Tereso, V.Dias, R.Romão, JoséRoseiro, JoséCoke, CarlosFonseca, RitaRibeiro, A.2023-08-022023-08-022023-07Tereso, V.; Dias, R.; Romão, José; Roseiro, J.; Coke, Carlos; Fonseca, Rita; Ribeiro, A. (2023) - Transição Ordovícico-Silúrico na Zona Centro-Ibérica: apenas um contacto estratigráfico ou um elemento estruturante do Varisco Ibérico?. In: Lopes, F. C., Dinis, P. A., Duarte, L. V. e Cunha, P. P. (Coords.). XI Congresso Nacional de Geologia: Geociências e Desafios Globais. Livro de Resumos. Coimbra, 16- 20 julho de 2023, Departamento de Ciências da Terra da Universidade de Coimbra (eds.), p. 257-258. ISBN: 978-989-98914-8-7978-989-98914-8-7http://hdl.handle.net/10400.9/4100Resumo alargadoSUMMARY: Although the Ordovician-Silurian transition in the Central-Iberian Zone is usually considered a normal stratigraphic one, recent studies shows that often the black-shales of the Lower Silurian control the development of shear zones subparallel to the main layers. This behavior has been observed, not only in the Marão-Alvão region, but also in other sectors like, the synclines of S. Mamede, Mação and Buçaco. This seems to show that the Lower Silurian weak layers have been a major factor in controlling the evolution of the Iberian Variscides. Ongoing studies in the Celorico de Basto region will try to characterize and understand the evolution of these shear zones.porCentral-Iberian ZoneLower SilurianShear zonesIberian VariscidesZona Centro-IbéricaSilúrico InferiorZonas de cisalhamentoVarisco Ibéricoconference object