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The U–Pb Age of Zircons and Metamorphism of Rocks in the Vishnevogorsky Sequence (Southern Urals)

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Abstract

The results of U–Pb zircon dating, as well as the petrologic-geochemical study of samples of zircon-bearing garnet–biotite plagiogneiss and quartz—plagioclase–amphibole granofels from the Vishnevogorsky sequence of the oldest rocks of the Eastern domain of the Southern Ural are presented. The zircon ages were obtained using an ion microprobe (SHRIMP II). The maximum age of the substrate of plagiogneises in the Vishnevogorsky sequence is not younger than 2700 Ma and the granulite metamorphism of plagiogneiss falls in the Proterozoic age range of 1740–2220 Ma. The dates obtained for plagiogneisses and granofels of the Vishnevogorsky sequence reflect all major (PR1–P1) age stages in the development of the Urals. Many of the dated events have manifested only in the zircon generations and are not reflected in the mineral parageneses of the studied rocks.

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ACKNOWLEDGMENTS

We are grateful to V.L. Andreichev and A.I. Rusin for constructive comments that allowed us to significantly improve the structure and text of the manuscript.

Funding

This study was carried out under the state task of the Ilmen State Reserve (no. 0432-2019-0001) and the Zavaritskii Institute of Geology and Geochemistry, Ural Branch, Russian Academy of Sciences (no. AAAA-A18-118052890018-7).

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Authors and Affiliations

  1. Zavaritsky Institute of Geology and Geochemistry, Ural Branch, Russian Academy of Sciences, 620016, Ekaterinburg, Russia

    A. A. Krasnobaev

  2. Ilmen State Reserve, 456317, Miass, Chelyabinsk Region, Russia

    P. M. Valizer, E. V. Medvedeva & A. B. Nemov

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

    A. L. Perchuk

  4. Institute of Experimental Mineralogy, Russian Academy of Sciences, 142432, Chernogolovka, Moscow Region, Russia

    A. L. Perchuk

Authors
  1. A. A. Krasnobaev
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  2. P. M. Valizer
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  3. E. V. Medvedeva
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  4. A. B. Nemov
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  5. A. L. Perchuk
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Corresponding authors

Correspondence to A. A. Krasnobaev, P. M. Valizer, E. V. Medvedeva, A. B. Nemov or A. L. Perchuk.

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Translated by L. Mukhortova

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Krasnobaev, A.A., Valizer, P.M., Medvedeva, E.V. et al. The U–Pb Age of Zircons and Metamorphism of Rocks in the Vishnevogorsky Sequence (Southern Urals). Moscow Univ. Geol. Bull. 75, 254–267 (2020). https://doi.org/10.3103/S0145875220030072

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  • DOI: https://doi.org/10.3103/S0145875220030072

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