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Age and Origin of the Bereya Complex Granitoids from the Kamenka Terrane of the Mongol–Okhotsk Orogenic Belt: Results of U–Pb (ID-TIMS) Geochronological and Sm–Nd Isotope-Geochemical Studies

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Abstract

Dating of igneous rocks from paleo-island arc complexes of orogenic belts makes it possible to determine the precise timing of subduction processes that occurred during the formation of the orogen. Within the central (East Transbaikal) part of the Mongol–Okhotsk orogenic belt, the Kamenka island-arc terrane is an example of such a complex. Its intrusive part is included into the Bereya complex, represented by a gabbro-diorite-tonalite-plagiogranite series of rocks demonstrating subduction geochemical characteristics. The dating of zircons from acidic rocks of this complex by the U–Pb classical method showed that they were formed in a narrow time interval of 203 ± 1–205 ± 1 Ma, which corresponds to the Norian–Rhaetian boundary of the Late Triassic. Taking into account the previously obtained age of the diorites (254 ± 5 Ma), the timing of formation of the entire series of the intrusive rocks is about 50 Ma, thus indicating the probable subduction along the northern (in modern coordinates) margin of the Mongol–Okhotsk Paleocean under the Siberian paleocontinent in the Late Permian – Late Triassic. The diorites of the first phase have positive values of εND(254 Ma) = 3.2–3.6 (TNd(DM) = 879–994 Ma), and the plagiogranites have ɛND(205 Ma) = 2.3–3.5 (TNd(DM) = 859–1028 Ma), which points to the relationship between these rocks and the substance of the depleted mantle source and is consistent with the Sm–Nd isotope characteristics of the juvenile crust of the Central Asian orogenic belt.

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Funding

This work was supported by the Russian Science Foundation, grant no. 22-27-00775. The resources of the Common Use Center for Isotope-Geochemical Studies at Vinogradov Institute of Geochemistry, Siberian Branch, Russian Academy of Sciences, Irkutsk were used to perform the work.

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Authors and Affiliations

  1. Vinogradov Institute of Geochemistry, Siberian Branch, Russian Academy of Sciences, Irkutsk, Russia

    S. I. Dril & O. V. Zarubina

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

    A. A. Ivanova, V. P. Kovach,  A. B. Kotov, E. B. Salnikova & Ju. V. Plotkina

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  1. S. I. Dril
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  2. A. A. Ivanova
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  3. V. P. Kovach
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  4. A. B. Kotov
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  5. E. B. Salnikova
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  6. Ju. V. Plotkina
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  7. O. V. Zarubina
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Correspondence to S. I. Dril.

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Translated by L. Mukhortova

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Dril, S.I., Ivanova, A.A., Kovach, V.P. et al. Age and Origin of the Bereya Complex Granitoids from the Kamenka Terrane of the Mongol–Okhotsk Orogenic Belt: Results of U–Pb (ID-TIMS) Geochronological and Sm–Nd Isotope-Geochemical Studies. Dokl. Earth Sc. (2024). https://doi.org/10.1134/S1028334X24601147

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  • DOI: https://doi.org/10.1134/S1028334X24601147

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