Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/57932
Citations
Scopus Web of Science® Altmetric
?
?
Type: Journal article
Title: Basin geometry and salt diapirs in the Flinders Ranges, South Australia: Insights gained from geologically-constrained modelling of potential field data
Author: Backe, G.
Baines, G.
Giles, D.
Preiss, W.
Alesci, A.
Citation: Marine and Petroleum Geology, 2010; 27(3):650-665
Publisher: Elsevier Sci Ltd
Issue Date: 2010
ISSN: 0264-8172
1873-4073
Statement of
Responsibility: 
Guillaume Backé, Graham Baines, David Giles, Wolfgang Preiss and Andrew Alesci
Abstract: The Adelaide Basin in Australia is a complex of late Neoproterozoic to Early Cambrian rift and sag basins which was inverted during the Cambro-Ordovician Delamerian Orogeny. The deposition of evaporitic sediments during the earliest stage of basin development in the late Neoproterozoic (Willouran age) played a major role in the subsequent tectonic evolution of the basin. Previous studies have shown that early mobilization, vertical transport and withdrawal of the evaporites influenced the sedimentation during the late Neoproterozoic and Early Cambrian. The evaporites also influenced deformation during the inversion of the basin and the development of the Delamerian fold and thrust belt. However, the control exerted by basement structures in the deposition of the evaporitic beds and the role of these tectonic structures in the later inversion of the basin have been poorly constrained. In this work, we use a combination of published and original geological observations along with the interpretation of potential field datasets (total magnetic intensity and Bouguer anomaly data) to better constrain the geology of the basin at depth. We construct two and a half dimensional forward models of the potential field data along selected profiles across the Adelaide Basin. These models are constrained by the geology at the surface, drill hole data and measured petrophysical properties (specific gravity and magnetic susceptibility). We achieved the best fit between observed and modelled potential fields with a model favouring thick-skinned deformation, where the diapirs are not randomly distributed, but located directly above basement-penetrating normal faults. Furthermore, these normal faults were probably active during the sedimentation of the late Neoproterozoic and Early Cambrian sediments, and underwent partial or total inversion during the Cambro-Ordovician Delamerian Orogeny. Mobilisation and withdrawal of the evaporites was therefore initiated and facilitated by the extension coeval with the opening of the basin, and continued during the subsequent Delamerian Orogeny. © 2009 Elsevier Ltd. All rights reserved.
Keywords: Salt tectonics
Extension
Compression
South Australia
Potential field
Forward modelling
Inversion
Rights: Copyright © 2009 Elsevier Ltd All rights reserved.
DOI: 10.1016/j.marpetgeo.2009.09.001
Appears in Collections:Aurora harvest
Earth and Environmental Sciences publications

Files in This Item:
There are no files associated with this item.


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.