Evolution of detached listric fault systems in the Ceduna Delta, Bight Basin: Insights from 3D seismic data

Matthew Kovacevic; Jane Cunneen; Chris Elders

doi:10.1071/ASEG2015ab012

24th International Geophysical Conference and Exhibition – Geophysics and Geology Together for Discovery

ISSN: 2202-0586
E-ISSN:

oa Evolution of detached listric fault systems in the Ceduna Delta, Bight Basin: Insights from 3D seismic data
Authors Matthew Kovacevic^a, Jane Cunneen^b and Chris Elders^c
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^a Curtin University, School of Exploration Geophysics [email protected] ^b Curtin University, School of Applied Geology [email protected] ^c Curtin University, School of Applied Geology [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2015, Issue 24th International Geophysical Conference and Exhibition – Geophysics and Geology Together for Discovery, Dec 2015, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2015ab012
- Published online: 01 Dec 2015

Abstract

Deformation of the Cretaceous Ceduna Delta system is dominated by gravitationally driven listric extensional faults. They were initiated as strongly listric faults during deposition of the Cenomanian White Pointer deltaic sequence, coincident with the final stages of rifting and break up between Australia and Antarctica. The faults were progressively reactivated during deposition of the post break up Santonian to Maastrichtian Hammerhead deltaic sequence, propagating upwards as relatively planar sequences associated with narrow zones of downward converging secondary faults.

Individual faults segments maintain a characteristic curved geometry in map view which link together to form relatively long continuous NW-SE trending faults which rotate to a NNW orientation in the west of the study area (towards the break of slope at the edge of the delta top). Previously unrecognised N-S trending faults that are confined to the lower part of the sequence control some of the segmentation of the NW-SE trending faults.

Understanding the evolution of these fault systems will help to better define the risks associated with Cretaceous plays in this highly prospective frontier petroleum province.

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References

Ball, P., Eagles, G., Ebinger, C., McClay, K. and Totterdell, J., 2013. The spatial and temporal evolution of strain during the separation of Australia and Antarctica. Geochemistry, Geophysics, Geosystems, 14 (8), 2771-2799.
Bradshaw, B.E., Rollet, N., Totterdell, J.M. & Borissova, I., 2003. A Revised Structural Framework for Frontier Basins on the Southern and Southwestern Australian Continental Margin. Record 2003/003. Geoscience Australia, Canberra.
Espurt, N., Callot, J., Totterdell, J., Struckmeyer, H. and Vially R., 2009. Interactions between continental breakup dynamics and large-scale delta system evolution: Insights from the Cretaceous Ceduna delta system, Bight Basin, Southern Australian margin. Tectonics, 28 (6).
Teasdale, J.P., Pryer, L.L., Stuart-Smith, P.G., Romine, K.K., Etheridge, M.A., Loutit, T.S. and Kyan, D.M., 2003. Structural Framework and basin Evolution of Australia’s Southern Margin. APPEA Journal, 2003, 13-37.
Totterdell, J.M. and Krassay, A.A., 2003. The role of shale deformation and growth faulting in the Late Cretaceous evolution of the Bight Basin, offshore southern Australia. In: Van Rensbergen, P, Hills, P, Maltman, A.J. and Morley, C.K. (Eds.). Subsurfce Sediment Mobilisation. Geological Society, London, Special Publications, 216, 429-442.
Totterdell, J.M. and Bradshaw, B.E., 2004. The structural framework and tectonic evolution of the Bight Basin. Eastern Australasian Basins Symposium II. Petroleum Exploration Society of Australia, Special Publication, 41-61.

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Article Type: Research Article

Keyword(s): Bight Basin; Ceduna; delta; fault

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oa Evolution of detached listric fault systems in the Ceduna Delta, Bight Basin: Insights from 3D seismic data

Abstract

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