O.V. Kovtun, AGE OF GRANITES OF THE KROPYVNYTSKO-BOBRYNETSKY MASSIF (INGUL MEGABLOCK OF THE UKRAINIAN SHIELD)
https://doi.org/10.15407/mineraljournal.47.03.069
UDC 550.93
AGE OF GRANITES OF THE KROPYVNYTSKO-BOBRYNETSKY MASSIF
(INGUL MEGABLOCK OF THE UKRAINIAN SHIELD)
O.V. Kovtun, Postgraduate
E-mail: kovtun85@ukr.net; orcid: 0000-0003-0475-8778
L.M. Stepanyuk, DrSc (Geology), Corresp. Member of NAS of Ukraine, Prof., Deputy Director
E-mail: stepaniuk@nas.gov.ua; orcid: 0000-0001-5591-5169
O.B. Vysotsky, PhD (Geology), Research Fellow
E-mail: alek.vysotsky@gmail.com; orcid: 0000-0002-3542-4685
A.N. Baran, PhD (Geology), Research Fellow
E-mail: baranandrew9@gmail.com; orcid: 0000-0002-5326-8014
T.I. Dovbush, Researcher Fellow
E-mail: tetyana.dovbush1@gmail.com; orcid: 0000-0002-3512-3313
M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine
34, Acad. Palladin Ave., Kyiv, Ukraine, 03142
Language: Ukrainian
Mineralogical journal 2025, 47 (3): 69-79
Abstract: The uranium-lead isotope systems of accessory monazites from porphyry-like and pegmatoid granites of the Kropyvnytsko-Bobrynets massif (Ingul megablock), which were opened by the Zhyvanivka quarry, located on the left bank of the Sugokleya River, southwest of the village of Zhyvanivka, were studied. For isotopic dating, multigrain monazite samples were taken manually under a binocular, and then the monofraction was separated by size by rolling on an inclined plane. The preparations with monofractions of monazite and zircon crystals, as well as polished grinds of porphyry-like and pegmatoid granites, were studied by optical microscopy. The results of the study of the mineral composition, petrographic and structural-textural features of granites are presented. The time of formation of the granites (2032-2036 Ma) exposed by the Zhyvanivsky quarry fits fully into the age interval of the formation of the Kropyvnytsky complex (2040-2020 Ma) of the Ingul megablock of the Ukrainian Shield in general and the granites of the Kropyvnytsky massif in particular.
Keywords: uranium-lead isotope method, monazite, Ingul megablock, geochronology.
References / Література
Bartnytskyy, E.N., Bibikova, E.V., Verkhoglyad, V.M., Legkova, G.V., Skobelev, V.M. and Terets, G.Ya. (1995), Geochemistry and ore formation, Iss. 21, Kyiv, pp. 164-167 [in Russian].
[Бартницкий, Е.Н., Бибикова, Е.В., Верхогляд, В.М., Легкова, Г.В., Скобелев, В.М., Терец, Г.Я. (1995), Геохимия и рудообразование. Вып. 21. С. 164—167.]
Dovbush, T.I., Skobelev, V.M. and Stepanyuk, L.M. (2008), Methodological recommendations for uranium-lead, rubidium-strontium and samarium-neodymium isotopic dating of geological objects at the GRR, UkrDGRI, Kyiv, 77 p. [in Ukrainian].
[Довбуш, Т.І., Скобелєв, В.М., Степанюк, Л.М. (2008), Методичні рекомендації з уран-свинцевого, рубідій-стронцієвого та самарій-неодимового ізотопного датування геологічних об’єктів при ГРР. Київ: УкрДГРІ. 77 с.]
Krough, T.E. (1973), Geochim. et Cosmochim. Acta., Vol. 37, No. 3, pp. 485-494. https://doi.org/10.1016/0016-7037(73)90213-5
Ludwig, K.R. (1989), Pb Dat for MS-DOS, version 1.06. U.S. Geol. Survey Open-File Rept., No. 88-542, p. 40.
Ludwig, K.R. (1990), ISOPLOT for MS-DOS, version 2. U.S. Geol. Survey Open-File Rept., No. 88-557, p. 38.
(2001), State geological map of Ukraine. Scale 1:200,000. Central Ukrainian series. Sheet M-36-XXII (Kirovohrad). Explanatory note, UkrDGRI, Kyiv, 119 p. [in Ukrainian].
[(2001), Державна геологічна карта України. М-б 1 : 200 000. Центральноукраїнська серія. Аркуш М-36-ХХХІІ (Кіровоград). Поясн. зап. Київ: УкрДГРІ. 119 с.]
Stepanyuk, L.M., Konoval, N.M., Dovbush, T.I., Kovtun, O.V., Vysotsky, O.B. and Snisar, V.P. (2021), Mineral. Journ. (Ukraine), Vol. 43, No. 4, Kyiv, pp. 56-62 [in Ukrainian]. https://doi.org/10.15407/mineraljournal.43.04.056
[Степанюк, Л.М., Коновал, Н.М., Довбуш, Т.І., Ковтун, О.В., Висоцький, О.Б., Снісар, В.П. (2021), Мінерал. журн. 43, № 4. C. 56—62.]
Shcherbak, D.N., Ponomarenko, A.N. and Makarenko, I.D. (1995), Geochemistry and ore formation, Iss. 21, Kyiv, pp. 74-88 [in Russian].
[Щербак, Д.Н., Пономаренко, А.Н., Макаренко, И.Д. (1995), Геохимия и рудообразование. Вып. 21. С. 74—88.]
Shcherbakov, I.B. (2005), Petrology of the Ukrainian Shield, PH "Western Ukr. Consult. Center", Lviv, 366 p. [in Russian].
[Щербаков, И.Б. (2005), Петрология Украинского щита. Львов: Изд-во "Западн. Укр. консалт. центр", 366 с.]