Thick-skinned inter-plate and intra-plate tectonics in NW and SW Iberia

António Ribeiro, José Manuel Correia Romão, Susana Henriques, Gregory Dunning, Maria Luisa Duarte Ribeiro, Ana Margarida Ribeiro Neiva, José Manuel Urbano Munhá, Eurico Pereira, Paulo Castro

Abstract


In the Abrantes area of the Ossa Morena Zone the NW tip of the Tomar-Badajoz-Cordoba Shear Zone (TBCSZ) stops against the Porto-Tomar-Ferreira do Alentejo Shear Zone (PTFASZ). Basement nappes of Cadomian age were thrust to the NE during the Variscan orogeny. Low intermediate pressure granulites contrast with high pressure eclogite Cadomian assemblages in the axial zone of TBCZ where we infer the presence of a Cadomian suture. It is proposed that the intra-plate basement nappe system of OMZ is connected via the PTFA paleotransform to the basement nappes of the NW Iberia inter-plate transported suture system.


Keywords


Variscides, Iberia, Basement nappes, Cadomian.

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