Geologicheskii Vestnik

The mineralogical and geochemical features of carbonate rocks of the lower subformation of Inzer Formation of the Upper Riphean were studied in two outcrops along the river Zilim in the central part of the Alatau anticlinorium. The rocks of the sections are represented by dolomite-bearing, low dolomitic and dolomitic limestones. Dolomitization of limestones in both outcrops naturally increases with the growth of the stratigraphic column towards the top of the subformation and at the same time, from west to east towards the submeridional regional fault. In the rocks apparently both early diagenetic dolomitization and epigenetic with the formation of medium- and coarse-crystalline dolomite developed along syntectonic fractures are manifested. The content of uorine in rocks varies from less than 50 to 649 g/t (average 161 g/t), chlorine from 58 to 166 g/t (average 103 g/t). Fluorine reveals the strongest geochemical bonds with SiO2, Al2O3, K2O, TiO2, P2O5, chlorine with MgO, MnO, Fe2O3. The main mineral concentrators of F are muscovite and apatite and Cl is epigenetic dolomite. In some intervals of one of the studied sections the enrichment of rocks in F (444–649 ppm) and Sr (1221 ppm) was revealed, which exceeds the clarke by 1.5–2 times. The local accumulation of uorine and strontium could be associated either with short-term episodes of sedimentation close to evaporite, or be the result of the action of evaporite uids

uorine, chlorine, limestone, Inzer Formation, Upper Riphean, Bashkir meganticlinorium

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