TO THE STAGES OF THE DEVELOPMENT OF THE EARTH’S CRUST IN THE LIGHT OF MODERN KNOWLEDGE

Abstract

Within the limits of the Southern Urals, the mechanism offormation of the earth’s crust is considered, represented by two geodynamicstages opposite in direction. One of them, which is primary, isdescribed as rift-spreading. In it, using modern developments and analysisof many years of factual material, the scientific provisions of theformation of the earth’s crust in the region, characterizing the geologicalconditions of extension in the pre-Paleozoic period, are substantiated.The second one, provided with the compression mode, presents the basisof the theory called the thrust-shock theory. The patterns in the developmentof fundamental geological processes are the following: magmaformation, metamorphization, sedimentation, folding and faulting, geodynamicsand tectonics, oil and gas accumulation, which formed themain essence of the general theory of the formation of the earth’s crustof the continent. It is based on: the fundamental doctrine of modernmobilism; the crust-forming role of thrusting and thrusting processes;availability of tectonics and geodynamics; assessment of the oil and gaspotential of the pre-Paleozoic of Bashkiria. It is shown that the junctionof the northeastern zone of the Bashkir uplift with the Archean-Proterozoic Taratash complex, known as the remnant of the ancientbasement of the platform, is accompanied by structural features andestimated prospects for the distribution of minerals. According to N.P.Kheraskova: outcrops of the Taratash structure show that at the base ofthe Ural structure lies a complex of highly metamorphosed rocks,largely consisting of gneisses and granites. The formation of such acomplex indicates a particularly important stage in the tectonic developmentof the Urals, a stage during which the earth’s crust was characterizedby high permeability and low geothermal gradients.