Crustal Imbrication in an Alpine Intraplate Mountain Range: A Wide?Angle Cross?Section Across the Spanish?Portuguese Central System

Intraplate ranges are topographic features that can occur far from plate boundaries, the expected position of orogens as described in tectonics theory. To understand lithospheric structure intraplate ranges, we focused on Spanish-Portuguese Central System (SPCS), most outstanding feature central Iberian Peninsula. The SPCS is an Alpine range exhumes Precambrian-Paleozoic rocks and located at >200 km northern border microplate. Here, provide a P-wave velocity model based wide-angle seismic reflection/refraction data (Gredos sector). Our results show: (a) layered lithosphere characterized by three major interfaces: Conrad, Mohorovicic, Hales discontinuities, (b) asymmetry crust-mantle boundary under SPCS, (c) extent Variscan batholith forming main outcrops Gredos, (d) thinning lower crust toward south. This suggests exhumation basement was driven south-vergent thick-skinned thrust system, developed southern part promoted crustal imbrication Mohorovicic discontinuity's offset SPCS. Thus, deformation mechanisms seem to be controlled presence late- post-Variscan granitoids assimilated mid-crustal detachment creating new rheological boundary. tectonic allowed formation crustal-scale systems eased coupled upper crust, leading limited underthrusting both layers.