Contributions of an ancient evaporitic-type reservoir to subglacial Lake Vostok chemistry
We present here the first comprehensive study of the chemical composition of accretion ice from Lake Vostok. Ion chromatographic analyses were performed on samples obtained along the deeper part of the Vostok ice core. Samples were taken from 3350 down to 3611 m depth, both in glacier ice and subgla...
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ftunivbruxelles:oai:dipot.ulb.ac.be:2013/171106 2023-05-15T13:46:28+02:00 Contributions of an ancient evaporitic-type reservoir to subglacial Lake Vostok chemistry De Angelis, Martine Petit, Jean-Robert Savarino, Joël Souchez, Roland Thiemens, Mark 2004-06 1 full-text file(s): application/pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/171106 https://dipot.ulb.ac.be/dspace/bitstream/2013/171106/1/Elsevier_154736.pdf en eng uri/info:doi/10.1016/j.epsl.2004.03.023 uri/info:pii/S0012821X04002067 uri/info:scp/2942578928 https://dipot.ulb.ac.be/dspace/bitstream/2013/171106/1/Elsevier_154736.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/171106 1 full-text file(s): info:eu-repo/semantics/restrictedAccess Earth and planetary science letters, 222 (3-4 Sciences de l'espace Géographie physique Pétrologie Géochimie Sciences de la terre et du cosmos Accretion ice Antarctica Ice composition Lake Vostok info:eu-repo/semantics/article info:ulb-repo/semantics/articlePeerReview info:ulb-repo/semantics/openurl/article 2004 ftunivbruxelles 2022-06-12T21:04:17Z We present here the first comprehensive study of the chemical composition of accretion ice from Lake Vostok. Ion chromatographic analyses were performed on samples obtained along the deeper part of the Vostok ice core. Samples were taken from 3350 down to 3611 m depth, both in glacier ice and subglacial lake ice. The total ionic contents of two accretion ice layers-a few meters thick and centered around 3540 and 3590 m depth-are several times lower than those of glacier ice. Very low concentrations were also observed in the deeper part of accretion ice, below 3609 m depth. Elsewhere, the total ionic content is variable but remains 5 to 50 times higher than in glacier ice. Whatever its total ionic content, the ionic composition of accretion ice is significantly different from what is observed in glacier ice. It is dominated by sodium chloride, homogeneously distributed throughout the ice lattice, as well as calcium and magnesium sulfate, likely located in solid inclusions, or to a lesser extent at grain boundaries. Chemical considerations combined with additional studies of sulfur and oxygen isotopes in sulfate, and iron measurements strongly suggest that glacier water recycling and bedrock hydrolysis do not play a prominent role in providing impurities to accretion ice. It is more likely that NaCl rich water carrying fine sulfate salt particles is sporadically incorporated in the ice accreting in a shallow bay upstream from Vostok. The origin of such salty water, which should also contribute to Lake salinity, is discussed. © 2004 Elsevier B.V. All rights reserved. SCOPUS: ar.j info:eu-repo/semantics/published Article in Journal/Newspaper Antarc* Antarctica ice core DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) Lake Vostok ENVELOPE(106.000,106.000,-77.500,-77.500) Shallow Bay ENVELOPE(67.467,67.467,-67.817,-67.817) |
institution |
Open Polar |
collection |
DI-fusion : dépôt institutionnel de l'Université libre de Bruxelles (ULB) |
op_collection_id |
ftunivbruxelles |
language |
English |
topic |
Sciences de l'espace Géographie physique Pétrologie Géochimie Sciences de la terre et du cosmos Accretion ice Antarctica Ice composition Lake Vostok |
spellingShingle |
Sciences de l'espace Géographie physique Pétrologie Géochimie Sciences de la terre et du cosmos Accretion ice Antarctica Ice composition Lake Vostok De Angelis, Martine Petit, Jean-Robert Savarino, Joël Souchez, Roland Thiemens, Mark Contributions of an ancient evaporitic-type reservoir to subglacial Lake Vostok chemistry |
topic_facet |
Sciences de l'espace Géographie physique Pétrologie Géochimie Sciences de la terre et du cosmos Accretion ice Antarctica Ice composition Lake Vostok |
description |
We present here the first comprehensive study of the chemical composition of accretion ice from Lake Vostok. Ion chromatographic analyses were performed on samples obtained along the deeper part of the Vostok ice core. Samples were taken from 3350 down to 3611 m depth, both in glacier ice and subglacial lake ice. The total ionic contents of two accretion ice layers-a few meters thick and centered around 3540 and 3590 m depth-are several times lower than those of glacier ice. Very low concentrations were also observed in the deeper part of accretion ice, below 3609 m depth. Elsewhere, the total ionic content is variable but remains 5 to 50 times higher than in glacier ice. Whatever its total ionic content, the ionic composition of accretion ice is significantly different from what is observed in glacier ice. It is dominated by sodium chloride, homogeneously distributed throughout the ice lattice, as well as calcium and magnesium sulfate, likely located in solid inclusions, or to a lesser extent at grain boundaries. Chemical considerations combined with additional studies of sulfur and oxygen isotopes in sulfate, and iron measurements strongly suggest that glacier water recycling and bedrock hydrolysis do not play a prominent role in providing impurities to accretion ice. It is more likely that NaCl rich water carrying fine sulfate salt particles is sporadically incorporated in the ice accreting in a shallow bay upstream from Vostok. The origin of such salty water, which should also contribute to Lake salinity, is discussed. © 2004 Elsevier B.V. All rights reserved. SCOPUS: ar.j info:eu-repo/semantics/published |
format |
Article in Journal/Newspaper |
author |
De Angelis, Martine Petit, Jean-Robert Savarino, Joël Souchez, Roland Thiemens, Mark |
author_facet |
De Angelis, Martine Petit, Jean-Robert Savarino, Joël Souchez, Roland Thiemens, Mark |
author_sort |
De Angelis, Martine |
title |
Contributions of an ancient evaporitic-type reservoir to subglacial Lake Vostok chemistry |
title_short |
Contributions of an ancient evaporitic-type reservoir to subglacial Lake Vostok chemistry |
title_full |
Contributions of an ancient evaporitic-type reservoir to subglacial Lake Vostok chemistry |
title_fullStr |
Contributions of an ancient evaporitic-type reservoir to subglacial Lake Vostok chemistry |
title_full_unstemmed |
Contributions of an ancient evaporitic-type reservoir to subglacial Lake Vostok chemistry |
title_sort |
contributions of an ancient evaporitic-type reservoir to subglacial lake vostok chemistry |
publishDate |
2004 |
url |
http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/171106 https://dipot.ulb.ac.be/dspace/bitstream/2013/171106/1/Elsevier_154736.pdf |
long_lat |
ENVELOPE(106.000,106.000,-77.500,-77.500) ENVELOPE(67.467,67.467,-67.817,-67.817) |
geographic |
Lake Vostok Shallow Bay |
geographic_facet |
Lake Vostok Shallow Bay |
genre |
Antarc* Antarctica ice core |
genre_facet |
Antarc* Antarctica ice core |
op_source |
Earth and planetary science letters, 222 (3-4 |
op_relation |
uri/info:doi/10.1016/j.epsl.2004.03.023 uri/info:pii/S0012821X04002067 uri/info:scp/2942578928 https://dipot.ulb.ac.be/dspace/bitstream/2013/171106/1/Elsevier_154736.pdf http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/171106 |
op_rights |
1 full-text file(s): info:eu-repo/semantics/restrictedAccess |
_version_ |
1766243118522302464 |