1 Vila Velha de Ródão Variscan complex syncline: stratigraphy and structure (Central-Iberian Zone, Portugal)

The complex syncline of Vila Velha de Ródão is located in the Central-Iberian Zone (CIZ), SW sector. The studied lithostratigraphic succession is situated above the unconformity that separates the Beiras Group (BG) shale and greywacke complex from the Armorican Quartzitic Fm (AQF). This presentation shows the geological relationship between the Ordovician-Silurian lithostratigraphic succession and the Variscan stucture, which is based on new data that the review of geological mapping on the 1/25000 scale allowed to establish. The revision of Vila Velha de Ródão geologic mapping emphasizes the presence of a lithostratigraphic succession with Lower to Middle Paleozoic age, already recognized in the Amêndoa-Carvoeiro synform (Romão, 2000; 2001; 2006).The stratigraphic series is represented from the basis to the top, by: Beiras Group, BG (Ediacaran to Cambrian)- the shale and greywacke complex contacting with Lower Paleozoic through angular unconformity and faulting surface. Ordovician-Silurian succession- Armorican Quartzitic Fm, AQF (80m)- massive coarse-grained arenites with conglomerates and fine laminated quartzites with Skolithus and Cruziana; Brejo Fundeiro Fm, BFF (120m)- pelites and siltstones with Didymograptus and trilobites (Ribeiro et al., 1965; 1967; Teixeira, 1981); Monte de Sombadeira Fm, MSF (15m)