Seafloor morphology and acoustic facies of the George V Land shelf
To study the seafloor morphology on the George V Land shelf, East Antarctica, over 2000 km 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 out...
| Published in: | Deep Sea Research Part II: Topical Studies in Oceanography |
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| Main Authors: | , |
| Format: | Article in Journal/Newspaper |
| Language: | English |
| Published: |
Pergamon-Elsevier Science Ltd
2003
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| Subjects: | |
| Online Access: | https://doi.org/10.1016/S0967-0645(03)00071-7 http://ecite.utas.edu.au/28235 |
| Summary: | To study the seafloor morphology on the George V Land shelf, East Antarctica, over 2000 km 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 seaftoor less than 500 m deep; (b) Type IB seabed is siliceous mud and diatom ooze drift, drape and fill deposits within the George V Basin between 750 and 850 m depth; (c) Type IIB seabed is smooth diamicton below 500 m depth, and occasionally has low-relief 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. 2003 Elsevier Science Ltd. All rights reserved. |
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