Nuevos datos tectono-estructurales del Macizo de Brovales (Antiforma de Olivenza-Monesterio): relación con el cabalgamiento de Monesterio

Abstract

The Brovales Massif is a calckalcaline hercynian pluton intruded in Precambriam Serie Negra and clastic lower Cambrian sediment. Its emplacement has been suposed sinkinematic to the main hercinian fase. New structural and cartographic data reveals that this pluton has a central unit located in the norther area of the massif that shows a strong deformation with a generalised foliation N120°E-trending and dipping 30NE with a lineation N30°E, difining a generalised C-S structure. Cinematic criteria indicated top to the shouth thrusting. A second indeformed facies crop in the southern sectors and a thin level of metapelites and black quartzites to the Serie Negra Formation also afected by the same tectonic separate both facies. A hundreds meters thic shear zone with letf lateral movement deforms all granitic fades. The main thrust is considered to be the west prolongation to the Monesterio Thrust that shows similar kinematic. The Brovales Massif has been emplaced in more than one event and a more detailed cartographic work is needed