Authors / CoAuthors
Korsch, R.J.
Abstract
The ~400 km long Central Victorian deep crustal reflection seismic survey was conducted in 2006 as a collaborative project between the pmd*CRC, Geoscience Australia, the Victorian Government, Northgate Minerals Corporation, Gold Fields Australasia Pty Ltd and Lihir Gold Ltd, using the facilities of ANSIR. The aim of the survey was to cross several basement zones (Figure 1) and provide information on the crustal architecture, particularly across the highly prospective Palaeozoic rocks occurring along strike to the north of the major Victorian goldfields. In the seismic section (Figure 2), the Moyston Fault is interpreted as a major east-dipping fault forming the eastern boundary of the Grampians-Stavely Zone. It cuts through the entire crust to the Moho. The boundary between the Stawell Zone and the Bendigo Zone farther to the east is the Avoca Fault, which appears to be a west-dipping listric fault that links to the Moyston Fault at a depth of about 7 sec TWT (~22 km), forming a Y-shaped geometry. Internal faults in the Stawell and Bendigo zones are almost entirely west-dipping listric faults, which cut the highly reflective lower crust of these zones. The boundary between the Bendigo and Melbourne zones, the Heathcote Fault Zone, forms a zone of strong west-dipping reflections about three kilometres wide to a depth of at least 20 km, and possibly to the Moho. The Governor Fault, separating the Melbourne Zone from the Tabberabbera Zone, dips to the north at about 10° where the survey crosses it. The seismic character of the lower crust below the Melbourne Zone (the 'Selwyn Block') is significantly different to that observed below the Bendigo and Stawell zones, and contains several very strong subhorizontal reflections about 5-6 km thick starting at about 18 km depth, with a less reflective zone both above and below the reflective zone. The new seismic data will help validate regional cross-sections being constructed concurrently for 3D interpretation and the building of a meaningful 3D geological map of Central Victoria. The seismic data and the 3D map will significantly enhance our understanding of the geological evolution of Victoria, and the regional-scale controls on gold mineralisation.
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nonGeographicDataset
eCat Id
65862
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
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Keywords
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- External Publication
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- 3D model
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- structural geology
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- geodynamics
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- AU-VIC
- Australian and New Zealand Standard Research Classification (ANZSRC)
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- Earth Sciences
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- Published_Internal
Publication Date
2008-05-15T00:00:00
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