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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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.

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S. Dril

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

编辑信件的主要联系方式.
Email: sdril@igc.irk.ru
俄罗斯联邦, Irkutsk

A. Ivanova

Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences

Email: sdril@igc.irk.ru
俄罗斯联邦, St. Petersburg

V. Kovach

Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences

Email: sdril@igc.irk.ru
俄罗斯联邦, St. Petersburg

A. Kotov

Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences

Email: sdril@igc.irk.ru

Corresponding Member of the RAS

俄罗斯联邦, St. Petersburg

E. Salnikova

Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences

Email: sdril@igc.irk.ru
俄罗斯联邦, St. Petersburg

J. Plotkina

Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences

Email: sdril@igc.irk.ru
俄罗斯联邦, St. Petersburg

O. Zarubina

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

Email: sdril@igc.irk.ru
俄罗斯联邦, Irkutsk

参考

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2. Fig. 1. Position of the Mongol-Okhotsk orogenic belt (MOOB) with the study area (A) in the system of the most important tectonic structures of Northeast Asia [3]; geological scheme of the Kamenka terrane formations of the MOOB (according to [3, 6] with modifications): 1 - formations of the West Stanovoy terrane of the MOOB; 2 - formations of the Onon terrane of the accretionary wedge of the MOOB of Devonian, Carboniferous and Permian age; 3 - terrigenous formations of the Upper Triassic of Eastern Transbaikalia; 4 - volcanogenic-sedimentary formations of the Kamenka suite of the Kamenka terrane; 5 - basic and intermediate rocks of the first intrusive phase of the Bereinsky complex of the Kamenka terrane; 6 - acidic rocks of the second intrusive phase of the Bereinsky complex of the Kamenka terrane; 7 - deposits of Jurassic and Early Cretaceous age; 8 – Late Jurassic granitoids; 9 – Quaternary deposits; 10 – major thrusts; 11 – minor thrusts; 12 – faults with unclear kinematics; 13 – geochronological sampling points; MO – Mongol-Okhotsk fault (thrust); OT – Onon-Tura fault (thrust).

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3. Fig. 2. Multicomponent (A) and variational Rb–(Y+Nb) (B) [9] diagrams for intrusive rocks of the Bereinsky complex. Legend (A): gabbro, first-phase diorites (1) and second-phase granitoids (2) of the Bereinsky intrusive complex. The composition of gabbro-diorite of normal alkalinity of the Malko-Petropavlovsk transverse zone of Eastern Kamchatka according to [7] is shown as a standard of intrusive rocks of island-arc nature. Normalization was carried out to the composition of the primitive mantle according to [8]. Legend (B): 1 – compositions of rocks of the first and second intrusive Fasbereinsky complex, 2 – composition field of the gabbro-diorite-granodiorite association of the Malko-Petropavlovsk transverse zone of Eastern Kamchatka according to [7], 3 – granitoids of the Krutogorsk and Kola complexes of Central Kamchatka [10]; ORG – composition field of oceanic ridge granites, VAG – granites of island arcs and active continental margins, WPG ‒ granites of intraplate settings, syn-COLG – syncollisional granites, post-COLG – postcollisional granites; UCC – average composition of the upper continental crust, SKK – average gross composition of the continental crust, NKK – average composition of the lower continental crust. Schematically outlined are the trends in the change in the composition of granite sources during the interaction of a depleted mantle source (DMM) under the influence of subduction fluids and subduction melts.

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4. Fig. 3. Micrographs of zircon crystals from plagiogranite Be-106 (I–VIII) and tonalite Be-110 (IX–XVI) of the Bereinsky complex, taken using a TESCAN VEGA3 scanning electron microscope: I–IV, IX–XII in secondary electron mode and V–VIII, XIII–XVI in cathodoluminescence mode.

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5. Fig. 4. Concordia diagrams for zircons from plagiogranite Be-106 (A) and tonalite Be-110 (B) of the Bereinsky complex. The point numbers on the diagrams correspond to the ordinal numbers in Table 1.

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