The role of halogens and sulfur in apatite in assessing the potential ore content of granitoids of the Tigertysh complex (Kuznetsk Alatau)

The study of the halogen (F and Cl) and sulfur contents in apatite from granodiorites and leucogranites of the Tigertysh complex (gЄ-O1t) was carried out, which may indicate the potential ore content of granitoids. Apatites of granodiorites are confined mainly to amphibole grains, less often located in quartz and feldspars, and correspond in composition to fluorapatite (F = 2.45—2.76 wt. %, Cl = 0.02—0.03 wt. %). In leucogranites, apatite is confined to feldspars and biotite, and corresponds in composition to hydroxyl- and fluorapatite (F = 1.50—1.80 wt. %, Cl = 0.33—0.52 wt. %). In apatite from granodiorites, the sulfur content is maximum in grains confined to amphibole and is 0.05–0.11 wt. %, while in apatite from quartz and feldspars it is no more than 0.04 wt. %. The sulfur content in apatite from leucogranites does not depend on its confinement to different minerals and is 0.04—0.07 wt. %. Based on the F, Cl и S contents in apatites of granitoids of the Tigertysh complex, it can be assumed that gold-sulfide-quartz mineralization may be associated with granodiorites, and Cu-porphyry mineralization with leucogranites.