Неотектоника и геодинамика зоны сочленения Северо-Западного Кавказа и Черноморской впадины (район г. Геленджика)

Abstract

Relevance of the work. In the junction zone of the neotectonic structures of the North-West Caucasus and the Black Sea depression, structures of different types in strike and morphological-kinematic type are developed. Determining the structural-geomorphological and neotectonic zoning, including modern ones, and its connection with the sources of tectonic forces and stresses is relevant. Such studies are necessary to ensure the geodynamic safety of engineering structures in the city of Gelendzhik, the territory of which is subject to negative geological processes. The purpose of the research is to identify the structural-geomorphological, neotectonic modern zoning with an assessment of the modern geodynamic conditions of its formation in connection with ensuring the safety of engineering drainage routes in the Gelendzhik region. The research method is structural-geomorphological, with the construction of profiles and geomorphological steps with an assessment of their age and deformations. The work used neotectonic and structural-geodynamic approaches aimed at identifying structures and identifying the sources of stress and deformation fields. The research methodology is the recognition of heterogeneity, different ranks and different ages of stresses and deformations. As a result of the work, erosion-denudation stages of different ages and marine terrace levels and neotectonic structures were identified with an assessment of modern geodynamic conditions. For the first time, a cross-structural plan has been established, in which all-Ural and anti-Caucasian structures intersect. Their origin is associated with the superposition of heterogeneous forces and stresses. Compression stress is generated in connection with collision processes of lithospheric plates and microplates (blocks), tension is generated in connection with the activity of the deep East Black Sea geodynamic system. It considers as a mechanism the upper mantle convection directed from the Black Sea depression towards the orogen of the North-Eastern Caucasus. The superposition of faults of different ages and different types on top of each other causes increased activity in them. Late orogenic faults, consistent with early Alpine (early orogenic) reverse faults, are characterized by increased displacement amplitudes and wide dislocation zones. It is dangerous for engineering routes to cross such gaps. The pipeline at the intersection with the zone of active ruptures will be equipped with special hinge-type devices to prevent dangerous deformations in it.