Crustal thickness in Australia: where, how and what for?

Alexey Goncharov; Ian Deighton; Michael Tischer; Clive Collins

doi:10.1071/ASEG2007ab048

ISSN: 2202-0586
E-ISSN:

oa Crustal thickness in Australia: where, how and what for?
Authors Alexey Goncharov^a, Ian Deighton^b, Michael Tischer^c and Clive Collins^d
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^a Geoscience Australia, GPO Box 378, Canberra, ACT, 2601, , Australia, [email protected] ^b Burytech Pty Ltd, PO Box 3008, Bemboka, NSW, 2550, , Australia, [email protected] ^c ExxonMobil, 3319 Mercer st., Houston, TX, 77027, , USA, [email protected] ^d Geoscience Australia, GPO Box 378, Canberra, ACT, 2601, Australia, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2007, Issue ASEG2007 - 19th Geophysical Conference, Dec 2007, p. 1 - 4
DOI: https://doi.org/10.1071/ASEG2007ab048
- Published online: 01 Dec 2007

Abstract

Summary

Geoscience Australia regularly undertakes crustal thickness measurements and it is the only National Agency that maintains a database of such measurements in Australia and its offshore territories, including the Australian Antarctic Territory. The most reliable estimates of crustal thickness come from refraction and wide-angle reflection seismic experiments, as well as from receiver function analyses. As of September 2007, there are only 474 crustal thickness measurements stored in Geoscience Australia’s database derived from such experiments. Crustal thickness data are essential for development of crustal scale tectonic models, assessment of geohazards, constraining of potential field inversions, estimation of crustal stretching rate in sedimentary basin modelling. Estimates of relative significance of depth of subsidence, basement heat production, and thickness of the crust for positioning of hydrocarbon maturation windows show that effects of crustal thickness can outweigh those of basement heat production.

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References

Doyle, H.A., Everingham, I.B. & Hogan, T.K., 1959. Seismic recordings of large explosions in south-eastern Australia. Australian Journal of Physics, 12, 220-230.
Drummond, B.J. & Collins, C.D.N., 1986. Seismic evidence for underplating of the lower continental crust of Australia. Earth and planetary Science Letters, 79, 361-372.
Drummond, B.J., Goleby, B.R.G., Goncharov, A.G., Wyborn, L.A.I., Collins, C.D.N. and MacCready, T., 1998. Crustalscale structures in the Proterozoic Mount Isa Inlier of North Australia: their seismic response and influence on mineralisation. Tectonophysics, 288(1-4), 43-56.
Goncharov, A., Collins, C., Petkovic, P., Fomin, T., Pilipenko, V., Drummond, B., & Lee, C.S., 1998. Ocean-bottom seismograph and conventional reflection surveys in the Petrel sub-basin: an integrated seismic study. Exploration Geophysics, 29, 384-390.
Goncharov, A., Petkovic, P., Fomin, T., & Symonds, P., 1999. Crustal reflectivity and bulk seismic velocity: how close is the relationship? AGSO Research Newsletter, 31, 6-11.
Goncharov, A., Petkovic, P., Leitchenkov, G. & Tassell, H., 2005. Basement and crustal results from the Bremer Subbasin, SW Australia and its Antarctic counterpart drive Australia-Russia cooperation. Preview, 2005, 15-22.
Huston, D., Goleby, B., Vandenberg, L., Bagas, L., Jones, L., Korsch, R., Lyons, P., Johnston, W., Smith, T., Barton, T. & Johnstone, D., 2006. The Tanami Deep Seismic Reflection Experiment: a look under the surface of a major gold province in northern Australia. Abstracts of the 18th Australian Geological Convention, 18-22.
Müller, R.D., Goncharov, A. & Kritski, A., 2005. Geophysical evaluation of the enigmatic Bedout basement high, offshore northwestern Australia. Earth and Planetary Science Letters, 237, 264-284.
Van der Hilst, R.D., Kennett, B.L.N. & Shibutani, T., 1998. Upper Mantle structure beneath Australia from portable array deployments. In: “Structure & Evolution of the Australian Continent”, Editors J. Braun et al., Geodynamics Series, vol. 26, 39-57.

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Article Type: Research Article

Keyword(s): basin modelling; crustal models; geohazards; hydrocarbon maturation.; refraction seismic

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oa Crustal thickness in Australia: where, how and what for?

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