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| Titel: |
Repeated Palaeozoic thrusting and allochthoneity of Precambrian basement, northern Tasmania |
| Auteur: |
Woodward, N. B. Gray, D. R. Elliott, C. G. |
| Verschenen in: |
Australian journal of earth sciences |
| Paginering: | Jaargang 40 (1993) nr. 3 pagina's 297-311 |
| Jaar: |
1993-06 |
| Inhoud: |
Stratigraphic and structural relationships in northern Tasmania suggest a deformation sequence involving west-directed Cambrian and Devonian thrusting with imbrication of Precambrian basement, the Cambrian oceanic suite and the Ordovician continental margin overlap sequences. Section balancing requires a depth to detachment of 5-10 km and a total shortening on the order of 80 km, with at least half of this displacement attributable to the Late Cambrian deformation. Major faults are the Lorinna, Round Mountain, Mole Creek and Golden Valley Thrusts. The smaller Precambrian massifs of northern Tasmania (Forth and Badger Head Massifs) represent the basal parts of major west-vergent thrust sheets which were emplaced in the Late Cambrian. Emplacement of these Cambrian thrust sheets warped the foreland upward causing exposure of the Tyennan and Rocky Cape Massifs. East-west folding followed by southwest vergent thrusting dominated Devonian deformation in northern Tasmania. The Devonian event redeformed the earlier Cambrian thrust structures, emplaced the Badger Head, Golden Valley, Mersey River and Forth Basement Massifs (basement slices) and carried the East Tasmania Terrane on to the underlying West Tasmania Terrane basement in a piggyback fashion above the Devonian thrust sheets. Later east-southeast vergent Devonian thrusting within the Dial Range requires that the Rocky Cape Basement massif is also somewhat allochthonous, perhaps in the manner of the foreland basement uplifts of the Rocky Mountains of the United States. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 6 van 8 gevonden artikelen
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