Aporte al conocimiento de la geología del pórfido El Arriero y su zona de alteración, sierra de La Huerta, San Juan, Argentina

CASTRO DE MACHUCA, BRÍGIDA; CONTE-GRAND, ALICIA; SUMAY, CELINA; MUGAS, CECILIA; GARCÉS, PEDRO; MEISSL, ESTELA; PONTORIERO, SANDRA; ALIAGA, CARLOS

Buenos Aires

Congreso; VIII Congreso Argentino de Geología Económica; 2005

Asociación Argentina de Geólogos Economistas

New data concerning the geology of El Arriero dacitic porphyry and its alteration zone, La Huerta range, Western Pampean Ranges, is reported. Works carried out in the area demonstrate that hydrothermal alteration and ore deposition are directly related to the gondwanic magmatic activity. Two main alteration/mineralization episodes are recognized: a restricted potassic-phyllic one overprinted by a more intense and widely extended pervasive propylitic one. Disseminated Py±Ccp±Mag as well as Qtz±Kfs+Py±Ccp, Qtz+Py±Ccp±Mo and Cal+Py veinlets are related to the hydrothermal alteration. Nevertheless, the analyses of several other factors do not allow consider the area as an economically valuable zone.