Metapelitas de alta presión de la Unidad de Badajoz-Córdoba (Macizo Ibérico)la sutura del Devónico Superior del Orógeno Varisco
- R. Arenas 1
- I. Novo-Fernández 1
- A. García-Casco 2
- R. Díez Fernández 3
- J.M. Fuenlabrada 1
- M.F. Pereira 4
- J. Abati 1
- S. Sánchez Martínez 1
- F.J. Rubio Pascual 3
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1
Universidad Complutense de Madrid
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2
Universidad de Granada
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3
Instituto Geológico y Minero de España
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4
Universidade de Évora
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ISSN: 1576-5172
Année de publication: 2021
Titre de la publication: X Congreso Geológico de España
Número: 18
Pages: 394
Type: Article
D'autres publications dans: Geotemas (Madrid)
Résumé
The Badajoz-Córdoba Unit (BCU) represents a high-P terrane mainly constituted by metapelites, metagreywackes, orthog- neisses, Grt-amphibolites and highly retrogressed eclogites. The high-P metamorphic event has been dated at c. 377 Ma. Rare metapelites with well-preserved high-P mineral assemblages have been discovered in the unit. They appear as foliated white-colored rocks, in which large pinkish-red garnets up to 1 cm in diameter with abundant inclusions stand out. The mine- ral assemblage of these metapelites includes garnet, chloritoid (up to XMg = 0.32), kyanite, staurolite, chlorite, phengite (up to Si = 3.16 apfu), paragonite, margarite and rutile. Pseudosection modelling of representative samples indicates that this mineral assemblage formed during a first high-P metamorphic event at P> 20 kbar and T= c. 525°C (blueschist-eclogite facies), followed by a severe exhumation with moderate heating. The BCU can be correlate with other equivalents high-P and low-intermediate-T units in the Iberian Massif, and also all along the Variscan Orogen from Iberia to the Bohemian Massif.