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Bedrock channels in Pine Island Bay, West Antarctica

F. O. Nitsche, R. D. Larter, K. Gohl, A. G. C. Graham and G. Kuhn
Geological Society, London, Memoirs, 46, 217-218, 30 November 2016, https://doi.org/10.1144/M46.1
F. O. Nitsche
1Lamont-Doherty Earth Observatory, Columbia University, Palisades, New York 10964, USA
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  • For correspondence: fnitsche@ldeo.columbia.edu
R. D. Larter
2British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK
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K. Gohl
3Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Am Alten Hafen 26, D-27568 Bremerhaven, Germany
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A. G. C. Graham
4College of Life and Environmental Sciences, University of Exeter, Rennes Drive, Exeter EX4 4RJ, UK
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G. Kuhn
3Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Am Alten Hafen 26, D-27568 Bremerhaven, Germany
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The seafloor of inner continental shelves on glaciated margins is sometimes stripped of most of the softer sediments, leaving bedrock exposed (Wellner et al. 2001). Examples of such exposed bedrock regions have been observed in the inner parts of several cross-shelf troughs on the West Antarctica margin, including those in the Amundsen Sea (Lowe & Anderson 2003; Graham et al. 2009) and Marguerite Bay (Anderson & Fretwell 2008). The detailed morphology of these areas consists of various features of glacial origin, predominantly parallel grooves or striations. These areas can also contain sinuous channels that are incised deeply into the rock substrate.

Description

Some prominent examples of channels eroded into exposed bedrock are found in Pine Island Bay in the Amundsen Sea, West Antarctica (Fig. 1a–c). The channels were first reported by Lowe & Anderson (2003). They exhibit a range of sizes and orientations. The largest channels are as deep as 400–500 m and as wide as 1000–2000 m (Fig. 1e). Secondary channels are up to 10–100 m deep and up to hundreds of metres wide. …

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Geological Society, London, Memoirs: 46 (1)
Geological Society, London, Memoirs
Volume 46
2016
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Bedrock channels in Pine Island Bay, West Antarctica

F. O. Nitsche, R. D. Larter, K. Gohl, A. G. C. Graham and G. Kuhn
Geological Society, London, Memoirs, 46, 217-218, 30 November 2016, https://doi.org/10.1144/M46.1
F. O. Nitsche
1Lamont-Doherty Earth Observatory, Columbia University, Palisades, New York 10964, USA
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: fnitsche@ldeo.columbia.edu
R. D. Larter
2British Antarctic Survey, Natural Environment Research Council, High Cross, Madingley Road, Cambridge CB3 0ET, UK
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
K. Gohl
3Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Am Alten Hafen 26, D-27568 Bremerhaven, Germany
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A. G. C. Graham
4College of Life and Environmental Sciences, University of Exeter, Rennes Drive, Exeter EX4 4RJ, UK
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G. Kuhn
3Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Am Alten Hafen 26, D-27568 Bremerhaven, Germany
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Bedrock channels in Pine Island Bay, West Antarctica

F. O. Nitsche, R. D. Larter, K. Gohl, A. G. C. Graham and G. Kuhn
Geological Society, London, Memoirs, 46, 217-218, 30 November 2016, https://doi.org/10.1144/M46.1
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