RADIOGEOCHRONOLOGY OF SUTURE ZONE OF DNIESTER-BUG AND ROS'-TIKYCH MEGABLOCKS. ARTICLE 1. GEOCHRONOLOGY OF ROCK COMPLEXES OF ROS'-TIKYCH MEGABLOCK

UDC 550.93 (477)
https://doi.org/10.15407/mineraljournal.38.01.084
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. Palladina Pr., Kyiv-142, Ukraine, 03680 
E-mail: olegzjults@gmail.com; stepanyik@nas.gov.ua; kurylo.sergiy@yandex.ru
2 Geological Expedition Right-Bank State Enterprise "Ukrainian Geological Company"
1а, Soviet Str., Fursy vil., Belotserkovsky district, Kyiv region, Ukraine, 09150
E-mail: furgeol@mail.ru
RADIOGEOCHRONOLOGY OF SUTURE ZONE OF DNIESTER-BUG AND ROS'-TIKYCH MEGABLOCKS. ARTICLE 1. GEOCHRONOLOGY OF ROCK COMPLEXES OF ROS'-TIKYCH MEGABLOCK
Language: Ukrainian
Mineralogical Journal 2016, 38 (1): 84-95
Abstract: Peculiarity of Dniester-Bug and Ros'-Tikych megablock suture zone northern part consists in the boundary irregular configuration of structural and substantial complexes (SSC) of these megablocks. In fact, the boundary is the contact of Berdychiv and Zvenygorod complex plagiogranitoids. Berdychiv complex granitoids include the Lityn complex charnockitoids and the residuals of Ros'-Tikych series metamorphic rocks. Zvenygorod complex granitoids include the Tetiiv complex diorite-like rocks and metamorphic rock residuals which until recently were referred mainly to Ros'-Tikych series or rarely to Volodarka-Bila Tserkva stratum. However, survey of petrographical, petrochemical and geochemical properties of amphibolites, amphibolic crystalline schists and plagiogneisses, which within the Ros'-Tikych megablock north-west part lay among the ultra-metamorphic formations of Tetiiv and Zvenygorod complexes, prove that according to mentioned above attributes they virtually do not differ from the rocks which have the same composition and which without doubts represent the diaphthorite pyroxene crystalline schists and the plagiogneisses of Dniester-Bug series, which were detected in the Dniester-Bug megablock north-east part. Thus, Ros'-Tikych megablock is not, as it was conventionally considered, the structural-facies composed exclusively of SSC formed under the amphibolites facies. U-Pb isotopic method was used to date zircons and monazites sampled from the metamorphic and ultra-metamorphic rocks of Ros'-Tikych megablock within the northern part of 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. On base of assumption that the monazites occurrence in the mineral paragenesis of these rocks is connected with their kalifeldsparization at the final stage of formation, the monazites determined age reflects the kalifeldsparization processes development. These processes are synchronous with formation of Dniester-Bug megablock structural and substantial complexes and connected with the wide occurrence, within the Ros'-Tikych megablock, of palingenic and metasomatic processes which stipulate diaphthoresis of the megablock Archaean infrastructure and occurrence of feldspathic hydride "polmigmatite" and plagioclase-tartan-pattern granitoids.
Keywords: zircon, monazite, isotopic age, megablock, infrastructure, structural and substantial complex.
Referenses
1.    Bezvinniy, V.P. (2002), Visn. Kyiv Univ., Geology, Kyiv, Ukraine, No 21-22, pp. 39-41.
2.    Bezvynny`j,V.P., Cyba, M.M., Donecz`, G.A., Borisenko, T.S., Skobels`ka, A.K., Mokіjez, V.O., Oxin`ko, Z.P. and Lyashenko, P.O. (2006), State geological map of Ukraine. The Central Ukrainian series. Sheets M-36-XIX (Bila Tserkva), M-36-XXV (Uman)/composition, 1 : 200 000, Geoinform, Kyiv, 164 p. 
3.    Zjul’cle, V.V., Dorkovs’ka, Z.M., Vihodcev, M.K., Bondarenko, V.V., Grebneva, G.G., Kulik, S.M., Kostjuchenko, V.S., Bevza, D.T., Sіnkevich, G.S. and Nіkіtash, L.P. (2005), State geological map of Ukraine. Sheet M-35-XXIV (Skvyra). Central Ukrainian series / composition, 1 200 000, Geoinform, Kyiv, 135 p. 
4.    Zyul`czle, O.V. and Zyul`czle, V.V. (2014), Zb. nauk. prac’ UkrDGRI, Kyiv, Ukraine, No 3-4, pp. 191-204. 
5.    Kiriljuk, V.P. (1982), Geol. Journ., Kyiv, Ukraine, Vol. 42 No 4, pp. 30-41. 
6.    Kiriljuk, V.P., Sivoronov, А.О. and Yatsenko, G.М. (1974), Dop. АN URSR. Ser. B, Kyiv, Ukraine, No 7, pp. 586-588.
7.    Lysak, A.M. and Pashchenko, V.G. (1981), Theory and practice of information studies lower precambrian, Vyscha shkola, L`viv.
8.    Ponomarenko, O.M., Lesnaja, I.M., Zjul’cle, O.V., Gatsenko, V.A. Dovbush, T.I., Kanunikova, L.I. and Shumlyanskyy, L.V. (2010), Geohimija ta rudoutvorennja, Kyiv, Ukraine, No 28, pp. 11-16. 
9.    Stepanyuk, L.М. (1998), Mineral. Journ. (Ukraine), Kyiv, Vol. 20 No 2. pp. 68-73. 
10.    Shcherbak, M.P., Artemenko, G.V., Lesnaja, I.M. and Ponomarenko, O.M. (2005), Geochronology of the Early Precambrian Ukrainian Shield. Archaea, Naukova dumka, Kiev, 241 р. 
11.    Shcherbak, M.P. and Bartnizkiy, Е.N. (1995), Geohimija ta rudoutvorennja, Kyiv, Ukraine, No 21, pp. 3-24. 
12.    Shcherbakov, I.B. (2005), Petrology of the Ukrainian shield, ZUKC, Lviv, 366 p. 
13.    Yaroshchuk, M.A. (1983), Iron formation Belotserkovsko-Odesskaya metallogenic zone, Nauk. dumka, Kiev, 224 p. 
 

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