Geologicheskii Vestnik

The article presents the results of the analysis of some geochemical features of the clayey rocks of the Suirovo Formation (Bashkirian meganticlinorium, Southern Urals). It is shown that the Zr/Sc and Th/Sc ratios in mudstones, as well as a number of lithochemical modules, gives reason to believe that thin-grained aluminosilicoclastics of the first sedimentation cycle prevails in their composition. The distribution of the mudstone data points on the La/Sc — Th/Co and Cr/Th — Th/Sc diagrams indicates the presence of a noticeable part of the products of destruction of the basic igneous rocks. The same can be assumed on the basis of their inherent average values (La/Yb) N and Eu/Eu*. Localization of the mudstone data points on the (La/Yb) N — Eu/Eu* diagram with fields characterizing the composition of the fine-grained suspension of the estuarine parts of modern rivers of different categories suggests that the provenances of the Suirovo basin were composed of a diverse complex of rocks (sedimentary rocks, acidic and basic igneous and volcanic rocks), and the rivers that transported thin-grained aluminosilicoclastics were classified as large. On the Th — La — Sc diagram, the mudstone data points tend to the field of compositions typical of oceanic island arcs, which is consistent with their position on the (Fe2O3* + MgO) — Al2O3/SiO2 diagram.

Suirovo Formation, Upper Proterozoic, Southern Urals, clayey rocks, geochemistry

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