Cooke, DR, Porphyry Cu-Au-Mo deposits, Abstracts from the FUTORES II Conference - Future Understanding of Tectonics, Ores, Resources, Environment and Sustainability, 04-07 June 2017, James Cook University, Townsville, QLD, pp. 25. (2017) [Keynote Presentation]
Official URL: https://www.jcu.edu.au/futores
Porphyry deposits are associated with oxidized hydrous intrusive complexes. Multiple episodes of magmatism are typical, with mineralisation commonly associated with early stages. Exceptions occur, whereby mineralisation is associated with late-stage intrusions. Controls on the mineralising capacity of individual intrusions remain obscure. Whole rock and mineral chemistry signatures of fertile intrusive complexes associated with porphyry mineralization are currently the subject of intensive research. These features are likely to facilitate future greenfields and brownfields exploration targeting.
Mineralisation and alteration is localised around the apex of the mineralising intrusive complexes. There is typically an evolution spatially from early proximal potassic to distal propylitic assemblages. Late-stage alteration assemblages overprint the potassic and propylitic assemblages, and are zoned from deep phyllic to shallow advanced argillic assemblages. Ore is associated with high temperature potassic assemblages and has an early timing in many deposits. In some, significant mineralisation is associated with the late-stage clay- and mica-rich alteration assemblages. Reasons for these variations remain obscure, and should stimulate further refinement to the porphyry copper model.
|Item Type:||Keynote Presentation|
|Keywords:||porphyry, copper, gold, molybdenum, geodynamics, mineralisation, alteration|
|Research Division:||Earth Sciences|
|Research Field:||Ore Deposit Petrology|
|Objective Division:||Mineral Resources (excl. Energy Resources)|
|Objective Group:||Mineral Exploration|
|Objective Field:||Copper Ore Exploration|
|UTAS Author:||Cooke, DR (Professor David Cooke)|
|Funding Support:||Australian Research Council (IH130200004)|
|Deposited By:||CODES ARC|
|Downloads:||1 View Download Statistics|
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