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The Lower Boundary of the Vendian in the Southern Urals as Evidenced by the Rb–Sr Age of Glauconites of the Bakeevo Formation

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Abstract—

This work presents the results of the mineralogical, crystallochemical, and geochronological study of globular phyllosilicates (GPS) of glauconite–illite series from the Bakeevo Formation. This formation is the basal member of the Vendian Asha Group in the Southern Urals. The monomineral GPS fractions representing the globules varying in size and density are composed of Al-glauconite and illite. The Rb–Sr dating of the GPS of the Bakeevo Formation in combination with the modeling of cation distribution in their structure and comparison of the model data with Mössbauer and IR spectroscopy data was performed for the first time. The Rb–Sr age of the Bakeevo glauconite is 642 ± 9 Ma. The mineralogical and geochemical characteristics in combination with model calculations show that the stratigraphic significance of this age is quite reasonable. The initial 87Sr/86Sr ratio in the glauconitization environment is 0.7080 ± 0.0009 and is consistent within the experimental error with this ratio in the Vendian seawater. Thus, the lower boundary of the Vendian in the Southern Urals has an age of about 640 Ma.

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ACKNOWLEDGMENTS

We are grateful to O.L. Galankina for microprobe study, E.V. Pokrovskaya for X-ray study of minerals, and O.V. Dorzhieva for IR spectroscopy.

Funding

This work was performed within the framework of the Programs of Fundamental Research of the Presidium of the Russian Academy of Sciences no. 17 (project no. 0135-2018-0050) and no. 19 (project no. 0153-2019-0009) and the State Task of the Institute of Geology (Ufa Federal Research Center, Russian Academy of Sciences) (project no. 0252-2017-0016). The work was supported by the Russian Foundation for Basic Research (project nos. 19-05-00886 and 17-05-00254).

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Authors and Affiliations

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

    T. S. Zaitseva, A. B. Kuznetsov, I. M. Gorokhov & G. V. Konstantinova

  2. Institute of Geology, Ufa Federal Research Center, Russian Academy of Sciences, Ufa, Russia

    V. M. Gorozhanin

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

    T. A. Ivanovskaya

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  1. T. S. Zaitseva
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Zaitseva, T.S., Kuznetsov, A.B., Gorozhanin, V.M. et al. The Lower Boundary of the Vendian in the Southern Urals as Evidenced by the Rb–Sr Age of Glauconites of the Bakeevo Formation. Stratigr. Geol. Correl. 27, 573–587 (2019). https://doi.org/10.1134/S0869593819050083

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