INVESTIGADORES
CASTRO Brigida Marta Ester
congresos y reuniones científicas
Título:
Alteración hidrotermal y mineralización en el área del cerro El Temblor, sierra de La Huerta, provincia de San Juan
Autor/es:
CASTRO DE MACHUCA, BRÍGIDA; SUMAY, CELINA; MEISSL, ESTELA; PONTORIERO, SANDRA; CONTE-GRAND, ALICIA
Lugar:
La Plata
Reunión:
Congreso; V Congreso de Mineralogía y Metalogenia (V MIN-MET); 2000
Institución organizadora:
INREMI (Universidad Nacional de La Plata)
Resumen:
The rhyolite dome of El Temblor, located in the southwestern flank of La Huerta range, Marayes Mining District, is a fracture controlled body intruded in the Upper Precambrian- Lower Palaeozoic crystalline basement. K-Ar age determinations allowed to establish an Upper Permian age for this igneous body. Two breccia facies, one composed mainly by basement and andesite angular fragments, and the other of autoclastic nature, are spatially related with the contact between the rhyolite and the host rocks. The igneous body has strong pervasive quartz-sericite alteration. It presents minor Au and Ag anomalies related to glassy quartz and limonite stockwork, and shows limonite staining in the oxidized cap outcrops. Gold is associated to altered pyrite that occurs disseminated as well as in the stockwork veinlets, both in the rhyolite and in the breccia facies. Minor quartz-sulphide veins with a radial pattern were recognized in the basement rocks.
