First U-Pb isotopic data on zircon from andesite of the Saf'yanovka Cu-bearing massive sulfide deposit (Middle Urals)

摘要

New results of U-Pb LA ICP-MS dating of zircon from andesite samples cropping out on the western wall of the Saf'yanovka quarry (57A degrees 22'58.88aEuro(3) N, 61A degrees 31'50.85aEuro(3) E) in the synonymous Cu-Zn-bearing massive sulfide deposit of the Urals type are considered. The position of data points of the U-Pb systematics in the Pb-207/U-235-Pb-206/U-238 plot determines a cluster practically corresponding to the concordant U-Pb age: 422.8 +/- 2.0 Ma. This date indicates for the first time the presence of Pridolian volcanogenic rocks in the East Urals megazone of the Middle Urals.