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Sr Isotope Composition of Mud Volcanic Waters in the Kerch–Taman Province

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Abstract

Waters at seventeen mud volcanoes of the Kerch–Taman province in the Northwestern Cis-Caucasus region have been analyzed for Sr isotope composition. The 87Sr/86Sr ratios vary from 0.70734 to 0.71076 and show positive correlation with δ18О, as well as with fluid generation temperatures estimated using the Mg–Li geothermometer. The results revealed that the mud volcano system of the province was separated from the fluid systems of deeper Mesozoic sedimentary strata that fill the West Kuban Basin. The mud volcano water budget includes a major contribution from dehydration waters that release during illitisation of smectite, which occurs within the Maykop Shale sedimentary sequence. At the same time, 87Sr/86Sr ratios reflect lithological and geochemical heterogeneity of shallow sedimentary strata of the West Kuban Basin.

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Funding

The study was supported by the Russian Science Foundation (project no. 17-17-01056P).

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Authors and Affiliations

  1. Geological Institute, Russian Academy of Sciences, 119017, Moscow, Russia

    A. S. Aydarkozhina & V. Yu. Lavrushin

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

    A. S. Aydarkozhina, V. Yu. Lavrushin & E. V. Sokol

  3. Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, 199034, St. Petersburg, Russia

    A. B. Kuznetsov & A.Yu. Kramchaninov

Authors
  1. A. S. Aydarkozhina
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  2. V. Yu. Lavrushin
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  3. A. B. Kuznetsov
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  4. E. V. Sokol
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  5. A.Yu. Kramchaninov
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Correspondence to A. S. Aydarkozhina.

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Translated by M. Hannibal

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Aydarkozhina, A.S., Lavrushin, V.Y., Kuznetsov, A.B. et al. Sr Isotope Composition of Mud Volcanic Waters in the Kerch–Taman Province. Dokl. Earth Sc. 499, 545–549 (2021). https://doi.org/10.1134/S1028334X21070023

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  • DOI: https://doi.org/10.1134/S1028334X21070023

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