SEDIMENTS IN THE GAKKEL RIDGE RIFT ZONE (Arctic Ocean): STRUCTURE AND HISTORY
P.V. Rekant1,2, E.A. Gusev1
1I.S. Gramberg All-Russian Research Institute of Geology and Mineral Resources of the World Ocean, Angliiskii pr. 1, Saint Petersburg, 191120, Russia
2Karpinsky All-Russian Research Geological Institute, Srednii pr. 74, Saint Petersburg, 199106, Russia
Keywords: Rift zone, sediments, Eurasian Basin, Arctic Ocean, Gakkel Ridge
Abstract
The available seismic and magnetic data show the Gakkel Ridge rift zone consisting of the Atlantic and Siberian segments divided by a tectonic suture at 70º E. The two segments have had different histories recorded in their sedimentary cover. Apart from the difference in its morphology, the Siberian segment differs from the Atlantic one in the existence of a series of deposition centers, which might represent a vast Paleogenic basin that formed prior to the Gakkel Ridge. The simple model of North Atlantic spreading fails to explain the long and complex history of the Gakkel Ridge rift and the existence of the depocenters. The particular structure of this zone might have resulted from the growth of rift mountains by accretion of magmatic material during the Paleogene, without significant sea floor spreading.
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