Distribución de la deformación de los granitos sincinemáticos de Sanabria (Zona Centro-Ibérica)

Abstract

This work presents the distribution of the deformation in the synkynematic Ribadelago and Sotillo plutons, in the Sanabria region. These granitoids intruded in the Olio de Sapo antiform ot the Central-lberian Zone o f the Iberian Massif. These igneous bodies display a great litological variation, ranging from granite to dioritic rocks, and are organized like a dyke complex. The structures in the host rocks reflect two deformation phases. Associated with the second deformation phase, two dextra! dúctil shear zones appeared. The link between these en-échelon shear zones draws an extensional bridge. The Ribadelago and Sotillo plutons were synkinematicaly emplaced in the overlapping zone of the shear zones. There was a continuous interplay between deformation and intrusion of igneous sheets, represented by existence of older and folded dyke systems and younger dykes with igneous textures. Field structures and microstructural data from oriented thin sections reveal different stages in the deformational process with a dominant sol id-state deformation, which ranges from high to low temperature microstructures. Magmatic and submagmatic structures are only preserved in lensoid bodies bounded by corridors with higher deformation.