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Post-Accretionary Granitoids in the Structure of the Dzabkhan Terrain of the Early Caledonian Framing of the East Siberian Platform

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Abstract

The Paleozoic granitoids of the Urgamal pluton in the crystalline basement of the northwestern part of the Dzabkhan Terrain are considered. The age of these granitoids, 463 ± 2 Ma, was determined by the U–Pb method (ID-TIMS). The Urgamal pluton is located on the border of the Dzabkhan Terrain with the Early Caledonian formations of the Ozernaya Zone. The pluton was emplaced after the the Dzabkhan Terrain had converged with the paleo-oceanic and island arc complexes of the Ozernaya Zone. The granitoids are therefore attributed to post-accretionary formations occurring in the Early Caledonian superterrain of Central Asia. Intrusive complexes similar in age and structural position are known in the Caledonian Ozernaya Zone, Sangilen Block, Tuva-Mongolian Terrain, and the Olkhon Terrain of the framing of the East Siberian Platform. Geological settings of these complexes allow the time of integration of the Early Caledonian superterrain of Central Asia and the Siberian Platform to be estimated.

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ACKNOWLEDGMENTS

We are grateful to V.V. Yarmolyuk and V.P. Kovach for consultations and constructive suggestions made during the preparation of the manuscript.

Funding

This work was supported by the Russian Foundation for Basic Research (project no. 17-05-00130) and the Russian Scientific Foundation (project no 18-17-00229).

Reviewers V.P. Kovach, A.B. Kotov, and V.V. Yarmolyuk

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Authors and Affiliations

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

    I. K. Kozakov & Ju. V. Plotkina

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

    T. I. Kirnozova & M. M. Fugzan

  3. Institute of Paleontology and Geology, Academy of Sciences of Mongolia, Ulaanbaatar, Mongolia

    Ch. Erdenegargal

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  1. I. K. Kozakov
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  2. T. I. Kirnozova
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Correspondence to I. K. Kozakov.

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Translated by M. Hannibal

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Kozakov, I.K., Kirnozova, T.I., Fugzan, M.M. et al. Post-Accretionary Granitoids in the Structure of the Dzabkhan Terrain of the Early Caledonian Framing of the East Siberian Platform. Stratigr. Geol. Correl. 28, 157–166 (2020). https://doi.org/10.1134/S0869593820020021

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