Articles | Volume 11, issue 6
Solid Earth, 11, 2303–2325, 2020

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

Solid Earth, 11, 2303–2325, 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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Solid Earth Discuss.,,, 2020
Revised manuscript not accepted

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Subject area: Tectonic plate interactions, magma genesis, and lithosphere deformation at all scales | Editorial team: Structural geology and tectonics, rock physics, experimental deformation | Discipline: Structural geology
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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,, 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,, 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,, 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,, 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,, 2004. 
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.