Vulcanismo mesozoico del margen sudibérico a partir del análisis de anomalías magnéticas

Laburpena

The main magnetic anomalies in the south eastern Iberian Peninsula are related to both Alpine and Variscan geological structures. The aeromagnetic anomaly map of the Iberian Peninsula shows two orientation patterns for the magnetic dipo- les. The Variscan anomalies elongate in NW-SE direction whereas the Subbetic Cordillera dipoles overlap the former with NE-SW trend. New field magnetic surveys carried on to determine the position and geometry of intermediate igneous intru- sive bodies responsible for the magnetic anomalies in the Subbetic. Simultaneous modelling of aeromagnetic and field mag- netic anomalies together with the integration of magnetic susceptibility measurements and geological data allow defining the basic Subbetic bodies as well as quantifying the influence of the Variscan basement anomalies. The Subbetic anomalies are consequence of lenticular and discontinuous Jurassic basic volcanic bodies aligned in N70ºE direction. They emplaced in the initial stages of the continental crust fracturing, during the opening of the Tethys. This study stands out the remaining of the volcanic structure alignment despite the later alpine deformation. There is no any magnetic evidence of a major fracture in the underlying Iberian Massif basement. Therefore, the present-day orientation may be consequence of the detached Subbetic units’ rotation during alpine margin convergence.