Fig. 2

a Subdivision of the Iberian Meseta by Lotze (1945b) modified by Querol Muller (1989) by adding the heavy dashed line. The original text box in Spanish reads “Connection between the Palaeozoic chains to the north and south of the Galician-Castilian zone under the Tagus basin”. Coordinates and scale have been added. b Map of the Variscan basement in the Iberian Peninsula and the subdivision in zones of the Iberian Massif, based on Julivert et al. (1972) and Farias et al. (1987). The axial traces of the first Variscan folds and the main strike-slip shear zones are also shown, as well as the assumed continuations of the CZ, WALZ, and CIZ under the Mesozoic and Cenozoic cover. Arcs: CIA Central Iberian, IAA Ibero-Armorican. c Map of the magnetic anomalies in the Iberian Peninsula. Data from Ardizone et al. (1989) and Miranda et al. (1989)