Late Oligocene?Early Miocene submarine volcanism and deep marine sedimentation in an extensional basin of southern Chile. Implications for the tectonic development of the North Patagonian Andes.

ENCINAS ALFONSO; FOLGUERA ANDRES; OLIVEROS VERONICA

GSA Bulletin

GSA

Año: 2015

1943-2674

The ChiThe Chilean margin has been used as the model of an ocean-continent convergent system dominated by compression and activemountain building as a consequence of the strong mechanical coupling between the upper and the lower plates. The Andean Cordillera, however, shows evidence of alternating phases of compressional and extensional deformation. Volcano-sedimentary marine strata in the Aysén region of southern Chile contribute to an understanding of the causesof extensional tectonics and crustal thinning that occurred in the Andean orogeny becausethese deposits constitute the only reliable record of submarine suprasubductionvolcanism during the Cenozoic in southern South America.