Authors / CoAuthors
Korsch, R.J. | Fraser, G.L. | Dutch, R. | Neumann, N.L. | Blewett, R.S. | Bendall, B. | Reid, A.J. | Cowley, W. | Nakamura, A. | Fomin, T. | Milligan, P.R.
Abstract
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 the Gawler Craton for uranium and geothermal energy, by establishing the regional geodynamic framework and improving our understanding of the crustal architecture. The seismic line crossed the western boundary of a region of elevated surface heat flow, termed the South Australian Heat Flow Anomaly (SAHFA). This broad zone correlates with elevated surface heat production values, predominantly associated with high heat producing granites, and thus the boundary is an isotopic and geochemical boundary. The seismic line crosses several tectonic domain boundaries in the Gawler Craton, including between the Archaean core of the craton and younger domains to the east and west. It also crossed the Kalinjala Shear Zone, which is a key structure in the southern and central Gawler Craton, defining a boundary between Hutchison Group sedimentary rocks and Donington Suite granites in the south. In the vicinity of the seismic section, this shear zone dips moderately to the east and appears to be a major crustal-scale fault which cuts through to the Moho; it separates mid to lower crust of differing seismic reflectivity, with strong reflectivity west of the fault, and a lower reflectivity to the east. The upper crust appears to be dominated by a series of thin-skinned thrust faults, most of which dip to the east. The seismic line also crossed 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 tested the difference in crustal architecture between the two mineral provinces.
Product Type
nonGeographicDataset
eCat Id
70178
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
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Keywords
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- External PublicationAbstract
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- deformation
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- geodynamics
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- seismic sections
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- structural geology
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- AU-SA
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_Internal
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2010-01-01T00:00:00
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