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Docta Complutense
Article . 2009
Data sources: Docta Complutense
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The basal tectonic mélange of the Cabo Ortegal Complex (NW Iberian Massif): a key unit in the suture of Pangea

Authors: Arenas Martín, Ricardo; Sánchez Martínez, Sonia; Castiñeiras García, Pedro; Jeffries, Teresa E.; Díez Fernández, Rubén; Andonaegui Moreno, María Del Pilar;

The basal tectonic mélange of the Cabo Ortegal Complex (NW Iberian Massif): a key unit in the suture of Pangea

Abstract

[ES] Nuevos datos de campo y cartográficos en las unidades inferiores del Complejo de Cabo Ortegal, han proporcionado información relevante sobre la mélange tectónica situada en la posición estructural inferior: la Mélange de Somozas. Esta unidad de mélange tiene una potencia media de unos 1800 m y su aparición está restringida a la parte oriental del complejo; representa por tanto una gran unidad de mezcla localizada en el frente de avance de los complejos alóctonos del NW de Iberia. Tres conjuntos litológicos diferentes se distinguen en la mélange: 1) un conjunto formado por rocas ígneas mezcladas con serpentinitas, formando una mélange ofiolítica típica; 2) un conjunto metasedimentario con filitas y filonitas, con escasos conglomerados, mármoles y cuarcitas; 3) rocas metamórficas de alta-T con tipos variados de anfibolitas y ortogneises.

[EN] Recent field work and mapping in the lower units of the Cabo Ortegal Complex provided new data about the tectonic mélange that appears in the lowest structural position: the Somozas Mélange. This mélange unit with average thickness of 1800 m is restricted to the eastern part of the complex, and is located at the advancing front of the allochthonous complexes of NW Iberia. Three rock units are involved in the mélange: 1) an ophiolitic mélange consisting of igneous rocks mixed with serpentinites; 2) a metasedimentary unit with phyllites and phyllonites, with scarce conglomerates, marbles and quartzites; 3) high-T metamorphic rocks with varied types of amphibolites and orthogneisses.

Financial support for this research has been provided by Spanish project CGL2007-65338-CO2-01/BTE (Ministerio de Ciencia e Innovación).

Peer reviewed

Country
Spain
Keywords

U-Pb zircon geochronology, Petrología, Suture of Pangea, Rheic Ocean, Variscan Belt, Cabo Ortegal Complex, Cadena Varisca, Mélange ofiolítica, Océano Rheico, Ophiolitic mélange, arco de islas, geocronología U-Pb en circones, Complejo de Cabo Ortegal, Ophiolitic mélanges, Island arc, 552.4, sutura de Pangea

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This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
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