Mesozoic-Cenozoic evolution of the North Patagonian Batholith in Aysen, southern Chile

From: Journal of the Geological Society | Date: July 1, 1999| Author: | Copyright information

Abstract: A detailed Rb-Sr geochronological and geochemical study has been carried out on granitoids of the North Patagonian batholith in Aysen. The results for 25 plutonic bodies reveal a complex age pattern. The principal zones defined are, from west to east: Late Cretaceous (a single 76 Ma plu ton), Early Cretaceous (c. 135 Ma), Eocene (c. 45 Ma), and Early Miocene (25-15 Ma), reverting to mid-Cretaceous (120-90 Ma) in the Main Cordillera. The igneous suite is typically metaluminous and calc-alkaline, with hornblende-biotite granodiorite and tonalite dominant, although small bodies of Late ...

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