Abstract
Based on obtained data, the paper considers the structure of the sedimentary cover and basement in the continent–ocean transition zone. We analyze the structure of modern tectonic activity zones in the Laptev Sea and structurally similar zones in the Novosibirsk Trough and the De Long Massif. Three sedimentary Anisin–Laptev, Amundsen, and West Laptev basins separated by basement uplifts are distinguished in sedimentary cover. The Anisin–Laptev Basin is separated from the West Laptev Basin by the North Laptev Horst and from the Amundsen Basin by an uplift stretching from the Lomonosov Ridge and covered by the Neogene–Quaternary deposits. The modern tectonic activity zone, marked by a rift valley and earthquakes, stretches across the continental slope from the Gakkel Ridge above a sedimentary rock sequence possessing many-kilometers thickness. The zone reached its present-day position in the Pliocene. Near the shelf boundary, the zone bifurcates, with one branch departing into the West Laptev Basin, and the other branch departing into grabens that developed to the west of New Siberian Islands forming the Laptev microplate.
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ACKNOWLEDGMENTS
The authors would like to thank the following people: their colleagues who took part in the studies of the geological structure of the Laptev Sea and polar regions; E.V. Brui, K.I. Bulatkina, and D.V. Bezumov (VNIIOkeangeologiya, St. Petersburg) for aid in processing the materials; and S.P. Pavlov and T.A. Kirillova (Marine Arctic Geological Expedition, MAGE, Murmansk) for discussion of the materials.
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Piskarev, A.L., Avetisov, G.P., Kireev, A.A. et al. Structure of the Laptev Sea Shelf–Eurasian Basin Transition Zone (Arctic Ocean). Geotecton. 52, 589–608 (2018). https://doi.org/10.1134/S0016852118060067
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DOI: https://doi.org/10.1134/S0016852118060067