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Crescentic submarine hills and holes produced by iceberg calving and rotation

E. L. King, L. Rise and V. K. Bellec
Geological Society, London, Memoirs, 46, 267-268, 30 November 2016, https://doi.org/10.1144/M46.119
E. L. King
1Geological Survey of Canada, Natural Resources Canada, PO Box 1006, Dartmouth, Nova Scotia B2Y 4A2, Canada
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  • For correspondence: Edward.King@canada.ca
L. Rise
2Geological Survey of Norway, Postboks 6315 Sluppen, N-7491 Trondheim, Norway
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V. K. Bellec
2Geological Survey of Norway, Postboks 6315 Sluppen, N-7491 Trondheim, Norway
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Late Weichselian maximum ice covered the entire Barents Sea continental shelf and a major ice stream delivered large amounts of glacial debris to the western slope (Fig. 1a). During deglaciation, one of several dynamic components of the ice sheet occupied Djuprenna, a glacially eroded trough offshore of the northernmost coast of mainland Norway (Fig. 1a). Mega-scale glacial lineations (MSGLs) indicate major ice flow when the main ice source had shifted eastwards and most of the SW Barents Sea was ice free (e.g. Ottesen et al. 2008). Spectacular seabed pits with adjacent crescentic hills are imaged on multibeam bathymetry of Djuprenna. Although morphologically similar to hill–hole pairs formed by glacitectonic processes (e.g. Sættem 1990) some critical differences suggest another genesis. Seafloor features of this type are probably uncommon and, to our knowledge, have not been described previously.

Fig. 1.

Images, metrics and interpretation of a field of over 60 hill–hole pairs located in the glacial trough, Djuprenna. (a) Location of study area (red box; map from GEBCO_08). Sun-illuminated multibeam-bathymetric images depict their morphological variation: (b) a non-crescentic hill; (c) a doublet with MSGLs; (d) adjoining but mirrored hills; (e) very concentric hill, up-ice side; (f) typical form; (g) hole both sides, hill convex down-ice; (h) no hole (infilled); (i) hole both sides, current scour-related, convex up-ice; (j) largest form, convex down-ice. Acquisition system Kongsberg EM1002. …

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Geological Society, London, Memoirs: 46 (1)
Geological Society, London, Memoirs
Volume 46
2016
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Crescentic submarine hills and holes produced by iceberg calving and rotation

E. L. King, L. Rise and V. K. Bellec
Geological Society, London, Memoirs, 46, 267-268, 30 November 2016, https://doi.org/10.1144/M46.119
E. L. King
1Geological Survey of Canada, Natural Resources Canada, PO Box 1006, Dartmouth, Nova Scotia B2Y 4A2, Canada
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: Edward.King@canada.ca
L. Rise
2Geological Survey of Norway, Postboks 6315 Sluppen, N-7491 Trondheim, Norway
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
V. K. Bellec
2Geological Survey of Norway, Postboks 6315 Sluppen, N-7491 Trondheim, Norway
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site

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Crescentic submarine hills and holes produced by iceberg calving and rotation

E. L. King, L. Rise and V. K. Bellec
Geological Society, London, Memoirs, 46, 267-268, 30 November 2016, https://doi.org/10.1144/M46.119
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