AGE OF ZIRCONS FROM CHARNOKITOIDS OF THE PERVOMAYSK DEEP STRUCTURE OF THE HOLOVANIVSK SUTURE ZONE

Charnokytoids of the Pervomaysk deep structure were formed on the primary crustal rocks, which probably constitute the lower structural floor of the Golovaniv suture zone (foundation). They were formed in the course of tectonic-metamorphic events, of which two events can be confidently established by isotopic methods: 2.8 ± 0.1 billion years - granulite metamorphism, as a result of which the primary crustal rocks take the form of enderbite- gneisses, as a rule, with two pyroxenes, and 2.0±0.1 billion years ago - repeated metamorphism and granitization.