Provenance types of the upper Precambrian deposits of Volga-Ural region

An analysis of composition distribution of the Riphean and Vendian clayey rocks (Volga-Ural region) on the (La/Yb)N-Eu/Eu* and (La/Yb)N-Th diagrams showed that the Upper Precambrian sedimentary sequences of this territory are composed mainly of material carried by the “large rivers” and rivers that drained sedimentary formations. The erosion products of “magmatic/metamorphic” terranes and volcanic provinces (all types of provinces play a subordinate role in their composition. This is in one way or another consistent with the previous data, but requires some adjustment.