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Late Quaternary Glacial History of the South Orkney Plateau, Antarctica

Published online by Cambridge University Press:  20 January 2017

Margaret J. Herron  and
John B. Anderson
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Abstract

Piston cores from the South Orkney Plateau penetrated overcompacted diamictons in water depths of up to 250 m. Detailed textural and petrological analyses of these diamictons indicate that they are basal tills. Seismic records from the plateau show a widespread surface of glacial erosion and provide additional evidence of an ice cap grounded to a depth of 250 m. Piston cores from the slope of the plateau penetrated diatomaceous muds resting directly on poorly sorted muds with very little to no biogenic material. The ice-rafted debris in these glacial-marine sediments is composed almost exclusively of material derived from the South Orkney Islands. This implies deposition beneath an ice shelf as opposed to iceberg rafting. In contrast, diatomaceous muds contain relatively abundant exotic iceberg-rafted material and reflect a glacial-maritime setting similar to that of today. The sharp contact separating diatomaceous surface sediments from basal tills and sub-ice shelf deposits indicates that the ice cap and ice shelf retreated from the plateau rapidly. Radiocarbon dates for diatomaceous muds from a glacial trough on the plateau indicate that the ice cap and ice shelf retreated from the plateau prior to 6000 to 7000 years ago. The homogeneity of surficial diatomaceous sediments suggests that sea ice conditions over the plateau have not changed radically since that time.

Type
Articles
Information
Quaternary Research , Volume 33 , Issue 3 , May 1990 , pp. 265 - 275
Copyright
University of Washington

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References

Anderson, J. B. Brake, C. F. Meyers, N. C. Sedimentation on the Ross Sea continental shelf, Antarctica. Marine Geology 57 1984 295 333 Google Scholar
Anderson, J. B. Kurtz, D. D. Domack, E. W. Balshaw, K. M. Glacial and glacial marine sediments on the Antarctic continental shelf. Journal of Geology 88 1980 399 414 Google Scholar
DeFelice, D. R. Wise, S. W. Surface lithofacies, biofacies, and diatom diversity patterns as models for delineation of climate change in the Southeast Atlantic Ocean. Marine Micropaleontology 6 1981 29 70 Google Scholar
Denton, G. H. Hughes, T. J. Potential influence of floating ice shelves on the climate of an ice age. South African Journal of Science 82 1986 509 513 Google Scholar
Domack, E. W. Sedimentology of glacial and glacial marine deposits on the George V-Adelie continental shelf, East Antarctica. Boreas 11 1982 79 97 Google Scholar
Domack, E. W. Jull, A. J. T. Anderson, J. B. Linick, T. W. Williams, C. R. Application of tandem accelerator mass-spectrometer dating to late Pleistocene-Holocene sediments of the East Antarctic continental shelf. Quaternary Research 31 1989 277 287 Google Scholar
Drewry, D. J. Cooper, A. P. Processes and models of Antarctic glaciomarine sedimentation. Annals of Glaciology 2 1981 117 122 Google Scholar
Elverhoi, A. Evidence of a late Wisconsin glaciation of the Weddell Sea. Nature (London) 293 1981 641 642 Google Scholar
Hall, K. A reconstruction of the Quaternary ice cover on Marion Island Oliver, R. L. James, P. R. Jago, J. B. Antarctic Earth Science 1983 Australian Academy of Science Canberra 461 464 Google Scholar
Hall, K. Evidence in favour of an extensive ice cover on sub-Antarctic Kerguelen Island during the last glacial. Palaeogeography, Palaeoclimatology, Palaeoecology 47 1984 225 232 Google Scholar
Harrington, P. K. A Geophysical Survey near the South Orkney Islands. Unpublished PhD Thesis 1968 University of Birmingham Google Scholar
Hughes, T. J. Numerical reconstruction of paleo-ice sheets Denton, G. H. Hughes, T. J. The Last Great Ice Sheets 1981 Wiley New York 222 260 Google Scholar
Jacobs, S. S. Gordon, A. L. Ardai, J. L. Circulation and melting beneath the Ross Ice Shelf. Science 203 1979 429 442 Google Scholar
Johnson, R. G. Andrews, J. T. Glacial terminations in the oxygen isotope record of deep sea cores: Hypothesis of massive Antarctic ice-shelf destruction. Palaeogeography, Palaeoclimatology, Palaeoecology 53 1986 107 138 CrossRefGoogle Scholar
Kellogg, T. B. Truesdale, R. S. Osterman, L. E. Late Quaternary extent of the West Antarctic Ice Sheet, new evidence from Ross Sea cores. Geology 7 1979 249 253 Google Scholar
Kennedy, D. S. Anderson, J. B. Quaternary glacial history of Marguerite Bay, Antarctic Peninsula. Quaternary Research 31 1989 255 276 Google Scholar
Kohnen, H. Glaciological investigations in the frontal zone of the Filchner and Ronne Ice Shelves. Annals of Glaciology 3 1982 160 165 CrossRefGoogle Scholar
Mabin, M. C. G. 14C ages for “Heroic Era” penguin and seal remains from Cape Evans, McMurdo Sound, New Zealand. New Zealand Antarctic Record 7 1985 19 20 Google Scholar
Robin, G.De Q. Formation, flow, and disintegration of ice shelves. Journal of Glaciology 24 1979 259 271 Google Scholar
Schwerdtferger, W. Weather and Climate of the Antarctic: Developments in Atmospheric Science 1984 Elsevier New York 257 Google Scholar
Stuiver, M. Denton, G. H. Hughes, T. J. Fastook, J. L. History of the marine ice sheet in West Antarctica during the last glaciation: A working hypothesis Denton, G. H. Hughes, T. J. The Last Great Ice Sheets 1981 Wiley New York 319 439 Google Scholar
Stuiver, M. Ostlund, H. G. GEOSECS Atlantic Radiocarbon. Radiocarbon 22 1980 1 24 CrossRefGoogle Scholar
Sugden, D. E. Clapperton, C. M. The maximum ice extent on island groups in the Scotia Sea, Antarctica. Quaternary Research 7 1977 268 282 Google Scholar
Thomas, R. H. Dynamics of marine ice sheets. Journal of Glaciology 24 1979 167 177 Google Scholar
Thomson, J. W. The geology of the South Orkney Islands. III. Coronation Island. British Antarctic Survey Scientific Report 86 1974 Google Scholar