Geophysical Journal | 2016 volume 38 4

Velocity divisibility of the mantle beneath the Ukrainian Shield

© T.A. Tsvetkova, I.V. Bugaenko, L.N. Zaets, 2016

Within the limits of three-dimensional Tailor approximation P-velocity model of the mantle under the Ukrainian shield it has been shown that the mantle under it, according to its velocity characteristics, can be subdivided into 3 domains: the Western, the Central and the Eastern ones. The Volynian and Podolian mega-blocks belong to the Western domain, the Central domain includes the Ross, the Bug, the Ingul mega-blocks and the western part of the Middle-Dnieper mega-block limited by the Derezovata fault system and the Eastern domain includes the eastern part of Middle-Dnieper mega-block and the Peri-Azovian mega-block. This division remains for the interval 50-500 km of the upper mantle, its transitional zone, and restores at the depths 700-800 km of the splitting zone 1. The mentioned division is substantiated by the connection at the depth of 100-250 km of the mantle under the Ukrainian Shield with velocity structures of the Sarmatian segment of East European Platform; at the depths of 350-600 km by the connection with velocity structures of the mantle under the Black Sea; at the depths of 700-800 km the connection of velocity structures of the Sarmatian segment of East European Platform and the western part of the Black Sea restores.

Key words: seismotomography, P-velocity model, the mantle, the Ukrainian shield.

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