Relaciones estratigráficas y edad relativa del volcanismo basáltico en la cuenca de Marayes- El Carrizal, provincia de San Juan, Argentina

CASTRO DE MACHUCA, BRÍGIDA; BRUNO, NATALIA; SUMAY, CELINA; PONTORIERO, SANDRA; MEISSL, ESTELA

Puerto Varas

Congreso; IX Congreso Geológico Chileno; 2000

Sociedad Geológica de Chile

This paper deals with the study of a basaltic rock (Marayes Viejo Basalt) outcropping at the triassic Marayes-El Carrizal basin, province of San Juan, Argentina. Petrographic and field relationships allow defining the volcanic nature of the eruptive rock exposure. The concerned lava flowed over the precambrian-paleozoic crystalline basement, and was covered by the triassic sedimentary rocks. The new evidences point out to an Early Permian age for the basalt, classified as trachybasalt according to its chemistry.