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Título: | 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) |
Autor: | Novo Fernández, Irene; Arenas, Ricardo CSIC ORCID ; Capitani, C.; Díez Fernández, Rubén; Sánchez Martínez, Sonia; García-Casco, Antonio | Palabras clave: | Eclogites Thermodynamic modelling SW Iberian Massif Variscan Orogen Variscan correlations |
Fecha de publicación: | abr-2021 | Editor: | Elsevier BV | Citación: | Lithos - Amsterdam 386-387 (2021) | Resumen: | 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. | Versión del editor: | http://dx.doi.org/10.1016/j.lithos.2021.106015 | URI: | http://hdl.handle.net/10261/261911 | DOI: | 10.1016/j.lithos.2021.106015 | Identificadores: | doi: 10.1016/j.lithos.2021.106015 issn: 1872-6143 |
Aparece en las colecciones: | (IACT) Artículos (IGME) Artículos |
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Novo-Fernandez et al 2021.pdf | 17,2 MB | Adobe PDF | Visualizar/Abrir |
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