Icebergs rework shelf sediments to 500 m off Antarctica

Research Article| December 01, 1988 Icebergs rework shelf sediments to 500 m off Antarctica Peter W. Barnes; Peter W. Barnes 1U.S. Geological Survey, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar Reidar Lien Reidar Lien 2Reidar Lien A/S, Øwe Flatåsv. 10, N-7079 Flatås, Norway Search for other works by this author on: GSW Google Scholar Author and Article Information Peter W. Barnes 1U.S. Geological Survey, Menlo Park, California 94025 Reidar Lien 2Reidar Lien A/S, Øwe Flatåsv. 10, N-7079 Flatås, Norway Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1988) 16 (12): 1130–1133. https://doi.org/10.1130/0091-7613(1988)016<1130:IRSSTM>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Peter W. Barnes, Reidar Lien; Icebergs rework shelf sediments to 500 m off Antarctica. Geology 1988;; 16 (12): 1130–1133. doi: https://doi.org/10.1130/0091-7613(1988)016<1130:IRSSTM>2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract Icebergs and sea ice rework the sediments of high-latitude shelves, producing modern diamicts (ice-keel turbates) unrelated to glacial proximity. Off Antarctica, sidescan sonar data indicate the presence of ice-gouge features formed by the physical interaction between ice keels and the sea bed. These are recognized as incisions a few metres deep and tens of metres wide, in water depths up to 500 m. On the submarine bank tops and slopes off Wilkes Land and in the Weddell Sea, subcircular depressions 30 to 150 m in diameter, a washboard pattern, and hummocky bed features also represent iceberg-resting sites. The freshness of sea-bed morphology, nearby Holocene sediment ponding, and active hydraulic sedimentary processes indicate that the sea floor is being reworked by iceberg keels. Tabular iceberg drafts in excess of 330 m have been measured, and modeling studies suggest that nontabular iceberg drafts of 500 m are possible. We conclude that a modern ice-keel turbate deposit in the form of a poorly stratified diamicton is probably widespread on that part (54%) of the Antarctic shelf less than 500 m deep. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.