Abstract
The Lomonosov Ridge is situated between oceanic abyssal regions of the Eurasian Basin, on the one side, and the region of the Central Arctic Uplifts including the abyssal Makarov Basin – on the other. As its morphology and internal structure indicate, it consists of three distinct segments. The shallowest (≤ 400 m) Canada-Greenland segment is composed mostly by felsic and metamorphic rocks (basic igneous – at the part facing Alpha-Ridge). In the Near–Polar segment the ridge has double-crested top with the basin in-between. The structural trend here is at acute angle to the ridge axis and upper crust consists of basic crystalline rocks. The 12 km-thick upper crust of the 150 km-wide Siberian segment of the Lomonosov Ridge consists mainly of felsic and metamorphic rocks.
The ridge’s continental crystalline crust is 20–22 km thick, with upper and lower crusts thickness of about half of the above. Neogene-Pleistocene hemipelagic, Paleogene bathyal and possible Cretaceous deposits comprise the sedimentary cover.
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Piskarev, A.L. et al. (2019). Lomonosov Ridge. In: Piskarev, A., Poselov, V., Kaminsky, V. (eds) Geologic Structures of the Arctic Basin. Springer, Cham. https://doi.org/10.1007/978-3-319-77742-9_4
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