Articles | Volume 11, issue 6
Solid Earth, 11, 2303–2325, 2020
https://doi.org/10.5194/se-11-2303-2020

Special issue: The Iberian Massif in the frame of the European Variscan...

Solid Earth, 11, 2303–2325, 2020
https://doi.org/10.5194/se-11-2303-2020

Research article 30 Nov 2020

Research article | 30 Nov 2020

Unraveling the origins and P-T-t evolution of the allochthonous Sobrado unit (Órdenes Complex, NW Spain) using combined U–Pb titanite, monazite and zircon geochronology and rare-earth element (REE) geochemistry

José Manuel Benítez-Pérez et al.

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Revised manuscript not accepted

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Cited articles

Abati, J., Dunning, G. R., Arenas, R., Díaz García, F., González Cuadra, P., Martínez 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. Sc. Lett., 165, 213–228, https://doi.org/10.1016/S0012-821X(98)00268-4, 1999. 
Abati, J., Arenas, R., Martinez Catalán, J. R., and Díaz García, F.: Anticlockwise P-T Path of Granulites from the Monte Castelo Gabbro (Ordenes Complex, NW Spain), J. Petrol., 44, 305–327, https://doi.org/10.1093/petrology/44.2.305, 2003. 
Abati, J., Castiñeiras, P., Arenas, R., Fernández-Suárez, J., Barreiro, J. G., and Wooden, J. L.: Using SHRIMP zircon dating to unravel tectonothermal events in arc environments. The early Palaeozoic arc of NW Iberia revisited, Terra Nova, 19, 432–439, https://doi.org/10.1111/j.1365-3121.2007.00768.x, 2007. 
Abati, J., Gerdes, A., Suárez, J. F., Arenas, R., Whitehouse, M. J., and Fernández, R. D.: Magmatism and early-Variscan continental subduction in the northern Gondwana margin recorded in zircons from the basal units of Galicia, NW Spain, Bull. Geol. Soc. Am., 122, 219–235, https://doi.org/10.1130/B26572.1, 2010. 
Aerden, D. G. A. M.: Correlating deformation in Variscan NW-Iberia using porphyroblasts; implications for the Ibero-Armorican Arc, J. Struct. Geol., 26, 177–196, https://doi.org/10.1016/S0191-8141(03)00070-1, 2004. 
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Short summary
The Sobrado unit represents an allochthonous tectonic slice of exhumed high-grade metamorphic rocks formed during a complex sequence of orogenic processes in the middle to lower crust. We have combined U–Pb geochronology and REE analyses (LASS-ICP-MS) of accessory minerals in migmatitic paragneiss (monazite, zircon) and mylonitic amphibolites (titanite) to constrain the evolution. A Middle Devonian minimum age for HP metamorphism has been obtained.