Abstract
The Tanneron gneissic massif (Var department, SE France) contains calcsilicate gneiss lenses, some with scheelite mineralization. Mineralized and barren lenses have been sampled in the abandoned La Faviere tungsten mine (10 km W of Cannes). They are made up of concentric zones, namely a muscovite-free gneiss outer shell, a barren pyroxene gneiss zone, a mineralized pyroxene band and in places a marble core. Bulk rock and microprobe analyses have been made on each zone. The bulk rock geochemistry of the barren zones can be explained by isochemical transformation of a mixed limestone-greywacke protolith. On the other hand, because of their low Ti content, the scheelite-bearing zones are interpreted as metasomatized marble. Field observations and pyroxene, plagioclase and biotite compositions suggest that both mineralized and barren zones, at least partly, formed by infiltration metasomatism as products of a metasomatic column established at the marble-gneiss contact. Metasomatism is distinct from and post-dated the metamorphic formation of barren calcsilicate gneiss. It involved fluids with high W, F and Cl activity.
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