Paleoproterozoic Age of Gneiss-Granites of the Mamskaya Zone (Baikal–Patom Belt): Geological Implications

• Published in: Doklady earth sciences Vol. 498; no. 1; pp. 367 - 371
• Main Authors: Rytsk, E. Yu, Andreev, A. A., Tolmacheva, E. V., Kuznetsov, A. B., Velikoslavinsky, S. D., Fedoseenko, A. M.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01-05-2021; Springer; Springer Nature B.V
• Subjects: Carboniferous; Cratons; Devonian; Earth and Environmental Science; Earth Sciences; Geochronology; Geology; Gneiss; Granite; Isotopes; Mineralogical research; Tectonics (Geology); gneiss-granites; zircon; Mamskaya zone; U–Pb geochronological research
• ISSN: 1028-334X; 1531-8354
• DOI: 10.1134/S1028334X21050159

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.