The Permian-Early Triassic Plutonic Complexes of the Northern Sector of the North Patagonian Massif

LÓPEZ DE LUCHI, M.G.,; RAPALINI, A.E.; MARTINEZ DOPICO, C.I.

Cordoba

Congreso; XIII Congreso de Mineralogía, Petrología Ígnea y Metamórfica, y Metalogénesis; 2019

Asociacion Geologica Argentina

Controversial hypothesis on the evolution of northern Patagonia and its relationship with Gondwana during Paleozoic to Early Mesozoic times were based on a compositionally diverse group of granitoid plutons and batholiths which are cropping out in extra-Andean Northern Patagonia. South of the state road 23 between Yaminué and Nahuel Niyeu towns (Fig. 1) NE North Patagonian Massif (NPM), granitoids were originally separated in two complexes the intensively deformed Precambrian Yaminue Complex and the Permian Navarrete Plutonic Complex (Lopez de Luchi et al. 2010 and references therein). More recently new geochronological data allowed to reassign the major part of the Yaminué Complex to the Late Permian-Early Triassic and the Navarrete Plutonic Complex to the Early Permian. Ans to propose them as evidence either for intraplate, arc, collisional or post-collisional magmatism (López de Luchi et al. 2010, Rapalini et al. 2010, Chernicoff et al. 2013, Pankhurst et al. 2014 and references therein. In this contribution we redefine the Permian ?Early Triassic granitoids cropping out south of Nahuel Niyeu and between Ramos Mexia and Yaminué towns based on chemical and isotopic characterization and published and new U-Pb Shrimp ages.