Rosell Novel, OriolMartí i Castells, AnnaMarcuello Pascual, AlejandroLedo Fernández, JuanjoQueralt i Capdevila, PilarRoca i Abella, EduardCampanyà, Joan2022-02-242022-02-242011-060954-4879https://hdl.handle.net/2445/183443Uncertainties about the lithospheric structure of the Gibraltar Arc have led to the proposal of several contradictory models to explain its geodynamic setting. Herein, we present a novel 3-D model of the lithospheric electrical resistivity distribution beneath the whole Betic Cordillera obtained by inverting both broad-band and long-period magnetotelluric data. The lithosphere-asthenosphere boundary under SW Iberia is shown to be deeper than under the Alboran Basin. In addition, the sensitivity tests confirm the presence of a N-S oriented low-resistivity anomaly at lithospheric mantle depths east of the 4°W meridian. It coincides with an area of low velocities without earthquake hypocenters and is interpreted as asthenospheric material intruded by the lateral lithospheric tearing and breaking-off of the E-directed subducting Ligurian slab under the Alboran Domain. This scenario suggests that the opening of the Alboran Basin is related to the westward rollback of this E-directed subducting slab.23 p.application/pdfeng(c) John Wiley & Sons, 2011Geologia estructuralProspecció magnetotel·lúricaProspecció geofísicaGeomagnetismeStructural geologyMagnetotelluric prospectingGeophysical explorationGeomagnetisminfo:eu-repo/semantics/article5869712022-02-24info:eu-repo/semantics/openAccess