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vol.37 número1Estratigrafía y paleontología del Cenozoico marino del Gran Bajo y Salinas del Gualicho, Argentina, y descripción de 17 especies nuevas índice de autoresíndice de materiabúsqueda de artículos
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Andean geology

versión On-line ISSN 0718-7106

Resumen

RADIC, Juan Pablo. Cenozoic basins and their control on volcanism of Nevados de Chillan and Copahue-Callaqui complexes (36-39°S, Southern Andes. AndGeo [online]. 2010, vol.37, n.1, pp.220-246. ISSN 0718-7106.  http://dx.doi.org/10.4067/S0718-71062010000100009.

The Cordillera Principal at 36° to 39°S is an excellent place to address the relationship between tectonics and volcanism. Based on tectonostratigraphic analysis of the Cenozoic basins it has been possible to recognize a clear spatial coincidence between first order basin scale structures and Plio-Pleistocene volcanism. Cenozoic basins started in the Oligocene-Miocene as extensional depocenters, characterized by at least three north-south oriented sub-basins connected by two structural accommodation zones. Towards the Late Miocene this extensional system was tectonically inverted deforming and uplifting the previous extensional faults and sedimentary fill. The accommodation zones prevailed as first order structures and acted as weakened zones that enabled the volcanism and magmatism at the Nevados de Chillan and Copahue-Callaqui volcanic complexes. Each one of these volcanic complexes is characterized by an oriented series of emission centers, volcanic morphology and deposits that are subparallel to the underlying accommodation zone.

Palabras clave : Andes; Chile; Cura-Mallín basin; Rift; Inversion; Volcanism; Tectonics.

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