Ice sheet erosion patterns in valley systems in northern Sweden investigated using cosmogenic nuclides
Erosion patterns associated with glaciation of trunk and hanging valley systems in northern Sweden were investigated using cosmogenic nuclide Be-10 apparent exposure ages and inferred nuclide inheritance. Sequences of samples taken across valleys known to have been covered repeatedly by the Fermosca...
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ftpurdueuniv:oai:docs.lib.purdue.edu:physics_articles-1703 2023-07-02T03:32:36+02:00 Ice sheet erosion patterns in valley systems in northern Sweden investigated using cosmogenic nuclides Li, Y. K. Harbor, J. Stroeven, A. P. Fabel, D. Kleman, J. Fink, D. Caffee, M. Elmore, D. 2005-01-01T08:00:00Z https://docs.lib.purdue.edu/physics_articles/188 http://onlinelibrary.wiley.com/doi/10.1002/esp.1261/abstract unknown Purdue University https://docs.lib.purdue.edu/physics_articles/188 http://onlinelibrary.wiley.com/doi/10.1002/esp.1261/abstract Department of Physics and Astronomy Faculty Publications cosmogenic nuclides; glacial valley; erosion patterns; surface exposure dating; fermoscandian ice sheet; northern sweden; cross-profile development; rock mass strength; glacial-valley; rational explanation; section morphology; southern alps; new-zealand; aniya 1988; surfaces; rates text 2005 ftpurdueuniv 2023-06-12T20:19:41Z Erosion patterns associated with glaciation of trunk and hanging valley systems in northern Sweden were investigated using cosmogenic nuclide Be-10 apparent exposure ages and inferred nuclide inheritance. Sequences of samples taken across valleys known to have been covered repeatedly by the Fermoscandian ice sheet revealed two primary patterns of erosion. In Vavlavagge the exposure age pattern is consistent with > 2 m of glacial erosion during the last glacial cycle along the entire profile. At Ravtasvaggi, Dievssavaggi and Alisvaggi, exposure ages in the valley bottom contrast with apparent exposure ages two to four times older on the valley sides. The older ages on the valley sides reflect cosmogenic nuclide inheritance due to limited (< 2 m) bedrock erosion of the valley sides during the last glacial cycle. The pattern and scale of erosion in these valleys indicates that glacial valley formation is a result of multiple glacial cycles rather than the result of topographic modification during a single glacial cycle. Initial data comparing hanging valley and trunk valley sites do not show distinct differences in apparent exposure ages. Slightly older ages for samples from hanging valley bottoms may suggest nuclide inheritance indicating lower erosion than in trunk valley bottoms, as would be expected given the marked topographic step between hanging and trunk valleys. Although quantifying the amount of erosion depends on the assumed cosmogenic nuclide inheritance prior to the onset of erosion, the pattern of erosion is independent of this. Hence the observed pattern of cosmogenic nuclide concentrations provides constraints on spatial patterns of erosion and helps to refine understanding of the timing and extent of landform modification by glaciation. Copyright (c) 2005 John Wiley & Sons, Ltd. Text Ice Sheet Northern Sweden Purdue University: e-Pubs New Zealand |
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Open Polar |
collection |
Purdue University: e-Pubs |
op_collection_id |
ftpurdueuniv |
language |
unknown |
topic |
cosmogenic nuclides; glacial valley; erosion patterns; surface exposure dating; fermoscandian ice sheet; northern sweden; cross-profile development; rock mass strength; glacial-valley; rational explanation; section morphology; southern alps; new-zealand; aniya 1988; surfaces; rates |
spellingShingle |
cosmogenic nuclides; glacial valley; erosion patterns; surface exposure dating; fermoscandian ice sheet; northern sweden; cross-profile development; rock mass strength; glacial-valley; rational explanation; section morphology; southern alps; new-zealand; aniya 1988; surfaces; rates Li, Y. K. Harbor, J. Stroeven, A. P. Fabel, D. Kleman, J. Fink, D. Caffee, M. Elmore, D. Ice sheet erosion patterns in valley systems in northern Sweden investigated using cosmogenic nuclides |
topic_facet |
cosmogenic nuclides; glacial valley; erosion patterns; surface exposure dating; fermoscandian ice sheet; northern sweden; cross-profile development; rock mass strength; glacial-valley; rational explanation; section morphology; southern alps; new-zealand; aniya 1988; surfaces; rates |
description |
Erosion patterns associated with glaciation of trunk and hanging valley systems in northern Sweden were investigated using cosmogenic nuclide Be-10 apparent exposure ages and inferred nuclide inheritance. Sequences of samples taken across valleys known to have been covered repeatedly by the Fermoscandian ice sheet revealed two primary patterns of erosion. In Vavlavagge the exposure age pattern is consistent with > 2 m of glacial erosion during the last glacial cycle along the entire profile. At Ravtasvaggi, Dievssavaggi and Alisvaggi, exposure ages in the valley bottom contrast with apparent exposure ages two to four times older on the valley sides. The older ages on the valley sides reflect cosmogenic nuclide inheritance due to limited (< 2 m) bedrock erosion of the valley sides during the last glacial cycle. The pattern and scale of erosion in these valleys indicates that glacial valley formation is a result of multiple glacial cycles rather than the result of topographic modification during a single glacial cycle. Initial data comparing hanging valley and trunk valley sites do not show distinct differences in apparent exposure ages. Slightly older ages for samples from hanging valley bottoms may suggest nuclide inheritance indicating lower erosion than in trunk valley bottoms, as would be expected given the marked topographic step between hanging and trunk valleys. Although quantifying the amount of erosion depends on the assumed cosmogenic nuclide inheritance prior to the onset of erosion, the pattern of erosion is independent of this. Hence the observed pattern of cosmogenic nuclide concentrations provides constraints on spatial patterns of erosion and helps to refine understanding of the timing and extent of landform modification by glaciation. Copyright (c) 2005 John Wiley & Sons, Ltd. |
format |
Text |
author |
Li, Y. K. Harbor, J. Stroeven, A. P. Fabel, D. Kleman, J. Fink, D. Caffee, M. Elmore, D. |
author_facet |
Li, Y. K. Harbor, J. Stroeven, A. P. Fabel, D. Kleman, J. Fink, D. Caffee, M. Elmore, D. |
author_sort |
Li, Y. K. |
title |
Ice sheet erosion patterns in valley systems in northern Sweden investigated using cosmogenic nuclides |
title_short |
Ice sheet erosion patterns in valley systems in northern Sweden investigated using cosmogenic nuclides |
title_full |
Ice sheet erosion patterns in valley systems in northern Sweden investigated using cosmogenic nuclides |
title_fullStr |
Ice sheet erosion patterns in valley systems in northern Sweden investigated using cosmogenic nuclides |
title_full_unstemmed |
Ice sheet erosion patterns in valley systems in northern Sweden investigated using cosmogenic nuclides |
title_sort |
ice sheet erosion patterns in valley systems in northern sweden investigated using cosmogenic nuclides |
publisher |
Purdue University |
publishDate |
2005 |
url |
https://docs.lib.purdue.edu/physics_articles/188 http://onlinelibrary.wiley.com/doi/10.1002/esp.1261/abstract |
geographic |
New Zealand |
geographic_facet |
New Zealand |
genre |
Ice Sheet Northern Sweden |
genre_facet |
Ice Sheet Northern Sweden |
op_source |
Department of Physics and Astronomy Faculty Publications |
op_relation |
https://docs.lib.purdue.edu/physics_articles/188 http://onlinelibrary.wiley.com/doi/10.1002/esp.1261/abstract |
_version_ |
1770272214115942400 |