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

Thompson, JA, Baker, M ORCID: 0000-0002-8050-7631, Cooke, DR ORCID: 0000-0003-3096-5658, Leys, C and Chen, H 2017 , 'Vectors to mineralization in the carbonate-hosted Grasberg-Ertsberg porphyry district from calcite C-O isotope and trace element geochemistry', in Proceedings of the 14th SGA Biennial Meeting: Mineral Resources to Discover , Society for Geology Applied to Mineral Deposits, pp. 1107-1110 .

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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 Type: Conference Publication
Authors/Creators:Thompson, JA and Baker, M and Cooke, DR and Leys, C and Chen, H
Keywords: carbon, oxygen, isotopes, porphyry, copper, gold, Grasberg, calcite
Journal or Publication Title: Proceedings of the 14th SGA Biennial Meeting: Mineral Resources to Discover
Publisher: Society for Geology Applied to Mineral Deposits
Copyright Information:

Copyright 2017 Society for Geology Applied to Mineral Deposits

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