Authors / CoAuthors
Goleby, B.R. | Blewett, R.S. | Champion, D.C. | Jones, L.E.A. | Groenewald, P.B. | Cassidy, K.F. | Korsch, R.J. | Bell, B. | Whitaker, A.J.
Abstract
Deep-seismic reflection data have provided information on the crustal architecture of several highly mineralised regions within the Archaean northeastern Yilgarn Craton, Western Australia. These seismic data are characterised by several prominent features and include 1) a change in the thickness of the crust across the northeastern Yilgarn Craton, 2) subdivision of the crust into three broad layers, 3) a prominent east dip to the majority of the reflections, and 4) the identification of three east-dipping crustal-penetrating shear zones. These east-dipping shear zones divide the region into four terranes and are surprisingly similar in geometry. In the hangingwalls of the shears, there is evidence of a marked increase in deformation adjacent to the shear zone. This region is underlain by another low-angle shear zone at depth. Major orogenic Au deposits in the northeastern Yilgarn are spatially associated with major structures. The Laverton Tectonic Zone, for example, is a highly mineralised corridor that contains several world-class Au deposits plus many other smaller deposits. Other non crustal-penetrating structures within the area do not appear to be as well endowed as the Laverton structure. We infer that the complex deformed region within the hangingwall and underlain by a low-angle shear zone forms a wedge-shaped trap with upward and/or sub-horizontal moving fluids being focused into the apex of the wedge.
Product Type
nonGeographicDataset
eCat Id
41516
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
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- External PublicationAbstract
- ( Theme )
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- seismics
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- AU-WA
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_External
Publication Date
2002-01-01T00:00:00
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geoscientificInformation
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[-29.5, -27.5, 121.0, 125.5]
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