Criterios del sentido de movimiento en espejos de fricción: clasificación y aplicación a los granitos cizallados de la Sierra de San Vicente (Sierra de Gredos)

Abstract

In this paper, we first classify the different shearing sense criteria on slickensided surfaces, obtaining thus a practical guide both for the field, and the laboratory. We then apply some of these criteria to the C shearing planes present in the San Vicente deformed granites. These planar structures in granites, which have not been used yet for the study of slickensided surfaces, seem ideal for verifying and/or proposing criteria, as their shearing senses are already known from previous studies (Doblas et al., 1983, Doblas 1985). Some of these features are investigated here under the scanning electron microscope. Apart from indicative of the shearing senses, these structures also reveal interesting characteristics of formation of the C planes.