RADIOGEOCHRONOLOGY OF SUTURE ZONE OF THE DNIESTER-BUG AND ROS'-TIKYCH MEGABLOCKS. ARTICLE 2. GEOCHRONOLOGY OF ROCK COMPLEXES OF THE DNIESTER-BUG MEGABLOCK

UDC 550.93 (477)

https://doi.org/10.15407/mineraljournal.38.04.045

O.V. Ziultsle (1), L.M. Stepanyuk (1), V.V. Ziultsle (2), T.I. Dovbush (1), S.I. Kurylo (1)
(1) M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine
34, Acad. Palladin Av., Kyiv-142, Ukraine, 03680
E-mail: olegzjults@gmail.com; stepaniuk@nas.gov.ua;
kurylo.sergiy@yandex.ru
(2) Geological Expedition Right-Bank State Enterprise "Ukrainian Geological Company"
1-а, Soviet Str., Fursy vil., Belotserkovsky district,
Kyiv region, Ukraine, 09
RADIOGEOCHRONOLOGY OF SUTURE ZONE OF THE DNIESTER-BUG AND ROS'-TIKYCH MEGABLOCKS. ARTICLE 2. GEOCHRONOLOGY OF ROCK COMPLEXES OF THE DNIESTER-BUG MEGABLOCK
Language:
Ukrainian
Mineralogical journal 2016, 38 (4): 45-53

Abstract: This article is a continuation of Article 1 (Mineral. Journ. (Ukraine), Vol. 38, No 1, pp. 84—95), which presents the results of the study of accessory minerals from the rocks that form the structural and substantial complexes of the Ros’-Tikych megablock in the area of suture zone with the northern part of the Dniester-Bug megablock. Article 2 shows the results of determination of the age of zircons and monazites. The U-Pb isotopic method was used to date zircons and monazites sampled from the aluminous metamorphic and ultra-metamorphic rocks of the Dniester-Bug megablock within the northern part of the Dniester-Bug and Ros’-Tikych megablock suture zone. It was found that the isotopic age of zircons and monazites is 2.04—2.1 billion years. Maximum values of zircons age were obtained for the nuclear parts of their zonal grains. Given the fact that the appearance of monazite in the mineral parageneses of these rocks is associated with the kalifeldspatization processes at the final stage of formation, the determined age of zircon and monazite age reflects the milestone of this phase. At the same time, the close association of aluminous rocks of the Dniester-Bug megablock charnockite of the Archean age and the nature of their relationship with the entities of diaphthoresis granulite infrastructure of the Ros’-Tikych megablock evidence for the Archaean age of the initial phase of formation of the aforementioned rocks.

Keywords: zircon, monazite, isotopic age, megablock, infrastructure, structural-material complex.

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