Extensión mesozoica y acortamiento alpino en el borde occidental de la Cuenca Vasco Cantábrica

Abstract

Geological cross-section through the western border of the Vasco-Cantabrian Basin show the existence ofthe extensional faults active during Permo-Mesozoic sedimentation, as well as the tectonic inversion of these faults and generation of open folds during Alpine deformation. The hercynian basement of the Cantabrian Zone was deformed together with the Meso-Cenozoic cover during the extension and subsecuent compression without the existence ofdetachments betwen then. Cross-sections restaurations allow to reconstruct the sedimentary basins from Permian toUpper Cretaceus times. The calculated extension during this time and this section (75 Km long) is of about 6 Km and the alpine shortening of 20 Km.