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oai:docta.ucm.es:20.500.14352/1030642025-03-18T15:16:16Zcom_20.500.14352_14col_20.500.14352_15

Evolución metamórfica de los esquitos de AP/BT de Ceán (Unidad de Malpica-Tui, NW del Macizo Ibérico) Metamorphic evolution of the HP/LT Ceán schists (Malpica-Tui Unit, NW Iberian Massif) López Carmona, Alicia Abati Gómez, Jacobo Reche i Estrada, Juan 552.4(460) Variscan Belt Allochthonous Complexes Malpica-Tui Unit Blueschists facies thermobarometry Petrología 2506.13 Petrología Ignea y Metamórfica 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. Ministerio de Educación y Ciencia Depto. de Mineralogía y Petrología Fac. de Ciencias Geológicas TRUE pub 2024-04-12T14:05:13Z 2024-04-12T14:05:13Z 2007 journal article VoR https://hdl.handle.net/20.500.14352/103064 0213-683X 2173-6545 spa MEC (CGL2004-04306-CO2/BTE) open access application/pdf Sociedad Geológica de España