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Zircon Isotope Dating of Jurassic Basalts from the Goitkh Volcanic Region of the Western Caucasus

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Abstract—The results of U–Th–Pb-isotope dating of accessory zircons from basalts of the Goitkh volcanic region (GVR) in the West Caucasus are presented. A sample for isotope dating was taken from basalt porphyrites of the Chataltopa volcanic complex at the Tuapse River basin. Isotope geochronology using an ion probe showed that the basalts of this complex in the GVR were discharged during the Jurassic at the Aalenian–Bajocian boundary (169 Ma) within the period of the tectonic transformation of an axial trough in the rifting basin of the Greater Caucasus. Zircons in the basalts are characterized by a low Th/U ratio that is peculiar to rocks of an acidic composition; this indirectly confirms that the evolution of Jurassic rifting magmatism in the Caucasus proceeded via the assimilation of continental crust.

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ACKNOWLEDGMENTS

The authors are much grateful to N.B. Kuznetsov, A.L. Perchuk, and V.A. Lebedev for productive consideration of the report subject and for their important remarks.

Funding

The study was supported by the Ministry of Natural Resources and the Environment of Russia, the Karpinsky Russian Geological Research Institute (VSEGEI), Kavkazgeols”emka Co., Mineralogical Museum of the Russian Academy of Science, Lomonosov Moscow State University, and the project SCOPES SNS Foundation (project no. IZ73Z0_152392).

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Authors and Affiliations

  1. Fersman Mineralogical Museum, Russian Academy of Science, 119071, Moscow, Russia

    Yu. V. Gerasimov

  2. Department of Geology, Moscow State University, 119991, Moscow, Russia

    A. A. Ul’yanov

  3. Karpinsky Russian Geological Institute, 199106, St. Petersburg, Russia

    V. A. Snezhko

  4. Fribourg University, Fribourg, Switzerland

    J. Mosar

  5. Kavkazgeols’emka Co., Yessentuki, Russia

    V. A. Lavrishchev

  6. Institute of Geology of Ore Deposits, Petrography, Mineralogy and Geochemistry, Vladikavkaz Scientific Center, Russian Academy of Sciences, Vladikavkaz, Russia

    V. M. Gazeev & A. G. Gurbanov

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  1. Yu. V. Gerasimov
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  2. A. A. Ul’yanov
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  3. V. A. Snezhko
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  4. J. Mosar
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  5. V. A. Lavrishchev
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  6. V. M. Gazeev
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  7. A. G. Gurbanov
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Corresponding authors

Correspondence to Yu. V. Gerasimov, A. A. Ul’yanov, V. A. Snezhko, J. Mosar, V. A. Lavrishchev, V. M. Gazeev or A. G. Gurbanov.

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Translated by A. Rylova

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Gerasimov, Y.V., Ul’yanov, A.A., Snezhko, V.A. et al. Zircon Isotope Dating of Jurassic Basalts from the Goitkh Volcanic Region of the Western Caucasus. Moscow Univ. Geol. Bull. 77, 191–197 (2022). https://doi.org/10.3103/S014587522202003X

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  • DOI: https://doi.org/10.3103/S014587522202003X

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