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Tracing back sulfur isotope reequilibration due to contact metamorphism: A case study from the Perubar VMS deposit, Central Peru

Presented at London, 1999
PublisherRotterdam : Balkema
Publication date1999
Abstract

The mid-Cretaceous Perubar VMS deposit, Central Peru, affected by contact metamorphism, has been the subject of a sulfur isotope investigation. The measured δ34S values for sulfate-sulfide pairs from the deposit indicate that close to equilibrium isotopic reequilibration occurred during metamorphism. After “filtering” the contact metamorphism effect, sulfur isotope desiquilibrium trends for coexisting sulfate-sulfide pairs were obtained on the δ34S versus Δ34S diagram, indicating a mixing between seawater sulfate and hydrothermal H2S. It suggests that contact metamorphism occurred in a closed system and that the original bulk sulfur isotope composition of the Perubar deposit was mostly preserved. Sulfur reequilibrated only locally, by isotope exchanges between adjacent sulfate and sulfide minerals.

Citation (ISO format)
POLLIAND, Marc, FONTBOTÉ, Lluís, SPANGENBERG, Jorge. Tracing back sulfur isotope reequilibration due to contact metamorphism: A case study from the Perubar VMS deposit, Central Peru. In: Mineral deposits: processes to processing, Proceedings of the 5th biennial SGA meeting. London. Rotterdam : Balkema, 1999. p. 967–970.
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