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dc.contributor.author Maydagán, Laura
dc.contributor.author Franchini, Marta Beatriz
dc.contributor.author Impiccini, Agnes
dc.contributor.author Lentz, David
dc.contributor.author Patrier, Patricia
dc.contributor.author Beaufort, Daniel
dc.date.available 2018-10-29T20:26:25Z
dc.date.issued 2018-01
dc.identifier.citation Maydagán, Laura; Franchini, Marta Beatriz; Impiccini, Agnes; Lentz, David; Patrier, Patricia; et al.; Chlorite, white mica and clay minerals as proximity indicators to ore in the shallow porphyry environment of Quebrada de la Mina deposit, Argentina; Elsevier Science; Ore Geology Reviews; 92; 1-2018; 297-317
dc.identifier.issn 0169-1368
dc.identifier.uri http://hdl.handle.net/11336/63252
dc.description.abstract The mineralogy and chemical composition of mica-like phyllosilicates (>2 µm) and clay fraction (<2 µm) of the shallow hydrothermal alteration zones of the Quebrada de la Mina Cu-Au deposit (San Juan Province, Argentina) were constrained by petrography, XRD, electronic microprobe and IR. The results allow us to identify: (1) relict patches of quartz + K-feldspar ± rutile (potassic) alteration, (2) a peripheral clinochlore-rich propylitic halo, and (3) a central white mica (>2 µm) and illite halo associated with phyllic and tourmaline-rich phyllic assemblages. The subhorizontal, shallow level Au-rich (>0.5 ppm Au) zone at the Quebrada de la Mina deposit coincides with the phyllic halo. The distribution of Au, Ag, Zn, Pb and As forms partially overlapping haloes toward shallower levels. Weak Cu (Mo) anomalies were found in potassic patches below the Au-rich zone. High Mn and Fe contents in clinochlore from the peripheral propylitic halo suggest a distance of ∼1 km to a porphyry Cu-(Au) mineralized core at deeper levels. White micas (>2 µm) in Quebrada de la Mina show a range of compositions between muscovite and illite. In the propylitic halo and in the patches of potassic alteration, white micas (>2 µm) show the highest values of Fe + Mg + Mn (0.40–0.55 apfu) and the lowest of Al (2.40–2.55 apfu). In the phyllic alteration zone of Quebrada de la Mina, white micas (>2 µm) with Al contents between 2.45 and 2.70 apfu and Fe + Mg + Mn between 0.35 and 0.15 apfu match the areas with high gold content (>0.5 ppm Au). The lowest values of Fe + Mg + Mn (0.11–0.05 apfu) and the highest Al contents (2.80–2.85 apfu) occur in white micas from the tourmaline-rich phyllic zone. Values of the Kübler index of illite of 0.19–0.1 2θ in the clay fraction of deep samples are indicative of higher temperature and/or higher fluid/rock ratios during illite formation, compared to values of the Kübler index > 0.2 2θ recognized in shallow samples. Thus, both the compositional variations in chlorite and white micas and the illite crystallinity could be used as a guide for exploration of copper-gold mineralization in shallow levels of porphyry systems.
dc.format application/pdf
dc.language.iso eng
dc.publisher Elsevier Science
dc.rights info:eu-repo/semantics/restrictedAccess
dc.rights.uri https://creativecommons.org/licenses/by-nc-nd/2.5/ar/
dc.subject CLAYS
dc.subject HYDROTHERMAL ASSEMBLAGES
dc.subject PHYLLOSILICATES
dc.subject PORPHYRY DEPOSIT
dc.subject.classification Geología
dc.subject.classification Ciencias de la Tierra y relacionadas con el Medio Ambiente
dc.subject.classification CIENCIAS NATURALES Y EXACTAS
dc.title Chlorite, white mica and clay minerals as proximity indicators to ore in the shallow porphyry environment of Quebrada de la Mina deposit, Argentina
dc.type info:eu-repo/semantics/article
dc.type info:ar-repo/semantics/artículo
dc.type info:eu-repo/semantics/publishedVersion
dc.date.updated 2018-10-22T19:01:12Z
dc.journal.volume 92
dc.journal.pagination 297-317
dc.journal.pais Países Bajos
dc.journal.ciudad Amsterdam
dc.description.fil Fil: Maydagán, Laura. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca. Instituto Geológico del Sur. Universidad Nacional del Sur. Departamento de Geología. Instituto Geológico del Sur; Argentina. Universidad Nacional del Comahue. Facultad de Ingeniería. Departamento de Geología y Petróleo; Argentina
dc.description.fil Fil: Franchini, Marta Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Patagonia Norte; Argentina. Universidad Nacional de Río Negro. Sede Alto Valle. Instituto de Investigaciones en Paleobiología y Geología; Argentina. Universidad Nacional del Comahue. Facultad de Ingeniería. Departamento de Geología y Petróleo; Argentina
dc.description.fil Fil: Impiccini, Agnes. Universidad Nacional del Comahue. Facultad de Ingeniería. Departamento de Geología y Petróleo; Argentina
dc.description.fil Fil: Lentz, David. University of New Brunswick; Canadá
dc.description.fil Fil: Patrier, Patricia. Centre National de la Recherche Scientifique; Francia. Université de Poitiers; Francia
dc.description.fil Fil: Beaufort, Daniel. Centre National de la Recherche Scientifique; Francia. Université de Poitiers; Francia
dc.journal.title Ore Geology Reviews
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.oregeorev.2017.11.028
dc.relation.alternativeid info:eu-repo/semantics/altIdentifier/url/https://www.sciencedirect.com/science/article/pii/S0169136817306108
dc.conicet.fuente individual


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info:eu-repo/semantics/restrictedAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Atribución-NoComercial-SinDerivadas 2.5 Argentina (CC BY-NC-ND 2.5 AR)