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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Online Access: | https://digitalcommons.usf.edu/msc_facpub/1563 https://doi.org/10.1144/M46.47 |
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ftusouthflorida:oai:digitalcommons.usf.edu:msc_facpub-2547 2023-07-30T04:06:50+02:00 Large, Buried Glacial Moraines Revealed by TOPAS Sub-bottom Profiling, South Orkney Islands, South Atlantic Ocean Dickens, W. A. Graham, A. G. C. Smith, J. A. Dowdeswell, J. A. 2016-01-01T08:00:00Z https://digitalcommons.usf.edu/msc_facpub/1563 https://doi.org/10.1144/M46.47 unknown Digital Commons @ University of South Florida https://digitalcommons.usf.edu/msc_facpub/1563 doi:10.1144/M46.47 https://doi.org/10.1144/M46.47 Marine Science Faculty Publications Life Sciences article 2016 ftusouthflorida https://doi.org/10.1144/M46.47 2023-07-13T21:01:51Z 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). Article in Journal/Newspaper South Atlantic Ocean South Orkney Islands University of South Florida St. Petersburg: Digital USFSP 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 |
institution |
Open Polar |
collection |
University of South Florida St. Petersburg: Digital USFSP |
op_collection_id |
ftusouthflorida |
language |
unknown |
topic |
Life Sciences |
spellingShingle |
Life Sciences Dickens, W. A. Graham, A. G. C. Smith, J. A. Dowdeswell, J. A. Large, Buried Glacial Moraines Revealed by TOPAS Sub-bottom Profiling, South Orkney Islands, South Atlantic Ocean |
topic_facet |
Life Sciences |
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). |
format |
Article in Journal/Newspaper |
author |
Dickens, W. A. Graham, A. G. C. Smith, J. A. Dowdeswell, J. A. |
author_facet |
Dickens, W. A. Graham, A. G. C. Smith, J. A. Dowdeswell, J. A. |
author_sort |
Dickens, W. 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 |
Digital Commons @ University of South Florida |
publishDate |
2016 |
url |
https://digitalcommons.usf.edu/msc_facpub/1563 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_source |
Marine Science Faculty Publications |
op_relation |
https://digitalcommons.usf.edu/msc_facpub/1563 doi:10.1144/M46.47 https://doi.org/10.1144/M46.47 |
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_ |
1772819765822226432 |