Structure and development of the west Tasmanian offshore sedimentary basins: Results of recent marine and aeromagnetic surveys
| Autor: | Neville F. Exon, A. J. Meixner, A. M. G. Moore, PJ Hill |
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| Rok vydání: | 1997 |
| Předmět: | |
| Zdroj: | Australian Journal of Earth Sciences. 44:579-596 |
| ISSN: | 1440-0952 0812-0099 |
| DOI: | 10.1080/08120099708728338 |
| Popis: | The Sorell and southernmost Otway Basins, off west Tasmania, cover an area of 100 000 km2. At least 6 km of Cretaceous‐Tertiary section is present in places and more than 50% of the region has a sediment thickness greater than 2 km. Free oil traces were found in Cape Sorell 1, drilled in the Strahan Sub‐basin and geochemical surveys of sea‐floor sediments indicate thermogenic hydrocarbons and mature source rocks at depth. New data on the basin have come from swath‐mapping, deep seismic and aeromagnetic surveys recently conducted by AGSO. The Sorell Basin initiated in the latest Jurassic ‐ earliest Cretaceous, largely by wrench tectonics within the Southern Rift System between the Australian and Antarctic cratons. Post‐Cenomanian shallow marine to fluvial deposition was disrupted by major Maastrichtian ‐ Early Paleocene tectonism associated with Australia‐Antarctica breakup off west Tasmania. This was the last major structuring event in the Sorell Basin, producing a basement high adjacent to the transtensi... |
| Databáze: | OpenAIRE |
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