Large, buried glacial moraines revealed by TOPAS sub-bottom profiling, South Orkney Islands, South Atlantic Ocean
Subglacial and ice-marginal landforms produced during the Last Glacial Maximum and subsequent regional deglaciation become progressively more buried, especially when postglacial sedimentation rates are high. Sub-bottom profiling is usually used to examine the stratigraphy of submarine glacial deposi...
Published in: | Geological Society, London, Memoirs |
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Geological Society of London
2016
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Online Access: | http://nora.nerc.ac.uk/id/eprint/515708/ https://doi.org/10.1144/M46.47 |
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ftnerc:oai:nora.nerc.ac.uk:515708 2023-05-15T18:21:02+02:00 Large, buried glacial moraines revealed by TOPAS sub-bottom profiling, South Orkney Islands, South Atlantic Ocean Dickens, William A. Graham, A. G. C. Smith, James A. Dowdeswell, J. A. Dowdeswell, J.A. Canals, M. Jakobsson, M. Todd, B.J. Dowdeswell, E.K. Hogan, K.A. 2016 http://nora.nerc.ac.uk/id/eprint/515708/ https://doi.org/10.1144/M46.47 unknown Geological Society of London Dickens, William A.; Graham, A. G. C.; Smith, James A. orcid:0000-0002-1333-2544 Dowdeswell, J. A. 2016 Large, buried glacial moraines revealed by TOPAS sub-bottom profiling, South Orkney Islands, South Atlantic Ocean. In: Dowdeswell, J.A.; Canals, M.; Jakobsson, M.; Todd, B.J.; Dowdeswell, E.K.; Hogan, K.A. orcid:0000-0002-1256-8010 , (eds.) Atlas of submarine glacial landforms: modern, Quaternary and ancient. London, Geological Society of London, 251-252. (Geological Society Memoir, 46, 46). Publication - Book Section PeerReviewed 2016 ftnerc https://doi.org/10.1144/M46.47 2023-02-04T19:44:13Z Subglacial and ice-marginal landforms produced during the Last Glacial Maximum and subsequent regional deglaciation become progressively more buried, especially when postglacial sedimentation rates are high. Sub-bottom profiling is usually used to examine the stratigraphy of submarine glacial deposits, but is only rarely exploited to visualize the topography beneath postglacial infill. By picking and gridding the basal reflector from a relatively dense network (spacing of <1.5 km) of TOPAS parametric sub-bottom profiles, we visualize both the modern seafloor of Orwell Trough, South Orkney (SO) Islands, and reconstruct the glacial landforms buried beneath up to c. 54 m of subsequent fine-grained sedimentation (Fig. 1). Based on accompanying sedimentological evidence and the shallow acoustic stratigraphy, the basal reflector is interpreted as the upper surface of either a subglacial till or coarse-grained ice-proximal debris (Fig. 1d). Book Part South Atlantic Ocean South Orkney Islands Natural Environment Research Council: NERC Open Research Archive Orwell ENVELOPE(-45.417,-45.417,-60.733,-60.733) South Orkney Islands ENVELOPE(-45.500,-45.500,-60.583,-60.583) Geological Society, London, Memoirs 46 1 251 252 |
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Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
unknown |
description |
Subglacial and ice-marginal landforms produced during the Last Glacial Maximum and subsequent regional deglaciation become progressively more buried, especially when postglacial sedimentation rates are high. Sub-bottom profiling is usually used to examine the stratigraphy of submarine glacial deposits, but is only rarely exploited to visualize the topography beneath postglacial infill. By picking and gridding the basal reflector from a relatively dense network (spacing of <1.5 km) of TOPAS parametric sub-bottom profiles, we visualize both the modern seafloor of Orwell Trough, South Orkney (SO) Islands, and reconstruct the glacial landforms buried beneath up to c. 54 m of subsequent fine-grained sedimentation (Fig. 1). Based on accompanying sedimentological evidence and the shallow acoustic stratigraphy, the basal reflector is interpreted as the upper surface of either a subglacial till or coarse-grained ice-proximal debris (Fig. 1d). |
author2 |
Dowdeswell, J.A. Canals, M. Jakobsson, M. Todd, B.J. Dowdeswell, E.K. Hogan, K.A. |
format |
Book Part |
author |
Dickens, William A. Graham, A. G. C. Smith, James A. Dowdeswell, J. A. |
spellingShingle |
Dickens, William A. Graham, A. G. C. Smith, James A. Dowdeswell, J. A. Large, buried glacial moraines revealed by TOPAS sub-bottom profiling, South Orkney Islands, South Atlantic Ocean |
author_facet |
Dickens, William A. Graham, A. G. C. Smith, James A. Dowdeswell, J. A. |
author_sort |
Dickens, William A. |
title |
Large, buried glacial moraines revealed by TOPAS sub-bottom profiling, South Orkney Islands, South Atlantic Ocean |
title_short |
Large, buried glacial moraines revealed by TOPAS sub-bottom profiling, South Orkney Islands, South Atlantic Ocean |
title_full |
Large, buried glacial moraines revealed by TOPAS sub-bottom profiling, South Orkney Islands, South Atlantic Ocean |
title_fullStr |
Large, buried glacial moraines revealed by TOPAS sub-bottom profiling, South Orkney Islands, South Atlantic Ocean |
title_full_unstemmed |
Large, buried glacial moraines revealed by TOPAS sub-bottom profiling, South Orkney Islands, South Atlantic Ocean |
title_sort |
large, buried glacial moraines revealed by topas sub-bottom profiling, south orkney islands, south atlantic ocean |
publisher |
Geological Society of London |
publishDate |
2016 |
url |
http://nora.nerc.ac.uk/id/eprint/515708/ https://doi.org/10.1144/M46.47 |
long_lat |
ENVELOPE(-45.417,-45.417,-60.733,-60.733) ENVELOPE(-45.500,-45.500,-60.583,-60.583) |
geographic |
Orwell South Orkney Islands |
geographic_facet |
Orwell South Orkney Islands |
genre |
South Atlantic Ocean South Orkney Islands |
genre_facet |
South Atlantic Ocean South Orkney Islands |
op_relation |
Dickens, William A.; Graham, A. G. C.; Smith, James A. orcid:0000-0002-1333-2544 Dowdeswell, J. A. 2016 Large, buried glacial moraines revealed by TOPAS sub-bottom profiling, South Orkney Islands, South Atlantic Ocean. In: Dowdeswell, J.A.; Canals, M.; Jakobsson, M.; Todd, B.J.; Dowdeswell, E.K.; Hogan, K.A. orcid:0000-0002-1256-8010 , (eds.) Atlas of submarine glacial landforms: modern, Quaternary and ancient. London, Geological Society of London, 251-252. (Geological Society Memoir, 46, 46). |
op_doi |
https://doi.org/10.1144/M46.47 |
container_title |
Geological Society, London, Memoirs |
container_volume |
46 |
container_issue |
1 |
container_start_page |
251 |
op_container_end_page |
252 |
_version_ |
1766200063054315520 |