Structural controls on the Cowarra gold deposit near Bredbo, southeastern New South Wales

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Authors:Rickard, M. J.; McQueen, K. G.; Hayden, P.
Author Affiliations:Primary:
Australian National University, Department of Geology, Canberra, Australia
Other:
University of Canberra, Australia
Volume Title:Australian Journal of Earth Sciences
Source:Australian Journal of Earth Sciences, 43(2), p.201-215. Publisher: Blackwell, Melbourne, Victoria, Australia. ISSN: 0812-0099
Publication Date:1996
Note:In English. 52 refs.; illus., incl. sects., sketch map
Summary:The Cowarra Au deposit is an epigenetic, structurally controlled, gold-bearing sulphide vein system in a regional shear zone developed within isoclinally folded Ordovician turbidites. Gold occurs mainly in sulphide-rich veins [vertical bar][vertical bar] the axial cleavage or shears on fold limbs. The mineralized shears lie in a zone of strong fold-plunge variation, in the chlorite zone of a regional metamorphic complex, and to the W of the Bega batholith. However, Au is not related to metamorphic out-flushing, but more probably to sulphide-rich fluids derived from depth during intrusion of I-type granites of the Michelago igneous complex. Local control of sulphide zoning was by decompressional dilation of axial planar structures shortly after folding and shearing. There are no saddle reefs or fault-controlled Au veins as are common elsewhere in shear-zone deposits. [R.A.H.]
Subjects:Epigene processes; Faults; Gold ores; Metal ores; Mineral deposits, genesis; Mineralization; Ordovician; Ore-forming fluids; Paleozoic; Quartz veins; Shear zones; Structural controls; Sulfides; Turbidite; Veins; Australasia; Australia; New South Wales Australia; Cowarra Deposit; Igneous processes
Coordinates:S361500 S360000 E1493000 E1490000
Abstract Numbers:96M/4043
Record ID:1996051677
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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