Inferences of Subglacial Processes Under the West Antarctic Ice Sheet From Grain Surface Textures
Subglacial sediment transport under Whillans Ice Stream in West Antarctica is inferred using samples collected from Subglacial Lake Whillans (SLW) and two sites at a location called “UpB”. The surface features on quartz grains between 125 and 1000 micrometers were described using a Scanning Electron...
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ftimsa:oai:digitalcommons.imsa.edu:sir_presentations-1032 2023-05-15T13:32:08+02:00 Inferences of Subglacial Processes Under the West Antarctic Ice Sheet From Grain Surface Textures Wheeler, Aspen, '16 2016-04-28T20:35:00Z application/pdf https://digitalcommons.imsa.edu/sir_presentations/2016/oralsession3/3 https://digitalcommons.imsa.edu/cgi/viewcontent.cgi?article=1032&context=sir_presentations unknown DigitalCommons@IMSA https://digitalcommons.imsa.edu/sir_presentations/2016/oralsession3/3 https://digitalcommons.imsa.edu/cgi/viewcontent.cgi?article=1032&context=sir_presentations IMSAloquium Student Investigation Showcase Earth Sciences text 2016 ftimsa 2022-08-08T12:52:56Z Subglacial sediment transport under Whillans Ice Stream in West Antarctica is inferred using samples collected from Subglacial Lake Whillans (SLW) and two sites at a location called “UpB”. The surface features on quartz grains between 125 and 1000 micrometers were described using a Scanning Electron Microscope. Mahaney’s Atlas of Sand Grain Surface Textures and Applications (2002) was used to uniformly and unbiasedly categorize surface features from SLW and UpB, for different grain sizes and depths in cores collected from subglacial till. Data showed three groups that can be used to delineate phases of the subglacial sediment. Phase one is shown by features indicating surface weathering formed while grains were in their original rock outcrop. Phase two is features overprinted on phase one, which indicate glacial transport within subglacial till due to the high frequency of glacial transport features. The final phase is younger weathering features that overprint the glacial transport features such as etching and precipitation features attributed to microbiologically-mediated chemical changes. This supports the view that subglacial transport occurs in till rather than in the waters that fill and drain SLW. Furthermore, microbial activity detected in SLW sediment and waters is likely to be pervasive up-stream from the lake. Text Antarc* Antarctic Antarctica Ice Sheet West Antarctica Whillans Ice Stream Illinois Mathematics and Science Academy: DigitalCommons@IMSA Antarctic West Antarctic Ice Sheet West Antarctica Whillans ENVELOPE(-64.250,-64.250,-84.450,-84.450) Whillans Ice Stream ENVELOPE(-145.000,-145.000,-83.667,-83.667) |
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Illinois Mathematics and Science Academy: DigitalCommons@IMSA |
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Earth Sciences |
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Earth Sciences Wheeler, Aspen, '16 Inferences of Subglacial Processes Under the West Antarctic Ice Sheet From Grain Surface Textures |
topic_facet |
Earth Sciences |
description |
Subglacial sediment transport under Whillans Ice Stream in West Antarctica is inferred using samples collected from Subglacial Lake Whillans (SLW) and two sites at a location called “UpB”. The surface features on quartz grains between 125 and 1000 micrometers were described using a Scanning Electron Microscope. Mahaney’s Atlas of Sand Grain Surface Textures and Applications (2002) was used to uniformly and unbiasedly categorize surface features from SLW and UpB, for different grain sizes and depths in cores collected from subglacial till. Data showed three groups that can be used to delineate phases of the subglacial sediment. Phase one is shown by features indicating surface weathering formed while grains were in their original rock outcrop. Phase two is features overprinted on phase one, which indicate glacial transport within subglacial till due to the high frequency of glacial transport features. The final phase is younger weathering features that overprint the glacial transport features such as etching and precipitation features attributed to microbiologically-mediated chemical changes. This supports the view that subglacial transport occurs in till rather than in the waters that fill and drain SLW. Furthermore, microbial activity detected in SLW sediment and waters is likely to be pervasive up-stream from the lake. |
format |
Text |
author |
Wheeler, Aspen, '16 |
author_facet |
Wheeler, Aspen, '16 |
author_sort |
Wheeler, Aspen, '16 |
title |
Inferences of Subglacial Processes Under the West Antarctic Ice Sheet From Grain Surface Textures |
title_short |
Inferences of Subglacial Processes Under the West Antarctic Ice Sheet From Grain Surface Textures |
title_full |
Inferences of Subglacial Processes Under the West Antarctic Ice Sheet From Grain Surface Textures |
title_fullStr |
Inferences of Subglacial Processes Under the West Antarctic Ice Sheet From Grain Surface Textures |
title_full_unstemmed |
Inferences of Subglacial Processes Under the West Antarctic Ice Sheet From Grain Surface Textures |
title_sort |
inferences of subglacial processes under the west antarctic ice sheet from grain surface textures |
publisher |
DigitalCommons@IMSA |
publishDate |
2016 |
url |
https://digitalcommons.imsa.edu/sir_presentations/2016/oralsession3/3 https://digitalcommons.imsa.edu/cgi/viewcontent.cgi?article=1032&context=sir_presentations |
long_lat |
ENVELOPE(-64.250,-64.250,-84.450,-84.450) ENVELOPE(-145.000,-145.000,-83.667,-83.667) |
geographic |
Antarctic West Antarctic Ice Sheet West Antarctica Whillans Whillans Ice Stream |
geographic_facet |
Antarctic West Antarctic Ice Sheet West Antarctica Whillans Whillans Ice Stream |
genre |
Antarc* Antarctic Antarctica Ice Sheet West Antarctica Whillans Ice Stream |
genre_facet |
Antarc* Antarctic Antarctica Ice Sheet West Antarctica Whillans Ice Stream |
op_source |
IMSAloquium Student Investigation Showcase |
op_relation |
https://digitalcommons.imsa.edu/sir_presentations/2016/oralsession3/3 https://digitalcommons.imsa.edu/cgi/viewcontent.cgi?article=1032&context=sir_presentations |
_version_ |
1766024487416889344 |