Accession Number : ADA258067


Title :   Sediment Flux, East Greenland Margin


Descriptive Note : Final rept. 1 Oct 1988-1 Sep 1991


Corporate Author : COLORADO UNIV AT BOULDER INST OF ARCTIC AND ALPINE RESEARCH


Personal Author(s) : Andrews, J T ; Williams, K M


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a258067.pdf


Report Date : 17 Sep 1991


Pagination or Media Count : 18


Abstract : 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.


Descriptors :   *SEDIMENT TRANSPORT , DENSITY , CORES , RESOLUTION , SURVEYS , GRAVITY , HIGH LATITUDES , GREENLAND SEA , FJORDS , GREENLAND , SEDIMENTS , ACOUSTICS , SHEETS , ICE , HIGH RESOLUTION , CONTINENTAL SHELVES


Subject Categories : Cartography and Aerial Photography


Distribution Statement : APPROVED FOR PUBLIC RELEASE