Abstract
The article presents the results of a study of the mineral composition, structural and textural features of sediments of the Ustchurochinskaya and Churochinskaya formations in the Krasnovisherskiy diamondiferous region. Rocks were studied with the petrographic analysis. According to the results of petrographic study, the composition of rocks of the Ustchurochinskaya and Churochinskaya formations was clarified. The rocks of the Ustchurochinsky formation were represented by siltstones, sandstones and gravelly sandstones. The rocks of the Churochinskaya formation are represented by tillite with interlayers of siltstones. The roof is represented micrograined dense dolomites. A detailed study of rock fragments of different genesis gives an idea of the sources. The Vendian deposits consist of erosion products of the underlying sediments of the Upper Riphean formations, volcanic rocks, granitoids and gneisses, the source of which are the Timan uplifts with outcrops of crystalline basement rocks of the Russkaja Plate.
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