Caracterización de rellenos fisurales por desequilibrios isotópicos de series radiactivas naturales. El caso del batolito granítico de El Berrocal

Abstract

The isotopic ratios obtained for geological materials from the granitic batholith of El Berrocal show values very close to equilibrium, like in a geochemically closed system, for the fresh granitic rock. The fracture fillings studied present values with a disequilibrium between radionuclides. This is due to the existance in the system of mobilization/retention phenomena for these elements. The fracture fillings have been sequentially leached and the results show that Uranium is preferently bound to the adsorbed and iron-rich phases. Thorium, with a lower geochemical mobility, is related mainly to the residual or detritical phases.