Abstract
For the first time, geochronological studies of zircon and monazite quartz syenites of the Nizyanka massif in the northern part of the Lozovatka anticline of the West Azov region (Lypovenki area) were performed. They break through the metamorphic rocks of the Kayinkulak and Upper Tokmak strata of the West Azov series and the later intrusions of diabases. «Relic cores» and later thin shells are observed in zircon from quartz syenites. Considering that quartz syenite did not undergo imposed endogenous processes, it was the shells in zircon crystals that crystallized during their formation. The U-Pb age of the relict zircon is 2858±51 Ma. Monazite is synpetrogenic for quartz syenites and was probably formed simultaneously with thin shells of zircon. The U-Pb age of monazite is 2065.5±7.2 Ma. According to the obtained data, quartz syenites were melted from Archean rocks in a crustal magmatic source in the Paleoproterozoic at the stage of the general collision of the Archean crust of the Ukrainian Shield and the Volga-Ural continents.
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