Meteoric 10Be as a tracer of subglacial processes and interglacial surface exposure in Greenland
In order to test whether sediment emerging from presently glaciated areas of Greenland was exposed near or at Earth's surface during previous interglacial periods, we measured the rare isotope 10Be contained in grain coatings of sediment collected at five ice marginal sites. Such grain coatings...
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ftiupui:oai:scholarworks.iupui.edu:1805/18973 2023-10-09T21:51:51+02:00 Meteoric 10Be as a tracer of subglacial processes and interglacial surface exposure in Greenland Graly, Joseph A. Corbett, Lee B. Bierman, Paul R. Lini, Andrea Neumann, Thomas A. Earth Sciences, School of Science 2018-07 application/pdf https://hdl.handle.net/1805/18973 en eng Elsevier 10.1016/j.quascirev.2018.05.009 Quaternary Science Reviews Graly, J. A., Corbett, L. B., Bierman, P. R., Lini, A., & Neumann, T. A. (2018). Meteoric 10Be as a tracer of subglacial processes and interglacial surface exposure in Greenland. Quaternary Science Reviews, 191, 118–131. https://doi.org/10.1016/j.quascirev.2018.05.009 https://hdl.handle.net/1805/18973 Publisher Policy Author quaternary interglacials glaciation Article 2018 ftiupui 2023-09-22T14:26:01Z In order to test whether sediment emerging from presently glaciated areas of Greenland was exposed near or at Earth's surface during previous interglacial periods, we measured the rare isotope 10Be contained in grain coatings of sediment collected at five ice marginal sites. Such grain coatings contain meteoric 10Be (10Bemet), which forms in the atmosphere and is deposited onto Earth's surface. Samples include sediment entrained in ice, glaciofluvial sediment collected at the ice margin, and subglacial sediment extracted during hot water drilling in the ablation zone. Due to burial by ice, contemporary subglacial sediment could only have acquired substantial 10Bemet concentrations during periods in the past when the Greenland Ice Sheet was less extensive than present. The highest measured 10Bemet concentrations are comparable to those found in well-developed, long-exposed soils, suggesting subglacial preservation and glacial transport of sediment exposed during preglacial or interglacial periods. Ice-bound sediment has significantly higher 10Bemet concentrations than glaciofluvial sediment, suggesting that glaciofluvial processes are sufficiently erosive to remove tracers of previous interglacial exposures. Northern Greenland sites where ice and sediment are supplied from the ice sheet's central main dome have significantly higher 10Bemet concentrations than sites in southern Greenland, indicating greater preglacial or interglacial landscape preservation in central Greenland than in the south. Because southern Greenland has more frequent and spatially extensive periods of glacial retreat but nevertheless has less evidence of past subaerial exposure, we suggest that 10Bemet measurements in glacial sediment are primarily controlled by erosional efficiency rather than interglacial exposure length. Article in Journal/Newspaper Greenland Ice Sheet Indiana University - Purdue University Indianapolis: IUPUI Scholar Works Greenland |
institution |
Open Polar |
collection |
Indiana University - Purdue University Indianapolis: IUPUI Scholar Works |
op_collection_id |
ftiupui |
language |
English |
topic |
quaternary interglacials glaciation |
spellingShingle |
quaternary interglacials glaciation Graly, Joseph A. Corbett, Lee B. Bierman, Paul R. Lini, Andrea Neumann, Thomas A. Meteoric 10Be as a tracer of subglacial processes and interglacial surface exposure in Greenland |
topic_facet |
quaternary interglacials glaciation |
description |
In order to test whether sediment emerging from presently glaciated areas of Greenland was exposed near or at Earth's surface during previous interglacial periods, we measured the rare isotope 10Be contained in grain coatings of sediment collected at five ice marginal sites. Such grain coatings contain meteoric 10Be (10Bemet), which forms in the atmosphere and is deposited onto Earth's surface. Samples include sediment entrained in ice, glaciofluvial sediment collected at the ice margin, and subglacial sediment extracted during hot water drilling in the ablation zone. Due to burial by ice, contemporary subglacial sediment could only have acquired substantial 10Bemet concentrations during periods in the past when the Greenland Ice Sheet was less extensive than present. The highest measured 10Bemet concentrations are comparable to those found in well-developed, long-exposed soils, suggesting subglacial preservation and glacial transport of sediment exposed during preglacial or interglacial periods. Ice-bound sediment has significantly higher 10Bemet concentrations than glaciofluvial sediment, suggesting that glaciofluvial processes are sufficiently erosive to remove tracers of previous interglacial exposures. Northern Greenland sites where ice and sediment are supplied from the ice sheet's central main dome have significantly higher 10Bemet concentrations than sites in southern Greenland, indicating greater preglacial or interglacial landscape preservation in central Greenland than in the south. Because southern Greenland has more frequent and spatially extensive periods of glacial retreat but nevertheless has less evidence of past subaerial exposure, we suggest that 10Bemet measurements in glacial sediment are primarily controlled by erosional efficiency rather than interglacial exposure length. |
author2 |
Earth Sciences, School of Science |
format |
Article in Journal/Newspaper |
author |
Graly, Joseph A. Corbett, Lee B. Bierman, Paul R. Lini, Andrea Neumann, Thomas A. |
author_facet |
Graly, Joseph A. Corbett, Lee B. Bierman, Paul R. Lini, Andrea Neumann, Thomas A. |
author_sort |
Graly, Joseph A. |
title |
Meteoric 10Be as a tracer of subglacial processes and interglacial surface exposure in Greenland |
title_short |
Meteoric 10Be as a tracer of subglacial processes and interglacial surface exposure in Greenland |
title_full |
Meteoric 10Be as a tracer of subglacial processes and interglacial surface exposure in Greenland |
title_fullStr |
Meteoric 10Be as a tracer of subglacial processes and interglacial surface exposure in Greenland |
title_full_unstemmed |
Meteoric 10Be as a tracer of subglacial processes and interglacial surface exposure in Greenland |
title_sort |
meteoric 10be as a tracer of subglacial processes and interglacial surface exposure in greenland |
publisher |
Elsevier |
publishDate |
2018 |
url |
https://hdl.handle.net/1805/18973 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Ice Sheet |
genre_facet |
Greenland Ice Sheet |
op_source |
Author |
op_relation |
10.1016/j.quascirev.2018.05.009 Quaternary Science Reviews Graly, J. A., Corbett, L. B., Bierman, P. R., Lini, A., & Neumann, T. A. (2018). Meteoric 10Be as a tracer of subglacial processes and interglacial surface exposure in Greenland. Quaternary Science Reviews, 191, 118–131. https://doi.org/10.1016/j.quascirev.2018.05.009 https://hdl.handle.net/1805/18973 |
op_rights |
Publisher Policy |
_version_ |
1779314954507124736 |