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Noble gas and halogen constraints on fluid sources in iron oxide-copper-gold mineralization: Mantoverde and La Candelaria, Northern Chile

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Abstract

The noble gas (Ar, Kr, Xe) and halogen (Cl, Br, I) composition of fluid inclusions in hydrothermal quartz and calcite related to the hypogene iron oxide-copper-gold (IOCG) mineralization at Mantoverde and Candelaria, Chile, have been investigated to provide new insights of fluid and salinity sources in Andean IOCG deposits. A combination of mechanical extraction by crushing and thermal decrepitation methods was applied and collectively indicate that fluid inclusions with salinities ranging from 3.4 up to 64 wt% NaCl equivalent have molar Br/Cl and I/Cl ratios of between 0.5 × 10−3 and 3.0 × 10−3 and I/Cl of between 8 × 10−6 and 25 × 10−6 in the majority of samples, with maximum values of 5.2 × 10−3 obtained for Br/Cl and 64 × 10−6 for I/Cl in fluid inclusions within individual samples. The fluid inclusions have age-corrected 40Ar/36Ar ratios ranging from the atmospheric value of 296 up to 490 ± 45, indicating the presence of crustal- or mantle-derived excess 40Ar in the fluid inclusions of most samples. The fluid inclusions have 84Kr/36Ar and 130Xe/36Ar ratios intermediate of air and air-saturated water. However, 40Ar/36Ar is not correlated with either 84Kr/36Ar or 130Xe/36Ar, and the fluid inclusion 36Ar concentrations of 0.2–3.5 × 10−10 mol/g (calculated from measured Cl/36Ar and thermometric salinity measurements) extend below the seawater value of 0.34 × 10−10 mol/g, suggesting that contamination with modern air is a minor artifact. The range of fluid inclusion Br/Cl and I/Cl ratios overlap those previously documented for the mantle and magmatic-hydrothermal ore deposits, and the fluids’ unusually low 36Ar concentration is consistent with the involvement of magmatic-hydrothermal fluids. Input of additional non-magmatic fluid components is suggested by the spread in Br/Cl and I/Cl to values characteristic of bittern brine sedimentary formation waters and near atmospheric 40Ar/36Ar. These data are compatible with mixing of magmatic-hydrothermal fluids and evaporated seawater, which was modified by interaction with back-arc basin sediments as the major control on ore formation. Low Br/Cl (<0.5 × 10−3) and I/Cl (<5.0 × 10−6) values that would provide evidence for evaporite dissolution as an important source of fluid salinity were not detected.

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Acknowledgments

We thank A.A. Rieger for sample preparation and M. Díaz and AngloAmerican Chile, Mantoverde Division, for their support. Many thanks also to C.C. Mineral Candelaria and to all members of the Geology Department for their constant support over many years. Comments by G. Beaudoin, F. Barra, and two anonymous reviewers are greatly appreciated.

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  1. Department of Earth and Environmental Sciences, Ludwig-Maximilians Universität, Luisenstrasse 37, 80333, Munich, Germany

    Robert Marschik

  2. Research School of Earth Sciences, Australian National University, Canberra, ACT, 0200, Australia

    Mark A. Kendrick

  3. School of Earth Sciences, The University of Melbourne, Melbourne, Victoria, 3010, Australia

    Mark A. Kendrick

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Marschik, R., Kendrick, M.A. Noble gas and halogen constraints on fluid sources in iron oxide-copper-gold mineralization: Mantoverde and La Candelaria, Northern Chile. Miner Deposita 50, 357–371 (2015). https://doi.org/10.1007/s00126-014-0548-x

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