Estructura y evolución tectónica del dominio continental de la banda matamórfica de Aracena (Macizo Ibérico Meriodional)

Abstract

The analysis of hight-temperature/low-pressure metamorphic belts is of great interest since they are usually related to convergent continental margins that have undergone an anomalous heat flux in the deep crust. The present contribution deals with the structure and tectonic evolution of one of the most peculiar high-temperature/low-pressure metamorphic belts in the Iberian Massif: the Aracena metamorphic belt. Up to four ductile deformation phases have been characterised in the studied zone. D1 could be associated with kilometre-scale recumbent folds. D2 is responsible for the main foliation of the continental domain and is related to an extensional collapse event. D3 grave place to symmetric upright folds. Finally, D4 produced, on one hand, the Cortegana-Aguafría shear zone and other related minor shear zones, which generated thrusting to the SSW and very penetrative mylonitic fabrics and, on the other and, fault-related folds with a SSW vergence. The superposition of these antiforms with the D3 folds gave place to complex interference patterns, with changing morphologies depending upon the considered area.