DEEP STRUCTURE OF THE UKRAINIAN SHIELD PLUTONS ON THE BASIS OF SEISMIC DATA

Abstract

Results are presented of reinterpretation of data from the deep seismic sounding profiles XXIV and XXX, geotraverse II and wide-angle reflection profiles XIII and XIV, located in the region of Korsun'-Novomyrgorod and Korosten' plutons of the Ukrainian Shield (USH). Detail studies of velocity characteristics and deep seismic sections of the Earth's crust of these structures were carried out. As a result of analysis and generalization of data obtained, similarities and differences of the plutons were recognized, and their depths were determined more precisely. The plutons are featured by moderate crustal thickness (41.0-41.7 km). Compared to the normal crustal velocities of the Precambrian shields, the Earth's crust of the plutons shows higher ones, especially in its upper part. Conclusion about the character of intrusions within the considered structures has been drawn. Within the Korsun'-Novomyrgorod pluton non-stratified (massive) intrusion is marked, while in the Korosten' pluton somewhat deeper intrusions with alternating high-and low-velocity layers are present.