Resumen de Caracterización del granito Fitz Roy Provincia de Santa Cruz, Argentina

Andrés Kosmal, Juan P. Spikermann

• The Miocene aged Fitz Roy granite is located at 73º 4' W and 49º 16' S in the province of Santa Cruz, Argentina. It is a 45 kmn2stock of ovoidal section, being its major axes of approximately 16 km EW and 9 km NS direction. Its character isepizonal, and zonal in its transversal sense facies. A marginal dark microdioritic facies and a main graniticgranodioriticfacies are clearly seen. The box is made up of leptomorphytes of the Paleozoic Formation Bahia de laLancha, vulcanogenic Jurassic rocks of the Complejo el Queinado and Cretaceous sedimentites of the Rio MayerFormation. Both facies are chalcoalkalines of medium to high potassic alkalinity. The dioritic facies is aluminainfrasaturated, whereas the granitic main facies presents meta and peraluminous saturation terms.