Análisis de la fracturación asociada a las alteraciones hidrotermales de tipo Greisen y Episienita en la Sierra del Guadarrama.

Several episodes of hydrothermal activity have recently been dated in the Sierra del Guadarrama (Caballero et ai, 1992a). Stress analysis based upon the fault sets associated with 300-290 M.a. (Wlodes and greisens) and 274±6M.a. (episyenites) events, have been carried out. The first peak is related to a transtensional strike-slip tectonic regime, with S E-NW compression. The second is a ssociated to an extensional regime, with NE-SW and E-Wextension