Material composition of Lower Triassic sandstones from the northern areas of the Timan-Pechora oil and gas province

Abstract

Recently various authors paid much attention to accessory minerals of clastic rocks to clarify the composition of the source area and formation conditions of terrigenous deposits. The paper describes some minerals of the heavy fraction of Triassic sandstones in the north of the Timan-Pechora oil and gas province (garnet, epidote, chromium spinels, ilmenite, etc.). We showed that the enrichment of sandstones with various mineral grains was controlled by not only the composition of the eroded rocks, but also by the hydrodynamics of the flow, as well as the method of transfer of clastic material. We noted that the features of heavy fraction minerals could be used to reconstruct sedimentation environments, taking into account their physical and chemical properties, distribution of minerals by fractions, and their stability during transportation.