Suscettività magnetica e assetto strutturale nelle Ande in Tierra del Fuego

Abstract

With the aim of studying the tectonic evolution of the Fueguian Andes,the magnetic susceptibility tensor was measured on sample rocks of the Lemaire and Yahgán Fms outcrop in the area between Paso Garibaldi and Canal Beagle in Tierra del Fuego. In the northern area the orientations of the K1 axis of the magnetic fabric shows a dominant directions N-S that can be correlated to the tectonic transport. In the south from Carbajal valley to Canal Beagle, the orientations are roughly E-W that are linked to the morphostructural lineations associated with a the strike-slip faults. The good correspondence between the magnetic anisotropy axis K3 and the rock foliation, permit to assign to a tectonic origin of the magnetic fabric.