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



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Moreno Martín, Diana and Díez Fernández, Rubén and Vicente Muñoz, Gerardo de and Fernández Rodríguez, Carlos and Gómez Barreiro, Juan (2022) Orogenic reworking and reactivation in Central Iberia: A record of Variscan, Permian and Alpine tectonics. Tectonophysics, 843 (229601). ISSN 0040-1951, online ISSN: 1879-3266

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Official URL: 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.

Item Type:Article
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CRUE-CSIC (Acuerdos Transformativos 2022)

Uncontrolled Keywords:Extensional collapse, Tectonic inversion,Collisional orogen, Intraplate orogen, Iberian Massif
Subjects:Sciences > Geology > Geodynamics
ID Code:75351
Deposited On:03 Nov 2022 16:38
Last Modified:04 Nov 2022 11:02

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