Crustal architecture of Central Victoria: results from the 2006 deep crustal reflection seismic survey  


Authors / CoAuthors

Korsch, R.J. | Moore, D.H. | Cayley, R.A. | Costelloe, R.D. | Nakamura, A. | Willman, C.E. | O'Shea, P.J. | Morand, V.J.

Abstract

The ~400 km long Central Victorian deep crustal reflection seismic survey was carried out in 2006 as a collaborative project between the pmd*CRC, Geoscience Australia, the Victorian Government, Ballarat Goldfields NL, Gold Fields Australasia Pty Ltd and Perseverance Corporation Limited using the facilities of ANSIR. The aim was to cross several basement zones 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. The Moyston Fault, which forms the boundary between the Delamerian Orogen to the west and the Stawell Zone to the east, is an east-dipping planar fault that 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 22 km, forming a Y-shaped geometry. Faults that are internal to the Stawell and Bendigo zones are almost entirely west-dipping listric faults, that cutp 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 several 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, is a very low-angle north-dipping fault. 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 consists of a series of very strong subhorizontal reflections about 5-6 km thick starting at about 18 km depth, with a less reflective zone below it.

Product Type

nonGeographicDataset

eCat Id

65542

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MNHD  

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Commonwealth of Australia (Geoscience Australia)  
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia

Keywords

  • External Publication
( Theme )
  • geology
( Theme )
  • seismic sections
( Theme )
  • structural geology
  • AU-VIC
Australian and New Zealand Standard Research Classification (ANZSRC)
  • Earth Sciences
  • Published_Internal

Publication Date

2008-01-01T00:00:00

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Australian Government Security ClassificationSystem    

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Creative Commons Attribution 4.0 International Licence    

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geoscientificInformation

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