Fábrica magnética de diques doleríticos del Plutón de Panticosa (Zona Axial, Pirineos)

Abstract

This work deals with the magnetic fabrics of the doleritic dykes intruded in the Panticosa pluton. The dykes are grouped in two main families: one with N-S direction and another one E-W, the most common. The measured magnetic susceptibility values range from 390 10-6SI to 1464 10-6SI, being representative of paramagnetic rocks with a minor ferromagnetic component. The recorded magnetic foliations and lineations show a strong structural homogeneity all over the sampling transects. The obliquity between the magnetic foliations and lineations, and the walls of the dykes, implies that the magma was intruded taken advantage of an extensional process, oblique to the strike of the dykes. This process could be related with the regional stress field invoked to explain the intrusion of the Panticosa pluton