Geologicheskii Vestnik

The geochemical characteristics of the Frasnian greywackes of the western limb of the Khudolaz syncline (West-Magnitogorsk zone of the Southern Urals) are given on the basis of more than 100 samples, in which the content of major and minor elements was established. The analysis of geochemical data made it possible to establish the characteristic features of the greywacke composition of each of the studied stratigraphic units (the upper part of the Ulutau Formation, the Mukasevo Formation, the Yalangas, Idyash-Kuskarovo and Khudolaz lenses of the lower part of the Biyagoda Formation) and relate them to the petrographic composition. It is shown that the differences between sandstones of different intervals of the section are most clearly manifested in the diagrams Ni – Cr, Cr/V – Y/Ni, Cr/Al2O3 – Zr/Al2O3 and Cr/Al2O3 – Y/Al2O3. In terms of the ratio of the main elements, the studied rocks correspond to volcanoclastic graywackes of acidic (Yalangas lens) and middle (upper part of the Ulutau Formation, Idyash-Kuskarovo and Khudolaz lenses of the Biyagoda Formation) composition. The degree of weathering at the source of drift was low, and complexes of oceanic island arcs were destroyed. Sandstones of the Mukasevo Formation differ from the others, presumably due to the relatively longer presence of clastic material in the migration routes.

geochemistry, the Ulutau Formation, the Mukasevo Formation, the Biyagoda Formation, the Frasnian, greywacke, the South Urals

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