Abstract
The age and origin of the Paleoproterozoic granitoids in the folded framing of the Siberian Craton arouse great interest in recent years. Isotopic-geochronological studies revealed three age groups of the Paleoproterozoic granitoids [1]: (1) granitoids of “ancient magmatic arcs” belonging to the Chuya Complex (2020 ± 12 Ma); (2) collisional two-mica granitoids of the Nichat Complex (1906 ± 6 Ma) and gneissic granites of the gneissic-dome zone in the Ol’khon region (1890 ± 25 Ma); and (3) postcollisional granitoids of the Primorye, Chuya–Kodar, Sayan, Shumikha, and other complexes (1.88–1.84 Ga) that make up the extended South Siberian igneous belt.
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