Resumen de Las dioritas de Palamós (Cadenas Costeras Catalanas): emplazamiento y cristalización
L. Pérez, Pere Enrique Gisbert, M. Delaloye
This paper is a case study of one of the mafic-felsic associations of the Hercynian ca/c-azkaline Cata/onian Coastal Ranges Batholith (NE Spain). Origin, emplacement and cristallization paths of magmas are the aim of the paper. Palamós outcrop shows a quartz-diorite included mainly as enclaves of different shapes and compositions in a feldspar megacrystic biotite-granodiorite host. Multistage magma mingling between two different contrasted magmas seems to be the only way to explain the special features. Re/ationships between these rocks suggest that they have coexisted in a magmatic state. Two main stages have been recognized through petrological and geochemical studies: own evolution befare mixing and interaction and empfacement of both magmas. Thermal equilibrium between them and magmatic movements allows c.rystal and chemica/ exchanges in different ways and proportions as crystallization goes on. The effects are acJdification of basic magma and basification of the acid one. This process seems to affect only the peripheral part of both intrusions.
