Geologicheskii Vestnik

Petrographic and geochemical study of limestones from thin interlayers among terrigenous deposits of sections of the Kazanian stage in the Southern Urals was carried out. It is established that carbonate rocks from three sections (Sukhoy Izyak, Sabantuy and Kuzminovka limestone quarry) are represented by a single genetic type of rocks. They correspond to micrite and bioclast-micrite limestones of the wackestone structure containing peloids, relics of shallow-water marine organisms, and signs of development of microbialites. Lithological features indicate a short-term transgression and a shallow-sea littoral environment in the studied area during the Kazanian age. The chemical composition of limestones confirms their genetic proximity, indicating minor differences in the influence of terrigenous-clay or lagoon-chemogenic material.

Southern Urals, limestone, chromite content, petrography

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