Abstract
The seismic stratigraphy scheme for the shelf basins of the East Siberian Sea and the Chukchi Sea region and the adjacent deepwater area of the Amerasia basin has been developed, and mega-sequences (or tectonostratigraphic units) with the conventional ages of 125‒100, 100‒80, 80‒66, 66‒56, 46‒45, 45‒34, 34‒20, 20‒0 Ma are distinguished. Zhokhov foredeep basin of the Late Jurassic‒Neocomian age is distinguished between the New Siberia and the De Long islands. Three main phases of rifting are identified on the shelves in the region with ages of 125–100, 66–56, and 45–37 Ma. The main phase of continental rifting occurred in the Podvodnikov and Toll basins at 125‒100 Ma. The typical clinoform accumulation of sediments occurred at the edge of the shelf at 66–20 Ma. We identified three syntectonic epochs of the formation of clinoform sequences with the ages of 66–45, 45–34, and 34–20 Ma. The phase of uplifting and compression in the region of Wrangel Island happened at ≈66 Ma. The relatively monotonous tectonic setting with approximately the same thicknesses of the sedimentary cover began at 20 Ma.
Highlights
The shelves of the East Siberian and Chukchi Seas, jointly with the deepwater Podvodnikov and Toll basins (Chukchi Abyssal Plain) and the Mendeleev Rise, are conventionally referred to the East Arctic of Russia and the adjacent territories (Figs. 1, 2)
Our studies show that the sediments related to the powerful general-oceanic bottom currents started to form at approximately 18 Ma [11]
We present additional arguments for refining the seismic stratigraphy of the Arctic Ocean region
Summary
The shelves of the East Siberian and Chukchi Seas, jointly with the deepwater Podvodnikov and Toll basins (Chukchi Abyssal Plain) and the Mendeleev Rise, are conventionally referred to the East Arctic of Russia and the adjacent territories (Figs. 1, 2). The shelves of the East Siberian and Chukchi Seas, jointly with the deepwater Podvodnikov and Toll basins (Chukchi Abyssal Plain) and the Mendeleev Rise, are conventionally referred to the East Arctic of Russia and the adjacent territories Many seismic profiles (Fig. 1) that make it possible to significantly refine the geological structure of the huge area have been made for this region. The continental slope region is located to the north. The large geomorphological structure of the continental slope is the Kucherov terrace. In the deepwater part are two large basins: Podvodnikov and Toll, which are separated by the Mendeleev Rise. Towards the west from the Podvodnikov basin is Lomonosov Ridge, which separates the Amerasian and Eurasian deepwater basins. The Chukchi Plateau lies to the east of the Toll Basin
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