Abstract
Recently completed investigations of the crustal structure on ancient shields of the East European platform carried out with the method of “deep seismic sounding” (D.S.S.) have drastically changed the previous notions about the deep structure of shields in general. In the upper crust, in the so-called “granitic” layer, complex anticlinal and synclinal structures as well as numerous faults, thrusts, etc., have been identified. A flattening of steeply dipping seismic interfaces with depth is observed. The crustal thickness in different tectonic zones ranges from 30 to 60 km. It is shown that the M-structure correlates with the sub-surface tectonics in the Ukrainian Shield.
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