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La fábrica de las rocas miloníticas de la Zona de Cizalla de Los Llanos (Calzadilla de los Barros, Badajoz)

Jiménez Díaz, Alberto and Capote del Villar, Ramón and Tejero López, Rosa María and Lunar, R. and Ortega Menor, Lorena and Monterrubio Pérez, Serafín and Maldonado, Casimiro and Rodríguez, David (2009) La fábrica de las rocas miloníticas de la Zona de Cizalla de Los Llanos (Calzadilla de los Barros, Badajoz). Geogaceta (46). pp. 27-30. ISSN 0213-683X

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Abstract

The Los Llanos Shear Zone bounds the Cabeza Gorda and Zafra units located in the Ossa-Morena Zone (SW Iberian Massif). Within the Cabeza Gorda unit two peridotitic massifs crop out, named Sierra Cabeza Gorda and Cerro Cabrera. The mylonitic rocks consist of metamorphic and peridotitic rocks
extensively deformed that exhibit a penetrative foliation. Mylonitic fabrics are characterized by s and d structures and S-C and S-C’ band. Some examples show a crenulation cleavage that points out the existence of at least two deformation stages. Kinematic criteria are widespread, but dextral-reverse movement prevails both in outcrop and thin section. Los Llanos Shear Zone orientation is NW-SE, similar to variscan structures trend in the area, and deforms precambrian and paleozoic rocks. Los Llanos Shear Zone represents a dextral-reverse structure of Variscan age.

Item Type:Article
Uncontrolled Keywords:Mylonites, Peridotitic massifs, Shear zone, Calzadilla de los Barros
Subjects:Sciences > Geology > Geodynamics
ID Code:10958
Deposited On:08 Jul 2010 08:05
Last Modified:06 Feb 2014 08:53

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