Ferruginious-aluminous metapelites of the North Yenisei Ridge: Formation paleosettings, nature and age of protolith

Research subject. Fe- and Al-rich metapelites of the Teya, Garevka Angara complexes North Yenisei Ridge (western margin Siberian craton) were studied. methods. Recently-obtained geochronologic (SHRIMP II U-Pb zircon dating) geochemical data on distribution major trace elements used to reproduce composition age protolith, along with paleofacies formation conditions. Results. The ferruginous-aluminous consitute redeposited metamorphosed products Precambrian weathering crusts predominantly kaolinite rather than lateritic type, as was previously thought. chemical rocks in Early Proterozoic did not reach deep stage lateritization zones final decomposition aluminosilicates; however, this process limited kaolinite-illite-montmorillonite-quartz composition. Conclusions. petro- characteristics studied are mainly due features sedimentation during which could have been formed erosion Lower microgneisses craton ages range 1962-2043 Ma involvement granitoid volcanic admixture mafic into area subsequent accumulation marginal continental shallow basins under conditions a humid climate calm tectonic regime. These results consistent lithofacies analysis geodynamic reconstructions evolution geological Ridge.