FEATURES OF THE DEEP STRUCTURE AND SYNRIFT GEODYNAMICS OF THE PRIPYAT AND DNIEPR SEGMENTS OF THE EARTH CRUST

Decoding the seismic-velocity structure of the earth crust and the upper mantle on the basis of deep seismic sounding according to the Georift-2013 program along the Pripyat and Dnieper troughs along the Nesvizh-Bragin-ChernigovPoltava profile allows one to develop the ideas about the structure and Hercynian synriftic geodynamics of the contiguous adjacent structures of the Pripyat-Dnieper-Donets aulacogene. The abnormally powerful regional high-speed body, which is interpreted as a rift pillow, established in the lower crust under the Dnieper graben, is one of the indicators of manifestation of active plume tectonics in the process of Hercynian rifting in this segment of the aulacogen PDD. In the Pripyat segment, separated from the Dnieper segment by echeloned deep structures in the zone of the Bragin-Loevsky saddle, the structure of the crust– mantle boundary differs in comparison with the Dnieper segment by a lower level of the Moho surface; it is subhorizontal in the cross sections of the Pripyat paleorift. There were no active plume-tectonic events in scale.

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