Iron Ore Series of the Sarysu–Teniz Watershed (Central Kazakhstan): Age Substantiations and Formation Setting

This work presents the results of the study of the Late Precambrian volcanogenic-sedimentary iron ore Bozdak series of the Sarysu–Teniz watershed in the west of Central Kazakhstan. The first U–Th–Pb (SIMS) age estimates (718 ± 5 Ma) of accessory zircons from trachyrhyolites indicate that they have been formed at the very beginning of the Cryogenian period of the Neoproterozoic. Geochemical features of the effusive rocks show that the accumulation of ferruginous quartzites has been accompanied by contrasting basalt-trachyrhyolite volcanism in the rift setting.