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Arkose Sandstones of the Kebekta Group of the Ugui Graben (Aldan Shield): Age, Provenance, and Deposition Setting

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Abstract

The results of U–Pb (ID-TIMS) and U–Th–Pb (LA-ICP-MS) geochronological studies of baddeleyite from dolerite dikes of the Sulumat Complex and detrital zircon from red arkose sandstones of the Kebekta Group of the Ugui graben, Aldan Shield, are presented. It has been established that the Kebekta Group has an age of 2.01–1.87 Ga. The provenance areas of the Kebekta Group deposits were the Archean (2.92–2.52 Ga) igneous and metamorphic complexes of the Chara–Olekma Geoblock and the zone of its junction with the Western Aldan Megablock of the Aldan Shield, as well as the Paleoproterozoic (approximately 2.01 Ga) complexes unidentified on the present erosion level. The obtained geochronological data do not contradict the correlation of terrigenous rocks of the Kebekta Group of the Ugui graben and the Kemen Group of the Kodar–Udokan trough. The deposition of arkose sandstones of the Kebekta Group correlates in age with the glaciations in Australia and Sweden (approximately 1.9–1.8 Ga) associated with the formation of the Columbia/Nuna supercontinent. It cannot be excluded either that the deposition of the rocks in the Ugui graben was related to the inflow of glacial material into the intracontinental extensional basin from the southern and/or western (in modern coordinates) framing of the Chara–Olekma Geoblock at the stage of collapse of the Paleoproterozoic orogen.

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Funding

This work was supported by the Russian Science Foundation (project no. 21-17-00164; geochronological studies) and the Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences, FMUW-2022-0003. Expedition work and sampling were carried out with the technical and financial support of “Neryungri Metallic” LLC.

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Authors and Affiliations

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

    V. P. Kovach,  A. B. Kotov, E. B. Salnikova, E. V. Adamskaya, V. V. Bortnikov, Yu. V. Plotkina & A. M. Fedoseenko

  2. Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences, 119017, Moscow, Russia

    A. V. Samsonov & K. G. Erofeeva

  3. Institute of Geology, Karelian Research Center, Russian Academy of Sciences, 185910, Petrozavodsk, Russia

    A. V. Stepanova

  4. Institute of the Earth’s Crust, Siberian Branch, Russian Academy of Sciences, 664033, Irkutsk, Russia

    T. M. Skovitina

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  1. V. P. Kovach
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  2. A. V. Samsonov
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  3. A. B. Kotov
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  4. E. B. Salnikova
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  5. E. V. Adamskaya
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  6. V. V. Bortnikov
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  7. A. V. Stepanova
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  8. K. G. Erofeeva
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  9. Yu. V. Plotkina
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  10. A. M. Fedoseenko
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  11. T. M. Skovitina
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Correspondence to V. P. Kovach.

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Translated by L. Mukhortova

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Kovach, V.P., Samsonov, A.V., Kotov, A.B. et al. Arkose Sandstones of the Kebekta Group of the Ugui Graben (Aldan Shield): Age, Provenance, and Deposition Setting. Dokl. Earth Sc. 512, 779–785 (2023). https://doi.org/10.1134/S1028334X23600998

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  • DOI: https://doi.org/10.1134/S1028334X23600998

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