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oai:docta.ucm.es:20.500.14352/78712023-08-25T16:15:07Zcom_20.500.14352_14col_20.500.14352_15

Tracking the Late Devonian high-P metamorphic belt in the Variscan Orogen: New constraints on the PT evolution of eclogites from the Cubito-Moura Unit (SW Iberian Massif) Novo Fernández, Irene Arenas Martín, Ricardo Capitani, Christian de Pereira, M. Francisco Díez Fernández, Rubén Sánchez Martínez, Sonia Garcia Casco, Antonio The Cubito-Moura Unit is a high-P metamorphic succession that occurs in the southern part of the Ossa-Morena Complex (SW Iberian Massif). It includes a series of metasedimentary, metafelsic and metamafic rocks affected by a high-P, low to intermediate-T metamorphic event during Late Devonian times. Geochemistry of the metabasic rocks reveals that the generation of the protoliths occurred in a supra-subduction zone setting during Late Ediacaran to Early Ordovician times, either in a back-arc or fore-arc context. The eclogites contain atoll-like garnets, omphacite, amphibole, phengite (up to Si = 3.38 apfu), paragonite, rutile and quartz. Thermodynamic modelling in the MnNCKFMASTH system indicates a high-P metamorphic event at ~24 kbar and ~ 585 °C followed by a thermal peak at ~19 kbar and ~ 630 °C, and a subsequent exhumation to ~15 kbar. This P-T path indicates deep subduction at c. 370 Ma of this arc-related section. The lithostratigraphy and tectonothermal evolution of the Cubito-Moura Unit are equivalent to that of a number of units along the Iberian, Armorican and Bohemian massifs that can be correlated as a part of the same Basal Allochthonous Terrane. These units define a single Late Devonian high-P, low- to intermediate-T metamorphic belt developed during the first stages of the Variscan Orogeny. 2023-06-17T08:59:55Z 2023-06-17T08:59:55Z 2023-06-17T08:59:55Z 2021-04 journal article https://hdl.handle.net/20.500.14352/7871 0024-4937 doi.org/10.1016/j.lithos.2021.106015 eng CGL2016-76438-P FPU16/05281 UIDB/04683/2020- ICT IGCP 683 restricted access Elsevier