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Eskers formed at the beds of modern surge-type tidewater glaciers in Spitsbergen

J. A. Dowdeswell and D. Ottesen
Geological Society, London, Memoirs, 46, 83-84, 30 November 2016, https://doi.org/10.1144/M46.70
J. A. Dowdeswell
1Scott Polar Research Institute, University of Cambridge, Cambridge CB2 1ER, UK
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  • For correspondence: jd16@cam.ac.uk
D. Ottesen
2Geological Survey of Norway, Postboks 6315 Sluppen, N-7491 Trondheim, Norway
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Eskers are sinuous ridges composed of glacifluvial sand and gravel. They are deposited in channels with ice walls in subglacial, englacial and supraglacial positions. Eskers have been observed widely in deglaciated terrain and are varied in their planform. Many are single continuous ridges, whereas others are complex anastomosing systems and some are successive subaqueous fans deposited at retreating tidewater glacier margins (Benn & Evans 2010). Eskers are usually orientated approximately in the direction of past glacier flow. When basal water flows under pressure in full conduits, the hydraulic gradient and direction of water flow are controlled primarily by ice-surface slope, with bed topography of secondary importance (Shreve 1985). In such cases, eskers typically record the former flow of channelized and pressurized water both up- and downslope.

Description

Sinuous sedimentary ridges, orientated generally parallel to fjord long-axes, have been observed on swath-bathymetric images from several Spitsbergen fjords (Ottesen et al. 2008). In Rindersbukta, innermost van Mijenfjorden, and van Keulenfjorden in central Spitsbergen, the fjord floors have been exposed by glacier retreat over the past century or so (Ottesen et al. 2008). Sinuous sedimentary ridges occur within …

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Geological Society, London, Memoirs: 46 (1)
Geological Society, London, Memoirs
Volume 46
2016
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Eskers formed at the beds of modern surge-type tidewater glaciers in Spitsbergen

J. A. Dowdeswell and D. Ottesen
Geological Society, London, Memoirs, 46, 83-84, 30 November 2016, https://doi.org/10.1144/M46.70
J. A. Dowdeswell
1Scott Polar Research Institute, University of Cambridge, Cambridge CB2 1ER, UK
  • Find this author on Google Scholar
  • Find this author on PubMed
  • Search for this author on this site
  • For correspondence: jd16@cam.ac.uk
D. Ottesen
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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Eskers formed at the beds of modern surge-type tidewater glaciers in Spitsbergen

J. A. Dowdeswell and D. Ottesen
Geological Society, London, Memoirs, 46, 83-84, 30 November 2016, https://doi.org/10.1144/M46.70
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