RT Journal Article
T1 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)
A1 Novo Fernández, Irene
A1 Arenas Martín, Ricardo
A1 Capitani, Christian de
A1 Pereira, M. Francisco
A1 Díez Fernández, Rubén
A1 Sánchez Martínez, Sonia
A1 Garcia Casco, Antonio
AB 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.
PB Elsevier
SN 0024-4937
YR 2021
FD 2021-04
LK https://hdl.handle.net/20.500.14352/7871
UL https://hdl.handle.net/20.500.14352/7871
LA eng
NO Ministerio de Economía, Industria y Competitividad (MINECO)
NO Ministerio de Ciencia e Innovación (MICINN)
NO FCT (Portugal)
NO IUGS-UNESCO
DS Docta Complutense
RD 26 ago 2024