For the construction of the maps on sheet numbers T-49-52 and T-53-56 of
the State Geological Map of the Russian Federation with a scale of 1:1 000 000,
various data was gathered and analyzed on the geological structure of the Laptev
Sea continental margin and the adjacent part of the deep-ocean basin of the
Eurasian sub-basin of the Artic Ocean. The geology of this part of the Eurasian
Continental Margin is unique because of the presence of the Gakkel Ridge, the
slowest spreading ridge in the world system of the mid-oceanic ridges, which
encroaches and ends here. In order to create the conditional topographical basis
for the State Geological Map with a scale of 1:1 000 000, a detailed bathymetric
map of this region was constructed by the GUNiO MO. Comprehensive analysis of
the original bathymetry, seismoacoustic data and MCS profiling, as well as
information of modern seismic activity of the Gakkel Ridge led us to discover
the main features of its end in the Laptev Sea. Dissected by post-Miocene faults,
the very thick sediment that completely fills the rift valley, as well as the
poor definition in the modern relief of the Gakkel Ridge are evidence of the
impulsive character of its development with shorter periods of tectonic activity
followed by longer periods of tectonic inactivity. The character of the
distribution of seismic complexes of sedimentary cover shows that the pectinal
part of the ridge is dome-shaped with a rising of the lower seismic complexes
from the Nansen and Amundsen Basins towards the Rift Mountains. This is evidence
of the complicated multi-phased history of the encroachment of the oceanic rift
within the borders of the Continental Margin.
Fig. 6, references Ц 28.
Gusev E.A., Zayonchek A.V., Mennies M.V., Rekant P.V., Roudoy A.S.,
Rybakov K.S., Chernyh A.A. The End of the Gakkel
Ridge In The Laptev Sea // Geological-geophysical
features of the lithosphere of the Arctic Region. St.
Petersburg, VNIIOkeangeologia, 2002. є 4,
40-54 (in Russian).