Javier Fernández‐Suárez

Universidad Complutense de Madrid

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Gabriel Gutiérrez‐Alonso

Universidad de Salamanca

Ricardo Arenas

Universidad Complutense de Madrid

J. Brendan Murphy

St. Francis Xavier University

Teresa E. Jeffries

Natural History Museum

Sonia Sánchez Martı́nez

Universidad Complutense de Madrid

Jacobo Abati

Universidad Complutense de Madrid

Alicia López-Carmona

Instituto de Geociencias

Rubén Díez Fernández

Instituto Geológico y Minero de España

J. Duncan Keppie

Universidad Nacional Autónoma de México

Axel Gerdes

Goethe University Frankfurt

Cooperative Institutions

Universidad de Salamanca

Universidad Complutense de Madrid

Universidad de Oviedo

Consejo Superior de Investigaciones Científicas

Instituto Geológico y Minero de España

Instituto de Geociencias

Centre National de la Recherche Scientifique

Planetary Science Institute

St. Francis Xavier University

Université de Rennes

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P-T-t constraints and geodynamic implications from blueschists and eclogites of the north Gondwanan margin in Iberia (Malpica-Tui complex, Galicia)

Alicia López-Carmona Jacobo Abati Pavel Pitra J.K.W. Lee Javier Fernández‐Suárez

The Malpica-Tui complex (MTC) in the NW Iberian Massif consists of rocks of Gondwanan affinity. It preserves evidence of late Devonian high-pressure (HP) metamorphism varying from eclogite (P~ 26 kbar and T~ 650 °C) to blueschist facies conditions (19-22 kbar and 460-560 °C). Thermodynamic modelling on the HP rocks reveals a P-T path characterised by a sub-isothermal decompression to ~10 kbar, at 480°C in the blueschist-facies rocks and 650 °C in the eclogites, followed by cooling to ~5 kbar at 380°C and 500 °C, respectively. New 40 Ar/ 39 Ar data corroborate a minimum age of ~ 370 Ma for the subduction-related HP metamorphism. Subsequent decompression to pressures of about 10 kbar started at ~ 360 Ma and was contemporaneous with thrust-and-fold nappe tectonics and intrusion of early Variscan granodiorites dated at ~ 350-340 Ma. Final exhumation due to the late orogenic gravitational collapse of the orogenic pile, associated with the main detachment system, has been constrained from ~ 340-335 Ma to 320±5 Ma, which is the age of the syntectonic leucogranites constrained by U-Pb (Lopez-Moro et al., this volume), emplaced in the autochthon of the MTC. Peak P-T conditions correspond to an approximate depth of 70-80 km and a geothermal gradient of 6-7°C km -1 , attributable to a cold subduction zone. Age differences between the HP event and the beginning of the post-nappe tectonics indicate that the exhumation of the MTC lasted about 15-20 Ma. The nearly isothermal decompression from ~ 26 to 10 kbar provides a vertical component exhumation rate of about 2-2.5 mm/year from ~ 80 to 30 km depth. The last stages of exhumation from 8 to 5 kbar occurred within a period of about 10-15 Ma (from 350 to 340-335 Ma) and from ~ 480-380°C, indicating a cooling rate of 7°C Ma -1 (or a geothermal gradient of 10°C km -1). These rates suggest that exhumation took place in two stages: (1) a fast, almost isothermal one, followed by a (2) slower episode with substantial cooling once the rocks reached the upper crust.

Blueschist

Orogeny

10.13140/2.1.4048.0001

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Citations (3)

Crustal melting and recycling: geochronology and sources of Variscan syn-kinematic anatectic granitoids of the Tormes Dome (Central Iberian Zone). A U–Pb LA-ICP-MS study

International Journal of Earth Sciences (2017)

Francisco Javier López Moro Miguel López Plaza Gabriel Gutiérrez‐Alonso Javier Fernández‐Suárez Alicia López-Carmona

Geochronology

Anatexis

Migmatite

Leucogranite

Devonian

10.1007/s00531-017-1483-8

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Citations (28)

Compositional data of mafic rocks in ophiolites of the Iberian Massif and the Anti-Atlas

Ricardo Arenas Sonia Sánchez Martı́nez Richard Albert Faouziya Haissen Javier Fernández‐Suárez

Origin of data: Compilation of published and new data, all of them obtained by the authors of the dataset using funding provided by Spanish I-D projects.

Massif

10.20350/digitalcsic/12510

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Citations (0)

Geochemistry and Sm–Nd isotopic sources of Late Ediacaran siliciclastic series in the Ossa–Morena Complex: Iberian–Bohemian correlations

International Journal of Earth Sciences (2021)

Esther Rojo‐Pérez José Manuel Fuenlabrada Ulf Linnemann Ricardo Arenas Sonia Sánchez Martı́nez

Massif

Basement

10.1007/s00531-020-01963-0

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Citations (27)

Geocronología de las rocas volcánicas de El Castillo ( Salamanca, Zona Centroibérica)

Geogaceta (2008)

Gabriel Gutiérrez‐Alonso J. B. Murphy Javier Fernández‐Suárez Hamilton

En este trabajo, presentamos los resultadosdel analisis geocronologico, medianteel metodo U-Pb en circones, de lasrocas volcanicas situadas en el alto de ElCastillo, en la Zona Centroiberica, en elnucleo del Sinclinal de Tamames.

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Citations (2)

La transición entre las Zonas Externas e Internas del Orógeno Varisco: niveles estructurales y partición de la deformación (Guia de campo)

G. Gutiérrez-Alonso F. Bastida Andrés Pérez‐Estaún Javier Fernández‐Suárez F. Nieto

134 paginas. XI Reunion del Grupo de Tectonica de la Sociedad Geologica de Espana, celebrada en Cangas del Narcea del 21-23 de septiembre de 1999

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The Vila de Cruces Ophiolite: A Remnant of the Early Rheic Ocean in the Variscan Suture of Galicia (Northwest Iberian Massif)

The Journal of Geology (2007)

Ricardo Arenas José R. Martı́nez Catalán Sonia Sánchez Martı́nez Javier Fernández‐Suárez Pilar Andonaegui

The Vila de Cruces ophiolite is one of the ophiolitic units involved in the Variscan suture of the northwest Iberian Massif. This ophiolite consists of a tectonically repeated succession of greenschist facies volcanic rocks, common alternations of metasediments of pelitic or siliceous character, and scarce orthogneisses, metagabbros, and serpentinites. The protolith age of a granitic orthogneiss that intruded the mafic rocks is dated at $$497\pm 4$$ Ma (U‐Pb in zircons). This age can be considered a reference for the generation of the ophiolite. According to their contents of some of the most immobile trace elements, the greenschist and the metagabbros are derived from basaltic magmas with compositions similar to those of island‐arc tholeiites. The influence of a subduction zone in the generation of the original basaltic magmas can be deduced from the marked negative Nb anomaly observed in all the metabasic rocks of this ophiolite. The granitic orthogneisses can also be genetically related to the basic rocks because they are similar to granitic rocks generated in volcanic arcs. The Vila de Cruces ophiolite is interpreted as a suprasubduction zone ophiolite generated in Late Cambrian times, during the early stages of the opening of the Rheic Ocean. The ophiolite was probably generated in a back‐arc basin developed during the first stages of the pulling apart and later drift of one or more peri‐Gondwanan terranes, one of them represented by the upper allochthon of the northwest Iberian Massif.

Massif

Greenschist

Protolith

Pelite

Allochthon

Volcanic arc

10.1086/510645

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Citations (122)

The basal tectonic mélange of the Cabo Ortegal Complex (NW Spain): Rock assemblages, involved terranes and paleogeographic scenario for the suture of Pangea

Zenodo (CERN European Organization for Nuclear Research) (2008)

Ricardo Arenas Sonia Sánchez Martı́nez Pedro Castiñeiras Javier Fernández‐Suárez Rubén Díez Fernández