Geological interpretation of the 2008 seismic reflection, refraction and magnetotelluric data from the northern Eyre Peninsula, Gawler Craton

R.J. Korsch; G.L. Fraser; R. Dutch; N.L. Neumann; R.S. Blewett; B.R. Bendall; A.J. Reid; W.M. Cowley; A. Nakamura; T. Fomin; P.R. Milligan; S. Thiel

doi:10.1081/22020586.2010.12042013

ISSN: 2202-0586
E-ISSN:

oa Geological interpretation of the 2008 seismic reflection, refraction and magnetotelluric data from the northern Eyre Peninsula, Gawler Craton
Authors R.J. Korsch^a, G.L. Fraser^b, R. Dutch^c, N.L. Neumann^d, R.S. Blewett^e, B.R. Bendall^f, A.J. Reid^g, W.M. Cowley^h, A. Nakamuraⁱ, T. Fomin^j, P.R. Milligan^k and S. Thiel^l
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^a Geoscience Australia, GPO Box 378 Canberra ACT 2601, [email protected] ^b Geoscience Australia, GPO Box 378 Canberra ACT 2601, [email protected] ^c PIRSA, GPO Box 1671 Adelaide SA 5001, [email protected] ^d Geoscience Australia, GPO Box 378 Canberra ACT 2601, [email protected] ^e Geoscience Australia, GPO Box 378 Canberra ACT 2601, [email protected] ^f PIRSA, GPO Box 1671 Adelaide SA 5001, [email protected] ^g PIRSA, GPO Box 1671 Adelaide SA 5001, [email protected] ^h PIRSA, GPO Box 1671 Adelaide SA 5001, [email protected] ⁱ Geoscience Australia, GPO Box 378 Canberra ACT 2601, [email protected] ^j Geoscience Australia, GPO Box 378 Canberra ACT 2601, [email protected] ^k Geoscience Australia, GPO Box 378 Canberra ACT 2601, [email protected] ^l Earth & Environmental Sciences University of Adelaide, Adelaide, , SA 5005, [email protected]
Publisher: Australian Society of Exploration Geophysicists
Source: ASEG Extended Abstracts, Volume 2010, Issue ASEG2010 - 21st Geophysical Conference, Dec 2010, p. 1 - 4
DOI: https://doi.org/10.1081/22020586.2010.12042013
- Published online: 01 Dec 2010

Abstract

Summary

A deep seismic reflection profile and coincident refraction and magnetotelluric data were acquired across the northern Eyre Peninsula, Gawler Craton in 2008 to enhance the prospectivity of this region for uranium and geothermal energy, by establishing the crustal architecture and regional geodynamic framework. The seismic line crossed several tectonic domain boundaries, including the Kalinjala Mylonite Zone, which is a key structure in the southern and central Gawler Craton. In the vicinity of the seismic section, this mylonite zone dips moderately to the east and appears to be a major crustal-scale fault which cuts through to the Moho; it separates middle to lower crust of differing seismic reflectivity. The changes in seismic character correspond with the boundary between the Olympic Fe-oxide Cu-Au-U Province (host of Olympic Dam and Prominent Hill deposits) in the east, and the Central Gawler Au Province in the west, and also are suggested to limit the extent of the South Australian Heat Flow Anomaly.

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References

Chopping, R., Williams, N.C., Meixner, A.J. and Roy, I.G., 2010. 3D potential-field inversions and alteration mapping in the Gawler Craton and Curnamona Province, South Australia. Geoscience Australia, Record, 2010/10, 96-104.
Ferris, G.M., Schwarz, M.P. and Heithersay, P., 2002. The Geological Framework, Distribution and Controls of Fe-oxide Cu-Au Mineralisation in the Gawler Craton, South Australia. Part I – Geological and Tectonic Framework. In: Porter, T. M., editor, Hydrothermal Iron Oxide Copper-Gold and Related Deposits: A Global Perspective, Volume 2. PGC Publishing, Adelaide, 9–31.
Fomin, T., Nakamura, A., Maher, J., Duan, J. and Milligan, P., 2010. Acquisition and processing of seismic reflection, refraction and magnetotelluric data: advantages and limitations of these techniques, northern Eyre Peninsula, Gawler Craton. 21st International Geophysical Conference and Exhibition, Sydney, 22-26 August 2010, this volume.
Fraser, G.L., Blewett, R.S., Reid, A.J., Korsch, R.J., Dutch, R., Neumann, N.L., Meixner, A.J., Skirrow, R.G., Cowley, W.M, Szpunar, M., Preiss, W.V., Nakamura, A., Fomin, T., Holzschuh, J., Milligan, P.R. and Bendall, B.R., 2010a. Geological interpretation of deep seismic reflection and magnetotelluric line 08GA-G1: Eyre Peninsula, Gawler Craton, South Australia. Geoscience Australia, Record, 2010/10, 81-95.
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/content/journals/10.1081/22020586.2010.12042013

Article Type: Research Article

Keyword(s): Gawler Craton; magnetotellurics; reflection seismic; refraction seismic

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