Granite-free area in Black Sea trough, from seismic data

Abstract

Absence of granite in the crust under the central part of the Black Sea depression is confirined by the two methods. The sediments are underlain by basalt; granite is detectable only on the depression's periphery. Boundaries of the granite-free zone are clearly defined in the north and east of the sea; so far, no deep seismic sounding has been conducted in the west (fig. 5) where the wedging-Out of granite, toward the center of the depression, outside the competence of unaided seismological analysis, has been indicated on geomorphological premises (fig. 1).--V.P.Sokoloff.