Department of Industry and Resources Geological Survey of Western Australia Tectonic evolution and mineralization of the Australian Proterozoic Ian M.

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Presentation transcript:

Department of Industry and Resources Geological Survey of Western Australia Tectonic evolution and mineralization of the Australian Proterozoic Ian M. Tyler

Department of Industry and Resources Geological Survey of Western Australia Australian Proterozoic mineralization Substantial mineral resources: –Hematite iron ore –Unconformity-related U –Granite-related Au-Cu –Proterozoic iron oxide-Cu-Au(-U) –Orogenic lode-Au –SEDEX Pb-Zn-Ag –Layered intrusion Ni –Diamond

Department of Industry and Resources Geological Survey of Western Australia

Department of Industry and Resources Geological Survey of Western Australia Proterozoic mineralization in WA Extensive “greenfields” areas in WA –Under-explored –Limited pre-competitive geoscience data i.e. “under-researched” by Government ARC-funded Academic research

Department of Industry and Resources Geological Survey of Western Australia Kimberley-Arunta Capricorn Paterson Albany-Fraser West Musgrave Pinjarra

Department of Industry and Resources Geological Survey of Western Australia Reassess the tectonic evolution of the Australian Proterozoic Establish tectonic setting of known mineralization Predict mineral potential of greenfields areas Target areas for acquisition of: –geochronological, isotopic, geochemical, and geophysical information –remapping

Department of Industry and Resources Geological Survey of Western Australia Tectonic models

Department of Industry and Resources Geological Survey of Western Australia Tectonic models Etheridge, Rutland and Wyborn, 1987 “Orogenesis and tectonic process in the early to middle Proterozoic of Northern Australia” –The “BMR model” –Intracratonic orogeny - “stabilist” –Very influential for exploration models BUT –Predated SHRIMP –Unsuccessful at predicting events and correlations

Department of Industry and Resources Geological Survey of Western Australia Tectonic models Myers, Shaw and Tyler, 1996, Tectonics “Tectonic Evolution of Proterozoic Australia” –Plate tectonic processes - “mobilist” –Episodes of continental break-up, terrane accretion and plate aggregation –Based on geochronological, isotopic, geochemical, and geophysical information remapping

Department of Industry and Resources Geological Survey of Western Australia Tectonic models Myers et al. has become widely accepted to the point –“Traditional palaeotectonic perspective”! (Dawson et al., 2002) See instead Krapez, 1999

Department of Industry and Resources Geological Survey of Western Australia Tectonic models Tyler, 2005, Encyclopedia of Geology - updates Myers et al., 1996: –North Australian Basins GA-NTGS-GSQ –NTGS-GA Tanami-Arunta work –GSWA Capricorn work –Australian Geodynamics CRC/Australian Crustal Research Centre –Tectonics SRC UWA/Curtin –Gawler Mineral Promotion GA-PIRSA –Broken Hill Exploration Initiative GA-NSWDMR-PIRSA –Macquarie Uni –etc, etc

Department of Industry and Resources Geological Survey of Western Australia Magnetics

Department of Industry and Resources Geological Survey of Western Australia Gravity

Department of Industry and Resources Geological Survey of Western Australia Modified from Betts et al., 2002 (after Myers et al., 1996)

Department of Industry and Resources Geological Survey of Western Australia Archaean basement

Department of Industry and Resources Geological Survey of Western Australia Break-up of Archaean continents

Department of Industry and Resources Geological Survey of Western Australia Assembly of West Australian Craton

Department of Industry and Resources Geological Survey of Western Australia Assembly of North Australian Craton

Department of Industry and Resources Geological Survey of Western Australia Assembly of South Australian Craton

Department of Industry and Resources Geological Survey of Western Australia Collision of West and North Australian Cratons

Department of Industry and Resources Geological Survey of Western Australia Palaeo- to Mesoproterozoic supercontinent: “Columbia”

Department of Industry and Resources Geological Survey of Western Australia Proterozoic Australia in Columbia

Department of Industry and Resources Geological Survey of Western Australia Was Australia “strung out”?

Department of Industry and Resources Geological Survey of Western Australia Docking with Laurentia

Department of Industry and Resources Geological Survey of Western Australia Intracratonic extension

Department of Industry and Resources Geological Survey of Western Australia Reorganisation: Collision with East Antarctica – Grenvillian events

Department of Industry and Resources Geological Survey of Western Australia Post-collision

Department of Industry and Resources Geological Survey of Western Australia Warakurna large igneous province Mantle plume

Department of Industry and Resources Geological Survey of Western Australia Docking of Greater India

Department of Industry and Resources Geological Survey of Western Australia East Gondwana 900 Ma –Fitzsimons, 2003

Department of Industry and Resources Geological Survey of Western Australia Proterozoic Australia in the Rodinia supercontinent

Department of Industry and Resources Geological Survey of Western Australia Break-up of Rodinia - Centralian Superbasin and Adelaide Rift Complex

Department of Industry and Resources Geological Survey of Western Australia Peak Hill: Au Mount Olympus: Au

Department of Industry and Resources Geological Survey of Western Australia Mineral potential in WA Collisional and accretionary settings –Capricorn, Halls Creek and King Leopold, Albany- Fraser, Pinjarra, Paterson Orogens Orogenic lode-Au VHMS Porphyry Cu-Au Layered mafic-ultramafic intrusions

Department of Industry and Resources Geological Survey of Western Australia Kimberley-Arunta Capricorn Paterson Albany-Fraser West Musgrave Pinjarra

Department of Industry and Resources Geological Survey of Western Australia Mineral potential in WA Intracratonic settings –Pooranoo Metamorphics – Mangaroon Orogeny SEDEX Pb-Zn-Ag –Granite intrusions in Arunta, Musgrave, Albany- Fraser, Capricorn, Paterson: e.g. Hiltaba Suite or Mount Crofton Granite Iron oxide-Cu-Au Granite-related Au-Cu –Layered mafic-ultramafic intrusions Older intrusions: Hart Dolerite, Musgrave, Albany-Fraser

Department of Industry and Resources Geological Survey of Western Australia Kimberley-Arunta Capricorn Paterson Albany-Fraser West Musgrave Pinjarra

Department of Industry and Resources Geological Survey of Western Australia Synthesis of the Australian Proterozoic Proposed Geoscience Australia project in collaboration with Tectonics Special Research Centre and State geological surveys

Department of Industry and Resources Geological Survey of Western Australia