REGIONAL METAMORPHISM AND STRATIGRAPHY OF THE BASEMENT OF THE UKRAINIAN SHIELD

Stratigraphic complexes of the Lower Precambrian are everywhere metamorphosed. Therefore, stratigraphic subdivision has always been inextricably linked with study metamorphism. For some time, degree metamorphism was even used as an indication their relative age. With beginning use isotopic dating, this sign not confirmed, after which no longer taken into account in dismemberment shields basement. The for a long time when compiling official schemes Ukrainian Shield, which, opinion many geologists, led to distortions real stratigraphy basement region. authors article believe that can still be development Shield and, above all, individual megablocks. possibility such is considered cycle publications. This second cycle. first describes and all megablocks Shield. A number conclusions have made about regularities manifestation It shown older stratigenic each characterized by higher temperature pattern provides basis establishing sequence within based on At same distinctive features composition complexes, according authors, reflection successive stages geological Early serve regional scheme historical basis. In cycle, modern approaches geochronological periodization considered: a) geochronometric, adopted International “The Geological Time Scale” b) historical-geological, “General Scale Russia”. current “Correlation Chronostratigraphic Scheme Shield” geochronometric approach, like other researchers, consider unacceptable practical use. proposes variant historicalgeological basis, compiled at level final version divided series suites.