Structure of the Pre-Paleozoic Formation of the Central Urals Upliftin the Northern and Sub-Polar Urals and Its Relation with Golden Production
The Central Ural uplift occupies the near-watershed part of the Urals. It is composed of meta-terrigenous and meta-volcanogenic the Riphean–Vendian formations. Distributed folds, which were formed in several stages, and various tectonic faults are widespread. The study of these structures in the areas located in the Northern and Subpolar Urals showed their lateral and temporal variability, which was reflected in the difference in the morphology and nature of disturbances. On the Vodorazdelnaya area of the Northern Urals, as a result of thrust-fold deformations, a complex-fold structure of the stratum was formed, subsequently broken up by two near-meridional subparallel faults into blocks. On the Khalmerya area of the Subpolar Urals, there are several tectonic blocks bounded by gently dipping to the east and overlapping tectonic blocks that form a duplex structure. This series of thrust structures created a complex cover structure contrasting in composition and degree of deformation. Later, a northeastern strike-slip fault zone arose. The orientation of the early isoclinal folds in the rocks indicates pressure from the northeast, during the formation of tectonic scales and plates in the Precambrian basement. Then this pressure occurred from the southeast and the Lower Paleozoic sediments were involved in the thrust process. Differences in the features of the formation of structures, apparently, depend on the morphology of the eastern margin of the East European platform and the change in the vector of displacement of the thrust plate. The movement of the thrust plates within the continental margin occurred along the main surface of the fault, with which the thrust structures are articulated at depth. At the final stages, extended strike-slip-upthrust zones were established, which affected the distribution of the golden mineralization.