Abstract
The Salas-Belmonte intrusive group outcrops in the westernmost part of the Cantabrian Zone (Iberian Massif). It is formed by rocks ranging in composition from gabbro to monzogranite. The group represents a case of cafemic, potassium rich, calc-alkaline and late-orogenic magmatism. Trace and REE contents and patterns, together with petrographic data, point to an enriched or not, subcontinental lithosphere as the mantelic primitive magmas source, later modified by hybridization/assimilation processes with crustal melts. Fractional crystallization processes at upper crust levels played likely a minor role.
