Espesor de sedimentos en las cuencas Cenozoicas del oeste de España a partir de datos magnéticos de alta resolución

Resumo

Sedimentary thickness of Cenozoic intramountain basins in the central western sector of the Iberian Peninsula is still under review due to the lack of seismic reflection and hydrocarbon exploratory wells, due to the absence of Mesozoic cover. Only groundwater wells have been drilled, however not many of them reach the basement. The aim of this work is to review sedi- mentary thickness in Ciudad Rodrigo, Cepeda, Amblés, Campo Arañuelo, Zarza de Granadilla, Torrejón-Talaván, Coria, Moraleja, Guadiana and Badajoz basins based on high resolution magnetic data (Getech, 2011). These basins are exceptio- nal examples for depth to magnetic basement estimations due to the high magnetic susceptibility contrast between Cenozoic sediments and basement. In addition, basins are not structurally extremely complex. Tilt-depth method (Salem et al., 2007) shows very consistent and homogeneous solutions, with maximum sedimentary thickness up to 2000 m in well-structured basins as Campo Arañuelo and Ciudad Rodrigo. Average thickness is 500-600 m. Main depocenters are associated to the footwall of the alpine thrusts. Those basins not limited by main alpine thrust has a moderate sedimentary record and do not have such well-defined depocenters.