Did Patagonia collide with Gondwana in the Late Paleozoic? Some insights from a multidisciplinary study of magmatic units of the North Patagonian Massif (original) (raw)

Abstract

G e o l o g i c a A c t a , V o l . 8 , N º 4 , D e c e m b e r 2 0 1 0 , 3 4 9 -3 7 1 D O I : 1 0 . 1 3 4 4 / 1 0 5 . 0 0 0 0 0 1 5 7 7 A v a i l a b l e o n l i n e a t w w w. g e o l o g i c a -a c t a . c o m The origin of Patagonia and its relations with the South American crustal blocks to the north have been a matter of debate for decades. We report results from a multidisciplinary study centered on Paleozoic granitoids exposed in the northeastern corner of the North Patagonian Massif. Microstructural and magnetofabric studies reveal two suites of granitoids. Late Carboniferous (?) granitoids (Yaminué Complex, Tardugno Granodiorite, Cabeza de Vaca leucogranite) were emplaced and subsequently deformed in a major NNE-SSW compressive stress regime that also provoked top-to-the-SW thrust deformation in shallow crustal levels. Gravity and geobarometric studies show that the same major deformation event has been recorded at different crustal levels. The age and type of deformation ...

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