Geologicheskii Vestnik

The mineralogical and geochemical features of carbonate rocks of the Lapyshta Subformation of the Suran Formation of the Lower Riphean were studied in one of the sections in the northern part of the Yamantau anticlinorium. The rocks of the section are mainly represented by low-dolomite and dolomite limestones. The content of fl uorine in rocks (n = 25) varies from less than 100 to 4080 g/t (average 1128 g/t), chlorine – 50–225 g/t (average 107 g/t). The multidirectional geochemical behavior of F and Cl in the rocks was revealed. The highest fluorine contents exceeding its clarke in carbonate rocks by 5–12 times, are found in dolomite limestones and low-calcite dolomites exposed in the section of а fault zone, chlorine – in the least altered dolomitic limestones. Fluorine is concentrated mainly in phlogopite, F-containing muscovite and fluorapatite. Two alternative scenarios of the enrichment of carbonate rocks with fluorine have been proposed, in the first of which it is associated with the activity of magmatogenic fluids in the zones of submeridional regional Karatash and Suran faults. The second scenario confirmed to date by a large amount of geological and geochemical data, implies enrichment in fluorine as a result of unloading of evaporite fluids that have undergone catagenetic evolution.

fluorine, chlorine, phlogopite, F-containing muscovite, Lapyshta subformation of the Suran suite, Riphean deposits, Yamantau anticlinorium, Bashkir meganticlinorium

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