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Possible Interglacial Dune Sands from 300 Meters Water Depth in the Weddell Sea, Antarctica

1970; Geological Society of America; Volume: 81; Issue: 11 Linguagem: Inglês

10.1130/0016-7606(1970)81[3465

1943-2674

R.W. Rex, Stanley V. Margolis, Betty Murray,

Aeolian processes and effects

Research Article| November 01, 1970 Possible Interglacial Dune Sands from 300 Meters Water Depth in the Weddell Sea, Antarctica ROBERT W REX; ROBERT W REX University of California, Riverside, California 92502 Search for other works by this author on: GSW Google Scholar STANLEY V MARGOLIS; STANLEY V MARGOLIS University of California, Riverside, California 92502 Search for other works by this author on: GSW Google Scholar BETTY MURRAY BETTY MURRAY University of California, Riverside, California 92502 Search for other works by this author on: GSW Google Scholar Author and Article Information ROBERT W REX University of California, Riverside, California 92502 STANLEY V MARGOLIS University of California, Riverside, California 92502 BETTY MURRAY University of California, Riverside, California 92502 Publisher: Geological Society of America Received: 29 Jun 1970 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1970, The Geological Society of America, Inc. Copyright is not claimed on any material prepared by U.S. government employees within the scope of their employment. GSA Bulletin (1970) 81 (11): 3465–3472. https://doi.org/10.1130/0016-7606(1970)81[3465:PIDSFM]2.0.CO;2 Article history Received: 29 Jun 1970 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation ROBERT W REX, STANLEY V MARGOLIS, BETTY MURRAY; Possible Interglacial Dune Sands from 300 Meters Water Depth in the Weddell Sea, Antarctica. GSA Bulletin 1970;; 81 (11): 3465–3472. doi: https://doi.org/10.1130/0016-7606(1970)81[3465:PIDSFM]2.0.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 SocietyGSA Bulletin Search Advanced Search Abstract A suite of orange-peel grab sediment samples collected during Deep Freeze II from the Antarctic continental shelf of the Weddell Sea contained several well-sorted sand samples. These were collected in 1957 from Berkner Bank in water depths of 282 to 300 m. Samples from greater and lesser depths show poorer sorting as well as differences in other size parameters (Fig. 1). The well-sorted sands include both striated and fractured quartz grains with a considerable degree of polish. Photographs and electron micrographs of grain surfaces and replicas suggest that entire grain surfaces of both the fractured surface morphology and the polished surface have undergone quartz dissolution suggesting an extensive period of exposure to seawater. Detailed studies show features characteristic of both beach and dune sand abrasion overlying glacial features.A variable amount of rock flour is present in all samples, but is least abundant in the 290 ± 10m depth samples. The samples from depths both greater and less than 290 ± 10 m appear to be typical of periglacial marine sediments with a poorly sorted heterogeneous assortment of minerals and rock fragments. The 290 ± 10 m samples appear strikingly different and strongly resemble quartz dune or beach sands. The very good sorting, size, and surface features suggest that these are dune sands.These data indicate that Berkner Bank may have been exposed at the surface during an interglacial period when the Antarctic land surface stood approximately 300 m higher with respect to sea level than it does today. 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.