Stepaniuk L.M., Dovbush T.Y., Kurylo S.Y., Lesnaya Y.M., Petrychenko K.V.
M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the National Academy of Sciences of Ukraine
Language: Ukrainian
Geochemistry and ore formation 2016, 36: 72-81
https://doi.org/10.15407/gof.2016.36.072
In Dniester-Bug megablok was allocated several granitoid complexes – Haivoronskyy Litinskiy , Pobuzke, Berdichevsky and they characterize the individual stages of granitoid magmatism. The vein body which are represented mainly by aplite, aplyt-pehmatite, biotite-two-feldspar granites and their pyroxene containing types such as – antipertyte enderbites and charnockites which were form in the final stage of granite magmatism manifestation. The age (by zircon and monacite) of vein grani- tiods, which are widespread in the basin of Pivdenyy Bug rivers (Middle and Higher Pobug) have been defined by isotope uranium-lead method. It was founded that vein granites in the Dniester-Bug megablock were formed over 100 Ma (2.06–1.96 Ga). More ancient vein granites are represented by pyroxene types and the younger granit rocks is aplite. Overall, the vein granites with similar P-T conditions of formation parameters are asynchronous formations in different blocks of Pobuzhya. Anatektic melting of enderbites near the village of Zavallya were crystallized 1992,7 ± 2,1 Ma, charnockites vein of Litinskiy career – 2033.7 ± 2.3 Ma, and plahiocharnockites of Gayvoronsky career – 2035.1 ± 3.2 Ma. Even more age range granite formation with amphibolite facies paragenesis – 2040,9 ± 2,6 Ma is leykosoma from the granites of Berdichev type (Zhezhelivskyy quarry). The same age (2039.7 ± 0.5 Ma) has biotite granite of Chausivskyy career. Granitoids which are formed by supracrystal rocks of Bug series (1.98 Ga) is somewhat younger. And the the youngest granite rocks is aplite (1960.9 ± 3.6 Ma) of Holovchynskyy career. Granites of vein facies within the Dniester-Bug megablock, are not insignificantly separated in time from the formation of the bulk of granites and migmatites, of which they are distributed.
Key words: Ukrainian Shield, Dniester-Bug megablok, granite, U-Pb dating.
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