Isotopic dating on the crystalline basement rocks of the Bariloche region, Río Negro, Argentina

Abstract

South of Bariloche, one of the remnants from the Crystalline Basement of the North-Patagonian Cordillera crops out. They appear on the eastern- Andean side as tectonic slices dipping West, in an environment abundant in granitoids and volcanics of a magmatic belt essentially developed during the Cretaceous and Tertiary. Doubts have arisen with regard to the age of the basement, and in general it has been assigned to the Precambrian. Earlier radiometric information, together with the present work, provides new data enabling more accurate chronostratigraphic position and geotectonic relevance.