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East Antarctic continental shelf: Prydz Bay and the Mac.Robertson Land Shelf

Citation

O'Brien, PE and Harris, PT and Post, AL and Young, N, East Antarctic continental shelf: Prydz Bay and the Mac.Robertson Land Shelf, Continental Shelves of the World Their Evolution During the Last Glacio-Eustatic Cycle, Geological Society, London, FL Chiocci, AR Chivas (ed), United Kingdom, pp. 241-254. ISBN 9781862396869 (2014) [Research Book Chapter]

Copyright Statement

Copyright 2014 The Geological Society of London

DOI: doi:10.1144/M41.18

Abstract

© The Geological Society of London 2014. Prydz Bay and the Mac.Robertson Land Shelf exhibit many of the variations seen on Antarctic continental shelves. The Mac.Robertson shelf is relatively narrow with rugged, inner-shelf topography and shallow outer-shelf banks swept by the westflowing Antarctic Coastal Current. U-shaped valleys cut across the shelf. It has thin sedimentary cover, deposited and eroded by cycles of glacial advance and retreat through the Neogene and Quaternary. Modern sedimentation is diatom-rich siliceous, muddy ooze in shelf deeps, while, on the banks, phytodetritus, calcareous bioclasts and terrigenous material are mixed by iceberg ploughing. Prydz Bay is a large embayment fed by the Amery Ice Shelf. It has a broad inner-shelf deep area and outer bank, with depths ranging from 2400 m beneath the ice shelf to 100 m on the outer banks. A clockwise gyre flows through the bay. Fine mud and siliceous ooze drape the seafloor; however, banks are scoured by icebergs to depths as great as 500 m. The Mac.Robertson shelf has seen advances to the shelf edge during glacial episodes and retreat during warming and rising sea level. Prydz Bay shows more complexity, with parts of the bay showing partial advance of the ice-grounding zone.

Item Details

Item Type:Research Book Chapter
Keywords:Antarctica, continental shelf, Prydz Bay
Research Division:Earth Sciences
Research Group:Physical Geography and Environmental Geoscience
Research Field:Glaciology
Objective Division:Environment
Objective Group:Other Environment
Objective Field:Antarctic and Sub-Antarctic Oceanography
Author:Young, N (Mr Neal Young)
ID Code:119300
Year Published:2014
Deposited By:CRC-Antarctic Climate & Ecosystems
Deposited On:2017-07-31
Last Modified:2017-10-16
Downloads:0

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