Modelo gravimétrico tridimensional del “stock” de Aguablanca (Badajoz)

Abstract

The Aguablanca stock is located in the NE zone of the Santa Olalla Igneous Complex, in the Ossa-Morena Zone. Paleozoic rocks of the Bodonal-Cala Complex and Santa Olalla tonalites bound this gabbronorite stock. This rock hosts a Ni-Cu-EGP ore deposit. A gravity survey, Bouguer anomaly map production and 3D gravity modelling have been carried out in the area in order to investigate de Aguablanca stock geometry. The residual gravity map exhibits a gravity high related to the gabbronorite of Aguablanca, a denser rock than the surroundings, as well as to the semi-massive sulphides outcrops. As featured in the 3D density model, the Aguablanca stock has a tabular geometry subparallel to its northern limit, deeping to 1850 m. In its upper part the igneous body spreads and adopts a circular shape. The Aguablanca stock emplacement is related to a variscan ductile shear zone.