Capote Del Villar, RamónMartín González, FidelTsige Beyene, Meaza2024-07-312024-07-312000Capote del Villar, R., Martín González, F. y Tsige Beyene, M. (2000): «Tectónica extensional en el Sistema Central: La Zona de Cizalla Dúctil de Santa María de la Alameda (Madrid)», Geogaceta, 28, pp. 27-30.0213-683Xhttps://hdl.handle.net/20.500.14352/107291The Santa Maria de Alameda (Madrid) Ductile Shear Zone is a complex mylonitic belt trending east -West and dipping 30°-60° southward. The hanging wall block sinks towards the South-Southeast. Its kinematics is in relation to an extensional tectonic regime with North-south stretching direction. This large structure belongs to the early stages of the Malagon tectonic period, where important faulting and dike emplacement were produced. The shearing process was developed in retrograde metamorphic conditions in a wide range of temperature, which goes from 400° C to 150° C. The age of this deformation is constrained by the variscan regional metamorphic peak and the intrusion of late variscan granitoids (Las Navas del Marques adamellites), being therefore, between early Namurian and Stephanian.spajournal articlehttps://sociedadgeologica.org/publicaciones/geogaceta/geogaceta-28-1999/open access551.24(460.27)Variscan metamorphismDuctile shear zoneMylonitesExtensional tectonicsGeodinámicaGeología2507.07 Tectónica2506 Geología