Evidence of a transform type margin during Paleogene from 38º S to 44º S Latitude in the Southern Andes

ARAGON, E.

Mendoza

Simposio; Backbone of the Americas, Patagonia to Alaska; 2006

Geological society of America, Asociación Geológica argentina

In contrast to its Cretaceous and Neogene location at the continental margin, magmatic activity in the Paleogene of Patagonia becomes unusually voluminous and widespread at the Comon Cura Massif. A large plateau of rhyolitic ignimbrite and alkaline basalts is developed at the southwestern margin of the massif in Paleocene-Eocene times along an old NW-SE transcurrent fault system in the Oligocene. This activity is manifested as a subalkaline andesite-rhyolite-alkaline basalt belt to the west and an alkaline basalt plateau to the east.