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Inverted transtensional basin setting for gold and copper and base metal deposits at Cobar, New South Wales

The Cobar Basin in western New South Wales formed by sinistral transtension in the latest Silurian to late Early Devonian and evolved through a syn-rift phase of brittle upper crustal faulting and subsidence followed by a post-rift sag phase of passive subsidence which can also be recognised in other Early Devonian stratotectonic elements in western New South Wales. Basin evolution was controlled by regional faults splaying off the Gilmore Suture and the Kiewa Fault. The Cobar Basin was largely inverted - 400 Ma ago with reversal of movement (dextral transpression) on synsedimentary north-northwest-trending strike-slip/oblique-slip faults and on west-northwest-trending dip-slip faults. These faults controlled the partitioning of deformation in surface rocks into a high-strain Zone I developed above a half positive flower structure in the eastern part of the basin, and a lower strain Zone 2 developed above a flat detachment in the central part of the basin. Shortcut faults developed during inversion are the most likely structural targets for sulphide and gold accumulation which is structurally controlled and syntectonic metahydrothermal in origin. Some of these faults have experienced strike-slip faulting as well as contractional movement.

Data and Resources

InformaciĆ³n Adicional

Field Value
Title Inverted transtensional basin setting for gold and copper and base metal deposits at Cobar, New South Wales
Type Dataset
Language English
Licence Creative Commons Attribution 4.0 International
Data Status inactive
Update Frequency unknown
Landing Page http://data.gov.au/dataset/589d66db-d0e8-4c61-b011-388b6607cc7f
Date Published 2016-09-04
Date Updated 2017-01-09
Contact Point
Geoscience Australia
clientservices@ga.gov.au
Jurisdiction Commonwealth of Australia
Data Portal FIND (http://find.ga.gov.au) CSW Harvester
Publisher/Agency Geoscience Australia
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