Uranium-Lead Isotopic Geochronology of Berdychiv Type Granitoids of the Bug Area (the Ukrainian Shield)

UDC 550.93 (477)

https://doi.org/10.15407/mineraljournal.37.03.051

L.M. Stepanyuk (1), O.M. Ponomarenko (1), K.V. Petrichenko (1), S.I. Kurilo (1), T.I. Dovbush (1), S.A. Sergeev (2), N.B. Rodionov (2)

(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: stepanyuk@igmof.gov.ua; pan@igmof.gov.ua; kurylo.sergiy@yandex.ru

(2) Federal State Unitary Enterprise "A.P. Karpinsky Russian Geological Research Institute", Center of Isotopic Researches

74, Sredny Ave., Vasilevskiy Island, Saint Petersburg, Russia, 199106

E-mail: sergey-sergeev@vsegei.ru; nicolay-rodionov@vsegei.ru

Uranium-Lead Isotopic Geochronology of Berdychiv Type Granitoids of the Bug Area (the Ukrainian Shield)

Language: Ukrainian

Mineralogical journal 2015, 37 (3): 51-66

Abstract: Berdychiv type granitoids are known under different titles in Ukrainian publications: Berdychiv, Chudnovo-Berdychiv granites, biotite-garnet granitoids or biotite-garnet blastites. They are most widespread in interstream area of Teteteriv — South Bug — Sluch Rivers, where they associate with biotite-garnet migmatites and biotite-garnet gneisses related to Berezninska strata of Dniester-Bug series. Granitoids distributed in Zhezheliv open pit situated on the right coast of Gnylopiat River, to the south of Berdychiv are treated as their lithotype. Multimineral association including biotite, cordierite, plagioclase, potassic feldspar (usually orthoclase), quartz and ilmenite is typical of Berdychiv granites. The formation age of Berdychiv type granitoids was determined by classical uranium-lead method on monazite at the Department of Radiogeochronology of IGMOF of NAS of Ukraine and by ion-ionic microprobe Shrіmp-ІІ on zircon in the Center of Isotopic Researches VSEGEI (St. Petersburg). Granitoids are sampled in Zhezheliv and Ivaniv open pits. Monazites selected from leucosome of Zhezheliv open pit granitoids show the age of 2040.9 ± 2.6 million years. For monazites from granitoids of Ivaniv open pit considerable discordance in digital age values (on 207Pb/206Pb ratio) ranging from 2042 to 2020 million years has been established. This fact can be caused by either several separated in time events or by a single granite formation event with prolonged manifestation in time. Dating by ion-ionic microprobe methods carried out on zircon coating from "granite" of the Zhezheliv open pit yields an age of 2041.9 ± 6.3 million years, the age values similar to dating results on coatings of zircons from leucosome — 2043.5 ± 5.8 have million years. It completely coincides with age dating obtained on monazites. For coatings on zircon from the Ivaniv open pit granitoids two values of isotopic age are obtained. One crystal, on which coating two determinations have been made, yields the age of 2001 ± 12 million years. For coatings from other four crystals the age dating of 2076.9 ± 7.8 million years have been obtained. Thus, both uranium-lead isotopic system of monazites and dating of coating of zircon crystals from "granite" of the Ivaniv open pit testify to several stages of granite formation. For relic cores of clastogene zircon from the Zhezheliv open pit "granite" the subconcordant and concordant dating are received, which values (by ratio 207Pb/206Pb) range from 2081 to 2331 million years. Relic cores of clastogene zircon from "granite" of the Ivaniv open pit are also characterized by subconcordant and concordant dating, but as a whole they are more young in age (by ratio 207Pb/206Pb) with age values ranging from 2043 to 2165 million years. The most young core (2043 million years) found in zircon crystal show the youngest (2001 ± 12 million years) age of its coating. These, young enough, Paleo-Proterozoic ages of relic clastogene cores of zircon crystals collected from Berdychiv granitoids show good correlation with the earlier samarium-neodymium isotopic modeling dating obtained on gneisses of Berezninska strata and Berdychiv granitoids. This fact can testify to Paleoproterozoic (no older than 2.10 billion years) age of Berezninska strata.

Keywords: Ukrainian Shield, radiogeochronology, granite of Berdychiv, zircon, monazite.

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