Geologicheskii Vestnik

Using clay rocks of the Riphean stratotype (Bashkir meganticlinorium, Southern Urals) as an example, we compared the results of reconstructing the composition of provenances of fine-grained aluminosiliciclastics obtained by dint of a number of discriminant diagrams (Al2O3 — TiO2, Zr — TiO2, Y/ Ni — Cr/V, Cr/Th — Th/Sc, etc.). It is shown that the data points of individual clay rock samples on most diagrams form a fairly compact area in which their sets, belonging to different strata, have a significant overlap. In diagram F1 — F2, data points of clay rocks are present in all its classification fields, and the areas of points of different formations/subformations often do not overlap. In general, almost all the charts we analyzed provide fairly comparable results.

Bashkirian meganticlinorium, Riphean, mudrocks, diagrams for provenance reconstruct-tion

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