Articles | Volume 7, issue 2
Research article
13 Apr 2016
Research article |  | 13 Apr 2016

Insights on high-grade deformation in quartzo-feldspathic gneisses during the early Variscan exhumation of the Cabo Ortegal nappe, NW Iberia

Francisco José Fernández, Sergio Llana-Fúnez, Pablo Valverde-Vaquero, Alberto Marcos, and Pedro Castiñeiras

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Revised manuscript not accepted

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Cited articles

Ábalos, B., Puelles, P., and Gil Ibarguchi, J. I.: Structural assemblage of high-pressure mantle and crustal rocks in a subduction channel (Cabo Ortegal, NW Spain), Tectonics, 22, 1006,, 2003.
Abati, J., Dunning, G. R., Arenas, R., Diaz García, F., Gonzalez Cuadra, P., Martinez Catalán, J. R., and Andonaegui, P.: Early Ordovician orogenic event in Galicia (NW Spain): evidence from U-Pb ages in the uppermost unit of the Ordenes Complex, Earth Planet. Sci. Lett., 165, 213–228, 1999.
Albert, R., Arenas, R., Sánchez-Martínez, S., and Gerdes, A.: The eclogite facies gneises of the Cabo Ortegal Complex (NW Iberian Massif): Tectonothermal evolution and exhumation model, J. Iber. Geol., 38, 389–406, 2012.
Albert, R., Arenas, R., Gerdes, A., Sánchez-Martínez, S., Fernández-Suárez, J., and Fuenlabrada, J. M.: Provenance of the Variscan Upper Allochthon (Cabo Ortegal Complex, NW Iberian Massif), Gondwana Res., 28, 1434–1448, 2015.
Arenas, R., Gil Ibarguchi, J. I., González-Lodeiro, F., Klein, E., Martínez Catalán, J. R., Ortega Gironés, E., de Pablo-Maciá, J. G., and Peinado, M.: Tectonostratigraphic units in the complexes with mafic and related rocks of the NW of the Iberian Massif, Hercynica, 2, 87–110, 1986.
Short summary
High-grade gneisses record two partial melting events: early Ordovician and early Variscan. Primary sedimentary layering is well preserved locally at the top of the sequence. First stage of the exhumation process occurred in ∼ 10 Ma. Strain was progressively localized along the boundaries of the migmatitic qz-fsp gneisses. Deformation reduced substantially the thickness of the gneissic rock sequence. "Internal" extrusion of the migmatites is documented.