DEVONIAN PALEOGEOGRAPHY AND TECTONICS OF RUSSIAN ARCTIC

There are a number of differing paleo-tectonic models for the locations of the continental blocks now comprising the Russian Arctic prior to opening of the Mesozoic and Cenozoic Arctic Ocean. Here we present the overview of available data, on stratigraphy, depositional environments, provenance studies of Devonian sedimentary basins accompanied with data on coeval magmatism and tectonic events. Several well-traced unconformities have been reported from the Devonian-successions of Russian Arctic, but these are mainly is caused by fluctuations in eustatic sea level However few angular unconformities have been reported from Wrangel Island and the New Siberian Islands between different units of the Middle-Upper Devonian succession. The overview of sedimentary facies distribution and provenance signals from the Devonian deposits of the Russian Arctic show a similarity between Devonian strata of Severnaya Zemlya, the New Siberian Islands, Chukotka and Wrangel Island, whilst northern Siberia appears to have had a different Devonian geological history. Based on stratigraphic correlations, facies transitions and detrital zircon data, two groups of middle Paleozoic basins sharing a common geological history are recognized within the Russian Arctic : (1) Novaya Zemlya, New Siberian Islands, Severnaya Zemlya Archipelago, Chukotka and Wrangel Island, and (2) Northern Siberia including South - Central Taimyr.

The study was supported by RSF grants 17-17-01171.