Alguns aspectos da alteração de granitóides da área de Oliveira de Azemeis - Castro Daire

Abstract

Results are presented of the chemistry and mineralogy of 6 weathering profiles on granitic rocks from the Oliveira de Azemeis - Castro Daire areal. Chemical evolution versus apparent specific weight using the Reiche's weathering potential index and product index, the Parker index and Ruxton index have been tested.The mineralogical composition of the minus 4 μm fraction by X-ray diffraction analysis has been determined.