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Metal transport and ore deposition in porphyry copper ± gold ± molybdenum deposits - contrasting behaviour between deep and shallow environments

Citation

Cooke, DR and Braxton, DP and White, NC and Rinne, M, Metal transport and ore deposition in porphyry copper ± gold ± molybdenum deposits - contrasting behaviour between deep and shallow environments, Proceedings of the Society for Geology Applied to Mineral Deposits Conference 2015: Mineral Resources in a Sustainable World, 24-27 August 2015, Nancy, France, pp. 275-278. ISBN 978-2-85555-065-7 (2015) [Refereed Conference Paper]


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Abstract

High-grade zones typically develop in the Ksilicate- altered centre of porphyry deposits, where copper gold molybdenum are localised in and around the apex of the intrusion. Mineralisation develops in spatial and temporal association with abundant quartz magnetite orthoclase biotite anhydrite as veins, breccia cement and alteration minerals. Multiple generations of stockwork veins magmatic-hydrothermal breccias are common and provide evidence for repeated cycles of fluid release from the magma reservoir. Unmixing of brines and vapours from supercritical fluids (deep-level porphyries) and/or direct exsolution of these two phases from the intrusive complex (shallow-level porphyries) are essential prerequisites to ore formation. The brines contain most or all of the oreforming components, and have densities that restrict their occurrence to the apex and shoulders of the mineralising intrusion, where potassic alteration and mineralisation occurs. The vapour passes through the mineralised centre of porphyry deposits, ascending rapidly to the nearsurface environment, where it may form a lithocap.

Item Details

Item Type:Refereed Conference Paper
Keywords:porphyry, copper, hydrothermal fluids, ore formation
Research Division:Earth Sciences
Research Group:Geology
Research Field:Ore Deposit Petrology
Objective Division:Mineral Resources (excl. Energy Resources)
Objective Group:Other Mineral Resources (excl. Energy Resources)
Objective Field:Mineral Resources (excl. Energy Resources) not elsewhere classified
Author:Cooke, DR (Professor David Cooke)
Author:Rinne, M (Mr Marc Rinne)
ID Code:107008
Year Published:2015
Funding Support:Australian Research Council (CE0561595)
Deposited By:Centre for Ore Deposit Research - CODES CoE
Deposited On:2016-03-01
Last Modified:2017-11-02
Downloads:11 View Download Statistics

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