tectonic evolution and mineralization of the australian proterozoic
DESCRIPTION
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 PresentationTRANSCRIPT
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Department ofIndustry and Resources
Geological Survey ofWestern Australia
Tectonic evolution and mineralization of the
Australian Proterozoic Ian M. Tyler
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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
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Department ofIndustry and Resources
Geological Survey ofWestern Australia
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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
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Department ofIndustry and Resources
Geological Survey ofWestern Australia
Kimberley-Arunta
Capricorn
Paterson
Albany-Fraser
West Musgrave
Pinjarra
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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
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Department ofIndustry and Resources
Geological Survey ofWestern Australia
Tectonic models
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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
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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
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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
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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
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Department ofIndustry and Resources
Geological Survey ofWestern Australia
Magnetics
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Department ofIndustry and Resources
Geological Survey ofWestern Australia
Gravity
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Department ofIndustry and Resources
Geological Survey ofWestern Australia
Modified from Betts et al., 2002 (after Myers et al., 1996)
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Department ofIndustry and Resources
Geological Survey ofWestern Australia
Archaean basement
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Department ofIndustry and Resources
Geological Survey ofWestern Australia
Break-up of Archaean continents
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Department ofIndustry and Resources
Geological Survey ofWestern Australia
Assembly of West Australian Craton
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Department ofIndustry and Resources
Geological Survey ofWestern Australia
Assembly of North Australian Craton
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Department ofIndustry and Resources
Geological Survey ofWestern Australia
Assembly of South Australian Craton
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Department ofIndustry and Resources
Geological Survey ofWestern Australia
Collision of West and North Australian Cratons
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Department ofIndustry and Resources
Geological Survey ofWestern Australia
Palaeo- to Mesoproterozoic supercontinent: “Columbia”
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Department ofIndustry and Resources
Geological Survey ofWestern Australia
Proterozoic Australia in Columbia
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Department ofIndustry and Resources
Geological Survey ofWestern Australia
Was Australia “strung out”?
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Department ofIndustry and Resources
Geological Survey ofWestern Australia
Docking with Laurentia
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Department ofIndustry and Resources
Geological Survey ofWestern Australia
Intracratonic extension
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Department ofIndustry and Resources
Geological Survey ofWestern Australia
Reorganisation: Collision with East Antarctica – Grenvillian events
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Department ofIndustry and Resources
Geological Survey ofWestern Australia
Post-collision
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Department ofIndustry and Resources
Geological Survey ofWestern Australia
Warakurna large igneous provinceMantle plume
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Department ofIndustry and Resources
Geological Survey ofWestern Australia
Docking of Greater India
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Department ofIndustry and Resources
Geological Survey ofWestern Australia
East Gondwana• 900 Ma
– Fitzsimons, 2003
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Department ofIndustry and Resources
Geological Survey ofWestern Australia
Proterozoic Australia in the Rodinia supercontinent
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Department ofIndustry and Resources
Geological Survey ofWestern Australia
Break-up of Rodinia - Centralian Superbasin and Adelaide Rift Complex
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Department ofIndustry and Resources
Geological Survey ofWestern Australia
Peak Hill: Au
Mount Olympus: Au
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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
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Department ofIndustry and Resources
Geological Survey ofWestern Australia
Kimberley-Arunta
Capricorn
Paterson
Albany-Fraser
West Musgrave
Pinjarra
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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
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Department ofIndustry and Resources
Geological Survey ofWestern Australia
Kimberley-Arunta
Capricorn
Paterson
Albany-Fraser
West Musgrave
Pinjarra
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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
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Department ofIndustry and Resources
Geological Survey ofWestern Australia