Sedimentary structure of the Nansen and Amundsen basins, Arctic Ocean

Details Sedimentary structure of the Nansen and Amundsen basins, Arctic Ocean Sedimentary structure of the Nansen and Amundsen basins, Arctic Ocean

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004georl..3102603j&link_type=abstract

Geophysical Research Letters, Volume 31, Issue 2, CiteID L02603

Physics

Geophysics

10

Marine Geology And Geophysics: Marine Seismics (0935), Marine Geology And Geophysics: Marine Sediments-Processes And Transport, Marine Geology And Geophysics: Midocean Ridge Processes, Marine Geology And Geophysics: Plate Tectonics (8150, 8155, 8157, 8158), Exploration Geophysics: Oceanic Structures

Scientific paper

The first continuous multichannel seismic profile to investigate the deeper structure of the western Nansen Basin was acquired in 2001 with the German and US icebreakers RV Polarstern and USCGC Healy. The 550-km long profile provides detailed insight into the deeper structure of this part of the Arctic Ocean. The sediments are up to 4.5 km thick close to the North Svalbard margin. The sediments thin continuously towards the north. The topography of the oceanic basement in the Nansen Basin is very rough, and it crops out north of 84°43'N 22°05'E. Here, it prevents the deposition of thicker sediment units. The rift valley of the Gakkel Ridge, with water depths around 4830 m, was crossed at 85°36'N 16°41'E. The top of the basement along the profile can be fit by a theoretical subsidence curve. In the Amundsen Basin, sediments are only 1.7-2.0 km thick and oceanic basement younger than chron 13 shallows abruptly some 100 km north of the median valley. The contrasting basement structures are related in our interpretation to the differing depositional histories of the two basins, and to asymmetric spreading in Cenozoic times.

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