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Unusual iceberg ploughmarks on the Norwegian continental shelf

L. R. Bjarnadóttir, D. Ottesen, J. A. Dowdeswell and T. Bugge
Geological Society, London, Memoirs, 46, 283-284, 30 November 2016, https://doi.org/10.1144/M46.126
L. R. Bjarnadóttir
1Geological Survey of Norway, Postboks 6315 Sluppen, N-7491 Trondheim, Norway
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  • For correspondence: lilja.bjarnadottir@ngu.no
D. Ottesen
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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T. Bugge
3Det Norske Oljeselskap ASA, Munkegata 26, N-7011 Trondheim, Norway
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Iceberg ploughmarks are produced when the keels of drifting icebergs impinge upon and cut into seafloor sediments. They are common landforms of high-latitude shelves and fjords, especially in water shallower than about 500 m where they are easily detected using modern multibeam echo-sounding and earlier side-scan sonar systems (e.g. Lien 1983; Dowdeswell et al. 1993). In addition, similar buried morphological features have been imaged within Quaternary sediments on palaeo-shelves using 3D seismic methods (e.g. Dowdeswell & Ottesen 2013).

Description

Five examples of unusual linear to curvilinear features from the seabed of the Norwegian continental shelf are presented (Fig. 1). The first and rather small feature is from outside Bråsvellbreen (Fig. 1a), an outlet glacier of Austfonna in E Svalbard. The looped feature is about 15 m wide and 1 m deep and has small berms on either side. The diameter of the loop is about 1.2 km. The feature is found on top of a dense criss-crossing pattern of similar features on the seafloor in water depths of around 40 m.

Fig. 1.

Iceberg ploughmarks on the Norwegian continental shelf and upper slope (located in (g)). (a) An almost-circular iceberg ploughmark outside Bråsvellbreen, Austfonna, Svalbard. (b) Peculiarly shaped iceberg ploughmark in the central Barents Sea. (c) Iceberg ploughmark demonstrating rotation, central Barents Sea. The many small round …

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Geological Society, London, Memoirs: 46 (1)
Geological Society, London, Memoirs
Volume 46
2016
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Unusual iceberg ploughmarks on the Norwegian continental shelf

L. R. Bjarnadóttir, D. Ottesen, J. A. Dowdeswell and T. Bugge
Geological Society, London, Memoirs, 46, 283-284, 30 November 2016, https://doi.org/10.1144/M46.126
L. R. Bjarnadóttir
1Geological 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
  • For correspondence: lilja.bjarnadottir@ngu.no
D. Ottesen
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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T. Bugge
3Det Norske Oljeselskap ASA, Munkegata 26, N-7011 Trondheim, Norway
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  • Find this author on PubMed
  • Search for this author on this site

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Unusual iceberg ploughmarks on the Norwegian continental shelf

L. R. Bjarnadóttir, D. Ottesen, J. A. Dowdeswell and T. Bugge
Geological Society, London, Memoirs, 46, 283-284, 30 November 2016, https://doi.org/10.1144/M46.126
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