Abstract
Geochemical studies of fresh biotite granite, albite-riebeckite and riebeckite-aegirine granites from the Ririwai Complex indicate that these rocks contain enhanced concentrations of Sn, Nb, Zn, Ta, Rb, Li, F, SiO 2, K 2O and Na 2O, and are depleted in Sr, Cs, CaO, MgO and Al 2O 3. This element dispersion reflects mineralization and indicates orebearing potential. The geochemical data from the biotite granite are examined by R-mode factor analysis and help to isolate factors accounting for element dispersion. A five-factor model accounts for 65% of the total data variance and relates sample composition to lithology, mineralization and alteration. The granitic rocks are characterized by high values of Sn, Nb, Zn, Ta, Li, Rb, and F but ore-forming processes are related to postmagmatic changes.
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