Three-dimensional gravity model of the Earth's crust and upper mantle
of the Dnieper-Donets depression and the Donbas
© Kuprienko P.Ya., Makarenko I.B., Starostenko V.I., Legostaeva O.V., Savchenko A.S.
Three-dimensional gravity model of the Dnieper-Donets depression and the Donbas has been constructed applying new seismic data along DSS profiles, the DOBRE profile and petrophysics data that gave a possibility to obtain new information on gravity distribution within the volume of the Earth's crust. The areas of distribution and the thickness of crust-mantle mixture have been determined as well as the presence of axial consolidation, which decreases from the central and near-margin zones to the margins of depression, and in the Donbas - to the periphery. The thicknesses of the Earth's crust layers have been calculated: "granite", "diorite", "basalt" based on three-dimensional gravity model, which ratio to the general thickness of the Earth's crust made possible to predict material composition of the Earth's crust of the DDD and the Donbas (6 types of the crust have been distinguished). Basalt-diorite type of the crust is located in a transitional area from the DDD to the Donbas. In near-margin areas, according to residual gravity effect, anomalously deconsolidated areas in sedimentary cover have been delineated, which have connection with deep heterogeneities, which can be traced in the density model along the whole section of the crystalline part of the crust as deconsolidated areas of different size. Maximal deconsolidation in sedimentary cover belongs to the deposits of Lower Carboniferous. Correlation between deconsolidated areas and oil, oil-gas and gas areas for the deposits of the DDD and the Donbas has been found.