Assemblage of buried and seabed tunnel valleys in the central North Sea: from morphology to ice-sheet dynamics
Tunnel valleys are kilometre-scale, channel-like, incised subglacial landforms usually associated with glaciated lowlands (Ó Cofaigh 1996). Tunnel valleys related to the Pleistocene glaciations are present onshore and offshore of NW Europe (e.g. Huuse & Lykke-Andersen 2000; Van der Vegt et al. 2...
| Published in: | Geological Society, London, Memoirs |
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| Format: | Book Part |
| Language: | English |
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Geological Society of London
2016
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| Online Access: | http://nora.nerc.ac.uk/id/eprint/515869/ https://nora.nerc.ac.uk/id/eprint/515869/1/M_Stewart_tunnel_valleys_assemblage_241115.pdf https://doi.org/10.1144/M46.140 |
| Summary: | Tunnel valleys are kilometre-scale, channel-like, incised subglacial landforms usually associated with glaciated lowlands (Ó Cofaigh 1996). Tunnel valleys related to the Pleistocene glaciations are present onshore and offshore of NW Europe (e.g. Huuse & Lykke-Andersen 2000; Van der Vegt et al. 2012). In the central North Sea, tunnel valleys are found buried in the Quaternary succession and as bathymetric deeps at the seabed. Three-dimensional (3D) seismic data from the central North Sea image extensive networks of buried tunnel valleys that consist of multiple generations of cross-cutting landforms (Stewart et al. 2013). Seabed tunnel valleys are identified in high-resolution bathymetric data, and form another set of younger glacial landforms. Morphological measurements of the buried and seabed tunnel valleys are compared to infer their relationship to past ice-margins and highlight the differences in ice-sheet configuration over time. |
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