Estudio de las tierras raras en las bauxitas kársticas del Noroeste de la Península Ibérica

Abstract

The bauxite deposits from Northeastern Iberian Peninsula are geochemically studied in this paper. Major, minor, trace and rare earth elements are determined by ICP spectroscopy in fifteen samples from three different zones: Southpyrenees, Catalánides y Maestrazgo. According to La/Y and europium anomaly values, the sedimentation environment during the genesis of bauxites had an acid and reducent character. This conclusion is agree with Petraschek's (1989) model for this type of ore deposits. The different methods here included (factor analysis, rare earth elements accumulation coefficients, etc.) reveal a great homogeneity in the characteristícs of the parent rocks of the different bauxite deposits. These parent rocks had probably an intermediate geochemical character. From a paleogeographic point of view, the parents rocks were related to rocks of permíc-triassic-lower jurassic age.