Evolution of the provenances of Triassic rocks in Franz Josef Land: U/Pb LA-ICP-MS dating of the detrital zircon from Well Severnaya

Morphological analysis and U/Pb LA-ICP-MS dating were carried out for detrital zircon (400 age determinations) from four core samples of Triassic rocks recovered by Well Severnaya (Graham Bell Island, Franz Josef Land Archipelago). It is shown that source areas were mainly composed of peraluminous granites. U/Pb LA-ICP-MS zircon data were used to decipher the provenance evolution in the northern Barents Sea region. The main source of clastic material in the North Barents sedimentary basin in the Middle-Late Triassic was the Uralian fold belt, with lesser contribution from the East European Craton (Baltica), Timanides, Taimyr, and rocks related to the Siberian plume. The clastic material was mainly transported from the south and southeast. From the beginning of the Middle to the terminal Late Triassic, influence of the Neoproterozoic sources systematically decreased, whereas contribution of Caledonian sources increased.