THE GEOLOGY OF THE EAST ALBANY–FRASER OROGEN — A FIELD GUIDE
The Albany–Fraser deep reflection seismic and MT survey ...
Transcript of The Albany–Fraser deep reflection seismic and MT survey ...
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Government of Western Australia Department of Mines and Petroleum
Geological Survey of Western Australia
The Albany–Fraser deep reflection seismic and MT survey: Implications for
mineral systems Ian Tyler, Catherine Spaggiari, Sandi Occhipinti (CET), Chris Kirkland and Hugh Smithies
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Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum
Mineral Deposits: MINEDEX
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Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum
Major Resource Projects
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Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum
Major Resource Projects
• Tropicana Gold Mine (Tropicana JV: AngloGold Ashanti, Independence Group) – 7.89 million ounces Au
• Discovered 2005
• Nova Ni-Cu-Co (Sirius Resources) – 242 kt Ni, 100 kt Cu and 7.7 kt Co
• Discovered 2012
• Trilogy Pb-Zn-Ag-Cu-Au (Silver Lake Resources) – 163 000 oz Au, 9.3 million oz Ag, 65 t Cu
• Discovered 1997 (Homestake Gold of Australia)
• Southdown magnetite Fe (Grange Resources) – 1 256.9 Mt @ 33.7%
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Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum
Albany–Fraser Orogen
• Fundamental role of the Archean Yilgarn Craton in the evolution of Albany–Fraser Orogen
• Yilgarn Craton with a ‘make-over’ • The Albany–Fraser Orogen is not
simply a Mesoproterozoic collision zone — no internal suture
• Records a long history of extensional tectonics (basins, magmatism) as well as thrust tectonics (long-lived structures)
AFO is part of the West Australian Craton (WAC)
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Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum
Metallogenic Settings in Lithospheric Context
Minerals Targeting International PL
Giant magmatic & hydrothermal ore deposits controlled by mantle structures and combined mantle-crustal processes
MANTLE STRUCTURES IN KEY SETTINGS
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Depth(kilometres)
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ContinentalLithosphere
AlteredLithosphere
AsthenosphericMantle
OceanicLithosphereCrust
Cu, Au (Escondida, Yanacocha)
Cu/Au, Au (Olympic
Dam, Muruntau)
NiS, Pb-Zn (W Musgraves,
Mt.Isa)
Diamonds NiS
(Norilsk)
Plume impacted on base of lithosphere
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Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum
Mineral Systems: Yilgarn margin and Albany–Fraser Orogen
1. Neoarchean (c. 2500 Ma) thrust-related shear zone Au hosted in amphibolite to granulite facies ortho and paragneisses (Tropicana, Tropicana east);
2. Paleoproterozoic (c.1760 Ma) intrusion-related Au-Ag (Voodoo Child);
3. Paleoproterozoic stratabound (c. 1700 Ma) sedimentary clastic-hosted Pb-Zn-Ag-Cu-Au (Trilogy);
4. Paleoproterozoic (1800-1600 Ma) magnetite iron ore (Southdown);
5. Mesoproterozoic (c. 1300 Ma) orthomagmatic mafic intrusion-related Ni-Cu-Co (Nova).
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Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum
Mineral Systems: Yilgarn margin and Albany–Fraser Orogen
• Magmatic – Neoarchean c. 2700 Ma sanukitoid-related gold/orogenic lode-gold – Proterozoic (c. 1800, 1660, 1210 Ma) mafic intrusion-related Ni – Proterozoic intrusion-related Au-Cu (c. 1800, 1660, 1300 Ma) – Esperance Supersuite (1200–1140 Ma)
• Sn-W • IOCG
• Proterozoic shear-related Au (c. 1800, 1690, 1300, 1200–1140 Ma)
• Proterozoic Basins (1800–1600, 1600–1330 Ma) – VMS – SEDEX
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Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum
Albany–Fraser Orogen
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Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum
Tectonic events older than 2000 Ma
Plumridge Detachment
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Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum
Tropicana Zone: Tropicana (Tropicana JV) and Tropicana East (Beadell Resources)
Excerpt from Plate 1
Voodoo Child
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Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum
Tropicana Zone: 12GA–T1
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Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum
Where did the Tropicana Zone come from? • Parautochtonous
– 2520 Ma thrust on Plumridge Detachment onto Yamarna Terrane
• c. 2720 Ma sanukitoids – (metasomatised mantle above subducting slab) – Same age as EG komatiites
• Tectonic setting: SE Yilgarn Craton margin – Continental margin/arc terrane – Granulite facies in mid-crust during c. 2650 Ma Au
event in EG – Link to Gunnadorrah Seismic Province?
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Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum
Tropicana Zone
Narryer Terrane
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Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum
12GA–AF3
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Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum
Tectonic events younger than 2000 Ma
Southdown
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Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum
Tropicana Zone: Voodoo Child (AngloGold Ashanti) — Ngadju Event
Excerpt from Plate 1
Voodoo Child
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Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum
Voodoo Child Au-Ag
• Intrusion-related (T Less, 2013) – Dacitic volcanics
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Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum
Trilogy (Au-Cu-Ag-Pb-Zn) and Southdown (magnetite Fe)
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Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum
Trilogy (Silver Lake Resources): SEDEX?
• c. 1700 Ma clastic-hosted stratabound sedimentary deposit (Sampson and Bourne, 2001) – graphitic phyllites
• Polymetallic massive sulfide mineralization – Pb-Zn-Ag sulfides – Cu-Au stringers
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Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum
Jerdacuttup Fault: Yilgarn Youanmi Terrane/Northern Foreland boundary
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Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum
Southdown magnetite Fe (Grange Resources)
• Biranup Zone – Metamorphosed iron-rich sedimentary rocks – Granulite Facies
• Magnetite (+pyroxene, +garnet)
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Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum
Barren Basin
• Fe-rich sedimentary rocks • SEDEX and VMS
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Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum
Tectonic events younger than 2000 Ma
Southdown
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Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum
Nova (Sirius Resources)
From Mark Bennett’s presentation at CET Discovery Day, February 2014
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Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum
Mesoproterozoic (c. 1300 Ma) orthomagmatic mafic intrusion-related Ni-Cu-Co
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Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum
12GA–AF3
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Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum
Mesoproterozoic (c. 1300 Ma) orthomagmatic mafic intrusion-related Ni-Cu-Co
• Primary magmatic nickel sulphide – pyrrhotite, pentlandite and chalcopyrite
• Gabbroic mafic granulites above easterly dipping shear zones
• Thrust from deeper in the crust, after intrusion in lower crustal hot zone
• Link to Gunnadorrah Seismic Province?
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Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum
• Emplaced during Albany–Fraser Stage I
Mesoproterozoic (c. 1300 Ma) orthomagmatic mafic intrusion-related Ni-Cu-Co
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Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum
Proterozoic shear-related Au
• Beachcomber • Corvette
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Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum
Proterozoic intrusion-related deposits
• Eddy Suite • Recherche and Esperance Supersuites • Marnda Moorn large igneous province
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Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum
Future EIS work to further define large-scale crustal architecture
• Eucla–Gawler reflection seismic and MT line – Reflection seismic acquisition completed – MT acquisition
• Eucla stratigraphic drilling – Two holes May–June
• Passive seismic (ARC Linkage with ANU) – 1st deployment in November 2013
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Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum Government of Western Australia Department of Mines and Petroleum
Sutures east of the Albany–Fraser Orogen: Rodona Shear Zone?