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Title: Geodynamic evolution of the SW Europe Variscides
Authors: Ribeiro, António
Munhá, José
Dias, Rui
Mateus, António
Pereira, Eurico
Ribeiro, Luísa
Fonseca, Paulo
Araújo, António Alexandre
Oliveira, Tomás
Romão, José
Chaminé, Helder
Coke, Carlos
Pedro, Jorge
Keywords: Rheic
Issue Date: 14-Dec-2007
Publisher: American Geophysical Union
Abstract: Abstract The early evolution of SW Europe Variscides started by opening of the Rheic ocean at 500 Ma, splitting Avalonia from Armorica/Iberia. Subduction on the SE side of Rheic generated the Paleotethys back-arc basin (430–390 Ma, splitting Armorica from Iberia), with development of Porto-Tomar-Ferreira do Alentejo (PTFA) dextral transform defining the boundary between continental Armorica and Finisterra microplate to the W. Obduction of Paleotethys was followed by Armorica/Iberia collision and emplacement of NW Iberian Allochthonous Units at 390–370 Ma, whereas toward the west of PTFA, there was antithetic ophiolite obduction (Beja-Acebuches and Rheic ophiolites plus Finisterra continental slices) on top of Ossa-Morena Zone, with simultaneous development of eclogites and orogenic magmatism under a flake–double wedge tectonic regime. Continued convergence (<370 Ma) proceeded by intracontinental deformation, with progressive tightening of the Ibero-Armorican Arc through dextral transpression on the Cantabrian Indentor, from Iberia to Armorica. The proposed model is discussed at the light of the driving mechanism of ‘‘soft plate tectonics.’’
Type: article
Appears in Collections:CGE - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica
GEO - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica

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