%0 Journal Article
%A González Fernández, Antonio
%A Córdoba Barba, Diego
%A Vegas Martínez, Ramón
%A Matías, Luis Manuel
%T Seismic crustal structure in the southwest of the Iberian Peninsulaand the Gulf of Cadiz
%D 1998
%@ 0040-1951
%U https://hdl.handle.net/20.500.14352/57606
%X The crust under the southwestern Iberian Peninsula and the Gulf of Cadiz has been sampled by 1200 km of deep seismicrefraction=wide-angle reflection profiles, together with many seismic reflection lines and bore-holes. Wide-angle seismicdata were collected during the last three decades. Commercial multichannel data provide a detailed image of the uppermostcrust, improving the confidence about the models of the deeper structures. P-wave velocities within the thick column ofsediments in the Gulf of Cadiz range from 2.0 to 3.8 km=s, while the Algarve and the Sines areas have higher velocitiesof 4.3 to 4.8 km=s. The top of the Palaeozoic basement rises to the northwest, outcropping in the South Portuguese zoneof the Iberian Massif, and is characterized by P-wave velocities of 5.7–5.9 km=s. High velocities of 6.4 km=s have beenfound at shallow depths of 7 to 10 km in the South Portuguese zone, that could be related to the mafic and ultramaficrocks in the Beja-Acebuches zone. Lower crustal velocities are in the range of 6.7–6.9 km=s. The crustal thickness showsimportant lateral changes from 29 km beneath the Guadalquivir Basin=Iberian Massif contact to 35 km in the southeasternpart of the South Portuguese zone. From the interpretation of these seismic data, a geodynamic model of the evolution ofthe crust in Southwestern Iberia and the Gulf of Cadiz is proposed. The Guadalquivir Basin, and its continuation at sea, theGulf of Cadiz, is a flexure area of the crust that could be related to the overloading due to the overthrusting of the AlboranDomain over the Iberian plate.
%~