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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/38950

Title: Unconventional non-magmatic sulfur source for the Mazarrón Zn-Pb-Cu-Ag epithermal deposit (SE Spain)
Authors: Esteban-Arispe, Iñaki
Velasco-Roldán, Francisco
Boyce, Adrian J.
Morales-Ruano, Salvador
Yusta, Iñaki
Carrillo-Rosúa, Javier
Issue Date: 2015
Abstract: Geological evidence and mineralogical, fluid inclusion temperature and geochemistry data suggest that the Mazarrón Zn-Pb-Cu-Ag-Fe deposit is a volcanic-hosted epithermal deposit. It is hosted by dacites with advanced argillic alteration, argillic alteration, propylitic alteration and silicification halos. K-Ar dating of illite from the argillic alteration gives an age of 9.7 ± 1.2 Ma, which suggests that mineralization took place very close to the volcanism. The fluid inclusion study in the ore veins shows epithermal temperatures (between 190 and 260ºC), but moderate salinities, between 12 and 18 wt. % NaCl eq), compatible with mixing between surface waters and polygenic deep hydrothermal fluids. Two mineralization types are identified: iron sulfide mineral association and polymetallic mineral association (sphalerite-galena-chalcopyrite-fahlore bearing). According to isotopic data, the first mineralization was mainly formed by interaction between basinal fluids that leached Triassic sulfates (+ surface waters), and C-bearing reduced deep waters. This interaction developed a Thermochemical Sulfate Reduction (TSR) supporting extreme and geologically unusual fractionation, with a range up to +30‰ δ34S, and reaching +53‰ δ34S. The second mineralization event is compatible with the irruption of a magmatic fluid discharge. Although this study suggests that Mazarron could be classified as an intermediate sulfidation deposit, the genetic model includes processes such as TSR that are not typical features of volcanic-hosted epithermal deposits.
Sponsorship: Universidad de Granada. Departamento de Mineralogía y Petrología
Instituto Andaluz de Ciencias de la Tierra (UGR-CSIC)
Universidad del País Vasco. Departamento de Mineralogía y Petrología
Scottish Universities Environmental Research Centre (SUERC)
Universidad de Granada. Departamento de Didáctica de las Ciencias Experimentales
Grupo de Investigación Mineralogía, Petrología y Yacimientos Minerales (GIMPY) (RNM131) de la Junta de Andalucía.
Grupo de Investigación Didáctica de las Ciencias Experimentales y de la Sostenibilidad (HUM613)de la Junta de Andalucía
This research has been supported by the Project of ExcellenceP05-RNM-0736 (founded by Consejería de Innovación, Ciencia y Empresa, Junta de Andalucia, Spain) and the Spanish projectCGL-2006-02594-BTE (founded by Ministry of Science and Innovation/Ministry of Education and Science and Fondo Europeo de Desarrollo Regional, FEDER).
Publisher: Elsevier
Description: Este documento corresponde a una versión PREPINT (versión enviada originalmente a la revista, previa a las modificaciones sugeridas por los revisores). El artículo final ha sido publicado originalmente por la revista Ore Geology Review de la Editorial Elsevier. La URL del mismo es: http://dx.doi.org/10.1016/j.oregeorev.2015.10.005
This is a PREPRINT version (pre-refereeing process version). The final article has been published in Ore Geology Review by Elsevier. The URL is: http://dx.doi.org/10.1016/j.oregeorev.2015.10.005
Keywords: Unconventional epithermal volcanic-hosted
SE Spain
Stable and radiogenic isotopes
Thermochemical sulfate reduction
Depósitos eptiermales encajados en rocas volcánicas no convencional
SE de España
Termo sulfato-reducción
Isótopos estables y radiogénicos
URI: http://hdl.handle.net/10481/38950
ISSN: 0169-1368
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Esteban-Arispe, I.; Velasco-Roldán, F.; Boyce, A.J.; Morales-Ruano, S.; Yusta, I.; Carrillo-Rosúa, J. Unconventional non-magmatic sulfur source for the Mazarrón Zn-Pb-Cu-Ag-Fe epithermal deposit (SE Spain). Ore Geology Reviews: online (2015). [http://hdl.handle.net/10481/38950] (preprint version)
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