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Stratotectonic Terranes of the Eastern Australian Tasmanides

Leitch, E. C ; Scheibner, E Leitch, Evan C ; Scheibner, Erwin

Terrane Accretion and Orogenic Belts, 1987, p.1-19 [Revista revisada por pares]

Washington, D. C: American Geophysical Union

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  • Título:
    Stratotectonic Terranes of the Eastern Australian Tasmanides
  • Autor: Leitch, E. C ; Scheibner, E
  • Leitch, Evan C ; Scheibner, Erwin
  • Materias: Geology, Structural ; Orogeny
  • Es parte de: Terrane Accretion and Orogenic Belts, 1987, p.1-19
  • Descripción: Rigorous analysis of regional relationships within the Paleozoic Tasmanides of eastern Australia reveals many structural discontinuities across which the older rocks of the orogenic belt cannot be unequivocally linked. These discontinuities, most of which are faults or assumed faults buried beneath younger cover, form the boundaries to some thirty‐six tectonostratigraphic terranes. The development of the Tasmanides involved the amalgamation of these terranes into larger units and their accretion at the eastern cratonic edge of Gondwanaland. Major episodes of amalgamation/accretion are assumed to have coincided with widespread deformational episodes, although deformation also accompanied the dispersal of the terranes and the formation of rift and pull‐apart basins in which the earliest overlap sequences accumulated. Although many of the terranes in the western and central parts of the Tasmanides show evidence suggestive of their development close to a cratonic mass the common assumption that these were the adjacent parts of the Precambrian craton along the western edge of the orogenic belt has yet to be demonstrated. It is possible that present relationships are the result of large scale strike‐slip or thrust movements and the terranes must be treated as suspect. There is no data requiring the presence of large exotic terranes, although there is evidence that some elements of terranes interpreted as accretionary subduction complexes may be far travelled, and terrane amalgamation to form the New England Fold Belt might have occurred distant from the cratonic margin. Despite long lived subduction along the east Gondwanaland margin in the Paleozoic and the Mesozoic there is no evidence in the Tasmanides, nor in the New Zealand Rangitata Orogen, for major continental collision.
  • Editor: Washington, D. C: American Geophysical Union
  • Idioma: Inglés
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