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Late Wisconsinan grounding-zone wedges, northwestern Gulf of St Lawrence, eastern Canada

P. Lajeunesse
Geological Society, London, Memoirs, 46, 227-228, 30 November 2016, https://doi.org/10.1144/M46.91
P. Lajeunesse
Département de Géographie et Centre d’Études Nordiques, Université Laval, Québec, Quebec GIV 0A6, Canada (e-mail: )
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  • For correspondence: patrick.lajeunesse@ggr.ulaval.ca
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Grounding-zone wedges (GZWs) are formed on high-latitude continental shelves by the accumulation of subglacial sediments from fast-flowing ice at the grounding zone of an ice sheet during temporary stillstands (e.g. Mosola & Anderson 2006; Dowdeswell & Fugelli 2012; Batchelor & Dowdeswell 2015). GZWs are therefore recognized to record phases of episodic ice-sheet retreat (Dowdeswell et al. 2008). The morphology and distribution of a series of GZWs mapped using high-resolution multibeam sonar and airgun seismic data in the northwestern Gulf of St Lawrence, eastern Canada, are described here (Fig. 1a–d). These ice-contact submarine landforms were deposited when the marine-based southeastern margin of the Laurentide Ice Sheet stabilized for a few decades to centuries during its rapid retreat through the Gulf of St Lawrence.

Fig. 1.

Grounding-zone wedges (GZW) in the northwestern Gulf of St Lawrence, eastern Canada. (a) Location of study area (red box; map from GEBCO_08). (b) Oblique view of grounding-zone wedge at 180 m water depth (GZW 1) illustrating circular depressions along its steeper down-ice slope. (c) Seismic-reflection profile with two GZWs. Seismic profile shows bedrock surface which consists of gently dipping monoclinal Middle Ordovician sedimentary rocks of the St Lawrence Platform (Sanford 1993). Profile is located …

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Geological Society, London, Memoirs: 46 (1)
Geological Society, London, Memoirs
Volume 46
2016
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Late Wisconsinan grounding-zone wedges, northwestern Gulf of St Lawrence, eastern Canada

P. Lajeunesse
Geological Society, London, Memoirs, 46, 227-228, 30 November 2016, https://doi.org/10.1144/M46.91
P. Lajeunesse
Département de Géographie et Centre d’Études Nordiques, Université Laval, Québec, Quebec GIV 0A6, Canada (e-mail: )
  • Find this author on Google Scholar
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  • For correspondence: patrick.lajeunesse@ggr.ulaval.ca

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Late Wisconsinan grounding-zone wedges, northwestern Gulf of St Lawrence, eastern Canada

P. Lajeunesse
Geological Society, London, Memoirs, 46, 227-228, 30 November 2016, https://doi.org/10.1144/M46.91
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