Tectonic evolution and mineralization of the Australian Proterozoic

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Tectonic evolution and mineralization of the Australian Proterozoic . Ian M. Tyler. 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 - PowerPoint PPT Presentation

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Department ofIndustry and Resources

Geological Survey ofWestern Australia

Tectonic evolution and mineralization of the

Australian Proterozoic Ian M. Tyler

Department ofIndustry and Resources

Geological Survey ofWestern 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 ofIndustry and Resources

Geological Survey ofWestern Australia

Department ofIndustry and Resources

Geological Survey ofWestern 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 ofIndustry and Resources

Geological Survey ofWestern Australia

Kimberley-Arunta

Capricorn

Paterson

Albany-Fraser

West Musgrave

Pinjarra

Department ofIndustry and Resources

Geological Survey ofWestern 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 ofIndustry and Resources

Geological Survey ofWestern Australia

Tectonic models

Department ofIndustry and Resources

Geological Survey ofWestern 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 ofIndustry and Resources

Geological Survey ofWestern 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 ofIndustry and Resources

Geological Survey ofWestern 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 ofIndustry and Resources

Geological Survey ofWestern 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 ofIndustry and Resources

Geological Survey ofWestern Australia

Magnetics

Department ofIndustry and Resources

Geological Survey ofWestern Australia

Gravity

Department ofIndustry and Resources

Geological Survey ofWestern Australia

Modified from Betts et al., 2002 (after Myers et al., 1996)

Department ofIndustry and Resources

Geological Survey ofWestern Australia

Archaean basement

Department ofIndustry and Resources

Geological Survey ofWestern Australia

Break-up of Archaean continents

Department ofIndustry and Resources

Geological Survey ofWestern Australia

Assembly of West Australian Craton

Department ofIndustry and Resources

Geological Survey ofWestern Australia

Assembly of North Australian Craton

Department ofIndustry and Resources

Geological Survey ofWestern Australia

Assembly of South Australian Craton

Department ofIndustry and Resources

Geological Survey ofWestern Australia

Collision of West and North Australian Cratons

Department ofIndustry and Resources

Geological Survey ofWestern Australia

Palaeo- to Mesoproterozoic supercontinent: “Columbia”

Department ofIndustry and Resources

Geological Survey ofWestern Australia

Proterozoic Australia in Columbia

Department ofIndustry and Resources

Geological Survey ofWestern Australia

Was Australia “strung out”?

Department ofIndustry and Resources

Geological Survey ofWestern Australia

Docking with Laurentia

Department ofIndustry and Resources

Geological Survey ofWestern Australia

Intracratonic extension

Department ofIndustry and Resources

Geological Survey ofWestern Australia

Reorganisation: Collision with East Antarctica – Grenvillian events

Department ofIndustry and Resources

Geological Survey ofWestern Australia

Post-collision

Department ofIndustry and Resources

Geological Survey ofWestern Australia

Warakurna large igneous provinceMantle plume

Department ofIndustry and Resources

Geological Survey ofWestern Australia

Docking of Greater India

Department ofIndustry and Resources

Geological Survey ofWestern Australia

East Gondwana• 900 Ma

– Fitzsimons, 2003

Department ofIndustry and Resources

Geological Survey ofWestern Australia

Proterozoic Australia in the Rodinia supercontinent

Department ofIndustry and Resources

Geological Survey ofWestern Australia

Break-up of Rodinia - Centralian Superbasin and Adelaide Rift Complex

Department ofIndustry and Resources

Geological Survey ofWestern Australia

Peak Hill: Au

Mount Olympus: Au

Department ofIndustry and Resources

Geological Survey ofWestern 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 ofIndustry and Resources

Geological Survey ofWestern Australia

Kimberley-Arunta

Capricorn

Paterson

Albany-Fraser

West Musgrave

Pinjarra

Department ofIndustry and Resources

Geological Survey ofWestern 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 ofIndustry and Resources

Geological Survey ofWestern Australia

Kimberley-Arunta

Capricorn

Paterson

Albany-Fraser

West Musgrave

Pinjarra

Department ofIndustry and Resources

Geological Survey ofWestern Australia

Synthesis of the Australian Proterozoic• Proposed Geoscience Australia project in

collaboration with Tectonics Special Research Centre and State geological surveys

Department ofIndustry and Resources

Geological Survey ofWestern Australia

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