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Bouldery debris mantle deposited by cold-based ice offshore of the Vestfold Hills, East Antarctica

P. E. O'Brien, J. Smith and M. Riddle
Geological Society, London, Memoirs, 46, 115-116, 30 November 2016, https://doi.org/10.1144/M46.48
P. E. O'Brien
1Department of Environmental Sciences, Macquarie University, Sydney, New South Wales 2109, Australia
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J. Smith
2Geoscience Australia, GPO Box 378, Canberra ACT 2601, Australia
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M. Riddle
3Australian Antarctic Division, Channel Highway, Kingston, Tasmania 7050, Australia
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Streamlined subglacial sediments are common in seafloor bathymetric images from many glaciated margins. Less common are seafloor features left by cold-based ice. The shallow waters around the now largely ice-free Vestfold Hills in East Antarctica (Fig. 1a, e) show few streamlined sedimentary features, even though the area has clearly been glaciated as implied by striated bedrock, moraine ridges and abundant erratic boulders on adjacent exposed land. A likely explanation for the absence of streamlined subglacial landforms is that the area was glaciated by ice frozen to its bed.

Fig. 1.

Multibeam swath bathymetry, outcrop photo and topographic profiles of boulder-rich debris mantle and sand ribbons from the Vestfold Hills coastal zone, East Antarctica. (a) Sun-illuminated bathymetric image of Airport Beach Embayment showing the debris mantle. Ice-keel ploughmarks are shown outside the embayment. Acquisition system Kongsberg EM3002. Frequency 300 kHz. Grid-cell size 2 m. (b) Close-up of debris mantle showing individual boulders. (c) Photograph of bouldery debris mantle above sea level. Large boulder is 4 m in diameter. (d) Multibeam image of sand ribbons and boulders. (e) Location of study area (red …

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Geological Society, London, Memoirs: 46 (1)
Geological Society, London, Memoirs
Volume 46
2016
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Bouldery debris mantle deposited by cold-based ice offshore of the Vestfold Hills, East Antarctica

P. E. O'Brien, J. Smith and M. Riddle
Geological Society, London, Memoirs, 46, 115-116, 30 November 2016, https://doi.org/10.1144/M46.48
P. E. O'Brien
1Department of Environmental Sciences, Macquarie University, Sydney, New South Wales 2109, Australia
  • Find this author on Google Scholar
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  • Search for this author on this site
  • For correspondence: phil.obrien.ant@gmail.com
J. Smith
2Geoscience Australia, GPO Box 378, Canberra ACT 2601, Australia
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M. Riddle
3Australian Antarctic Division, Channel Highway, Kingston, Tasmania 7050, Australia
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Bouldery debris mantle deposited by cold-based ice offshore of the Vestfold Hills, East Antarctica

P. E. O'Brien, J. Smith and M. Riddle
Geological Society, London, Memoirs, 46, 115-116, 30 November 2016, https://doi.org/10.1144/M46.48
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