palaeogeography
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Apatite fission track and vitrinite reflectance data suggest considerable mid to Late Cretaceous deposition in the Murray Basin area, and substantial erosion of this sediment prior to sedimentation in the Murray Basin commencing in the Late Palaeocene/Early Eocene.
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The Tasman Frontier region includes c. 3,000,000 sq km of seabed that is thought to be underlain by crust with continental affinities: the Lord Howe Rise, Bellona Trough, Challenger Plateau, Dampier Ridge, Middleton Basin, Fairway Basin, New Caledonia Trough, Norfolk Ridge System, Reinga Basin, and deep-water parts of Taranaki and Northland basins. We have compiled and interpreted c. 100,000 line km of archival seismic reflection data. Using seismic stratigraphy tied to Deep Sea Drilling Project (DSDP) wells, we identify a tectonic and stratigraphic event that we refer to as the 'Tectonic Event of the Cenozoic Tasman Area' (TECTA). This Middle Eocene to Late Oligocene event involved regional uplift followed by 1-2 km of tectonic subsidence of topographic highs, and >2 km of tectonic subsidence in the New Caledonia Trough. Strata below the TECTA reflector (or seismic unit in some places) are locally folded or reverse faulted. We present seismic-stratigraphic evidence that numerous islands were transiently created by uplift on the Lord Howe Rise during the TECTA event. We suggest that the underlying cause of the TECTA event was initiation of the subduction system that has since evolved into the Tonga-Kermadec system. Note: Abstract for initial submission; acceptance to be confirmed.
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Australia - Evolution of a Continent: Palaeogeographic Atlas
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Previously undated post Devonian sediments are shown by plant macro- and microfossils to be Early Cretaceous, and thus part of the Eromanga Basin. Modern landscape in the northern Barrier Ranges results from differential erosion following post-Early Cretaceous deformation that folded these and underlying rocks, most probably in response to reverse movements on faults at the western margin of the Bancannia Trough.
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No product available. Removed from website 25/01/2019
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No product available. Removed from website 25/01/2019
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Legacy product - no abstract available
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No product available. Removed from website 25/01/2019
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No product available. Removed from website 25/01/2019
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Presentation delivered on 9 March 2012 by Marita Bradshaw.