Cerros Amarillos: an alteration porphyry type system, Upper Miocene, Cordillera Principal, Mendoza

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Nora Rubinstein
Patricia Sruoga
Mariela Etcheverría

Abstract

In the Cerros Amarillos area, Cordillera Principal of Mendoza province, Argentina (35°S, 70°W) it crops out an alteration zone which is spatially linked to volcanics of Upper Miocene age. It is characterized by early potassic alteration with a paragenesis of biotite-magnetite. It is overprinted by a sericita-silica-carbonate paragenensis with associated albite. This later stage corresponds to a high level albite-sericite association which is prior to the phyllic alteration stage. Endoskarn facies comprising pyroxene breccias and plagioclase-pyroxene veins also crops out in the area. The recognized paragenesis points to a porphyry system with sodic alteration. The stratigraphic controls and the geochronological data suggest a genetically link with the Upper Miocene magmatism

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Rubinstein, N., Sruoga, P., & Etcheverría, M. (2009). Cerros Amarillos: an alteration porphyry type system, Upper Miocene, Cordillera Principal, Mendoza. Revista De La Asociación Geológica Argentina, 65(3), 566-570. Retrieved from https://revista.geologica.org.ar/raga/article/view/929
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