Iodine-rich waters involved in supergene enrichment of the Mantos de la Luna argentiferous copper deposit,Atacama Desert,Chile |
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| Authors: | Martin Reich Carlos Palacios Macarena Alvear Eion M Cameron Matthew I Leybourne Artur Deditius |
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| Institution: | (1) Departamento de Geología, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Santiago, Chile;(2) Eion Cameron Geochemical Inc., 865 Spruce Ridge Road, Carp, Ontario, K0A 1L0, Canada;(3) Ocean Exploration, GNS Science, P.O. Box 30-368, Lower Hutt, New Zealand;(4) Department of Geological Sciences, University of Michigan, Ann Arbor, MI, USA;(5) Present address: CSIRO Division of Exploration and Mining, 26 Dick Perry Avenue, Kensington, WA 6151, Australia |
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| Abstract: | Recent studies have suggested the involvement of highly saline deep formation waters that modified preexisting Cu assemblages
to form atacamite during supergene oxidation of Cu deposits in the Atacama region. In this report, we document the occurrence
of (Ag–I) inclusions hosted by supergene chalcocite from Mantos de la Luna, an argentiferous Upper Jurassic stratabound Cu
deposit in the Coastal Range of northern Chile. The presence of this unusual mineral assemblage indicates that iodargyrite
precipitated from reducing iodine-rich waters, suggesting that the fluids involved in supergene enrichment of Cu deposits
in the Coastal Range were more complex than previously thought. This suggests the prevalence of hyperarid conditions during
the latest stages of supergene enrichment of the Mantos de la Luna Cu deposit in the Atacama region, supporting the notion
that supergene enrichment processes in hyperarid areas are dynamic in nature and do not exclusively require the presence of
meteoric water. |
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