Abstract
This article presents the results of U–Pb geochronological study of gneiss-granites of the Mamskaya zone. The age estimate of 1874 ± 9 Ma (SIMS method) obtained for the magmatic protolith of gneiss-granites for the first time proves the close formation time of gneiss-granites from the Mamskaya zone and rapakivi-like granites of the Kodar complex in the Chara–Olekma block. In the Late Devonian and Carboniferous, according to preliminary data, the Paleoproterozoic protolith of the gneiss-granites underwent deep metamorphic processing during shear deformations and formation of pegmatoid granites and pegmatites.
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ACKNOWLEDGMENTS
The authors are grateful to E.B. Salnikova for discussion of the article, G.P. Pleskach for preparing the figure, and A.N. Larionov for the measurements.
Funding
This work was supported by the Russian Foundation for Basic Research (project no. 18-05-00724) and State Assignments for the Institute of Precambrian Geology and Geochronology, Russian Academy of Sciences (FMNU-2019-0001), and Institute of Geology of Ore Deposits, Petrography, Mineralogy, and Geochemistry, Russian Academy of Sciences (FMMN-2021-0006).
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Rytsk, E.Y., Andreev, A.A., Tolmacheva, E.V. et al. Paleoproterozoic Age of Gneiss-Granites of the Mamskaya Zone (Baikal–Patom Belt): Geological Implications. Dokl. Earth Sc. 498, 367–371 (2021). https://doi.org/10.1134/S1028334X21050159
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DOI: https://doi.org/10.1134/S1028334X21050159