XII Congreso Geológico Chileno Santiago, 22-26 Noviembre, 2009 S8_026 Different plutonic events in extra-andine southern Patagonia, Chile Sanchez, A.1, Saint-Blanquat, M.2, Polvé, M.2, Hervé, F. 1 (1) Departamento de Geología, Universidad de Chile, Plaza Ercilla #803, Santiago, Chile. (2) LMTG/Observatoire Midi-Pyrénées, Université de Toulouse, 14 av. Edouard-Belin, 31400 Toulouse, France.
[email protected] Introduction In Ultima Esperanza province, southern Patagonia, there are three Cenozoic plutons out- croping in the extra-andine zone, considered by [1] as part of a major north-south linea- ment of plutons (Fig.1). They intrude Upper Cretaceous rocks of the Magallanes basin and they are located aprox. 60 Km east of the Southern Patagonian Batolith (SPB). From north to south they are: Torres del Paine, Cerro Donoso and Monte Balmaceda plutons (Fig.1). Due to their closeness (they dist each other less than 50 km) and their predomi- nant granitic litologies, they have been considered as generated in the same magmatic event during Miocene times (e.g. [1, 2]). The most studied pluton of this group is Torres del Paine [1, 2, 3, 4, 5, 6, 7], in which it is possible to distinguish 3 main units: The Paine granite (PG); the Paine Mafic Complex (PMC); and the external gabbro (EG). It is argued by [4] that the EGis not cogenetically linked with the PMC rocks – supported by older ages of the external gabbros [5]- but the PMC and the PG, are considered to be consanguineous [4]. Even in the Paine complex, not all the magmatic rocks are considered to be cogenetic, it is not clear if either the granitic or dioritic rocks from Cerro Donoso and Monte Balmaceda are genetically linked with those of Torres del Paine.