Coronitic metagabbros from the Sobrado Unit (Órdenes Complex, NW Iberian Massif). IIThermobarometry and P-T path
- Arenas Martín, Ricardo
- Martínez Catalán, José Ramón
ISSN: 0213-683X
Ano de publicación: 2002
Número: 32
Páxinas: 103-106
Tipo: Artigo
Outras publicacións en: Geogaceta
Resumo
Three types of corona textures developed in metagabbros of the Sobrado Unit. Detailed thermobarometry, carried out in groups II and III coronas, together with inferred P-T conditions for group I coronas, show that the corona textures were generated during a drastic and virtually isothermal increase in pressure. Highest P-T conditions, registered in group III coronas, reached 660-770 °C and 13-17 kbar. Subduction of a relatively thin slice of arc-related crust below a mantle wedge, either with an intact thermal structure or heated and thermally softened in a relatively inner part of a volcanic arc, is suggested as the probable dynamic setting to explain the P-T path found in the coronitic metagabbros