Tropicana translated: A foreland thrust system imbricate fan setting for c. 2520 Ma orogenic gold mineralization at the northern margin of the Albany-Fraser Orogen, Western Australia
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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 foldand- 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.
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The affinity of Archean crust on the Yilgarn-Albany-Fraser Orogen boundary: Implications for gold mineralisation in the Tropicana ZoneKirkland, Chris; Spaggiari, C.; Smithies, R.; Wingate, M.; Belousova, E.; Gréau, Y.; Sweetapple, M.; Watkins, R.; Tessalina, Svetlana; Creaser, R. (2015)Craton margins can be subject to a wide array of gold genesis and redistribution processes, although high-grade terrains on craton margins are frequently viewed as less prospective than lower-grade counterparts. In contrast ...
Geochronological Constraints on the Tropicana Gold Deposit and Albany-Fraser Orogen, Western AustraliaDoyle, M.; Fletcher, Ian; Foster, J.; Large, R.R.; Mathur, R.; McNaughton, Neal; Meffre, S.; Muhling, Janet; Phillips, D.; Rasmussen, Birger (2015)Gold mineralization at the Tropicana mine occurs within the Plumridge terrane along the eastern margin of the Archean Yilgarn craton in the Albany-Fraser orogen, Western Australia. Mineralization is hosted in a favorable ...
Tectonic links between Proterozoic sedimentary cycles, basin formation and magmatism in the Albany–Fraser Orogen, Western AustraliaSpaggiari, C.V.; Kirkland, Chris; Smithies, R.; Wingate, M. (2014)Preserved in the Albany–Fraser Orogen are the remnants of two, regionally extensive basin systems — the c. 1815 to 1600 Ma Barren Basin and the c. 1600 to 1305 Ma Arid Basin. An extensive U–Pb zircon geochronology dataset ...