Mechanisms of subglacial groundwater recharge as derived from noble gas, 14 C, and stable isotopic data
Noble gas, stable isotope and 14 C data from samples collected along groundwater flow path within a confined Paleozoic aquifer in northeastern Wisconsin, USA are used to deduce the effect of the Laurentide Ice Sheet (LIS) on the underlying groundwater and its recharge dynamics. During the last glaci...
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Online Access: | https://doi.org/10.1016/j.epsl.2013.03.012 |
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fteawag:oai:dora:eawag_7278 2024-09-09T19:45:15+00:00 Mechanisms of subglacial groundwater recharge as derived from noble gas, 14 C, and stable isotopic data Grundl, Tim Magnusson, Nathan Brennwald, Matthias S. Kipfer, Rolf 2013 https://doi.org/10.1016/j.epsl.2013.03.012 eng eng Elsevier Earth and Planetary Sciences Letters--Earth Planet. Sci. Lett.--journals:732--0012-821X--1385-013X eawag:7278 journal id: journals:732 issn: 0012-821X e-issn: 1385-013X ut: 000320684500008 local: 16073 scopus: 2-s2.0-84878181374 doi:10.1016/j.epsl.2013.03.012 uri: pmid: noble gas subglacial recharge Pleistocene climate Text Journal Article 2013 fteawag https://doi.org/10.1016/j.epsl.2013.03.012 2024-08-05T03:04:28Z Noble gas, stable isotope and 14 C data from samples collected along groundwater flow path within a confined Paleozoic aquifer in northeastern Wisconsin, USA are used to deduce the effect of the Laurentide Ice Sheet (LIS) on the underlying groundwater and its recharge dynamics. During the last glacial maximum the investigated area was near the center of the Green Bay Lobe of the LIS. 14 C ages that extend to 26 k.a. and low δ 18 O derived temperatures during the time that the LIS was present indicate that aquifer recharge continued when ice covered the area. δ 18 O values as low as −17.5‰ and δ 2 H values as low as −127.7‰ indicate that a significant portion of aquifer recharge was derived from glacial meltwater that maintained its glacial isotopic signature during melting and subsequent recharge. Noble gas temperatures that remain above freezing at a constant ~3 °C, unusually high excess air (ΔNe) values and noble gas fractionation patterns indicate that recharge occurred across a very dynamic water table located within the ice sheet. This englacial hydrologic system experienced recharge heads of as much as 7.8 m. Evidence for direct recharge of basal meltwater into the aquifer is not seen. To the authors' knowledge this is the first time that noble gas and isotope tracers have been used to deduce the provenance of aquifer water beneath continental ice sheets. Article in Journal/Newspaper Ice Sheet DORA Eawag Green Bay ENVELOPE(-36.014,-36.014,-54.870,-54.870) Earth and Planetary Science Letters 369-370 78 85 |
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Open Polar |
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op_collection_id |
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language |
English |
topic |
noble gas subglacial recharge Pleistocene climate |
spellingShingle |
noble gas subglacial recharge Pleistocene climate Grundl, Tim Magnusson, Nathan Brennwald, Matthias S. Kipfer, Rolf Mechanisms of subglacial groundwater recharge as derived from noble gas, 14 C, and stable isotopic data |
topic_facet |
noble gas subglacial recharge Pleistocene climate |
description |
Noble gas, stable isotope and 14 C data from samples collected along groundwater flow path within a confined Paleozoic aquifer in northeastern Wisconsin, USA are used to deduce the effect of the Laurentide Ice Sheet (LIS) on the underlying groundwater and its recharge dynamics. During the last glacial maximum the investigated area was near the center of the Green Bay Lobe of the LIS. 14 C ages that extend to 26 k.a. and low δ 18 O derived temperatures during the time that the LIS was present indicate that aquifer recharge continued when ice covered the area. δ 18 O values as low as −17.5‰ and δ 2 H values as low as −127.7‰ indicate that a significant portion of aquifer recharge was derived from glacial meltwater that maintained its glacial isotopic signature during melting and subsequent recharge. Noble gas temperatures that remain above freezing at a constant ~3 °C, unusually high excess air (ΔNe) values and noble gas fractionation patterns indicate that recharge occurred across a very dynamic water table located within the ice sheet. This englacial hydrologic system experienced recharge heads of as much as 7.8 m. Evidence for direct recharge of basal meltwater into the aquifer is not seen. To the authors' knowledge this is the first time that noble gas and isotope tracers have been used to deduce the provenance of aquifer water beneath continental ice sheets. |
format |
Article in Journal/Newspaper |
author |
Grundl, Tim Magnusson, Nathan Brennwald, Matthias S. Kipfer, Rolf |
author_facet |
Grundl, Tim Magnusson, Nathan Brennwald, Matthias S. Kipfer, Rolf |
author_sort |
Grundl, Tim |
title |
Mechanisms of subglacial groundwater recharge as derived from noble gas, 14 C, and stable isotopic data |
title_short |
Mechanisms of subglacial groundwater recharge as derived from noble gas, 14 C, and stable isotopic data |
title_full |
Mechanisms of subglacial groundwater recharge as derived from noble gas, 14 C, and stable isotopic data |
title_fullStr |
Mechanisms of subglacial groundwater recharge as derived from noble gas, 14 C, and stable isotopic data |
title_full_unstemmed |
Mechanisms of subglacial groundwater recharge as derived from noble gas, 14 C, and stable isotopic data |
title_sort |
mechanisms of subglacial groundwater recharge as derived from noble gas, 14 c, and stable isotopic data |
publisher |
Elsevier |
publishDate |
2013 |
url |
https://doi.org/10.1016/j.epsl.2013.03.012 |
long_lat |
ENVELOPE(-36.014,-36.014,-54.870,-54.870) |
geographic |
Green Bay |
geographic_facet |
Green Bay |
genre |
Ice Sheet |
genre_facet |
Ice Sheet |
op_relation |
Earth and Planetary Sciences Letters--Earth Planet. Sci. Lett.--journals:732--0012-821X--1385-013X eawag:7278 journal id: journals:732 issn: 0012-821X e-issn: 1385-013X ut: 000320684500008 local: 16073 scopus: 2-s2.0-84878181374 doi:10.1016/j.epsl.2013.03.012 uri: pmid: |
op_doi |
https://doi.org/10.1016/j.epsl.2013.03.012 |
container_title |
Earth and Planetary Science Letters |
container_volume |
369-370 |
container_start_page |
78 |
op_container_end_page |
85 |
_version_ |
1809914871602479104 |