Isotopic signature of debris-rich ice formed by regelation into a subglacial sediment bed
Among the processes that may entrain sediment in the bases of glaciers and ice sheets, basal ice may regelate downward into the pores of unlithified sediment. Laboratory studies suggest that this process leaves interstitial ice with a distribution of δ18O and δD that is distinct from that developed...
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ftunivbruxelles:oai:dipot.ulb.ac.be:2013/169799 2023-05-15T16:29:02+02:00 Isotopic signature of debris-rich ice formed by regelation into a subglacial sediment bed Iverson, Neal Souchez, Roland 1996-05 No full-text files http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/169799 en eng uri/info:doi/10.1029/96GL01073 uri/info:scp/0030135174 http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/169799 Geophysical research letters, 23 (10 Sciences de la terre et du cosmos Géographie physique info:eu-repo/semantics/article info:ulb-repo/semantics/articlePeerReview info:ulb-repo/semantics/openurl/article 1996 ftunivbruxelles 2022-06-12T20:36:10Z Among the processes that may entrain sediment in the bases of glaciers and ice sheets, basal ice may regelate downward into the pores of unlithified sediment. Laboratory studies suggest that this process leaves interstitial ice with a distribution of δ18O and δD that is distinct from that developed due to downward freezing of a semi-closed water reservoir. Although as a result of both processes these isotopes lie on a freezing slope in a δD-δ18O diagram, debris layers entrained by regelation past grains are both enriched in heavy isotopes with depth and display a downward decrease in deuterium excess, the converse of that due to downward freezing of a water reservoir. Moreover, the extent of enrichment can be significantly larger in the case of regelation into the bed. Reevaluated field data from West Greenland are consistent with regelation into the bed as an entrainment mechanism. Copyright 1996 by the American Geophysical Union. SCOPUS: ar.j FLWNA info:eu-repo/semantics/published Article in Journal/Newspaper Greenland DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) Greenland |
institution |
Open Polar |
collection |
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Sciences de la terre et du cosmos Géographie physique |
spellingShingle |
Sciences de la terre et du cosmos Géographie physique Iverson, Neal Souchez, Roland Isotopic signature of debris-rich ice formed by regelation into a subglacial sediment bed |
topic_facet |
Sciences de la terre et du cosmos Géographie physique |
description |
Among the processes that may entrain sediment in the bases of glaciers and ice sheets, basal ice may regelate downward into the pores of unlithified sediment. Laboratory studies suggest that this process leaves interstitial ice with a distribution of δ18O and δD that is distinct from that developed due to downward freezing of a semi-closed water reservoir. Although as a result of both processes these isotopes lie on a freezing slope in a δD-δ18O diagram, debris layers entrained by regelation past grains are both enriched in heavy isotopes with depth and display a downward decrease in deuterium excess, the converse of that due to downward freezing of a water reservoir. Moreover, the extent of enrichment can be significantly larger in the case of regelation into the bed. Reevaluated field data from West Greenland are consistent with regelation into the bed as an entrainment mechanism. Copyright 1996 by the American Geophysical Union. SCOPUS: ar.j FLWNA info:eu-repo/semantics/published |
format |
Article in Journal/Newspaper |
author |
Iverson, Neal Souchez, Roland |
author_facet |
Iverson, Neal Souchez, Roland |
author_sort |
Iverson, Neal |
title |
Isotopic signature of debris-rich ice formed by regelation into a subglacial sediment bed |
title_short |
Isotopic signature of debris-rich ice formed by regelation into a subglacial sediment bed |
title_full |
Isotopic signature of debris-rich ice formed by regelation into a subglacial sediment bed |
title_fullStr |
Isotopic signature of debris-rich ice formed by regelation into a subglacial sediment bed |
title_full_unstemmed |
Isotopic signature of debris-rich ice formed by regelation into a subglacial sediment bed |
title_sort |
isotopic signature of debris-rich ice formed by regelation into a subglacial sediment bed |
publishDate |
1996 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/169799 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Geophysical research letters, 23 (10 |
op_relation |
uri/info:doi/10.1029/96GL01073 uri/info:scp/0030135174 http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/169799 |
_version_ |
1766018728805269504 |