Evolución metamórfica de los esquistos de AP/BT de Ceán (Unidad de Malpica-Tui, NW del Macizo Ibérico)
Year: 2007
Type: article
Abstract: Metapelitic schists from the upper structural levels of the Malpica-Tui Unit contain an initial blueschist \nfacies mineral assemblage that appears mainly preserved as micro-inclusions in garnet, albite and chloritoid \nporphiroblasts defining a S1 foliation. The main foliation (S2) represents an evolution of the S1 to slightly \nhigher temperature and lower pressure, but it is still developed in blueschist facies conditions. Post-S2 \ndeformations include restricted development of spaced C’ shear bands, tight and straight D3 folds and a \nlater gentle subhorizontal crenulation formed in greenschists facies conditions. Garnet-phengite thermometry \nand GRIPS and GASP barometry calculations, using micro-inclusion compositions, indicate peak conditions \naround P=19-22 Kbar and T=430-500 ºC. The same calculations using the S2 fabric minerals yield \napproximate values of P=16-19 Kbar and T=440-515 ºC
Authors: Alicia López-Carmona, Jacobo Abati, J. Reche
Language: Spanish
Subfield: Geochemistry and Petrology
Field: Earth and Planetary Sciences
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2118950587