Continental-scale transport of sediments by the Baltic Ice Stream elucidated by coupled grain size and Nd provenance analyses
We introduce a methodology for determining the transport distance of subglacially comminuted and entrained sediments. We pilot this method on sediments from the terminal margin of the Baltic Ice Stream, the largest ice stream of the Fennoscandian Ice Sheet during the Last Glacial Maximum. A strong c...
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ftcolumbiauniv:oai:academiccommons.columbia.edu:10.7916/D8418DJS 2023-05-15T16:13:00+02:00 Continental-scale transport of sediments by the Baltic Ice Stream elucidated by coupled grain size and Nd provenance analyses Boswell, Steven M. Toucanne, Samuel Creyts, Timothy T. Hemming, Sidney R. 2018 https://doi.org/10.7916/D8418DJS English eng https://doi.org/10.7916/D8418DJS Ice streams Ice sheets Ice sheets--Measurement Sediment transport Drift Earth sciences Articles 2018 ftcolumbiauniv https://doi.org/10.7916/D8418DJS 2019-04-04T08:17:27Z We introduce a methodology for determining the transport distance of subglacially comminuted and entrained sediments. We pilot this method on sediments from the terminal margin of the Baltic Ice Stream, the largest ice stream of the Fennoscandian Ice Sheet during the Last Glacial Maximum. A strong correlation (R2 = 0.83) between the εNd and latitudes of circum-Baltic river sediments enables us to use εNd as a calibrated measure of distance. The proportion of subglacially transported sediments in a sample is estimated from grain size ratios in the silt fraction (<63 μm). Coupled εNd and grain size analyses reveal a common erosion source for the Baltic Ice Stream sediments located near the Åland sill, more than 850 km upstream from the terminal moraines. This result is in agreement with both numerical modeling and geomorphological investigations of Fennoscandinavian erosion, and is consistent with rapid ice flow into the Baltic basins prior to the Last Glacial Maximum. The methodology introduced here could be used to infer the distances of glacigenic sediment transport from Late Pleistocene and earlier glaciations. Article in Journal/Newspaper Fennoscandian Ice Sheet Columbia University: Academic Commons |
institution |
Open Polar |
collection |
Columbia University: Academic Commons |
op_collection_id |
ftcolumbiauniv |
language |
English |
topic |
Ice streams Ice sheets Ice sheets--Measurement Sediment transport Drift Earth sciences |
spellingShingle |
Ice streams Ice sheets Ice sheets--Measurement Sediment transport Drift Earth sciences Boswell, Steven M. Toucanne, Samuel Creyts, Timothy T. Hemming, Sidney R. Continental-scale transport of sediments by the Baltic Ice Stream elucidated by coupled grain size and Nd provenance analyses |
topic_facet |
Ice streams Ice sheets Ice sheets--Measurement Sediment transport Drift Earth sciences |
description |
We introduce a methodology for determining the transport distance of subglacially comminuted and entrained sediments. We pilot this method on sediments from the terminal margin of the Baltic Ice Stream, the largest ice stream of the Fennoscandian Ice Sheet during the Last Glacial Maximum. A strong correlation (R2 = 0.83) between the εNd and latitudes of circum-Baltic river sediments enables us to use εNd as a calibrated measure of distance. The proportion of subglacially transported sediments in a sample is estimated from grain size ratios in the silt fraction (<63 μm). Coupled εNd and grain size analyses reveal a common erosion source for the Baltic Ice Stream sediments located near the Åland sill, more than 850 km upstream from the terminal moraines. This result is in agreement with both numerical modeling and geomorphological investigations of Fennoscandinavian erosion, and is consistent with rapid ice flow into the Baltic basins prior to the Last Glacial Maximum. The methodology introduced here could be used to infer the distances of glacigenic sediment transport from Late Pleistocene and earlier glaciations. |
format |
Article in Journal/Newspaper |
author |
Boswell, Steven M. Toucanne, Samuel Creyts, Timothy T. Hemming, Sidney R. |
author_facet |
Boswell, Steven M. Toucanne, Samuel Creyts, Timothy T. Hemming, Sidney R. |
author_sort |
Boswell, Steven M. |
title |
Continental-scale transport of sediments by the Baltic Ice Stream elucidated by coupled grain size and Nd provenance analyses |
title_short |
Continental-scale transport of sediments by the Baltic Ice Stream elucidated by coupled grain size and Nd provenance analyses |
title_full |
Continental-scale transport of sediments by the Baltic Ice Stream elucidated by coupled grain size and Nd provenance analyses |
title_fullStr |
Continental-scale transport of sediments by the Baltic Ice Stream elucidated by coupled grain size and Nd provenance analyses |
title_full_unstemmed |
Continental-scale transport of sediments by the Baltic Ice Stream elucidated by coupled grain size and Nd provenance analyses |
title_sort |
continental-scale transport of sediments by the baltic ice stream elucidated by coupled grain size and nd provenance analyses |
publishDate |
2018 |
url |
https://doi.org/10.7916/D8418DJS |
genre |
Fennoscandian Ice Sheet |
genre_facet |
Fennoscandian Ice Sheet |
op_relation |
https://doi.org/10.7916/D8418DJS |
op_doi |
https://doi.org/10.7916/D8418DJS |
_version_ |
1765998606275313664 |