Geologicheskii Vestnik

The results of the mineralogical and geochemical study of alluvial deposits of the Bolsheinzer (Bzyak stream) and Suran Formations (Karaelga stream) are presented. Quartz (predominant), feldspar, epidote, kaolinite, muscovite, dolomite and accessory minerals (goethite, hematite, rutile, titanite, magnetite, pyrite, monazite, zircon, fluorite) are found in the mineral composition. A comparative analysis of the geochemical characteristics of various types of zircons from the Suran and the Bolsheinzer Formations shows that they are genetically heterogeneous. The most rich in Th and U are rounded red zircons from the alluvial deposits of the Suran Formation. The Th/U ratio in them varies from 0.13 to 0.50, and in zircons of hyacinth colour — 0.47–1.78. At the same time, the few data obtained on red zircons from the deposits of the Bolsheinzer Formation show that they are geochemically (absence of U, Y, low Th concentrations) differ from the red zircons from the alluvial deposits of the Suran Formation. In the alluvial sediments of the Suran Formation, relatively high contents of Zr, Co, Cr, Ni, Zn, Pb, Y, and also REE, which in total amount make up about 600 g/t, were revealed. The most likely minerals for lanthanide concentrators are apatite and monazite. Gold was first found in alluvial sediments of the Karaelga stream, in which a high assay (about 940) and Au/Ag ratio was found, on average equal to 16.5, which is slightly different from the composition of gold from primary deposits and ore manifestations of the Avzyan ore region in the Yamantau anticlinorium.

Bolsheinzer suite, Suran suite, mineralogical composition, zircon, impurity elements, gold

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