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Age and Geodynamic Conditions of Formation for the Neoproterozoic Gold-Bearing Granitoids in the Eastern Sayan

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Abstract

The paper discusses the results of petrogeochemical and geochronological studies of the Tainsky granitoid stock containing the Tainsky gold deposit in the East Sayan. The Tainsky granitoid stock intrudes through ultrabasites of the Ospa-Kitoi ultrabasitic massif. Granitoids are the part of the ophiolite cover which overlap Archean basement rocks of the Tuva-Mongolian microcontinent of the Archean foundation. Consistent isotopic age values in the range of 850–860 Ma obtained by three independent methods (U–Pb, Re–Os, 40Ar/39Ar) are evidence of the Neoproterozoic age of granitoid magmatism and its genetic relationship with gold–(±copper)–porphyry mineralization. The geological setting, geochemical characteristics, and age of the Tainsky granitoid stock allow us to attribute these rocks to the Neoproterozoic Dunzhugur island arc sequences. Isotopic age values obtained by Rb–Sr and 40Ar/39Ar methods characterized by lower closure temperatures of isotopic systems make it possible to distinguish several tectonothermal events at 650, 435, 339–333, and 280–223 Ma, reflecting difference stages of tectonic evolution of the Eastern Sayan segment of the Central Asian folding belt.

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ACKNOWLEDGMENTS

The authors thank the Collective Use Center “Analytical Center of Mineral–Geochemical and Isotope Studies” of Geological Institute, Siberian Branch of the Russian Academy of Sciences (Ulan Ude) and the Center for Multielement and Isotope Studies of the Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences (Novosibirsk) for conducting analytical studies.

The authors are sincerely indebted to the reviewer, Prof. M.V. Luchitskaya (Geological Institute of the Russian Academy of Sciences, Moscow), and an anonymous reviewer for commentary that improved the article.

Funding

The studies were carried out under the state task of Geological Institute and Sobolev Institute of Geology and Mineralogy (both are of the Siberian Branch of the Russian Academy of Sciences) with financing from the Russian Ministry of Science and Higher Education, as well as grants from the Russian Foundation for Basic Research (project nos. 18-05-00489а and 17-05-00936а).

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Authors and Affiliations

  1. Geological Institute, Siberian Branch, Russian Academy of Sciences, 670047, Ulan-Ude, Russia

    B. B. Damdinov, V. B. Khubanov, A. G. Mironov & L. B. Damdinova

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

    S. M. Zhmodik & A. V. Travin

  3. Novosibirsk State University, 630090, Novosibirsk, Russia

    A. V. Travin

  4. Novosibirsk State Technical University, 630073, Novosibirsk, Russia

    A. V. Travin

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  1. B. B. Damdinov
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  2. S. M. Zhmodik
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  3. V. B. Khubanov
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  4. A. G. Mironov
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  5. A. V. Travin
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  6. L. B. Damdinova
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Correspondence to B. B. Damdinov.

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Reviewer: M.V. Luchitskaya

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Damdinov, B.B., Zhmodik, S.M., Khubanov, V.B. et al. Age and Geodynamic Conditions of Formation for the Neoproterozoic Gold-Bearing Granitoids in the Eastern Sayan. Geotecton. 54, 356–365 (2020). https://doi.org/10.1134/S001685212002003X

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