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- W1999336568 abstract "Middle/late Devonian and early Carboniferous metasedimentary sequences in the northernmost region (Porto-Espinho-Tomar) of the Ossa-Morena Zone (Portuguese Iberian Variscan Massif) contain black shales of very low to low-grade metamorphism. These metasedimentary rocks form a discrete NNW-SSE structure within a major shear zone (Porto-Tomar-Ferreira do Alentejo) and remain subparallel to the observed regional major structures (folding, thrusts or overthrusts). These black shales are overhanged and then imbricated in an upper Proterozoic metamorphic substratum. A multi-disciplinary study of these metasedimentary rocks from the Espinho-Tomar region has tectonostratigraphy, palynology, organic petrology and clay mineralogy combined methods. This approach provides new insights into the tectonic evolution and geological framework of Palaeozoic basement of the Iberian Variscides. Palaeoenvironmental and tectonostratigraphic implications on the Iberian geodynamic framework are discussed. À l’extrême Nord (Porto-Espinho-Tomar) de la Zone d’Ossa-Morena (Massif Ibérique des Variscides au Portugal), des successions d’âge Dévonien moyen/supérieur et Carbonifère inférieur renferment des shales noirs à métamorphisme de faible à très faible degré. Ces métasédiments forment un panneau structural NNO-SSE à l’intérieur de l’importante bande de cisaillement de Porto-Tomar-Ferreira do Alentejo, tout en demeurant sub-parallèles aux structures majeures régionales (plis, chevauchements, charriages). Ces shales noirs sont aujourd’hui imbriqués dans un substratum métamorphique d’âge Protérozoïque supérieur. L’étude multidisciplinaire (tectonostratigraphie, palynologie, pétrologie organique, minéralogie des argiles, et pétrographie métamorphique) ouvre de nouvelles perspectives sur le cadre géologique et l’évolution tectonique du socle paléozoïque des Variscides Ibériques." @default.
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- W1999336568 date "2003-11-01" @default.
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- W1999336568 title "Tectonostratigraphy of Middle and Upper Palaeozoic black shales from the Porto-Tomar-Ferreira do Alentejo shear zone (W Portugal): new perspectives on the Iberian Massif" @default.
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- W1999336568 doi "https://doi.org/10.1016/j.geobios.2003.03.002" @default.
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