V.V. Sukach, GEOCHEMISTRY AND MINERALOGY OF APLITE-PEGMATOID GRANITES OF THE LOWER BAZAVLUK (MIDDLE DNIPRO PROVINCE)
https://doi.org/10.15407/mineraljournal.47.02.070
UDC 550.4:552.3(477.63)
GEOCHEMISTRY AND MINERALOGY OF APLITE-PEGMATOID GRANITES
OF THE LOWER BAZAVLUK (MIDDLE DNIPRO PROVINCE)
V.V. Sukach 1, DrSc (Geology), Senior Research Fellow, Head of Department
E-mail: svital@ukr.net; orcid: 0000-0002-4710-7230
S.I. Kurylo 2, PhD (Geology), Research Fellow
E-mail: kurylo.sergiy@gmail.com; orcid: 0000-0003-4466-6851
K.V. Rudenko 3, PhD (Geology), Senior Scientist,
E-mail: rudenkokseniiav@gmail.com; orcid: 0000-0002-9353-193X
L.M. Stepanyuk 1, DrSc (Geology), Corresp. Member of NAS of Ukraine, Prof., Deputy director
E-mail: stepaniuk@nas.gov.ua; orcid: 0000-0001-5591-5169
L.V. Іsakov 1, DrSc (Geology), Senior Scientist
E-mail: isakov_l@ukr.net; orcid: 0000-0002-7672-9602
Yu.O. Lytvynenko 1, Postgraduate
E-mail: ulitvi@gmail.com; orcid: 0000-0002-7937-0164
1 M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine
34, Acad. Palladin Ave., Kyiv, Ukraine, 03142
2 Earth Science Institute of the Slovak Academy of Sciences
1, Ďumbierska Str., Banská Bystrica, Slovakia, 97411
3 The National Museum of Natural History at the National Academy of Sciences of Ukraine
15, Bohdan Khmelnitsky, Kyiv, Ukraine, 01030
Language: Ukrainian
Mineralogical journal 2025, 47 (2): 70-87
Abstract: The aplite-pegmatoid granites of the Krutyi Bereh massif in the lower basin of the Bazavluk River, which was first identified on the eastern flank of the Bazavluk pegmatite field within the Saksagan plagiogranite-migmatite dome, have been studied. The massif is confined to the Ivanivka fault of submeridional strike and has an elongated shape with dimensions of 3.5 × 9 km. The host rocks are ultrametamorphic granitoids of the Dnipropetrovsk complex with remnants of amphibolites and crystalline schists of Auly series. The aplite-pegmatoid granites of the massif were studied in outcrops on the right bank of the Bazavluk River on the northern margins of the village of Krutyi Bereh. The mineral composition of the aplite-pegmatoid granites is relatively homogeneous: feldspars (plagioclase + microcline — 70—76% and quartz — 24—27%. Based on petrographic and morphological characteristics, three generations of plagioclase and the same number of microcline generations have been identified. Secondary minerals are represented by biotite (~1%), muscovite (1—3 %), epidote, and the ore mineral magnetite. Accessory minerals identified in the samples include apatite, zircon, garnet, monazite, titanite, and allanite. Some samples contain rare inclusions of xenotime and ilmenite. The plagioclases are predominantly represented by albite (2.0—10.5% An), with occasional occurrences of oligoclase. All studied plagioclases belong to the low-temperature range (300—400°C). Microcline is characterized by well-ordered triclinic varieties with a high degree of structural order (triclinicity 0.7—1.0). Aplite-pegmatoid granites are leucocratic, high-alumina rocks of the subalkaline series. A low content of rare earth elements (REE) was detected, except for the increased concentration of Ba and Ga. There is also a severe deficit of Zr, Cu, Zn and Ni. There are two types of REE distribution: 1) V-shaped with a slight deficit in intermediate lanthanides and a positive europium anomaly (Eu* = 1.84); 2) negative distribution curve (La/Ybn = 0.5) with a pronounced negative europium anomaly (Eu* = 0.5). The deficit of REE and Zr is explained by their possible extraction during the crystallization of earlier facies granitoids, where they were concentrated in REE-bearing minerals such as monazite, apatite, sphene, orthite and zircon. Despite the detailed petrographic, mineralogical and geochemical studies, the question of the chronostratigraphic affiliation of the studied aplite-pegmatoid granites remains open. The authors of this article consider it more likely that the rocks were formed during the final phase of the ultrametamorphic Dnipropetrovsk complex formation. However, their possible connection with the plutonic Tik and Mokra Moskovka complexes is not excluded.
Keywords: aplite-pegmatoid granites, Krutyi Bereh massif, Bazavluk pegmatite field, Middle Dnipro megablock.
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