Abstract
A comprehensive geological and geophysical analysis of numerous materials on the anomalous magnetic field of the Amundsen and Nansen basins in the Arctic Ocean and a revision of the identification of paleomagnetic anomalies based on modeling of the inversion magnetoactive layer of the ocean crust made it possible to create a modern version of the geochronology of the bottom of the Eurasian basin. The initial stage of the formation of the Eurasian basin of the Arctic Ocean is interconnected with the processes of stretching and rifting in the Siberian shelf in the Cretaceous-Paleogene time. The transformation of rifting into spreading occurred in connection with the beginning of the detachment from the Siberian shelf of the continental crust block of the Lomonosov Ridge somewhat earlier than the time of paleoanomaly A26, which was first identified and mapped. At the second stage of evolution, rifting turned into spreading, and the rate of expansion of new oceanic crust in the interval of paleoanomalia A26-A24 (59–53 million years ago) was more than 2.5 cm/year. At the same time, the northern flank of the mid-Arctic increased more intensively than the southern one. The third stage was characterized by a further progressive deceleration of the bottom growth process, the minimum of which, with growth rates of about 1 cm/year, occurred during the formation of paleoanomalia A13-A6 (30–20 million years ago). The fourth stage of growth of the new oceanic crust began later than the time of paleoanomaly a6 and is characterized by some intensification of growth at rates up to 1.2 cm/year. The average rate of bottom expansion over an interval of almost 60 million years was close to 1.3 cm/year, which makes it possible to classify the mid-Arctic ridge as a slow-growing mid-ocean ridge.
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Schreider, A.A., Brekhovskikh, A.L., Sazhneva, A.E., Galindo-Zaldivar, J., Klyuev, M.S., Rakitin, I.Y. (2023). Geochronology of the Eurasian Basin Floor. In: Chaplina, T. (eds) Processes in GeoMedia—Volume VI. Springer Geology. Springer, Cham. https://doi.org/10.1007/978-3-031-16575-7_40
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