Abstract
The sedimentary and provenance characteristics of seven Permo-Carboniferous and two early Cretaceous samples from the Taimyr Peninsula provide information about the latest evolution of Uralian orogeny and the opening of the Amerasian Basin. The Permo-Carboniferous samples have a mixed provenance of recycled and first cycle sediment, sourced from metamorphic and igneous terranes. U-Pb detrital zircon ages represent a mixture of Precambrian-Paleozoic grains with euhedral, penecontemporaneous late Carboniferous and Permian grains consistent with derivation from the Uralian Orogen, plus additional Timanian and Caledonian material presumably derived from Baltica. Differences between the late Permian sample and the other Carboniferous and early Permian samples are interpreted to reflect the final collisional stage of Uralian orogeny. Early Cretaceous sediments deposited at the time of the Amerasian Basin opening preserve a mixed provenance of mainly first cycle metamorphic and igneous source material, as well as an unstable heavy mineral assemblage dominated by staurolite, suggesting local derivation. Detrital zircon ages fall almost exclusively into one late Permian-early Triassic cluster, indicating a Siberia Trap-related magmatic source. The detrital zircon age spectra support a passive margin setting for Taimyr during the opening of the Amerasian Basin in the early Cretaceous.
Highlights
Several orogens, including the Uralian Orogen, extend into the Arctic, but are lost beneath its seas.The Ural Mountains represent the late Paleozoic collision between Baltica, Kazakhstan and Siberia [1,2,3]as the final stage of the assembly of Pangaea [4,5,6,7] and is believed to have played an important role in the tectonic evolution of the Eurasian Arctic continental margin [8]
We present detrital zircon U-Pb ages combined with petrography and heavy mineral data to determine the provenance of the late Paleozoic and early
Sample locations and analytical results for detrital zircon U-Pb dating are presented in Supplementary materials
Summary
Several orogens, including the Uralian Orogen, extend into the Arctic, but are lost beneath its seas.The Ural Mountains represent the late Paleozoic collision between Baltica, Kazakhstan and Siberia [1,2,3]as the final stage of the assembly of Pangaea [4,5,6,7] and is believed to have played an important role in the tectonic evolution of the Eurasian Arctic continental margin [8]. Several orogens, including the Uralian Orogen, extend into the Arctic, but are lost beneath its seas. Orogen beyond the Polar Urals is highly debated (e.g., [9,10,11,12]). Some authors argue that the orogen terminates at the Polar Urals [13,14], while others have suggested it continues northward to the Taimyr. Note the possible scenarios for the northward continuation of the Urals; (b) simplified geological map of the Taimyr Peninsula (after Bezzubtsev et al [19]; Inger et al [20]). Question marks indicate different opinions for the possible continuation of the Arctic Uralides (refer to text for details)
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