Meta-sandstones of the Vilenga Suite in the Vetreny Belt: composition, isotopic-geochronological characteristics and sources of erosion

Isotopic-geochronological studies of meta-sandstones from the Vilenga Suite in the Vetreny Belt have allowed the identification of two primary and two secondary age group of detrital zircons. For the zircon group with a 207Pb/206Pb age of 2751±7 Ma, potential sources could be late granitoids (granodiorite-granite-leucogranites) extensively spread within northern part of Vodlozersky Domain. The source with a 207Pb/206Pb age of 2823±5 Ma has not been identified within the adjacent Karelian granite-greenstone terrain as of today. The source of zircon with an age of 2874 Ma are the rocks of the BADR series and adakites of the Sumozero-Kenozero greenstone belt. Previous studies of detrital zircons from the basal horizons of the Vetreny Belt section (Tokshinskaya Suite) and the underlying meta-sandstones (Kozhozerskaya Suite) revealed exactly the same primary age peaks, suggesting a stable tectonic setting in the early Paleoproterozoic and a limited unified erosion area. A minor contribution to the formation of meta-sandstones could be made by rocks of intermediate-acidic composition with an age of 2940 million years.