Estudio de la fábrica magnética (ASM) y modelo de emplazamiento del macizo granítico de Trives (Galicia)

Abstract

The Trives granodiorite (NW Spain) is located within the metasediments of the «Olio de Sapo» antiform (northern part of the Iberian Variscan belt). The zonation of bulk low-field susceptibility indicates a more basic composition at the southern part of the central sector. Mapping of magnetic foliations and lineations of the Trives Massif indicate that the emplacement of the granodiorite was contemporary with NE-SW flattening. The orientation of foliation follows a NW-SE folded pattern (the poles of foliation planes are distributed along a great circle), plunging toward the NW. Magnetic fabric within the granitoid body and structures within the country rock allow to interpret this intrusion as a D3 synkinematic laccolith