Solute sources and geochemical processes in Subglacial Lake Whillans, West Antarctica
Subglacial Lake Whillans (SLW), West Antarctica, is an active component of the subglacial hydrological network located beneath 800 m of ice. The fill and drain behavior of SLW leads to long (years to decades) water residence times relative to those in mountain glacier systems. Here, we present the a...
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Online Access: | http://hdl.handle.net/10278/3717200 https://doi.org/10.1130/G37639.1 http://geology.gsapubs.org/content/44/5/347.full.pdf |
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ftuniveneziairis:oai:iris.unive.it:10278/3717200 2024-04-14T08:04:17+00:00 Solute sources and geochemical processes in Subglacial Lake Whillans, West Antarctica Michaud A. B. Skidmore M. L. Mitchell A. C. Vick-Majors T. J. Barbante C. Turetta C. Van Gelder W. Priscu J. C. Michaud, A. B. Skidmore, M. L. Mitchell, A. C. Vick-Majors, T. J. Barbante, C. Turetta, C. Van Gelder, W. Priscu, J. C. 2016 ELETTRONICO http://hdl.handle.net/10278/3717200 https://doi.org/10.1130/G37639.1 http://geology.gsapubs.org/content/44/5/347.full.pdf eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000374877500005 volume:44 issue:5 firstpage:347 lastpage:350 numberofpages:4 journal:GEOLOGY http://hdl.handle.net/10278/3717200 doi:10.1130/G37639.1 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84966320650 http://geology.gsapubs.org/content/44/5/347.full.pdf info:eu-repo/semantics/closedAccess Settore CHIM/01 - Chimica Analitica info:eu-repo/semantics/article 2016 ftuniveneziairis https://doi.org/10.1130/G37639.1 2024-03-21T18:10:17Z Subglacial Lake Whillans (SLW), West Antarctica, is an active component of the subglacial hydrological network located beneath 800 m of ice. The fill and drain behavior of SLW leads to long (years to decades) water residence times relative to those in mountain glacier systems. Here, we present the aqueous geochemistry of the SLW water column and pore waters from a 38-cm-long sediment core. Stable isotopes indicate that the water is primarily sourced from basal-ice melt with a minor contribution from seawater that reaches a maximum of similar to 6% in pore water at the bottom of the sediment core. Silicate weathering products dominate the crustal (non-seawater) component of lake-and pore-water solutes, and there is evidence for cation exchange processes within the clay-rich lake sediments. The crustal solute component ranges from 6 meq L-1 in lake waters to 17 meq L-1 in the deepest pore waters. The pore-water profiles of the major dissolved ions indicate a more concentrated solute source at depth (> 38 cm). The combination of significant seawater and crustal components to SLW lake and sediment pore waters in concert with ion exchange processes result in a weathering regime that contrasts with other subglacial systems. The results also indicate cycling of marine water sourced from the sediments back to the ocean during lake drainage events. Article in Journal/Newspaper Antarc* Antarctica West Antarctica Università Ca’ Foscari Venezia: ARCA (Archivio Istituzionale della Ricerca) West Antarctica Whillans ENVELOPE(-64.250,-64.250,-84.450,-84.450) Geology 44 5 347 350 |
institution |
Open Polar |
collection |
Università Ca’ Foscari Venezia: ARCA (Archivio Istituzionale della Ricerca) |
op_collection_id |
ftuniveneziairis |
language |
English |
topic |
Settore CHIM/01 - Chimica Analitica |
spellingShingle |
Settore CHIM/01 - Chimica Analitica Michaud A. B. Skidmore M. L. Mitchell A. C. Vick-Majors T. J. Barbante C. Turetta C. Van Gelder W. Priscu J. C. Solute sources and geochemical processes in Subglacial Lake Whillans, West Antarctica |
topic_facet |
Settore CHIM/01 - Chimica Analitica |
description |
Subglacial Lake Whillans (SLW), West Antarctica, is an active component of the subglacial hydrological network located beneath 800 m of ice. The fill and drain behavior of SLW leads to long (years to decades) water residence times relative to those in mountain glacier systems. Here, we present the aqueous geochemistry of the SLW water column and pore waters from a 38-cm-long sediment core. Stable isotopes indicate that the water is primarily sourced from basal-ice melt with a minor contribution from seawater that reaches a maximum of similar to 6% in pore water at the bottom of the sediment core. Silicate weathering products dominate the crustal (non-seawater) component of lake-and pore-water solutes, and there is evidence for cation exchange processes within the clay-rich lake sediments. The crustal solute component ranges from 6 meq L-1 in lake waters to 17 meq L-1 in the deepest pore waters. The pore-water profiles of the major dissolved ions indicate a more concentrated solute source at depth (> 38 cm). The combination of significant seawater and crustal components to SLW lake and sediment pore waters in concert with ion exchange processes result in a weathering regime that contrasts with other subglacial systems. The results also indicate cycling of marine water sourced from the sediments back to the ocean during lake drainage events. |
author2 |
Michaud, A. B. Skidmore, M. L. Mitchell, A. C. Vick-Majors, T. J. Barbante, C. Turetta, C. Van Gelder, W. Priscu, J. C. |
format |
Article in Journal/Newspaper |
author |
Michaud A. B. Skidmore M. L. Mitchell A. C. Vick-Majors T. J. Barbante C. Turetta C. Van Gelder W. Priscu J. C. |
author_facet |
Michaud A. B. Skidmore M. L. Mitchell A. C. Vick-Majors T. J. Barbante C. Turetta C. Van Gelder W. Priscu J. C. |
author_sort |
Michaud A. B. |
title |
Solute sources and geochemical processes in Subglacial Lake Whillans, West Antarctica |
title_short |
Solute sources and geochemical processes in Subglacial Lake Whillans, West Antarctica |
title_full |
Solute sources and geochemical processes in Subglacial Lake Whillans, West Antarctica |
title_fullStr |
Solute sources and geochemical processes in Subglacial Lake Whillans, West Antarctica |
title_full_unstemmed |
Solute sources and geochemical processes in Subglacial Lake Whillans, West Antarctica |
title_sort |
solute sources and geochemical processes in subglacial lake whillans, west antarctica |
publishDate |
2016 |
url |
http://hdl.handle.net/10278/3717200 https://doi.org/10.1130/G37639.1 http://geology.gsapubs.org/content/44/5/347.full.pdf |
long_lat |
ENVELOPE(-64.250,-64.250,-84.450,-84.450) |
geographic |
West Antarctica Whillans |
geographic_facet |
West Antarctica Whillans |
genre |
Antarc* Antarctica West Antarctica |
genre_facet |
Antarc* Antarctica West Antarctica |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000374877500005 volume:44 issue:5 firstpage:347 lastpage:350 numberofpages:4 journal:GEOLOGY http://hdl.handle.net/10278/3717200 doi:10.1130/G37639.1 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-84966320650 http://geology.gsapubs.org/content/44/5/347.full.pdf |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1130/G37639.1 |
container_title |
Geology |
container_volume |
44 |
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5 |
container_start_page |
347 |
op_container_end_page |
350 |
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