Comparative metallogenic aspects of the granite and skarns of Kabylie of Collo and Filfila (North-East Algeria)

The Miocene granites of Kabylie of Collo and Filfila (North-eastern of Algeria) are peraluminous with a calc-alkaline affinity. They show substantial differences in terms of magmatic evolution and related metal contents. The Kabylie of Collo and the Filfila suites contain typical biotite and cordierite granites, but the latter group contains additional leucocratic facies which are enriched in Si, K, P, Li, F, B and rare-metals. This enrichment is related to a high degree of magmatic fractionation in the Filfila suite, whereas in Kabylie of Collo granites, a weak magmatic differentiation seems to have prevailed.Skarn occurrences associated with these two granite groups also display differences in their ore potential. The Filfila suite-associated skarns are enriched in rare-metals compared to those associated with Kabylie of Collo. Differences in the degree of magmatic evolution between these two suites seem to be provide an element in explaining the metallogenic differences between these granites and associated skarns.