U-Pb isotope and REE composition of zircon from the pyroxene crystalline schists of the Irkut terrane, Sharyzhalgai Uplift: Evidence for the Neoarchean magmatic and metamorphic events

Knowledge of the trace element composition of zircon is required in order to interpret correctly the obtained dates, because its zones that were grown or recrystallized at high temperature metamorphism significantly differ in terms of REE distribution from their magmatic analogues. This paper reports the results of study of zircons from high grade basic rocks, i.e., pyroxene crystalline schists, which allowed us to determine the formation time of their magmatic protoliths and metamorphism, as well as to estimate the conditions of zircon formation.