Seafloor morphology and acoustic facies of the George V Land shelf

Beaman, Robin J, and Harris, Peter T (2003) Seafloor morphology and acoustic facies of the George V Land shelf. Deep-sea Research. Part II: topical studies in oceanography, 50 (8-9). pp. 1343-1355.

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Abstract

To study the seafloor morphology on the George V Land shelf, East Antarctica, over 2000km of high-frequency 3.5-27 kHz, echo-sounder data were collected between February and March 2000. The shelf can be divided into four acoustic facies: (a) Type IA-2 seabed is ice-keel turbate found on mid- to outer-shelf banks on seafloor less than 500m deep; (b) Type IB seabed is siliceous mud and diatom ooze drift, drape and fill deposits within the George V Basin between 750 and 850m depth; (c) Type IIB seabed is smooth diamicton below 500m depth, and occasionally has lowrelief megaflutes or ridge and swale features; (d) Type IIIC seabed is high relief ridges and canyons from the coast to the deepest part of the George V Basin. The acoustic facies are explained in terms of glacial and oceanographic influences on the shelf since the Last Glacial Maximum.

Item ID: 1038
Item Type: Article (UNSPECIFIED)
ISSN: 0967-0645
Keywords: Geomorphology, Glacier, Sediment, Antarctica
Additional Information:

© 2003 Elsevier. : This journal is available online - use hypertext links above.

Date Deposited: 06 Nov 2006
FoR Codes: 04 EARTH SCIENCES > 0406 Physical Geography and Environmental Geoscience > 040601 Geomorphology and Regolith and Landscape Evolution @ 0%
04 EARTH SCIENCES > 0403 Geology > 040310 Sedimentology @ 0%
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