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3D geodynamics of Arctic region and model of Amerasia Basin formationстатья
- Авторы: Lobkovsky L.I., Kononov M.V., Verzhbitsky V.E., Garagash I.A., Kotelkin V.D.
- Сборник: Proceedings of the International Conference on Arctic Margins VI
- Том: 6
- Глава в коллективной монографии
- Год издания: 2014
- Место издания: VSEGEI Fairbanks, Alaska
- Первая страница: 287
- Последняя страница: 320
- Номер статьи: CHAPTER 14
- Аннотация: ABSTRACTThe authors suggest a new quantitative approach to describe Arctic region evolution that is based on joint 3D modeling of upper mantle flows and elastic-plastic lithosphere deformations. During Tithonian-Aptian time in the Arctic region there existed a subduction zone characterized by a particular bend and consisting of two branches - South Anyui and Pacific. Stable subduction formed an upper-mantle convective cell with a downwelling close to the subduction zone and an upwelling on the opposite side of Arctida. This configuration of Arctic region mantle flows result in a pattern of stresses and diffuse lithosphere deformations that could be responsible for Chukchi plateau-Novosibirsk (New Siberian) Islands block-Chukotka and Arctic Alaska being torn apart from Arctic Canada and moving away from it. These deformations are responsible for diffusion spreading and Canada Basin formation. Following South Anyui ocean closing and ChukotkaEurasia collision about 120 Ma the subduction zones were reorganized. New configuration of upper mantle flows led to extension and formation of the Basin and Rise Province, which included Alpha-Mendeleev Rise, Lomonosov Ridge, and Podvodnikov-Makarov basins. Given the proposed model, it is reasonable to believe that Lomonosov Ridge, Alpha-Mendeleev Rise, and the Makarov and Podvodnikov basins must be natural extensions of the mainland margins of Eurasia and North America, which in compliance with Arcticle 76 of the 1982 United Nations Convention on the Law of the Sea, creates a fundamental geological rationale to justify the extension of the limits of the continental shelf for Russia, Canada and Denmark.
- Добавил в систему: Котелкин Вячеслав Дмитриевич