Geologicheskii Vestnik

The lithochemical features of clayey rocks of the Upper Proterozoic Suirovo Formation of the western slope of the Southern Urals are considered. Based on the distribution of mudstone data points on the (Na2O+K2O)/Al2O3 – (Fe2O3*+MgO)/SiO2 diagram, it was concluded that the studied rocks are a mixture of kaolinite, smectite with an admixture of kaolinite and illite, and chlorite-smectite-illite clays. The composition of mudstones is dominated by petrogenic material. Mudstones were not affected by K-metasomatism and silici cation processes. In terms of the hydrolyzate modulus (HM), the clayey rocks of the Suirovo Formation are predominantly normohydrolysates (HMaverage is 0.41±0.06). The average value of the CIA for mudstones is 74±4. Apparently, the formation of thin-grained aluminosilicoclastics on paleo-catchments during the accumulation of deposits of the Suirovo Formation took place in a warm humid climate, or the indicated paleo-catchments were composed of rocks dominated by the products of such weathering. The distribution of the data points of mudstones on a number of diagrams, which make it possible to judge the composition of rock complexes eroded in paleo-catchment areas, does not make it possible to draw a de nite conclusion. On different paleogeodynamic diagrams, the data points of the mudstones of the Suirovo Formation also located in the different elds, therefore, to select the “most correct” of them, additional data are needed.

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

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