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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

By
S. A. Occhipinti
S. A. Occhipinti
Centre for Exploration Targeting, School of Earth and Environment, University of Western Australia, 35 Stirling Hwy, Crawley, Western Australia, 6009, Australia
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I. M. Tyler
I. M. Tyler
Geological Survey of Western Australia, 100 Plain Street East, Perth, Western Australia, 6004, Australia
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C. V. Spaggiari
C. V. Spaggiari
Geological Survey of Western Australia, 100 Plain Street East, Perth, Western Australia, 6004, Australia
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R. J. Korsch
R. J. Korsch
Formerly, Geoscience Australia, GPO Box 378, Canberra, ACT 2601, Australia
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C. L. Kirkland
C. L. Kirkland
Centre for Exploration Targeting, Department of Applied Geology, CurtinUniversity, Hayman Road, Bentley, Western Australia, Australia
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R. H. Smithies
R. H. Smithies
Geological Survey of Western Australia, 100 Plain Street East, Perth, Western Australia, 6004, Australia
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K. Martin
K. Martin
AngloGold Ashanti, Level 13, St Martins Tower, PO Box Z5046, Perth, Australia
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M. T. D. Wingate
M. T. D. Wingate
Geological Survey of Western Australia, 100 Plain Street East, Perth, Western Australia, 6004, Australia
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Published:
January 01, 2018

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.

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Contents

Geological Society, London, Special Publications

Characterization of Ore-Forming Systems from Geological, Geochemical and Geophysical Studies

K. Gessner
K. Gessner
Geological Survey of Western Australia, Australia
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T.G. Blenkinsop
T.G. Blenkinsop
Cardiff University, UK
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P. Sorjonen-Ward
P. Sorjonen-Ward
Geological Survey of Finland, Finland
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Geological Society of London
Volume
453
ISBN electronic:
9781786203342
Publication date:
January 01, 2018

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