AGE LIMITS (3.2 - 3.0 BILLION YEARS) OF THE FORMATION AND GENESIS OF ACID VOLCANITES AND TSH INTRUSIONS IN THE SOROKINA AND BERESTIV GREENSTONE STRUCTURES OF THE PRIAZOV REGION

It has been defined that felsic volcanic rocks and TTG intrusions of the Mesoarchean granite-greenstone association in the Soroky and Berestove greenstone structures of the Azov Domain of the Ukrainian Shield were formed between 3.2 and 3.0 Ga. The U-Pb age of zircon from metariolites of the Soroky greenstone structure is 3182 ± 21 Ma (TNd (DM) = 3.4 Ga). They were likely generated in a crustal magmatic source from an older crust. U-Pb age of zircon from intrusions of TTG of the area is 3,12-3.0 Ga. Zircon from trondhjemite of the TTG series from the tectonic lens among the metasedimentary rocks of the Kruta Balka Formation in the Soroky structure was dated at 3224 ± 37. Felsic magmatic rocks were melted out from both crustal and juvenile magmatic sources, indicating the formation of greenstone structures in the Azov Domain on the older continental crust.