Stratigraphy of Sierra de Chauchaiñeu, Patagonia, Argentina

SALANI, FLAVIA M.; REMESAL, M. B.

Linguaglossa-Vulcano-Lipari-Stromboli

Workshop; 3rd International Workshop, Etna-Aeolian Islands; 2016

IAVCEI Commission on Volcano Geology

The Barril Niyeu Volcanic Complex, crops out at Sierra de Chauchaiñeu, and comprises a basaltic-trachyte lithological association of both effusive and explosive activity (lava flows, lava domes, ash fall, pyroclastic flows, breccias and clastogenic lavas). Prior to fieldwork, an interpretation of the area was made from satellite images in order to identify the main volcanic units and in particular the eruptive vents.Mapping was performed on the bases of transects in addition to local surveys, and in some cases geochronological determinations assistance was essential to the definition of units. According to the observed distribution and volcanic stratigraphy, six volcanic units could be recognized. We present a geological map of Sierra de Chauchauñeu and the description of the different volcanic units.