Zhaman-Koitass granite-leukogranite massif (Northern Kazakhstan): U-Pb age, mineralogical and geochemical features, geodynamic analysis
https://doi.org/10.24930/1681-9004-2023-23-6-1006-1026
Abstract
Research subject. The Zhaman-Koitass granite-leucogranite massif of the Borovsk complex in Northern Kazakhstan. In the platform cover of the West Siberian plate, overlying granite-leucogranites, a large uranium deposit Semizbai of sandstone type is localized. Materials and methods. Geochemical, mineralogical, and geochronological studies of granite-leucogranites were conducted by X-ray fluorescence analysis, ICP-MS, electron probe microanalysis, scanning electron microscopy, and LA-ICP-MS (Analytical Center for multi-elemental and isotope research SB RAS). Results and conclusions. The Zhaman-Koitass massif is composed by A-type subalkaline leucogranites (SiO2 = 72.8–75.4 wt %, Na2O + K2O = 7.5–8.8 wt %, K2O/Na2O = 1.11–1.25, ∑REE = 120–231 ppm, (La/Yb)n = 10–22, Eu/Eu* = 0.2–0.4), which are characterized by titanite-ilmenite-magnetite accessory specialization. U-Pb isotope dating confirms the silurian age of the Zhaman-Koitass granite-leucogranites (426–420 Ma). The obtained geochronological data, along with the similarity of the chemical composition of the rocks, confirm that the granite-leucogranites of the Zhaman-Koitass massif belong to the Borovsk complex. The significant age interval between the ordovician granitoids of the krykkuduk complex (448 ± 2 Ma) and the silurian granite-leucogranites of the karabulak and borovsk complexes considered in the article (431–426 Ma) suggests a change in the geodynamic situation from suprasubduction to transform marginal-continental.
Keywords
granite-leucogranites,
rock-forming and accessory minerals,
zircon geochemistry,
U-Pb isotopic age,
Zhaman-Koitass massif,
Northern Kazakhstan
Supporting agencies: The work was supported by the Ministry of Science and Higher Education of the Russian Federation and was carried out as part of the state assignment of IGM SB RAS (No. 122041400044-2)
About the Authors
A. G. Vladimirov
V.S. Sobolev Institute of Geology and Mineralogy, SB RAS
Russian Federation
Russian Federation
3 Academician Koptyug av., Novosibirsk 630090
A. V. Karpov
V.S. Sobolev Institute of Geology and Mineralogy, SB RAS
Russian Federation
Russian Federation
3 Academician Koptyug av., Novosibirsk 630090
I. Yu. Annikova
V.S. Sobolev Institute of Geology and Mineralogy, SB RAS
Russian Federation
Russian Federation
3 Academician Koptyug av., Novosibirsk 630090
E. I. Mikheev
V.S. Sobolev Institute of Geology and Mineralogy, SB RAS; Novosibirsk State University
Russian Federation
Russian Federation
3 Academician Koptyug av., Novosibirsk 630090;
2 Pirogov st., Novosibirsk 630090
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Review
For citations:
Vladimirov A.G., Karpov A.V., Annikova I.Yu., Mikheev E.I. Zhaman-Koitass granite-leukogranite massif (Northern Kazakhstan): U-Pb age, mineralogical and geochemical features, geodynamic analysis. LITHOSPHERE (Russia). 2023;23(6):1006-1026. (In Russ.) https://doi.org/10.24930/1681-9004-2023-23-6-1006-1026
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