Model of the Separation of the Marvin Spur
from the Lomonosov Ridge in the Arctic Ocean

Al. A. Schreider

OOO NIIGazekonomika, Moscow, Russia

e-mail: aschr@ocean.ru

Received September 6, 2012; in final form, March 13, 2013

Abstract—The axes of the zones of the separation of the peripheral continental fragments of the Lomonosov
Ridge (the Marvin Spur and the local block of the Alpha Ridge) from its main body in the part of the Makarov
Basin near Greenland are restored. The Euler poles and the angles of rotation describing the separation process
are determined. The depths of the conjugate isobaths are found to be different by hundreds of meters. This cir-
cumstance most likely reflects the fact of the different scale sliding of the peripheral areas of the continental
crust from the main body of the Lomonosov Ridge down the lithospheric fault plane (and thereby the different
scale dip during the separation) according to the modified B. Wernike model presented here. The primary bot-
tom topography that existed before the separation of the sliding fragments from the ridge are restored based on
the reconstruction. For the case of the part of the Lomonosov Ridge near Greenland, it is established that the
initially peripheral sections from the part of the Lomonosov Ridge near Greenland towered over the main sur-
face of the Lomonosov Ridge approximately by half a kilometer and higher.

DOI: 10.1134/S0001437014040110

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