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The Continental Crust beneath the Western Amerasia Basin: Mechanisms of Subsidence // Russ. Geol. Geophys. (2021) 62 (07): 721–734статья
- Авторы: Artyushkov E.V., Smirnov O.E., Chekhovich P.A.
- Журнал: Russian Geology and Geophysics
- Том: 62
- Номер: 7
- Год издания: 2021
- Издательство: ELSEVIER SCIENCE BV
- Местоположение издательства: PO BOX 211, AMSTERDAM, NETHERLANDS, 1000 AE
- Первая страница: 721
- Последняя страница: 734
- Номер статьи: 1
- Оригинальные версии: Континентальная кора в западной части Амеразийского бассейна. Механизмы погружения
- DOI: 10.2113/RGG20194143
- Аннотация: The western part of the wide Amerasian Basin in the Arctic Ocean includes two small basins: the Podvodnikov and the Makarov ones. Analysis of the data on the sedimentary-cover structure and the crustal-subsidence history suggests that despite the large depth of water (3-4 km), both basins are underlain by continental crust. Before the rapid formation of deep-water basins in the early Miocene, the crustal surface was close to the sea level for a long time. Lithospheric stretching made only a minor input to the crustal subsidence. The main cause of the subsidence was prograde metamorphism in the lower continental crust with the transformation of gabbroids into denser eclogite-type rocks. The P -wave velocities in eclogites and mantle peridotites are rather similar. Therefore, when interpreting the seismic data, high-velocity eclogites are commonly considered as the uppermost part of the mantle located below the Moho, while the overlying rocks are shown as attenuated continental crust in the Podvodnikov Basin and as oceanic crust in the Makarov Basin. The proposed mechanism makes it possible to modify the model of crustal structure and to interpret high-velocity eclogites as the lower part of the continental crust that has undergone prograde metamorphism under the impact of mantle fluids.
- Добавил в систему: Чехович Петр Андреевич