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| Titel: |
Complex regional fault history of the Badger Head region, northern Tasmania |
| Auteur: |
Elliott, C. G. Woodward, N. B. Gray, D. R. |
| Verschenen in: |
Australian journal of earth sciences |
| Paginering: | Jaargang 40 (1993) nr. 2 pagina's 155-168 |
| Jaar: |
1993-04 |
| Inhoud: |
Superimposed contraction, extension and oblique-slip faulting has juxtaposed and segmented blocks and slices of Precambrian metasedimentary rocks, Cambrian marine sedimentary and ultramafic rocks, and Early-Middle Palaeozoic strata near the boundary between the East and West Tasmania Terranes in the Badger Head region of northern Tasmania. Of greatest significance was post-Early Devonian southwest-directed thrusting which caused thin-skinned style imbrication and led to juxtaposition of the East and West Tasmania Terranes. Polydeformed Precambrian meta-turbiditic rocks of the Badger Head massif are part of a fault-bounded allochthonous slice which was brought to the present structural level at this time. An inferred west-directed Cambrian thrusting event emplaced ultramafic rocks (Andersons Creek ultramafic complex) and produced a tectonic melange (Port Sorell Formation), possibly within an east-dipping accretionary wedge. The Cambrian event is considered to have involved an imbricated accretionary complex containing dismembered ophiolitic slices. Superimposed Middle Devonian and post-Jurassic faulting has masked evidence of this event. Post-Jurassic deformation caused displacement of the Late Carboniferous to Jurassic cover sequence along northwest-trending strike-slip and oblique-slip faults and along the normal faults that produced northwest-trending rift basins in northern Tasmania. The normal faults are probably related to the extensional event which separated Tasmania from the mainland. The strike-slip and oblique-slip faults may be related to the Tertiary contractional deformation that affected southern Victoria. |
| Uitgever: |
Taylor & Francis |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
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