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  • Transição Ordovícico-Silúrico na Zona Centro-Ibérica: apenas um contacto estratigráfico ou um elemento estruturante do Varisco Ibérico?
    Publication . Tereso, V.; Dias, R.; Romão, José; Roseiro, José; Coke, Carlos; Fonseca, Rita; Ribeiro, A.
    SUMMARY: 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.