I.M. Lisna, FEATURES OF THE DISTRIBUTION OF RARE-EARTH ELEMENTS IN CRУSTAL SCHISTS AND ENDERBITES IN DNIESTER-BUH MEGABLOCK
https://doi.org/10.15407/mineraljournal.46.04.112
UDC 546.65:550.42 (477.4)
FEATURES OF THE DISTRIBUTION OF RARE-EARTH ELEMENTS
IN CRУSTAL SCHISTS AND ENDERBITES IN DNIESTER-BUH MEGABLOCK
I.M. Lisna, PhD (Geology, Mineralogy), Senior Research Fellow
E-mail: Lesirmich@ukr.net; orcid: 0000-0001-7545-1752
О.М. Ponomarenko, DrSc (Geology), Academician of NAS of Ukraine, Director
E-mail: pan.igmof@gmail.com; orcid: 0000-0002-5179-6091
L.V. Somka, Researcher Fellow
E-mail: liudmylas26@gmail.com; orcid: 0000-0002-7059-2502
I.A. Shvayka, PhD (Geology), Researcher Fellow
E-mail: ishvaika@gmail.com; orcid: 0000-0001-9585-4380
K.V. Vovk, PhD (Geology), Deputy Director
E-mail: vovkkaterina90@gmail.com; orcid: 0000-0001-5076-260X
L.I. Proskurka, Junior Research Fellow
E-mail: igmrproskurko@gmail.com; orcid: 0000-0001-5760-2000
O.E. Kyshchuk, PhD Student
E-mail: olegkyshchuk@gmail.com; orcid: 0009-0009-4426-7149
V.V. Hulko, PhD
E-mail: vladimir.gulko@ukr.net; orcid: 0000-0002-6085-8346
I.D. Shvayka, Junior Researcher
E-mail: igor.d.shvayka@gmail.com; orcid: 0000-0002-1908-6639
O.O. Kovalenko, Junior Researcher
E-mail: ok.igmr@gmail.com; orcid: 0000-0002-5772-8970
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 2024, 46 (4): 112-122
Abstract: The object of studying the distribution of REE in crystal schists and enderbites of the mafic-enderbite formation of the Dniester-Buh megablock of the Ukrainian Shield. Crystal schists of basic and ultrabasic composition are found in the form of xenoliths of various sizes among enderbites. In the Chronostratigraphic scheme, crystal schists are assigned to the Paleoarchean Tivriv stratum of the Dniester-Buh series. By chemical composition, they are tholeiitic basalts with SiO2 content of 47-54%. The spectrum of REE distribution in the main crystalline schists is characterized by an unfractionated character with the absence of Eu-anomaly, which indicates the mantle depths of melt nucleation. The ratio (La/Lu)N = 1.01-3.18 corresponds to a gentle to slightly inclined REE distribution spectrum. The amount of REE is 28-79 ppm. Rocks with a similar distribution of REE in greenstone belts are assigned to the TH-1 type and are considered as such that they cannot be sources for tonalite. A similar spectrum of REE distribution probably indicates the independent existence of crystal schists and enderbites, that is, the dike character of crystal schists. Crystal schists with a higher amount of REE (125-174 ppm) are more fractionated, have small negative Eu-anomalies. They are similar to the TH-2 type, which, according to K. Condi, can be a source for tonalites. The study of zircons in the basic schists and pyroxenites suggests a later formation of mafic rocks compared to enderbite-gneisses. Petrochemical enderbits by signs, they belong to the tonalite-trondijemite-granodiorite series (TTG), they occupy the field of calcareous-alkaline rocks. Depleted in REE, with an amount of 52-100 ppm. The degree of fractionation is maximum in crustal enderbites of the Podilsk block. A characteristic feature of the distribution of REE in Pobuzhya enderbites is the presence of a positive European anomaly, which is characteristic of the lower crust as a result of the removal of granitic melts from it.
Keywords: enderbites, basic and ultrabasic crystal schists, rare-earth elements, Eu-anomaly, zircons.
References / Література
Balashov, Yu.A. (1976), Geochemistry of rare earth elements, Nauka, Moscow, 267 p. [in Russian].
[Балашов, Ю.А. (1976), Геохимия редкоземельных элементов. Наука: Москва. 267 с.]
Bibikova, E.V., Clаessоn, S., Fedotova, A.A., Stepanyuk, L.M., Shumlyanskyy, L.V., Kirnozova, T.I., Fugzan, M.M. and Ilinskyy, L.S. (2013), Geochemistry, No. 2, pp. 99-121 [in Russian]. https://doi.org/10.7868/S0016752513020039
[Бибикова, Е.В., Клаэссон, С., Федотова, А.А., Степанюк, Л.М., Шумлянский, Л.В., Кирнозова, Т.И., Фугзан, М.М., Ильинский, Л.C. (2013), Геохимия. № 2. С. 99—121.]
Condie, K. (1983), Archean greenstone belts, Transl. from Engl., Mir, Moscow, 390 p. [in Russian].
[Конди, К. (1983), Архейские зеленокаменные пояса. Пер. с англ. Москва: Мир. 390 с.]
Condie, K. (1986), Precamb. Res., Vol. 32, pp. 261-278. https://doi.org/10.1016/0301-9268(86)90032-X
Dobretsov, N.L., Sobolev, V.S., Sobolev, N.V. and Khlestov, V.V. (1974), Facies of regional high-pressure metamorphism, Nedra, Moscow, 328 p. [in Russian].
[Добрецов, Н.Л., Соболев, В.С., Соболев, Н.В., Хлестов, В.В. (1974), Фации регионального метаморфизма высоких давлений. Москва: Недра. 328 с.]
Lesnaya, I.M. (1988), Geochronology of charnockitoids of the Buh region, Nauk. dumka, Kyiv, 133 p. [in Russian].
[Лесная, И.М. (1988), Геохронология чарнокитоидов Побужья. Киев. Наук. думка. 133 с.]
Lisna, I.M., Ponomarenko, O.M., Shumlyanskyy, L.V., Larikov, A.L., Somka, L.V., Gulko, V.V. and Kovalenko, O.O. (2023), Mineral. Journ. (Ukraine), Vol. 45, No. 2, pp. 99-115 [in Ukrainian]. https://doi.org/10.15407/mineraljournal.45.02.099
[Лісна, І.М., Пономаренко, О.М., Шумлянський, Л.В., Ларіков, А.Л., Сьомка, Л.В., Гулько, В.В., Коваленко, О.О. (2023), Мінерал. журн. 45, № 2. С. 99—115.]
Moyen, J.F. and Martin, H. (2012), Lithos, Vol. 148, pp. 312-336. https://doi.org/10.1016/j.lithos.2012.06.010
Murbat, S. (1967), The nature of metamorphism, Mir, Moscow, pp. 243-278 [in Russian].
[Мурбат, С. (1967), Природа метаморфизма. Москва: Мир. С. 243—278.]
Nalivkina, E.B. (1964), Charnockitoids of the southwestern part of the Ukrainian crystalline massif and their genesis, Nedra, Moscow, 124 p. [in Russian].
[Наливкина, Э.Б. (1964), Чарнокитоиды юго-западной части Украинского кристаллического массива и их генезис. Москва: Недра. 124 с.]
Plotkina, T.E. (1994), Geochemistry and petrology of enderbite-gneisses and crystalline schists of the Khaschevato-Zavalyevsky block of the Ukrainian Shield, Abstract diss. cand. geol.-min. sci., Kyiv, 24 p. [in Russian].
[Плоткина, Т.Э. (1994), Геохимия и петрология эндербито-гнейсов и кристаллосланцев Хащевато-Завальевского блока Украинского щита: автореф. дис. … канд. геол.-мин. наук. Киев. 24 с.]
Stepanyuk, L.M. (1996), Mineral. Journ. (Ukraine), Vol. 18, No. 4, pp. 10-19 [in Russian].
[Степанюк, Л.М. (1996), Минерал. журн. 18, № 4. С. 10—19.]
Shcherbak, M.P., Artemenko, G.V., Lesnaya, I.M., Ponomarenko, O.M. and Shumlyanskyy, L.V. (2008), Geochronology of the Early Precambrian of the Ukrainian Shield. Proterozoic, Nauk. dumka, Kyiv, 238 p. [in Russian].
[Щербак, Н.П., Артеменко, Г.В., Лесная, И.М., Пономаренко, А.Н., Шумлянский, Л.В. (2008), Геохронология раннего докембрия Украинского щита. Протерозой. Киев: Наук. думка. 238 с.]
Shumlyanskyy, L.V., Wilde, S.A., Nemchin, A.A., Claesson, S., Billström, K. and Bagiński, B. (2021), Precamb. Res., Vol. 352, pp. 1-52. https://doi.org/10.1016/j.precamres.2020.106001
Taylor, S.R. and McLennan, S.M. (1988), Continental crust, its composition and evolution, Mir, Moscow, 384 p. [in Russian].
[Тейлор, С.Р., МакЛеннан, С.М. (1988), Континентальная кора, ее состав и эволюция. Москва: Мир. 384 с.]
Yakovlev, B.G. and Stepchenko, S.B. (1985), Mineral equilibria and conditions of metamorphism of Precambrian mafic rocks, Nauk. dumka, Kyiv, 222 p. [in Russian].
[Яковлев, Б.Г., Степченко, С.Б. (1985), Минеральные равновесия и условия метаморфизма докембрийских мафитов. Киев: Наук. думка. 222 с.]
Yesypchuk, K.Yu., Bobrov, O.B., Stepanyuk, L.M., Shcherbak, M.P., Glevaskyi, E.B., Skobelev, V.M., Drannyk, A.S. and Geichenko, M.V. (2004), Correlational chronostratigraphic scheme of the Early Precambrian of the Ukrainian Shield (scheme and explanatory note), UkrDGRI; NSC of Ukraine, Kyiv, 30 p. [in Ukrainian].
[Єсипчук, К.Ю., Бобров, О.Б., Степанюк, Л.М., Щербак, М.П., Глеваський, Є.Б., Скобелєв, В.М., Дранник, А.С., Гейченко, М.В. (2004), Кореляційна хроностратиграфічна схема раннього докембрію Українського щита (схема та поясн. зап.). Київ: УкрДГРІ; НСК України. 30 с.]