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Título: | Evolución metamórfica de los esquistos de AP/BT de Ceán (Unidad de Malpica-Tui, NW del Macizo Ibérico) |
Otros títulos: | Metamorphic evolution of the HP/LT Ceán schists (Malpica-Tui Unit, NW Iberian Massif) | Autor: | López Carmona, A.; Abati, Jacobo CSIC ORCID; Reche, J. | Palabras clave: | Variscan Belt Allochthonous Complexes Malpica-Tui Unit Blueschists facies Thermobarometry |
Fecha de publicación: | 2007 | Editor: | Sociedad Geológica de España | Citación: | Geogaceta, 43 (2007), 3-6 | Resumen: | Metapelitic schists from the upper structural levels of the Malpica-Tui Unit contain an initial blueschist facies mineral assemblage that appears mainly preserved as micro-inclusions in garnet, albite and chloritoid porphiroblasts defining a S1 foliation. The main foliation (S2) represents an evolution of the S1 to slightly higher temperature and lower pressure, but it is still developed in blueschist facies conditions. Post-S2 deformations include restricted development of spaced C’ shear bands, tight and straight D3 folds and a later gentle subhorizontal crenulation formed in greenschists facies conditions. Garnet-phengite thermometry and GRIPS and GASP barometry calculations, using micro-inclusion compositions, indicate peak conditions around P=19-22 Kbar and T=430-500 ºC. The same calculations using the S2 fabric minerals yield approximate values of P=16-19 Kbar and T=440-515 ºC. | Descripción: | 43ª Sesión Científica. Móstoles, Noviembre de 2007 | Versión del editor: | http://www.sociedadgeologica.es/archivos/geogacetas/Geo43/Art01.pdf | URI: | http://hdl.handle.net/10261/8656 | ISSN: | 0213-683X |
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