%0 Journal Article
%A Martínez Poyatos, D.
%A Carbonell Beltrán, Ramón
%A Palomeras, Inmaculada
%A Simancas Cabrera, José Fernando
%A Ayarza Arribas, Puy
%A Martí, D.
%A Azor, Antonio
%A Jabaloy Sánchez, Antonio
%A González Cuadra, Pablo
%A Tejero López, Rosa
%A Martín Parra, L.M.
%A Matas, J.
%A González Lodeiro, F.
%A Pérez Estaún, A.
%A García Lobón, J.L.
%A Mansilla Plaza, Luis
%T Imaging the crustal structure of the Central Iberian Zone(Variscan Belt): The ALCUDIA deep seismicreflection transect
%D 2012
%@ 0278-7407
%U https://hdl.handle.net/20.500.14352/42401
%X ALCUDIA is a 230 km long, vertical incidence deep seismic reflection transectacquired in spring 2007 across the southern Central Iberian Zone (part of the pre-MesozoicGondwana paleocontinent) of the Variscan Orogen of Spain. The carefully designedacquisition parameters resulted in a 20 s TWTT deep, 60–90 fold, high-resolutionseismic reflection transect. The processed image shows a weakly reflective upper crust(the scarce reflectivity matching structures identified at surface), a thick, highly reflectiveand laminated lower crust, and a flat Moho located at 10 s TWTT (30 km depth).The transect can be divided into three segments with different structural styles in the lowercrust. In the central segment, the lower crust is imaged by regular, horizontal and parallelreflectors, whereas in the northern and southern segments it displays oblique reflectorsinterpreted as an important thrust (north) and tectonic wedging involving the mantle(south). The ALCUDIA seismic image shows that in an intracontinental orogenic crust,far from the suture zones, the upper and lower crust may react differently to shorteningin different sectors, which is taken as evidence for decoupling. The interpreted structures,as deduced from surface geology and the seismic image, show that deformation wasdistributed homogeneously in the upper crust, whereas it was concentrated in wedge/thruststructures at specific sectors in the lower crust. The seismic image also shows the locationof late Variscan faults in spatial association with the lower crustal thickened areas.
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