VOLCANIC CENTRES IN THE ALTA SIERRA OF SOMÚN CURÁ AND SURROUNDINGS,

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

Heidelberg

Otro; 22 Th Latinoamerican Colloquium; 2011

The Oligocene Somún Curá basaltic plateau covers a large area in the north of the Extra-Andean Argentine Patagonia. The mostly Miocene post-plateau volcanic associations are distributedover the plateau either as bimodal volcanic complexes (Salani et al., 2008) or as monogeneticbasaltic centres. Alta Sierra of Somún Curá (ASVC) is the youngest bimodal volcanic complex;it shows a typical alkaline basalt-trachyte association of intraplate geochemistry. Although majorand trace elements display fairly linear trends, the conspicuous disequilibrium textures as well assome chemical features may suggest that other petrogenetic processes beside fractional crystallizationcontrolled the evolution of the series.