In general Laptev Sea continental margin were submerged during Late
Cenozoic, but the eastern part of transitional zone has experienced
several phases of tectonic stability and even weak uplift. Regional
subsidence of the shelf area during Late Cretaceous – Cenozoic time was
practically compensated by sedimentation: the result of this process is
extremely flat relief of the Laptev Sea shelf. Distribution of
sedimentary cover thickness shows several regularities: to the west from
128 E sediment thickness sharply increased, but to the east from this
longitude sediments are concentrated within narrow grabens while total
thicknesses decreased. Opposite regularities are common for both
Cenozoic and Quaternary deposits distribution. Within Laptev Sea shelf
hinge zone is spatially located on the prolongation of the axis of
mid-ocean Gakkel Ridge.
|Reference to this abstract:|
Gusev E., Ryazanova M. Major features of Cenozoic geodynamics of the Laptev Sea Continental Margin. Quaternary Environment of the Eurasian North (QUEEN), Fifth QUEEN Workshop, Lund, Sweden, 7-10 April, 2000, p. 49.