The Late Paleozoic Navarrete Complex, NE North Patagonian Massif, Argentina: geology, chemical characterization and magnetic fabric study

LÓPEZ DE LUCHI, M. G.; RAPALINI, A.E.; TOMEZZOLI, R.

Stellenbosch, South Africa

Simposio; Sixth Hutton Symposium on the Origin of Granites and related rocks; 2007

Universidad de Stellenbosch, South Africa

The aim of our contribution is to present the first results on the internal structure new chemical information and a regional interpretation of the Navarrete Plutonic Complex (NPC, NE North Patagonian Massif) a composite batholith which intruded the upper crustal rocks of the Cambrian Nahuel Niyeu Fm (NNF) Highly deformed granitoids and orthogneisses of the Late Paleozoic Yaminue Complex (YC) appear at the western margin. As several areas are intruded by younger epizonal granites or covered by younger volcanic rocks the outcrop pattern of the batholith is difficult to depict. Where observed, contacts are NNE-SSW or N-S. trending. Plutons emplaced in NNF are NNE elongated and vary from 5- 20 km in length. Three main domains were depicted by field observations, petrography and the AMS study. Domains 1 and 2 are paramagnetic whereas domain 3 is ferromagnetic.