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Lomonosov Ridge—A double-sided continental margin

¹ Alfred Wegener Institute for Polar and Marine Research, Columbusstrasse, 2850 Bremerhaven, Germany
² Institute for Solid Earth Physics, University of Bergen, 5000 Bergen, Norway
³ Section of Solid Earth Physics, University of Uppsala, P.O. Box 556, 75122 Uppsala, Sweden

The first two traverses of marine multichannel seismic data across the Lomonosov Ridge (central Arctic), by the German research icebreaker Polarstern and the Swedish icebreaker Oden, demonstrate a prograded margin toward the Amerasian side and fault-bounded half grabens toward the Eurasian side of the ridge. Nearly 450 m of undisturbed flat-lying strata have been deposited on top of the peneplaned ridge since it rifted from the Barents-Kara Sea margin and subsided below sea level in early Tertiary time (64-56 Ma).

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