RT Journal Article
T1 A unique blueschist facies metapelite with Mg-rich chloritoid from the Badajoz-Córdoba Unit (SW Iberian Massif): correlation of Late Devonian high-pressure belts along the Variscan Orogen
A1 Arenas Martín, Ricardo
A1 Novo Fernández, Irene
A1 Garcia Casco, Antonio
A1 Díez Fernández, Rubén
A1 Fuenlabrada Pérez, José Manuel
A1 Pereira, Manuel Francisco
A1 Abati Gómez, Jacobo
A1 Sánchez Martínez, Sonia
A1 Rubio Pascual, Francisco J.
AB The Badajoz-Córdoba Unit (BCU, SW Iberian Massif) is a Variscan high-P unit mainly constituted by metapelites, metagreywackes, orthogneisses, Grt-amphibolites, and retrogressed eclogites (high-P metamorphism at c. 377 Ma). Discovery of rare metapelites with well-preserved high-P mineral assemblages, including large garnets up to 1 cm in diameter with abundant inclusions, chloritoid (up to XMg = 0.32), kyanite, staurolite, chlorite, phengite (up to Si = 3.16 apfu), paragonite, margarite, and rutile, allows detailed determination of the tectonothermal evolution of the unit. Pseudosection modelling of representative samples indicates that this mineral assemblage formed in blueschist facies (near eclogite facies transition) at P conditions higher than 20 kbar at c. 525°C and that it underwent a subsequent severe exhumation and moderate heating. The lithological composition of the BCU, the age of high-P metamorphism and the characteristics of the high-P mineral assemblages are similar to those found in other high-P and low to intermediate-T units of the Variscan Orogen. All these units form part of a single blueschist-eclogite facies metamorphic belt formed during Late Devonian subduction of the external margin of Gondwana.
PB Taylor and Francis
SN 0020-6814
YR 2021
FD 2021
LK https://hdl.handle.net/20.500.14352/7806
UL https://hdl.handle.net/20.500.14352/7806
LA eng
NO (Ministerio de Economía, Industria y Competitividad
DS Docta Complutense
RD 3 oct 2024