Orogenic reworking and reactivation in Central Iberia: A record of Variscan, Permian and Alpine tectonics

Interference between orogenic systems and deformation phases within them may lead to reworking reactivation of previous structures. The eastern sector the Spanish-Portuguese Central System holds evidence two systems, Variscan Alpine, plus a stage Permian extension. We perform an integrated structural analysis identify processes throughout geological record. record starts with crustal thickening (D1; E-verging overturned folds). A second phase features intra-orogenic collapse overthickened crust (D2; top-to-the-SE ductile extensional shear zone), which produced intense at core zone moderate its hanging wall. During subsequent strike-slip tectonics, parted transpressional into dextral upright folds (D3). did not reactivate structures, but exploited weak rheological boundary defined by contrasted lithologies (sedimentary versus igneous rocks) accommodate D2 shearing. Reactivation played role afterwards: acted as transfer fault extension (post-orogenic collapse), then Alpine contraction. is blurred inversion, although trend structures in Iberia, System, result from inheritance.