Revista de la Asociación Geológica Argentina
Print version ISSN 0004-4822
KORZENIEWSKI, Lidia I; RUBINSTEIN, Nora and GOMEZ, Anabel. Fluid inclusion analyses in polymetallic veins linked to the San Pedro porphyry copper deposit, Mendoza province, Argentina. Rev. Asoc. Geol. Argent. [online]. 2012, vol.69, n.1, pp. 13-18. ISSN 0004-4822.
The San Pedro porphyry copper deposit, located in the southern part of the San Rafael, Massif, Mendoza province, Argentina, develops an alteration halo in volcanic rocks of the Choiyoi Magmatic Cycle. Close to this alteration halo a group of polymetallic veins that were genetically linked to the disseminated deposit based on stratigraphic data crops out. Fluid inclusions petrographic and microthermometric studies carried on in samples from these veins confirm this genetic link and allow establishing two stages in the evolution of this hydrothermal system. The first stage with high salinity (37.5-41%) and temperature (356-389°C) magmatic fluids produce potassic alteration and Cu mineralization. During the second stage diluted magmatic fluids with low temperatures (176-276°C) and salinities (0.35-8.68%) led to phyllic alteration.
Keywords : Fluid inclusions; Mineralizing fluids conditions; Polymetallic veins; San Pedro porphyry copper; San Rafael Massif.