Evolution of the Rheic Ocean

https://doc.rero.ch/record/10847/files/raumer_bro.pdf

The birth of the Rheic Ocean — Early Palaeozoic subsidence patterns and subsequent tectonic plate scenarios

https://eprints.ucm.es/17386/1/1000358-_04.pdf

Diachronous Variscan tectonothermal activity in the NW Iberian Massif: Evidence from 40Ar/39Ar dating of regional fabrics

Kinematic constraints on buckling a lithospheric-scale orocline along the northern margin of Gondwana: A geologic synthesis

Role of the Ollo de Sapo massive felsic volcanism of NW Iberia in the Early Ordovician dynamics of northern Gondwana

The limit between the West Asturian-Leonese and Central-Iberian Zones in the NW of the Iberian Peninsula is described in the area of Caurel-Truchas (Provinces of Orense and Leon). From the distribution of the sedimentary formations and the Variscan structures it is inferred that the transition between the two zones was a fault system, which was active during, at least, the Ordovician and Lower Silurian. The faults were supposedly normal, though they had probably some strike-slip component, and gave rise to a half-graben in which a syn-rift sequence was deposited. The latter underwent inversion at the onset of the Variscan tectonism, producing a ramp anticline-syncline pair that forms the more important folds in the area. The varying geometry of these folds is interpreted partly as being due to the existence of previous en echelon folds related to the strike-slip component of the faults and, partly, as a result of the variable intensity of the shear strain undergone during the first variscan phase.

P. Villar Alonso

Papers

Lower Paleozoic extensional tectonics in the limit between the West Asturian-Leonese and Central Iberian Zones of the Variscan Fold-Belt in NW Spain