Sediment flux, east Greenland margin. Final report, 1 October 1988-1 September 1991
We investigated sediment flux across an ice-dominated, high latitude continental margin, using cores from the East Greenland Shelf (ca. 68 deg N). Density, weight percentages of the various sediment components, and sediment/age relations (AMS C- 14 dates) were investigated from cores collected 1988 and 1990. High-resolution DTS Huntec surveys indicated 10-20 m of acoustically transparent sediment. Maximum core length was 3 m and most of the gravity cores were between 1-2 m. The radiocarbon assays show that basal core sediments date between ca. 9,000 and 14,500 BP. The acoustic characteristics, the low dry volume densities (ca. 600 kg/m3 and the faunal and floral assemblages) suggest ice-distal conditions between ca. 14,500 and the present. Net sediment flux in the Kangerdlugssuaq Trough during the last 14,500 years has been low; this might be explained by either (1) cold-based glaciological conditions of the East Greenland ice sheet; and/or (2) efficient sediment trap(s) lying along the inner shelf/fjords of East Greenland.
- Research Organization:
- Colorado Univ., Boulder, CO (United States). Inst. of Arctic and Alpine Research
- OSTI ID:
- 6731862
- Report Number(s):
- AD-A-258067/8/XAB; CNN: N00014-89-J-1013
- Country of Publication:
- United States
- Language:
- English
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