ABOUT THE STRUCTURE OF THE BLACK SEA BASIN AS A HIERARCHICAL SYSTEM OF MEGAPULL-APART

Abstract

The article presents the geological and structural argumentation of the morphogenesis of the hollows and troughs of the Black Sea as multi-rank pull-apart areas of the intersection of trans-regional NW and ENE tectonic lineaments.The ensemble of geostructures of the Black Sea (deep-water depressions, fault zones, peripheral troughs and uplifts) seems to be derived from substantially shear deformations and low-amplitude dislocations of the zones of transregional and transcontinental lineaments. Structural patterns, known for models оf the simple shear, were also revealed in the zones of dynamic influence of faults, limiting depressions. Their structural positions are shown against the background of the intersection of fault zones NW and NE lineament systems, as regional elements of the reghmatic global network. An analysis of the hierarchy of the structures of the fault-block plan of the Black Sea basin reveals morphogenetic analogies for depressions and troughs with (mega)pull-apart structures and models. The structural features of the (mega)pull-apart deep-sea basins of the Black Sea and the position of second-rank structures, peripheral troughs (and shafts) of the water area indirectly express the “pilot” and controlling effect of reghmagenesis in the “frame” of intersecting northwestern and northeastern zones of tectonic lineaments and their transcurrent deep faults-shifts in the transtensia mode. (At)shear positions of fault-block structures of the basin, local geological bodies, areas of volcanic-plutonites, “products” of tectono-magmatic activations, reveal the regular regulatory action of rotational factors of substantially shear low-amplitude tectonics of the earth's crust, as well as the important role of zonal criteria for hydrocarbon zones and areas with tectonophysically defined tensile conditions.