Jorge Pedro

University of Évora

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Alexandre Araújo

University of Évora

Paulo E. Fonseca

University of Lisbon

A. Ribeiro

Universidade Federal do Rio de Janeiro

J. Munhá

University of Lisbon

Noel Moreira

University of Évora

Patrícia Moita

University of Évora

J. F. Santos

University of Aveiro

António Mateus

University of Lisbon

José Romão

Universidade do Porto

R. Dias

University of Évora

Cooperative Institutions

University of Lisbon

University of Évora

National Laboratory of Energy and Geology

Instituto Dom Luiz

National Institute of Engineering, Technology and Innovation

University of Aveiro

Universidade do Porto

University of Coimbra

Centre National de la Recherche Scientifique

Instituto de Geociencias

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Armazém de dados espacial aplicado à geoarqueologia

Pedro Nogueira Jaime Máximo Patrícia Moita Rui A.R. Boaventura Jorge Pedro

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Tectonoestratigrafia do Terreno Ibérico no sector Tomar- Sardoal-Ferreira do Zêzere e relações com o Terreno Finisterra

Manuel Romão Noel Moreira Rui Dias Jorge Pedro António Mateus

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The Porto-Tomar-Ferreira do Alentejo Shear Zone tectonostratigraphy in Tomar-Abrantes sector (Portugal)

Geotemas ( Madrid ) (2016)

Noel Moreira J. Romáo Jorge Pedro Ramiro M. Dias Flávia R. Oliveira

espanolLa Zona de Cizalla Porto-Tomar-Ferreira do Alentejoes una estructura de primer orden del orogeno Varisco Europeo. Sin embargo, su significado, origen y extension temporal son una tematica en discusion. Nuevos datos en el sector de Abrantes-Tomar muestra la presencia de unidades elongadas N-S, con caracteristicas tectono-estratigraficas propias y diferentes de las descritas para las Zonas Centro Iberica y Ossa-Morena. En este articulo se describe una sucesion de unidades metamorficas de grado medio y alto, atribuidas al Neoproterozoico, formada por ortoneises, paraneises, micaesquistos y metagrauvacas claramente relacionados con la zona de cizalla Porto-Tomar-Ferreira do Alentejo. Esta sucesion esta intruida por granitos Variscos. Durante el Carbonifero,se produjo un metamorfismo de alto grado en relacion con la deformacion de esta zona de cizalla con desplazamiento en direccion dextro, aunque la estructura estuvo activa desde las primeras etapas de la orogenia Varisca. EnglishThe Porto-Tomar-Ferreira do Alentejo Shear Zone is a first order structure on European Variscan Orogen. However, its significance, origin and time activity is a thematic in discussion. New data in the Abrantes-Tomar sector show the presence of N-S elongated units, with own tectonostratigraphic features and which differ from Central Iberian and Ossa-Morena Zones units so far known. In this paper, it was described a high to medium grade metamorphic succession, attributed to Neoproterozoic, with orthogneisses, paragneisses, micaschists and metagreywackes, clearly associated with the Porto-Tomar-Ferreira do Alentejo Shear Zone. This succession is intruded by granites during the Variscan Cycle. This shear zone is responsible for the high grade metamorphism associated with a dextral strike-slip deformation episode during Carboniferous times, although the structure is active, at least, since the early stages of the Variscan orogeny.

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Lithogeochemistry of metabasites from the Moura Phyllonitic Complex (Ossa Morena Zone, SW Portugal)

EGU General Assembly Conference Abstracts (2019)

José Roseiro Noel Moreira Rita Fonseca Alexandre Araújo Miguel Maia

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SW Iberia Variscan Suture Zone: Oceanic Affinity Units

Regional geology reviews (2019)

C. Quesada James A. Braid Paulo Fernandes Pedro Ferreira R. C. G. S. Jorge

Devonian

Passive margin

Continental Margin

10.1007/978-3-030-10519-8_5

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87Sr/86Sr ratios discrimination applied to the main Paleozoic carbonate sedimentation in Ossa-Morena Zone

Geotemas ( Madrid ) (2016)

Noel Moreira Jorge Pedro J. F. Santos Alexandre Araújo José Romão

espanolThe carbonate sedimentation in Ossa-Morena Zone during the Palaeozoic is formed, at least, during two main episodes. However, some chronological questions remain open, due to lack of biostratigraphic data in some carbonates. Sr isotope analysis were performed on selected limestones and marbles from Ossa-Morena Zone, in order to discriminate the Sr signature of the two main carbonate sedimentation episodes. The Sr isotopic data from the analyzed carbonates show two clusters of 87Sr/86Sr ratios, one related to the Lower Cambrian and other to the Lower-Middle Devonian carbonates. EnglishLa sedimentacion carbonatada en la Zona de Ossa-Morena durante el Palaeozoic esta formado, por al menos, dos episodios principales. Sin embargo, algunas cuestiones cronologicas permanecen abiertas, debido a la falta de datos bio-estratigraficos en algunos carbonatos. Se han realizado analisis de isotopos de Sr en calizas y marmoles seleccionados de la Zona de Ossa-Morena, con el fin de discriminar la signatura de Sr de los dos episodios principales de sedimentacion de carbonatos. Los datos isotopicos de Sr de los carbonatos analizados muestran dos grupos de relaciones 87Sr / 86Sr, uno relacionado con el Cambrico Inferior y otro con los carbonatos del Devonico Inferior-Medio.

Devonian

Late Devonian extinction

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The Moura Phyllonitic Complex: An Accretionary Complex related with obduction in the Southern Iberia Variscan Suture

Geodinamica Acta (2005)

Alexandre Araújo Paulo E. Fonseca J. Munhá Patrícia Moita Jorge Pedro

Abstract The structure of the southernmost domain of the Ossa Morena Zone in Portugal (south sector of the Iberian Autochthonous Terrane) is strongly controlled by earlier deformation events. The first two deformation events correspond to tangential strain regimes, marked by subhorizontal milonitic foliations. These events seem to be directly related with the obduction/subduction process during the Variscan ocean closure and the emplacement of the Beja-Acebuches Oceanic Terrane. In this domain (Évora-Beja Domain), the upper tectono-stratigraphic unit (Moura Phyllonitic Complex) is mainly represented by phyllites and corresponds to a strongly imbricated complex, involving several layers of autochthonous sequence (mainly rocks of a volcano-sedimentary complex), but it also includes dismembered and scattered slices of ophiolites. The widespread greenschists facies overprint an earlier high-pressure metamorphic event (blueschists in the central sector of Évora-Beja Domain and eclogites in the western sector). With regard to its geochemical signature, the Moura Phyllonitic Complex includes amphibolites ranging from N-MORB to T/P-MORB (ophiolitic slices) and mafic alkaline and peralkaline metavolcanics (autochthonous slices). At macroscopic scale, the autochthonous sequence of the Évora-Beja Domain is almost complete in the eastern region, with a stratigraphic sequence ranging from Precambrian to Silurian/Lower Devonian. Towards WSW, the Moura Phyllonitic Complex progressively become tectonically discordant on the sequence below, just near the suture, where it superposes Precambrian levels. The overall evidences (tectonic, metamorphic and geochemical) allow the conclusion that the Moura Phyllonitic Complex is an accretionary complex related with the obduction process during earlier times of the variscan ocean closure. Keywords: Accretionary ComplexVariscanIberiaSutureOphiolite

Obduction

10.3166/ga.18.375-388

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Contact metamorphism and dolomitization overprint on Cambrian carbonates from the Ossa-Morena Zone (SW Iberian Massif): implications to Sr-chronology of carbonate rocks

International Journal of Earth Sciences (2024)

José Roseiro Noel Moreira Laura Andrade Pedro Nogueira Daniel de Oliveira

Abstract The Cambrian Series 2 Carbonate Formation from the Alter do Chão Elvas-Cumbres Mayores unit (Ossa-Morena Zone, SW Iberian Massif) is composed of regionally metamorphosed marbles and marlstones that underwent chlorite zone metamorphism and preserve the primaeval limestone 87 Sr/ 86 Sr ratios (0.7083–0.7088). These are consistent with the established Lower Cambrian seawater curve, and therefore used for age constraints in formations lacking fossil contents. The regional mineralogical and Sr-isotopic features of the carbonate rocks are frequently overprinted by the effects of contact metamorphism induced by magmatic bodies emplaced during rift-related and synorogenic events of the Palaeozoic, as well as by post-metamorphic dolomitization processes. The development of calc-silicate minerals due to contact metamorphism is common in the rocks of the Carbonate Formation and apparently results from the interaction of the protolith with fluids of different origin: (i) internally produced fluids released by conductive heating (observed in external contact aureoles) and (ii) external intrusion-expelled fluids that, besides leading to the appearance of distinctive assemblages, also promote an influx of strontium content (observed in roof pendants). Calc-silicate mineralogy varies substantially throughout the region, likely due to the heterogeneous distribution of silicate minerals of the protolith, progression of intrusion-driven fluids, and the irregular effect of thermal gradients. Results suggest that high-grade contact metamorphism (hornblende facies or higher) and dolomitization processes imposed on the Carbonate Formation significantly influence the isotopic signatures of the carbonates, providing limitations in applying Sr-isotopic chronology. Graphical abstract

Massif

Dolomitization

10.1007/s00531-024-02476-w

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Variscan ophiolites and related high-pressure metamorphism in southern iberian variscan folbelt

Cadernos do Laboratorio Xeolóxico de Laxe: Revista de xeoloxía galega e do hercínico peninsular (2004)

Alexandre Araújo J. Munhá Paulo E. Fonseca Jorge Pedro José Carlos Teixeira

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The Finisterra-Léon-Mid German Cristalline Rise Domain; Proposal of a New Terrane in the Variscan Chain