Abstract
The anorogenic complex of Evisa (Corsica) is made up of riebeckite hypersolvus granite and of albite-riebeckite-aegirine granite. Ten samples from the southern part of the complex provided Rb-Sr whole-rock isochrons for each facies. The ages of the two granites are indistinguishable at 246±7m.yr. corresponding to the Upper Permian. 87Sr/86Sr initial ratio (0.7034±0.0011) is in the mantle range of values and precludes any important crustal contamination. Li and Rb contents are controlled by the peralkaline fluid phase, reflected by deuteric changes. These alterations are weak in the hypersolvus facies but are obvious in the albite facies: replacement of preexisting perthite by albite, late precipitations of aegirine and fluorite, associated weak mineralization. The low value of 87Sr/86Sr initial ratio and the similarity of this ratio for both facies indicate that the fluid phase interacted with the crystallized rocks soon after the emplacement of the complex and provoked autometamorphic reactions without important external supplies.
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