Basement Features Under Four Intra-Continental Basins in Central and Eastern Australia
- Raymond A. Price
Published Online: 18 MAR 2013
Copyright 1989 by the American Geophysical Union
Origin and Evolution of Sedimentary Basins and Their Energy and Mineral Resources
How to Cite
Finlayson, D. M., Wright, C., Leven, J. H., Collins, C. D. N., Wake-Oyster, K. D. and Johnstone, D. W. (1989) Basement Features Under Four Intra-Continental Basins in Central and Eastern Australia, in Origin and Evolution of Sedimentary Basins and Their Energy and Mineral Resources (ed R. A. Price), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM048p0043
- Published Online: 18 MAR 2013
- Published Print: 1 JAN 1989
Print ISBN: 9780875904528
Online ISBN: 9781118666654
- Sedimentary basins—Congresses;
- Mines and mineral resources—Congresses;
- Power resources—Congresses
Differences identified in deep seismic data from within basement under four basins in central and eastern Australia illustrate the diversity of structures and processes that have to be reconciled in any modelling of basin development. No single unifying process is identified from the deep seismic data. The four basins are the Ngalia and Amadeus Basins in Precambrian central Australia and the Adavale Basin and Taroom Trough from Phanerozoic eastern Australia.
All four basins are now structurally asymmetric with the thickest sequences being adjacent to a steeply faulted margin. This asymmetry, however, is a product of events late in each basin's history. Older events have led to quite different characteristics of the present-day crust under the four basins.
In particular, we emphasize that 1) the pre-depositional history of the various regions and in particular the earlier major crustal faulting plays an important part in determining the structure of the basins; 2) much of the post-depositional thrust faulting is confined to the upper crust; 3) some high-angle faulting is interpreted as penetrating the entire crust; 4) under the Adavale Basin in eastern Australia, data from the lower crust and mantle suggest that, in places, underplating/intrusion has played an important role in basin history; 5) in Phanerozoic eastern Australia the Moho is clearly identified, but any topography on it associated with basin development has largely relaxed to give a Moho with little relief; 6) the Moho is not apparent at all in the seismic fabric of the older,thicker crust of the Precambrian central Australian Arunta Block and the adjacent Amadeus Basin.