Fault Geometry and Deformation History, Northern Carnarvon Basin

Chris Elders; Sam McHarg; Amy I’Anson

doi:10.1071/ASEG2016ab282

25th International Conference and Exhibition – Interpreting the Past, Discovering the Future

ISSN: 2202-0586
E-ISSN:

oa Fault Geometry and Deformation History, Northern Carnarvon Basin
Authors Chris Elders^a, Sam McHarg^b and Amy I’Anson^c
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^a Department of Applied GeologyCurtin University, [email protected] ^b Department of Applied GeologyCurtin University, [email protected] ^c School of GeosciencesUniversity of Sydney, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2016, Issue 25th International Conference and Exhibition – Interpreting the Past, Discovering the Future, Dec 2016, p. 1 - 3
DOI: https://doi.org/10.1071/ASEG2016ab282
- Published online: 01 Dec 2016

Abstract

The Carnarvon Basin has experienced three distinct phases of extension - in the Carboniferous-Permian, in the Upper Triassic to Middle Jurassic and in the Lower Cretaceous. Detailed mapping of fault patterns associated with each event is possible at a regional scale using widespread, publically available 3D seismic data sets.

The complex interaction between NNE and NE-SW oriented Carboniferous and Permian age faults provides the structural framework for subsequent rift events. Both sets of faults show evidence of oblique reactivation under a WNW oriented extensional regime in the Jurassic, somewhat at odds with the general perception of NW oriented extension associated with separation of Argoland from the NW shelf at this time.

Lower Cretaceous extension is much shorter lived, is primarily confined to the SW part of the Northern Carnarvon Basin and is associated with significant uplift and erosion. The relationship of this event to the separation of Greater India from Australia is less clear, but a proposed mantle plume goes some way to addressing some of the observed structural and stratigraphic relationships.

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References

Etheridge, M.A., O’Brien, G.W., 1994. Structural and tectonic evolution of the Western Australian margin basin system. PESA J. 22.
Hall, R., 2012. Late Jurassic Cenozoic reconstructions of the Indonesian region and the Indian Ocean. Tectonophysics 570-571, 141.
Hill, G., 1994. The role of pre-rift structure in the architecture of the Dampier Basin area, North West Shelf, Australia. APEA J. 34, 602-613.
Lasky, R.P., Mory, A.J., Blundell, K.A., Ghori, K.A.R., 2002. Prospectivity of the Peedamullah Shelf and Onslow Terrace revisited. West Aust. Basins Symp.
Longley, I.M., Buessenschuett, L., Clydsdale, L., Cubitt, C.J., Davis, R.C., Johnson, M.K., Marshall, N.M., Murray, A.P., Somerville, R., Spry, T.B., Thompson, N.B., 2002. The North West Shelf of Australia - a Woodside perspective. West Aust. Basins Symp.
Mory, A.J., Iasky, R.P., Ghori, K.A.R., 2003. A summary of the geological evolution and petroleum potential of the Southern Carnarvon Basin Western Australia. Western Australia Geological Survey, Perth.
Rohrman, M. 2015. Delineating the Exmouth mantle plume (NW Australia) from denudation and magmatic addition estimates. Lithosphere, 7, 589-600.

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Article Type: Research Article

Keyword(s): extensional faulting; fault reactivation; Northern Carnarvon Basin

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