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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Australasia
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Australia
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Western Australia
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Eastern Goldfields (1)
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Fraser Range (3)
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Yilgarn Craton (1)
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Europe
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Western Europe
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United Kingdom
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Great Britain
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Scotland
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Moine thrust zone (1)
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commodities
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metal ores
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copper ores (1)
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gold ores (1)
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nickel ores (1)
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mineral deposits, genesis (1)
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elements, isotopes
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metals
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platinum group
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palladium (1)
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geologic age
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Precambrian
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Archean
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upper Precambrian
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minerals
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phosphates
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sulfides (1)
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Primary terms
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Australasia
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Australia
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Western Australia
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Eastern Goldfields (1)
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Fraser Range (3)
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Yilgarn Craton (1)
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crust (1)
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deformation (1)
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Europe
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Western Europe
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United Kingdom
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faults (1)
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mantle (1)
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metal ores
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copper ores (1)
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metals
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Precambrian
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Archean
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Neoarchean (1)
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upper Precambrian
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tectonics (2)
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Fraser Range
Compositions and Ni-Cu-PGE Tenors of Nova-Bollinger Ores with Implications for the Origin of Pt Anomalies in PGE-Poor Massive Sulfides
Abstract Neoarchean rocks of the Tropicana Zone, including granites with subduction-zone affinities, formed in a terrane adjacent to, or on the margin of, the Yilgarn Craton at the commencement of a long-lived, amphibolite to granulite facies event – the 2722–2554 Ma Atlantis Event. Early stages of this event overlap with extensive komatiite emplacement within the Eastern Goldfields Superterrane (Yilgarn Craton), suggestive of a plume-related rift environment, which was followed by 2660–2630 Ma greenschist facies, orogenic gold mineralization. This indicates differences in the tectonic evolution of the Tropicana Zone compared with within the craton, although isotopic data show similarities in crustal sources. At c. 2520 Ma, the Tropicana Zone was retrogressed to greenschist facies as it was thrust onto the Yamarna Terrane (Yilgarn Craton), forming a northwesterly directed fold-and-thrust belt above the flat-lying Plumridge Detachment. This fold-and-thrust belt is host to the c. 2520 Ma, Tropicana gold deposit. The Plumridge Detachment may extend north to the Yamarna greenstone belt, linking to the Yamarna Shear Zone – the boundary between the Burtville and Yamarna Terranes. The fertility of the Tropicana Zone is related to its Neoarchean geodynamic setting within a continental arc environment, implying that deformed margins of Archean cratons may be prospective for Neoarchean Au deposits.