2026-06-30T03:14:25Zhttps://docta.ucm.es/rest/oai/request
oai:docta.ucm.es:20.500.14352/725662024-08-02T13:18:41Zcom_20.500.14352_14col_20.500.14352_15
Docta Complutense author Moreno Martín, Diana author Vicente Muñoz, Gerardo De author Díez Fernández, Rubén author Fernández Rodríguez, Carlos author Gómez Barreiro, Juan 2023-06-22T12:27:50Z 2023-06-22T12:27:50Z 2022-11-20 0040-1951, online ISSN: 1879-3266 10.1016/j.tecto.2022.229601 https://hdl.handle.net/20.500.14352/72566 https://doi.org/10.1016/j.tecto.2022.229601 Interference between orogenic systems and deformation phases within them may lead to reworking and reactivation of previous structures. The eastern sector of the Spanish-Portuguese Central System holds evidence of two orogenic systems, Variscan and Alpine, plus a stage of Permian extension. We perform an integrated structural analysis to identify reworking and reactivation processes throughout the geological record. The Variscan record starts with crustal thickening (D1; E-verging overturned folds). A second phase features the intra-orogenic collapse of an overthickened crust (D2; top-to-the-SE ductile extensional shear zone), which produced intense structural reworking at the core of the shear zone and moderate reworking at its hanging wall. During subsequent strike-slip tectonics, crustal thickening parted transpressional deformation into a dextral shear zone and upright folds (D3). Variscan deformation did not reactivate previous structures, but exploited a weak rheological boundary defined by contrasted lithologies (sedimentary versus igneous rocks) to accommodate D2 shearing. Reactivation played a role afterwards: Variscan strike-slip shear zone acted as a transfer fault to accommodate Permian extension (post-orogenic collapse), and then Alpine contraction. The Permian extension record is blurred by Alpine inversion, although the trend of Alpine structures in Central Iberia, and the Spanish-Portuguese Central System, may result from Permian structural inheritance. eng Atribución-NoComercial-SinDerivadas 3.0 España Orogenic reworking and reactivation in Central Iberia: A record of Variscan, Permian and Alpine tectonics journal article URL https://docta.ucm.es/bitstreams/9c5271c4-9d64-4f80-9b95-181438372d67/download File MD5 5c82ad4631a72eb0493233ffd39a946f 34950537 application/pdf Orogenic reworking and reactivation in Central Iberia.pdf URL https://docta.ucm.es/bitstreams/3aeb2424-0a98-496a-802b-6847f8c801f5/download File MD5 cd60dfc6fc4feb2613639ac3c36ad6c1 133011 text/plain Orogenic reworking and reactivation in Central Iberia.pdf.txt