Abstract
This paper reports the geochemical, U–Pb geochronological, and Sm-Nd isotopic–geochemical data on granites of the Medvedka Massif in the northern part of the Nora–Sukhotino terrane. It has been found that these granites have an age of 378 ± 3 Ma. They contain ferruginous silicates, have high iron index (FeO*/(FeO*+MgO)), low concentrations of Al2O3, CaO, MgO, high contents of Nb, Ga, Y, a deficiency of Sr and Eu, positive values of εNd(t) (+3.0…+4.1), and a high Y/Nb ratio. All these data indicate that the granites of the Medvedka massif are A2-type granites. The Late Devonian hastingsite–biotite granites of the Medvedka massif most likely reflect a transform continental margin setting in the evolution of the South Mongolian–Khingan orogenic belt.
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ACKNOWLEDGMENTS
We are grateful to our collaborators at the Analytical Center of the Institute of Geology and Nature Management of the Far East Branch, Russian Academy of Sciences (A.I. Palazhchenko, V.I. Rozhdestvina, E.S. Sapozhnik, E.V. Ushakova), Kosygin Institute of Tectonics and Geophysics of the Far East Branch, Russian Academy of Sciences (V.E. Zazulina, E.M. Golubeva, A.V. Shtareva), and Institute of Precambrian Geology and Geochronology of the Russian Academy of Sciences (V.P. Kovach) for the performance of analytical studies.
The reviewers A.V. Grebennikov and A.B. Kotov are thanked for constructive comments and discussion.
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Smirnov, Y.V., Sorokin, A.A. & Kudryashov, N.M. The First Evidence for Late Devonian Granitoid Magmatism in the Northeastern Flank of the South Mongolia–Khingan Orogenic Belt. Russ. J. of Pac. Geol. 15, 39–50 (2021). https://doi.org/10.1134/S1819714021010073
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DOI: https://doi.org/10.1134/S1819714021010073