The basaltic volcanism of Pire Mahuida Complex, extraandean Patagonia,

SALANI, F. M.; REMESAL, M. B.; PARICA, C. A.; CERREDO, M. E.

Alemania

Otro; 21th Colloquim on Latein American Earth Sciences; 2009

The Pire Mahuida Complex (PMC), located in the extraandean region of the southern part of Argentina, is a bimodal volcanic field developed during Miocene times, likely related to an extensional regime. The PMC is made up mainly of acidic pyroclastic and lava facies, rhyolite/dacite (< trachyte) flows and lava domes. Subordinated in volume, basaltic flows overlie this extensive sequence of acidic rocks. The basic facies displays a wide span of compositional, morphological and structural features which allow distinguishing different groups. The effusion of basaltic rocks represents the final phase of the eruptive history of the PMC. The basalts can be grouped in two main effusive stages.