Abstract
This article presents U–Th–Pb and Lu–Hf detrital zircon isotope data, as well as whole-rock Sm–Nd isotope data on metasedimentary rocks from the eastern part of the Tukuringra Terrane. Our analyses show that the zircons in metasedimentary rocks are mostly early Mesozoic. The Early Mesozoic, Early Paleozoic and Neoproterozoic zircons are predominant and Early Precambrian zircons are almost absent in these rocks. The age of the youngest zircon population places a lower age limit of sedimentation at 204 Ma for the Tungala Formation (Upper Triassic, Rhaetian), at 181 Ma for the Dugda Formation (Lower Jurassic, Toarcian), and at 189 Ma for the Tangomen Formation (Lower Jurassic, Pliensbachian). Practically all Mesozoic, Paleozoic, and Neoproterozoic zircons are characterized by Neo- and Mesoproterozoic Hf-model ages (tHf(DM)) = 1.41–0.46 Ga, tHf(C) = 1.55–0.49) and Mesoproterozoic Nd-model ages (tNd(DM) = 1.25–1.10 Ga, tNd(C) = 1.31–1.14). These results indicate that the sedimentary rocks were mainly sourced from the Amur continental superterrane, but not from the southern framing of the North Asian Craton.
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ACKNOWLEDGMENTS
We are grateful to E.N. Voropaev, O.G. Medvedeva (Institute of Geology and Nature management, Far Eastern Branch, Russian Academy of Sciences, Blagoveshchensk), V.P. Kovach (Institute of Precambrian Geology and Geochronology of the Russian Academy of Sciences, St. Petersburg), and staff of the LaserChron Center of the University of Arizona (United States) for performance of analytical studies.
Funding
Geological studies were carried out in the framework of the State Task of the Institute of Geology and Nature Management, Far Eastern Branch, Russian Academy of Sciences (project no. АААА-А16-116051810110-7). The Sm–Nd, U–Pb, and Lu–Hf isotope studies were supported by the Russian Foundation for Basic Research (project no. 18-05-00206).
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Zaika, V.A., Sorokin, A.A. The Age and Sources of Protoliths of Metasedimentary Rocks in the Eastern Tukuringra Terrane of the Mongol–Okhotsk Fold Belt: Results of U–Th–Pb, Lu–Hf, and Sm–Nd Isotope Studies. Russ. J. of Pac. Geol. 15, 188–198 (2021). https://doi.org/10.1134/S181971402103009X
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DOI: https://doi.org/10.1134/S181971402103009X