Authors / CoAuthors
Willman, C.E. | Korsch, R.J. | Moore, D.H. | Cayley, R.A. | Lisitsin, T.J.
Abstract
Deep seismic reflection data across the Western Lachlan Orogen of southeast Australia have provided important insights into crustal-scale fluid pathways and possible source rocks across one of the world's richest orogenic gold provinces. The profiles span three of Victoria's most productive structural zones: the Stawell, Bendigo and Melbourne zones. Zone-scale variations in the age and style of gold deposits are reflected by changes in crustal structure and composition as revealed by the seismic data. The Stawell and Bendigo structural zones can be broadly divided into a lower region of interlayered meta-volcanic and meta-sedimentary rocks and an upper region of meta-sedimentary rocks. First-order faults appear to have accommodated large scale crustal thickening down to the lower crust. The bilateral distribution of gold production in the Stawell and Bendigo zones is related to the V-shaped crustal-scale geometry of the two zones in cross-section. Major first-order faults, like the east dipping Moyston Fault and a set of west dipping listric faults, were major fluid conduits during the most important gold event at 440 Ma. These first-order faults converge in the mid and lower crust in a region beneath the western Bendigo Zone where mafic volcanic rocks are identified as a likely common source of metamorphic fluids and gold during the main 440 Ma mineralizing event.
Product Type
nonGeographicDataset
eCat Id
68279
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Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
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Keywords
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- External Publication
- ( Theme )
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- metallogenesis
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- mineral deposits
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- seismics
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- structural geology
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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
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2008-11-10T00:00:00
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