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Extensional tectonics in the Central System: The Santa Maria de la Alameda Ductile Shear Zone (madrid)
- Source :
- Arias Montano. Repositorio Institucional de la Universidad de Huelva, instname
- Publication Year :
- 1999
- Publisher :
- Sociedad Geológica de España, 1999.
-
Abstract
- 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
- Subjects :
- Variscan metamorphism
Ductile shear zone
Extensional tectonics
Mylonites
Subjects
Details
- Language :
- Spanish; Castilian
- Database :
- OpenAIRE
- Journal :
- Arias Montano. Repositorio Institucional de la Universidad de Huelva, instname
- Accession number :
- edsair.RECOLECTA.....4381f854c6245b6ac6d152379ecb1920