RT Journal Article T1 Tectónica extensional en el Sistema Central: la Zona de Cizalla Dúctil de Santa María de la Alameda (Madrid) A1 Capote Del Villar, Ramón A1 Martín González, Fidel A1 Tsige Beyene, Meaza AB The 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. PB Sociedad Geológica de España SN 0213-683X YR 2000 FD 2000 LK https://hdl.handle.net/20.500.14352/107291 UL https://hdl.handle.net/20.500.14352/107291 LA spa NO Capote 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. DS Docta Complutense RD 14 dic 2025