Ore fluid chemistry in super-giant porphyry copper deposits

Wilkinson, J.J., Wilkinson, C.C., Vry, V.H., Rusk, B.G., Seguel, J., Zentilli, M., and Jeffries, T.E. (2008) Ore fluid chemistry in super-giant porphyry copper deposits. In: Proceedings of PACRIM Congress 2008, pp. 295-299. From: PACRIM Congress 2008 , 24 - 26 November 2008, Gold Coast, QLD, Australia.

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Abstract

Laser ablation inductively Coupled Plasma Mass Spectrometry (ICPMS) analysis of fluid inclusions trapping mineralising solutions in major porphyry-copper deposits indicates that copper concentrations can reach 10_3 - 10_4 ppm in both dilute, CO_2 -bearing fluids and in high salinity brines. Non-C1 transport of Cu is implicated. Au has been determined at 0.2 - 0.4 ppm in the low salinity fluids and may be co-transported with Cu. In contrast, high concentrations of Fe, Mn, Zn and Pb are only attained in brines and correlate strongly with Cl-indicating chloride transport. Physical and/or temporal separation of these fluid types can therefore produce metal fractionation within porphyry systems. Evidence concerning the behaviour of Mo is less clear but brine transport appears to be favoured; phase separation is one mechanism that may account for the fractionation of Mo from Cu and the formation of quartz-molybdenite veins.

Item ID: 7691
Item Type: Conference Item (Refereed Research Paper - E1)
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Conference theme "The Pacific Rim: Mineral Endowment, Discoveries & Exploration Frontiers"

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ISBN: 978-1-920806-93-4
Date Deposited: 10 Jun 2010 23:00
FoR Codes: 04 EARTH SCIENCES > 0402 Geochemistry > 040201 Exploration Geochemistry @ 100%
SEO Codes: 84 MINERAL RESOURCES (excl. Energy Resources) > 8401 Mineral Exploration > 840102 Copper Ore Exploration @ 100%
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