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Vectors to mineralization in the carbonate-hosted Grasberg-Ertsberg porphyry district from calcite C-O isotope and trace element geochemistry

Citation

Thompson, JA and Baker, M and Cooke, DR and Leys, C and Chen, H, Vectors to mineralization in the carbonate-hosted Grasberg-Ertsberg porphyry district from calcite C-O isotope and trace element geochemistry, Proceedings of the 14th SGA Biennial Meeting: Mineral Resources to Discover, 20-23 August 2017, Quebec City, Canada, pp. 1107-1110. ISBN 9782981689801 (2017) [Refereed Conference Paper]


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Abstract

Trace element analyses of calcite veins, marbles, and skarn in the Grasberg-Ertsberg district reveal distinctive characteristics in distal and proximal skarn and porphyry environments. C-O isotopic values correlate with trace element variations and both can be attributed to magmatic fluid mixing with rock-buffered meteoric waters. A negative correlation is observed between δ18O and Mn:Mg values, which change systematically towards the center of the Grasberg Intrusive Complex (GIC). Evidence for fluid migration for up to 5km away from the GIC along permeable fracture and fault networks is indicated by magmatic-hydrothermal signatures in distal calcite vein chemistry. Isotopic and trace element analyses of calcite present a new and potentially effective tool for the detection of porphyry deposits in carbonate-hosted terrains which to date have proven challenging to explore.

Item Details

Item Type:Refereed Conference Paper
Keywords:carbon, oxygen, isotopes, porphyry, copper, gold, Grasberg, calcite
Research Division:Earth Sciences
Research Group:Geology
Research Field:Ore Deposit Petrology
Objective Division:Mineral Resources (excl. Energy Resources)
Objective Group:Mineral Exploration
Objective Field:Precious (Noble) Metal Ore Exploration
Author:Thompson, JA (Mrs Jennifer Thompson)
Author:Baker, M (Dr Michael Baker)
Author:Cooke, DR (Professor David Cooke)
ID Code:122940
Year Published:2017
Funding Support:Australian Research Council (IH130200004)
Deposited By:CODES ARC
Deposited On:2017-12-06
Last Modified:2017-12-07
Downloads:0

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