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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/7313

Title: Mineralogy and geochemistry of El Dorado epithermal gold deposit, El Sauce district, central-northen Chile
Authors: Carrillo-Rosúa, Javier
Morales-Ruano, Salvador
Morata, Diego
Boyce, Adrian J.
Belmar, Mauricio
Fallick, Anthony E.
Fenoll Hach-Alí, Purificación
Issue Date: 2008
Abstract: The El Dorado Au-Cu deposit is located in an extensive intra-caldera zone of hydrothermal alteration affecting Upper Cretaceous andesites of the Los Elquinos Formation at La Serena (29º47´S Lat., 70º43’W Long., Chile). Quartz-sulfide veins of economic potential are hosted by N25W and N20E fault structures associated with quartz-illite alteration (+supergene kaolinite). The main ore minerals in the deposit are pyrite, chalcopyrite ± fahlore (As/(As+Sb): 0.06 – 0.98), with electrum, sphalerite, galena, bournonite-seligmanite (As/(As+Sb): 0.21 - 0.31), marcasite, pyrrhotite being accessory phases. Electrum, with an Ag content between 32 and 37 at. %, occurs interstitial to pyrite aggregates or along pyrite fractures. Pyrite commonly exhibits chemical zonation with some zones up to 1.96 at. % As. Electron probe microanalyses of pyrite indicate that As-rich zones do not exhibit detectable Au values. Fluid inclusion microthermometry shows homogenization temperatures between 130 and 352 ºC and salinities between 1.6 and 6.9 wt. % NaCl eq. Isotope data in quartz, ankerite and phyllosilicates and estimated temperatures show that 18O and D for the hydrothermal fluids were between 3 and 10‰ and between -95 and -75‰, respectively. These results suggest the mineralizing fluids were a mixture of meteoric and magmatic waters. An epithermal intermediate-sulfidation model is proposed for the formation of El Dorado deposit.
Sponsorship: Departamento de Mineralogía y Petrología. Departamento de Didáctica de las Ciencias Experimentales. Grupo de Investigación de la Junta de Andalucía RNM-0131. Proyecto BTE-2003-06265.
Publisher: Springer Verlag
Description: The original publication is available at www.springerlink.com
Keywords: Epithermal
Epitermal
Gold
Oro
Copper
Cobre
Chile
URI: http://hdl.handle.net/10481/7313
ISSN: 0930-0708
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Carrillo-Rosúa, J., Morales-Ruano, S., Morata, D., Boyce, A. J., Belmar, M., Fallick, A. E., & Fenoll Hach-Alí, P. (2008). Mineralogy and geochemistry of el Dorado epithermal gold deposit, el Sauce district, central-northern Chile. Mineralogy and Petrology, 92(3-4), 341-360. doi:10.1007/s00710-007-0203-7
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