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Possible ‘lift-off moraines’ at grounded ice-sheet margins, North Norwegian shelf edge

S. Elvenes and J. A. Dowdeswell
Geological Society, London, Memoirs, 46, 247-248, 30 November 2016, https://doi.org/10.1144/M46.26
S. Elvenes
1Geological Survey of Norway, Postboks 6315 Sluppen, N-7491 Trondheim, Norway
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J. A. Dowdeswell
2Scott Polar Research Institute, University of Cambridge, Cambridge CB2 1ER, UK
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Small but regular variations in ice-sheet horizontal velocity have been linked to buoyancy-related tidal forcing beneath modern Antarctic ice streams (e.g. Bindschadler et al. 2003; Gudmundsson 2006). Given this sensitivity to tidal amplitudes of only a metre or two, it is likely that grounding zones at the tidewater margins of Quaternary ice sheets were also affected by buoyancy changes linked to tides. Ottesen & Dowdeswell (2009) observed a linear belt of irregular hummocky seafloor terrain at the full-glacial margin of a grounded Late Quaternary ice sheet at the NW Spitsbergen shelf edge. They proposed that this distinctive morphology might be linked to buoyancy fluctuations at this former grounding zone. We describe and interpret extensive belts of similar hummocky terrain from the margins of a full-glacial ice sheet at the North Norwegian shelf edge.

Description

Between 68° 50′ N and 69° 25′ N, the Norwegian continental shelf narrows to about 30 km off Vesterålen archipelago. This area comprises shallow banks (40–120 m deep) and is understood to have been located between fast-flowing ice streams in the Late Weichselian Ice Sheet; it is therefore likely to have experienced limited ice flow. Within 6 km of the shelf edge, belts of hummocky, undulating ridges are found both on banks (Fig. 1) and in shallower parts of adjacent troughs. The ridges occur at water-depths of 85–160 m, and …

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Geological Society, London, Memoirs: 46 (1)
Geological Society, London, Memoirs
Volume 46
2016
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Possible ‘lift-off moraines’ at grounded ice-sheet margins, North Norwegian shelf edge

S. Elvenes and J. A. Dowdeswell
Geological Society, London, Memoirs, 46, 247-248, 30 November 2016, https://doi.org/10.1144/M46.26
S. Elvenes
1Geological Survey of Norway, Postboks 6315 Sluppen, N-7491 Trondheim, Norway
  • Find this author on Google Scholar
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  • Search for this author on this site
  • For correspondence: sigrid.elvenes@ngu.no
J. A. Dowdeswell
2Scott Polar Research Institute, University of Cambridge, Cambridge CB2 1ER, UK
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Possible ‘lift-off moraines’ at grounded ice-sheet margins, North Norwegian shelf edge

S. Elvenes and J. A. Dowdeswell
Geological Society, London, Memoirs, 46, 247-248, 30 November 2016, https://doi.org/10.1144/M46.26
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