Petrogenesis, U–Pb Age, and Lu–Hf Systematics of Rocks of the Garevka Complex (Northern Yenisei Ridge): Evidence of the Grenville Events at the Western Margin of the Siberian Craton

It is established for the first time that biotite plagiogneisses from the Garevka metamorphic complex of the North Yenisei Ridge have geochemical characteristics of C -type adakites with island-arc melt sources. The Hf isotopic composition of zircons indicates the participation of several sources in the formation of the granite melt, including the juvenile mantle and older crustal rock protoliths with model ages T Hf (DM) с = 1838–1916 and 1965–2357 Ma, respectively. Based on the results of U–Pb dating of zircons, new pulses of Neoproterozoic endogenous activity at the western margin of the Siberian Craton (913 ± 11 and 915 ± 36 Ma for adakite-like granites and 932 ± 26 Ma for leucogranites), correlating with the Grenville tectonic events, were determined. These Grenville episodes of regional crustal evolution are correlated with the synchronous successions and a similar style of tectonothermal events along the Arctic margin of the supercontinent Rodinia. This confirms the spatial proximity of Siberia and the North Atlantic cratons (Laurentia and Baltica), which is consistent with the proposed Neoproterozoic paleogeographic reconstructions of Rodinia.