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Structure of the Ugíjar Basin using gravity and magnetic data (Internal Zones, Central Betic Cordillera)

Abstract

Nuevas medidas gravimétricas y magnéticas adquiridas en la Cuenca de Ugíjar contribuyen a determinar el espesor de su relleno sedimentario y las estructuras que deforman las rocas sedimentarias y el basamento. La combinación de los resultados gravimétricos con datos geológicos de superficie confirma la asimetría de la cuenca, condicionada por el funcionamiento, en su borde sur, de fallas ENE-OSO y componente dextrorsa-normal. En el borde norte, el techo del basamento profundiza con pendiente regional constante hacia el sur aunque hay estructuras tectónicas que deforman el relleno sedimentario. La existencia de dipolos magnéticos de pequeña entidad en el sector N está probablemente relacionada con mineralizaciones metálicas discontínuas asociadas al contacto Alpujárride/Nevado-FilábrideNew gravity and magnetic data reveal the geometry and thickness of the Ugíjar basin infill and provide additional information about the tectonic structures that deform both the basin and the basement rocks. As previous geological data suggested, the basin is asymmetric and highly conditioned by the activity of ENE-WSW trending faults with right-lateral/normal kinematics that are located in the southern border of the basin. At the northern boundary, the basement top dips smoothly southwards, although there are minor tectonic structures that deform up to the sedimentary infill. Magnetic dipoles have been detected in the northern part of the studied sector, probably associated with small and disperse metallic mineralizations deposited along the Alpujárride/Nevado-Filábride contac

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