Regional patterns of zoning hypergenic transformations of sedimentary rocks of the middle Permian age of the Eastern Zakamye

Abstract

The article is devoted to the study of eluvial deposits in the territory of the Eastern Zakamye. Due to the activity of river erosion, a highly dissected and rugged terrain has formed in this area. Its characteristic elements are erosion-denudation watersheds spaces separated by narrow river valleys and terraced slopes. According to the results of the research, it was revealed that the difference in the structure of weathering profiles in carbonate and terrigenous soil massifs is due to the structural and mineralogical features of rocks acquired at the stage of sedimentation and subsequent diagenesis. In the central part, at the upper plateau site, the rocks underwent mainly physical weathering processes, at the middle plateau site – chemical weathering processes, at the lower plateau site – physical and chemical weathering processes. Such selectivity in the manifestation of hypergenic processes is due to the predominant lithotypes of sedimentary rocks composing the upper, middle and lower plateau surfaces of the plateau of the studied territory. Based on the completed study, the zoning of the territory of the Eastern Zakamye was carried out and an engineering and geological map was built. The results obtained make it possible to understand the mechanism of weathering in carbonate and terrigenous rocks, and, consequently, to assess the potential change in the physical and mechanical properties of rocks, both during construction and during the operation of buildings and structures.