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Neoproterozoic and Cambrian Protolith of the Metamagmatic Rocks of the Maksyutovo Metamorphic Complex in the Southern Urals: Results of U–Th–Pb (SIMS) Dating of Accessory Zircon

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Abstract

The U–Pb age of accessory zircon of the magmatic protolith for various metamorphic rocks of the UHP Maksyutovo complex is determined by the U–Th–Pb SIMS (SHRIMP II) method. The protolith age is most confidently estimated for metabasite shales in two samples (648 ± 3 and 566 ± 3 Ma). The age of zircon from shales, the chemical composition of which corresponds to andesidacites, is 549 ± 4 Ma. The age of the protolith from garnet–omphacite metabasite rocks is 501 ± 5 Ma. Individual crystals of magmatic zircon 893 ± 6 Ma in age, representing a xenogenic population, are separated from eclogites. The age value of 561 ± 10 Ma is taken for the protolith of eclogites, according to the data of the previous researchers. Magmatic complexes with an age close to the age range obtained for the protolith (549–648 Ma) are known in the Uraltau zone and represent fragments of the volcanic–plutonic belt of the active continental margin. The integrated age of metamorphism in the Maksyutovo complex from two samples of this area is 380 ± 3 Ma.

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Funding

This work was supported by the Russian Foundation for Basic Research, project no. 20-05-00308, under a State Assignment of the Geological Institute, Russian Academy of Sciences.

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Authors and Affiliations

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

    A. V. Ryazantsev, B. G. Golionko, A. V. Skoblenko & A. A. Razumovskiy

  2. Institute of Geochemistry and Analytical Chemistry of the Russian Academy of Sciences, 119991, Moscow, Russia

    S. N. Sobolev

Authors
  1. A. V. Ryazantsev
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  2. B. G. Golionko
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  3. A. V. Skoblenko
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  4. A. A. Razumovskiy
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  5. S. N. Sobolev
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Correspondence to A. V. Ryazantsev.

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Translated by L. Mukhortova

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Ryazantsev, A.V., Golionko, B.G., Skoblenko, A.V. et al. Neoproterozoic and Cambrian Protolith of the Metamagmatic Rocks of the Maksyutovo Metamorphic Complex in the Southern Urals: Results of U–Th–Pb (SIMS) Dating of Accessory Zircon. Dokl. Earth Sc. 514, 5–16 (2024). https://doi.org/10.1134/S1028334X23602377

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