Age and origin of Bereinsky complex Granitoids of Kamensky Terrane of the Monghol-Okhotsk orogenic belt: results of U-Pb (ID tims) geochronological and Sm-Nd isotope-geochemical research

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Abstract

Dating of magmatic rocks from paleo-island arcs of orogenic belts helps to define the precise timing of subduction processes that took place during the formation of the orogen. Within the central (East Trans-Baikal) part of the Mongol-Okhotsk orogenic belt, the Kamensk island-arc terrane is an example of such paleo-island-arc complex. Its intrusive part is included into the Bereinsky 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 produced in a narrow time interval – 203±1–205±1 Ma, which corresponds to 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 intrusive rocks is about 50 Ma, thus indicating in the Late Permian – Late Triassic the subduction along the northern (in modern coordinates) margin of the Mongol-Okhotsk Paleocean beneath the Siberian paleocontinent. Diorites of the first phase have positive values ɛND(254MA) = 3.2–3.6 (TNd(DM) = 879–994 Ma), and plagiogranites – ɛND(205MA) = 2.3–3.5 (TNd(DM) = 859–1028 Ma), which points to the connection of these rocks with 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. This study was supported by Russian Science Foundation, grant no. 22-27-00775. The resources of the Shared Use Center for Isotope-Geochemical Research (Vinogradov Institute of Geochemistry, Siberian Branch, Russian Academy of Sciences, Irkutsk) were used in this work.

About the authors

S. I. Dril

Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences

Author for correspondence.
Email: sdril@igc.irk.ru
Russian Federation, Irkutsk

A. A. Ivanova

Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences

Email: sdril@igc.irk.ru
Russian Federation, St. Petersburg

V. P. Kovach

Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences

Email: sdril@igc.irk.ru
Russian Federation, St. Petersburg

A. B. Kotov

Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences

Email: sdril@igc.irk.ru

Corresponding Member of the RAS

Russian Federation, St. Petersburg

E. B. Salnikova

Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences

Email: sdril@igc.irk.ru
Russian Federation, St. Petersburg

J. V. Plotkina

Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences

Email: sdril@igc.irk.ru
Russian Federation, St. Petersburg

O. V. Zarubina

Vinogradov Institute of Geochemistry, Siberian Branch of the Russian Academy of Sciences

Email: sdril@igc.irk.ru
Russian Federation, Irkutsk

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