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Late Devonian Calc-Alkali High-K Fractionated Granites of the “Ferroan” I-Type, Rudny Altai

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Abstract

The results of geological, geochemical, and isotopic–geochronological studies of Late Devonian granitoids of Rudny Altai, which formed at the Hercynian stage of tectonogenesis of the Altai–Sayan sector of the Central Asian Fold Belt, are presented. The isotopic U–Pb age of zircons ranges from 367 to 363 Ma. The geochemical characteristics indicate that leucogranites belong to high-K calc-alkaline series (SiO2 > 73 wt %, Na2O + K2O = 6.9‒9.0 wt %, and Na2O/K2O = 0.7‒1.2) of the calc-alkaline and alkali-calcic subtypes (MALI (modified alkali-lime index) = 6.32‒8.41). Rocks are close to saturation with silica ( A/CNK = 0.9‒1.2) and are characterized by a high Fe* index (0.84‒0.97) and a higher F content (0.04–0.17 wt %). The variations in HSFE, LILE, and the Ga/Al ratios and a strong negative A/CNK–P2O5 correlation indicate that they belong to fractionated I-type granitoids. The Be mineralization is spatially and genetically related to leucogranites. It is suggested that the formation of granitoids was related to a synshear setting of a convergent margin as a result of oblique subduction or sliding tectonic plates of the Irtysh–Zaisan Ocean and the margin of the Siberian Continent.

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Funding

This work was supported by the Russian Science Foundation, project no. 21-07-00175 (https://rscf.ru/en/project/21-07-00175/).

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Authors and Affiliations

  1. Sobolev Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, 630090, Novosibirsk, Russia

    N. N. Kruk, M. L. Kuibida, E. N. Sokolova, P. D. Kotler & V. A. Yakovlev

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  1. N. N. Kruk
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  2. M. L. Kuibida
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  3. E. N. Sokolova
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  4. P. D. Kotler
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  5. V. A. Yakovlev
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Correspondence to N. N. Kruk.

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Translated by I. Melekestseva

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Kruk, N.N., Kuibida, M.L., Sokolova, E.N. et al. Late Devonian Calc-Alkali High-K Fractionated Granites of the “Ferroan” I-Type, Rudny Altai. Dokl. Earth Sc. 515, 639–644 (2024). https://doi.org/10.1134/S1028334X23603644

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  • DOI: https://doi.org/10.1134/S1028334X23603644

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