ВІКОВІ МЕЖІ (3,2 - 3,0 МЛРД РОКІВ) ФОРМУВАННЯ ТА ГЕНЕЗИСУ КИСЛИХ ВУЛКАНІТІВ І ІНТРУЗІЙ ТТГ В СОРОКИНСЬКІЙ І БЕРЕСТІВСЬКІЙ ЗЕЛЕНОКАМ’ЯНИХ СТРУКТУРАХ ПРИАЗОВ’Я

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.