Geologicheskii Vestnik

The distribution of fluorine in various lithological types of rocks in the West Aktash ore zone was studied. This zone is part of the Aktash ore fi eld located in the middle and upper riphean sediments in the southern part of the Bashkir meganticlinorium 15–20 km southwest of the village Verkhniy Avzyan. Variable and relatively high fluorine contents were found in sandstones (<0.01–0.05 wt. %) and shales (0.1–0.63 wt. %). The highest fluorine content, reaching 1.22 wt. %, found in calcareous skarns that formed on an exocontact with gabbro-dolerites as a result of a bimetasomatic process when exposed to weakly or moderately acidic chloride-fluoride post-magmatic solutions. Fluorine in sandstones is a part of mainly muscovite and, to a lesser extent, apatite, in shale – muscovite of later generation, and in calcareous skarns – fluorite. The zonal distribution of fluorine in schists is established, which is controlled by their position in the section relative to dikes of gabbro-dolerite. The highest fluorine content is observed in the host rocks on the western side of the dikes. The enrichment of shales occurred as a result of additional fluorine inflow by post-magmatic fluids, the circulation of which took place in the already folded structure of the West Aktash ore zone. The obtained data cast doubt on the relationship of high fluorine contents in Riphean rocks with evaporite sedimentation conditions.

fluorine, West Aktash ore zone, F-containing muscovite, post-magmatic fl uids, fl uorite, riphean deposits, Bashkir meganticlinorium

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