The Neoproterozoic evolution of the western Siberian Craton margin: U-Pb-Hf isotopic records of detrital zircons from the Yenisey Ridge and the Prisayan Uplift

摘要: Abstract We present new LA ICP-MS U-Pb-Hf detrital zircon data from Neoproterozoic sedimentary basins located along the south-western margin of Siberian Craton. In Yenisey Ridge (the Taseeva basin), siliciclastic units contain abundant 2.7–2.5 Ga, 2.0–1.75 Ga and 0.95–0.57 Ga populations, whereas for Prisayan Uplift slightly different ages 3.0–2.5 Ga, 2.2–1.8 Ga 0.95–0.65 Ma are common. Mid sandstones were deposited in a rift setting or rifted cratonic facing back-arc basin, immature to submature upper Ediacaran Lower Cambrian fluvial successions probably foredeep setting, at expense proximal igneous suites underlying metasedimentary basement. A range eHf values −10 +14 indicates intense mixing between juvenile evolved magma components continental arc ca. 950–570 Ma. Geological evidence, persistent input material derived ancient crustal western evolution Hf isotopic compositions suggest that system and, partly, Sayan orogens developed active Siberia. Neoproterozoic, extended periphery Rodinia into Taimyr orogen northern Siberia Valhalla north-eastern Laurentia.