The mineralogical and geochemical composition of the soils of
three representat ive pedons fanned on basaltic andesite, andes itic basalt and
phyllite were investigated. Results by XRF showed that progressive
weathering of rocks have been marked by gradual accumulation of AI, Fe,
Ti, Mg. H30+ and depletion of Na, K, Ca and Si in the soi l; although,
predominant clay, loss and gain trend of...