G.V. Artemenko, THE AGE AND ORIGIN OF THE ROCKS OF THE WEST AZOV GROUP (LOZUVATKA ANTIFORM, THE UKRAINIAN SHIELD)
https://doi.org/10.15407/mineraljournal.46.01.081
UDC 550.4 (477); 555.24
THE AGE AND ORIGIN OF THE ROCKS OF THE WEST AZOV GROUP
(LOZUVATKA ANTIFORM, THE UKRAINIAN SHIELD)
G.V. Artemenko, 1 DrSc (Geology), Prof., Head of Department
E-mail: regulgeo@gmail.com; orcid: 0000-0002-4528-6853
L.V. Shumlyanskyy, 2 DrSc (Geology), Professor
E-mail: lshumlyanskyy@yahoo.com; orcid: 0000-0002-6775-4419
D. Chew, 3 PhD, Professor
E-mail: chewd@tcd.ie; orcid: 0000-0002-6940-1035
F. Drakou, 3 PhD
E-mail: drakouf@tcd.ie; orcid: 0000-0001-6618-4541
І.А. Shvaika, 1 PhD (Geology), Research Fellow
E-mail: ishvaika@gmail.com; orcid: 0000-0001-9585-4380
1 M.P. Semenenko Institute of Geochemistry, Mineralogy and Ore Formation of the NAS of Ukraine
34, Acad. Palladin Ave., Kyiv, Ukraine, 03142
2 Institute of Geological Sciences of the PAS
1, Senacka, Kraków, Poland, 31-002
3 Department of Geology, School of Natural Sciences, Trinity College
College Green, Dublin 2, Ireland
Language: English
Mineralogical journal 2024, 46 (1): 81-90
Abstract: Geochronological studies of amphibole-biotite gneisses of the Verkhnii Tokmak Unit and amphibolites and Banded Iron Formation (BIF) of the Kaiinkulak Unit of the West-Azov Group in the Lypovets area of the Lozuvate antiform in the West Azov block of the Ukrainian Shield were carried out. A multi-stage history of the formation of amphibole-biotite gneisses has been established. In terms of chemical composition they correspond to quartz diorites. Rare earth elements are differentiated — (La/YbN = 7.54), with a significant negative europium anomaly — Eu/Eu* = 0.66. The REE distribution indicates that the initial melt for quartz diorites was produced in a crustal magmatic source. In zircon crystals from amphibole-biotite gneisses, relics (cores) of older zircon and mantles that surround them were distinguished. Relict zircon is coarse-zoned, cracked, and its mantles have a thin-zoned structure. A small amount of transparent non-zonal zircon crystals was also found. Based on the results of zircon dating by the LA-ICP-MS method, it was determined that the age of the relict zircon is 3.16 Ga. The thin-zonal mantles have an age of 2.9-2.8 Ga, which probably corresponds to the time of crystallization of quartz diorites. Non-zonal transparent zircon with an age of 2.1 Ga corresponds to the time of dynamometamorphism (collision). BIF of the Lypovets deposit in the West Azov iron ore province, which belongs to the Kaiinkulak Unit of the West Azov Group, has a high Ni/Fe×10–4 = 0.5-2.1 ratio, typical for the Archean BIFs of the Algoma type. This deposit is confined to an Archean greenstone belt in a synclinal structure composed of metamorphosed basaltic komatiites and sedimentary rocks. Thus, the Verkhnii Tokmak Unit comprises Mesoarchean quartz diorites of crustal genesis, while the Kaiinkulak Unit probably represents heavily metamorphosed rocks of an Archean greenstone belt.
Keywords: West Azov block, Saltycha anticlinorium, Lozuvatka antiform, Lypovets iron ore deposit, U-Pb age, zircon, gneiss, West Azov Group.
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