Geologicheskii Vestnik

Comparison of data on the composition of sources of sandy material for the Vendian Kukkarauk Formation on the western slope of the Southern Urals, obtained using micropetrographic and lithochemical approaches and methods, is performed. Micropetrographic analysis of the composition of sandstones, the sandy matrix of conglomerates, and pebbles of conglomerates gives grounds to assert that sedimentary and metasedimentary rocks prevailed in the paleowatersheds of the Kukkarauk time; igneous and volcanic formations played a subordinate role. Information on the bulk chemical composition of sandstones and the sandy matrix of conglomerates suggests that, being generally lithogenic (second cycle and more) rocks, they could be formed both as a result of erosion of sedimentary and metasedimentary formations, as well as of mafic igneous rocks (the latter, however, are absent both in the framework of psammites, and among pebbles of conglomerates). A comparison of all the above allows us to conclude that in the case of the Kukkarauk Formation, the lithochemical approaches available in the literature, based on the analysis of the content and ratio of the main rock-forming oxides, do not allow us to obtain information on the composition of the source rocks of clastic material comparable to what we have as a result of detailed micropetrographic study of psammites, pebbles and sandy matrix of conglomerates.

Southern Urals, Vendian, Kukkarauk Formation, petrography, lithochemistry, composition of provenances

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