Neoproterozoic Age of the Iron Ore Volcanogenic–Sedimentary Series of the Ulutau Terrane (Central Kazakhstan).

The metamorphosed iron ore volcanogenic–sedimentary strata of the Karsakpai series in the eastern Ulutau Precambrian terrane of Central Kazakhstan are studied. The crystallization age of 745 ± 3 Ma is first dated for the andesidacitic tuffs by the U–Th–Pb (SIMS) method, which indicates their formation at the end of the Tonian period of the Neoproterozoic Era. [ABSTRACT FROM AUTHOR]