane Accretion and Orogenic Belts, 1987, p.31-37
  • Descripción: The Wonominta block in far western New South Wales comprises Precambrian and Lower Paleozoic rocks that belong to four tectonostratigraphic terranes. The Mount Wright terrane is made up of a Lower and lower Middle Cambrian sequence of volcanics and sedimentary rocks. The Wertago terrane includes three principal units, multi‐deformed metamorphics and lower grade simply folded slate, sandstone, metabasalt and calcareous rocks of Proterozoic age, and (?) Cambrian sandstone and siltstone. The Kayrunnera terrane also consists of (?) Cambrian sandstone and siltstone, but aeromagnetic data suggest that it has a basement of different character from that of the Wertago terrane. These three terranes are separated by major long‐active faults. Each was deformed in the Middle‐Late Cambrian and the oldest linkage sequence is provided by uppermost Cambrian‐Lower Ordovician paralic and shelf craton‐derived clastic sediments. Isolated inliers of slate, redeposited sandstone and mafic volcanics further north that are possibly as young as Early Ordovician are grouped in the Tibooburra terrane. These rocks were folded and suffered low‐grade regional metamorphism prior to emplacement of a 410 Ma granite. The rocks of the Wertago and Kayrunnera terranes are probably autochthonous for they show several features linking them to the Precambrian craton exposed further west. However the Mount Wright terrane, which possibly incorporates arc volcanics, is seemingly anomalously located and is regarded as suspect. The oldest linkage sequence tying the Tibooburra terrane to adjacent terranes are Mesozoic, but regional paleogeographic considerations suggest that it had assumed its present position at least by the Devonian.
  • Editor: Washington, D. C: American Geophysical Union
  • Idioma: Inglés
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