Reflection in the gravitational field of the geodynamic impact of the Urals on the salt strata of the Pre-Ural trough

Abstract

Research subject. The Verkhnekamskoye potash salt deposit located in the Pre-Ural trough, deformation structures inside the salt rock mass associated with the influence of the Ural orogen.Materials and methods. A complex interpretation of gravimetric and geological data, including those obtained via well drilling, was carried out. The materials obtained during the processing of gravimetric data in the VECTOR system were used. Based on the relationship between gravity anomalies and density differentiation, the shape and size of the studied objects, as well as their mutual position, were characterized. Results. The use of modern processing and interpretation methods of gravimetric data allowed us to detect dislocations of different kinematics formed under the influence of a force field originated from the collision structure of the Urals. In the course of tectonic processes in the geodynamic environment of horizontal compression, post-sedimentation structures were formed inside the salt strata, which complicate the internal structure of the salt-bearing formation. Possessing high plasticity and low strength properties, the salt formation represents an autonomous geodynamic system in the force field of the PreUral deflection, where mechanical stresses arising under the influence of the Ural collision zone were implemented as deformation structures. The results of the tectonic evolution of the salts are steadily revealed by anomalies in the gravitational field.Conclusion. Using the gravimetric method, we identified structures inside the salt rock mass under study, which were produced under the dynamic action of the Urals as a response of the geological environment to the force filed.