Tectonics of the Eastern Arctic and origin of the Amerasia Basin

Sokolov, S.D.; Lobkovsky, L.I.; Vernikovsky, V.A.; Poselov, V.A.; Smirnov, O.E.; Tuchkova, M.I.; Shipilov, E.V.; Sorokhtin, N.O.; Baranov, A.A.; Bobrov, A.M.; Zholondz, S.M.

Авторы: Sokolov S.D., Lobkovsky L.I., Vernikovsky V.A., Poselov V.A., Smirnov O.E., Tuchkova M.I., Shipilov E.V., Sorokhtin N.O., Baranov A.A., Bobrov A.M., Zholondz S.M.
Журнал: Russian Geology and Geophysics
Том: 67
Номер: 1
Год издания: 2026
Издательство: ELSEVIER SCIENCE BV
Местоположение издательства: PO BOX 211, AMSTERDAM, NETHERLANDS, 1000 AE
Первая страница: 34
Последняя страница: 61
DOI: 10.2113/RGG20254961
Аннотация: We provide a brief description of the main structures in the Eastern Arctic, in the evolutionof which two major stages have been distinguished and considered: the late Paleozoic–early Mesozoic and the Late Jurassic–Early Cretaceous. We have established the synchronicityof tectonic events on the Arctic margins of Northeast Asia and Arctic Alaskaand within the structures of the Amerasia Basin, indicating the existence of a cause-andeffectrelation between the compression (fold-and-thrust structures) and extension (riftingand spreading in the Canada Basin). We have proposed the tectonic models of the formationof fold-and-thrust structures in Chukotka and Arctic Alaska and have determined theirsimilarities and differences. Paleotectonic reconstructions have been performed for 160 and120 Ma. We present a critical review of the concepts about the formation of the structures inthe Amerasia Basin and provide a subduction-convection geodynamic model according tothe analysis of seismic tomography of the mantle and regional geology and tectonics data.This model was previously used to describe the Cretaceous and Cenozoic evolution of theArctic lithosphere at a qualitative level. The model is based on the idea of the existence ofa two-tier subduction system: a horizontally extended convection cell in the upper mantle,coupled with a conveyor mechanism of subduction of the Pacific lithosphere. As a result,there is a convergence of the “outer” Pacific subduction zone and the “inner” subductionzone located inside the South Anyui and Angayucham oceanic basins, which provides theirclosure and subsequent collision. Under the influence of the reverse upper mantle flow,scattered deformations of the Amerasia lithosphere occur, caused by viscous dragging withflows beneath the lithosphere, which is the reason for the diversity of the structures in theAmerasia Basin and the Canada Basin in particular. In addition, the developed geodynamicmodel is supplemented by a tectonic and magmatic mechanism of crustal subsidence and theformation of sedimentary basins.Tectonics, geodynamics, Mesozoic, Eastern Arctic, Amerasia Basin, Chukotka, Arctic Alaska, CentralArctic uplifts
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