Acortamiento paralelo a las capas y dirección de transporte tectónico deducido a partir del análisis de la fábrica magnética (ASM) de rocas post-hercínicas del Pirineo Central, valle del río Aragón-Subordán, Pirineo Oscense

Abstract

A N-S section has been studied in post-hercynian rocks of a Central Pyrenees sector in order to search for a relationship between magnetic fabric (ASM) and the regional deformation pattern. The section, which is normal to the main ESE-WNW macrostructures, comprises materials from Upper Cretaceous to Eocene (nine sites, 253 samples). Two main types of stretching lineations have been interpreted from the ASM fabrics: The first one is defined by a magnetic lineation parallel to the major structures and interpreted by layer-parallel shortening. The second one is normal to the bedding-cleavage intersection lineation and thus coincides with the regional tectonic transport direction. Both magnetic lineations fit into the bedding surface and them are not related with the regional cleavage, suggesting its early acquisition