U-Pb AGE OF ZIRCONS FROM HYPERSTHENE-PLAGIOCLASE GNEISS THE VALLEY OF THE ZKHAR RIVER (THE UPPER BUG REGION, UKRAINIAN SHIELD)

UDC 550.93

https://doi.org/10.15407/mineraljournal.39.03.067

L.M. Stepanyuk, L.V. Shumlyanskyy

M.P. Semenenko Institute of Geochemistry, Mineralogy

and Ore Formation of the NAS of Ukraine

34, Acad. Palladin Ave., Kyiv, Ukraine, 03142

E-mail: stepaniuk@nas.gov.ua, lshumlyanskyy@yahoo.com

U-Pb AGE OF ZIRCONS FROM HYPERSTHENE-PLAGIOCLASE GNEISS THE VALLEY OF THE ZKHAR RIVER (THE UPPER BUG REGION, UKRAINIAN SHIELD)

Language: Ukrainian

Mineralogical journal 2017, 39 (3): 67-74

Abstract: The geological section that crops out in the valley of the Zkhar River near Horodishche and Novoselytsya villages is represented by an association of hypersthene-plagioclase gneisses and crystalline schists. This section is considered as one of the stratotype sections of the enderbite-gneissic formation of the Tyvriv stratum of the Palaeoarchaean Dniester-Bug series. The Eoarchaean isotope ages (3.65 Ga) were obtained for the enderbitic gneisses (hypersthene-plagioclase gneisses) that occur near Zavallya village (Middle Bug area). However, the relict cores in zircons from the Berdychiv granites that developed after metamorphic rocks of the Berezninska stratum which belongs to the Palaeoarchaean Dniester-Bug series, have yielded solely Palaeoproterozoic ages. The age of the hypersthene-plagioclase gneiss which together with thin interlayers of mafic crystalline schist crops out on the left bank of the Zkhar River downstream of the Horodishche village was defined by the U-Pb isotope dating of various spots in zircons employing the LA-ICP-MS method. Zircons occur as light-pink to grey-pink, prismatic to short-prismatic and almost equant crystals with smooth shiny surface and rounded outlines. Crystals have complex internal structure which is determined by the presence of variable inherited cores and newly-formed mantles. There are several types of the cores. The most common cores occur as fragments of zircon crystal with fine concentric igneous zoning. Equant or almost equant cores with angular outlines are also quite common. Complex cores and cores with regular outlines are rare. Almost all of the analyzed spots have yielded concordant ages which vary from 2145 to 2022 Ma (207Pb/206Pb ages) and from 2152 to 2030 Ma (206Pb/238U) ages. Mantles have yielded an age of 2036 ± 10 Ma. This age corresponds to the age of monazite from charnockites of the Lityn quarry.

Keywords: hypersthene-plagioclase gneiss, isotope age, zircon, Tyvriv stratum, Palaeoproterozoic.

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English