Lithium Isotope Geochemistry in the Barton Peninsula, King George Island, Antarctica
International audience Lithium (Li) has two stable isotopes, 6 Li and 7 Li, whose large relative mass difference is responsible for significant isotopic fractionation during physico-chemical processes, allowing Li isotopes to be a good tracer of continental chemical weathering. Although physical ero...
Published in: | Frontiers in Earth Science |
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ftunivnantes:oai:HAL:hal-03864326v1 2023-05-15T13:58:36+02:00 Lithium Isotope Geochemistry in the Barton Peninsula, King George Island, Antarctica Ryu, Jong-Sik Lim, Hyoun, Choi, Hye-Bin Kim, Ji-Hoon Kim, Ok-Sun Vigier, Nathalie Laboratoire d'océanographie de Villefranche (LOV) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de la Mer de Villefranche (IMEV) Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Centre National de la Recherche Scientifique (CNRS) Sorbonne Université (SU) 2022-07-22 https://hal.archives-ouvertes.fr/hal-03864326 https://hal.archives-ouvertes.fr/hal-03864326/document https://hal.archives-ouvertes.fr/hal-03864326/file/Ryu2022Frontiers.pdf https://doi.org/10.3389/feart.2022.913687 en eng HAL CCSD Frontiers Media info:eu-repo/semantics/altIdentifier/doi/10.3389/feart.2022.913687 hal-03864326 https://hal.archives-ouvertes.fr/hal-03864326 https://hal.archives-ouvertes.fr/hal-03864326/document https://hal.archives-ouvertes.fr/hal-03864326/file/Ryu2022Frontiers.pdf doi:10.3389/feart.2022.913687 info:eu-repo/semantics/OpenAccess ISSN: 2296-6463 Frontiers in Earth Science https://hal.archives-ouvertes.fr/hal-03864326 Frontiers in Earth Science, 2022, 10, ⟨10.3389/feart.2022.913687⟩ Li isotopes chemical weathering meltwater mineral neoformation Antarctica [SDU]Sciences of the Universe [physics] info:eu-repo/semantics/article Journal articles 2022 ftunivnantes https://doi.org/10.3389/feart.2022.913687 2022-12-07T00:23:28Z International audience Lithium (Li) has two stable isotopes, 6 Li and 7 Li, whose large relative mass difference is responsible for significant isotopic fractionation during physico-chemical processes, allowing Li isotopes to be a good tracer of continental chemical weathering. Although physical erosion is dominant in the Polar regions due to glaciers, increasing global surface temperature may enhance chemical weathering, with possible consequences on carbon biogeochemical cycle and nutriment flux to the ocean. Here, we examined elemental and Li isotope geochemistry of meltwaters, suspended sediments, soils, and bedrocks in the Barton Peninsula, King George Island, Antarctica. Li concentrations range from 8.7 nM to 23.3 μM in waters, from 0.01 to 1.43 ppm in suspended sediments, from 9.56 to 36.9 ppm in soils, and from 0.42 to 28.3 ppm in bedrocks. δ 7 Li values are also variable, ranging from +16.4 to +41.1‰ in waters, from −0.4 to +13.4‰ in suspended sediments, from −2.5 to +6.9‰ in soils, and from −1.8 to +11.7‰ in bedrocks. Elemental and Li isotope geochemistry reveals that secondary phase formation during chemical weathering mainly control dissolved δ 7 Li values, rather than a mixing with sea salt inputs from atmosphere or ice melting. Likewise, δ 7 Li values of suspended sediments and soils lower than those of bedrocks indicate modern chemical weathering with mineral neoformation. This study suggests that increasing global surface temperature enhances modern chemical weathering in Antarctica, continuing to lower δ 7 Li values in meltwater with intense water-rock interactions. Article in Journal/Newspaper Antarc* Antarctica King George Island Université de Nantes: HAL-UNIV-NANTES Barton ENVELOPE(-58.733,-58.733,-62.233,-62.233) Barton Peninsula ENVELOPE(-58.741,-58.741,-62.227,-62.227) King George Island Frontiers in Earth Science 10 |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
Li isotopes chemical weathering meltwater mineral neoformation Antarctica [SDU]Sciences of the Universe [physics] |
spellingShingle |
Li isotopes chemical weathering meltwater mineral neoformation Antarctica [SDU]Sciences of the Universe [physics] Ryu, Jong-Sik Lim, Hyoun, Choi, Hye-Bin Kim, Ji-Hoon Kim, Ok-Sun Vigier, Nathalie Lithium Isotope Geochemistry in the Barton Peninsula, King George Island, Antarctica |
topic_facet |
Li isotopes chemical weathering meltwater mineral neoformation Antarctica [SDU]Sciences of the Universe [physics] |
description |
International audience Lithium (Li) has two stable isotopes, 6 Li and 7 Li, whose large relative mass difference is responsible for significant isotopic fractionation during physico-chemical processes, allowing Li isotopes to be a good tracer of continental chemical weathering. Although physical erosion is dominant in the Polar regions due to glaciers, increasing global surface temperature may enhance chemical weathering, with possible consequences on carbon biogeochemical cycle and nutriment flux to the ocean. Here, we examined elemental and Li isotope geochemistry of meltwaters, suspended sediments, soils, and bedrocks in the Barton Peninsula, King George Island, Antarctica. Li concentrations range from 8.7 nM to 23.3 μM in waters, from 0.01 to 1.43 ppm in suspended sediments, from 9.56 to 36.9 ppm in soils, and from 0.42 to 28.3 ppm in bedrocks. δ 7 Li values are also variable, ranging from +16.4 to +41.1‰ in waters, from −0.4 to +13.4‰ in suspended sediments, from −2.5 to +6.9‰ in soils, and from −1.8 to +11.7‰ in bedrocks. Elemental and Li isotope geochemistry reveals that secondary phase formation during chemical weathering mainly control dissolved δ 7 Li values, rather than a mixing with sea salt inputs from atmosphere or ice melting. Likewise, δ 7 Li values of suspended sediments and soils lower than those of bedrocks indicate modern chemical weathering with mineral neoformation. This study suggests that increasing global surface temperature enhances modern chemical weathering in Antarctica, continuing to lower δ 7 Li values in meltwater with intense water-rock interactions. |
author2 |
Laboratoire d'océanographie de Villefranche (LOV) Institut national des sciences de l'Univers (INSU - CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Institut de la Mer de Villefranche (IMEV) Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS) Centre National de la Recherche Scientifique (CNRS) Sorbonne Université (SU) |
format |
Article in Journal/Newspaper |
author |
Ryu, Jong-Sik Lim, Hyoun, Choi, Hye-Bin Kim, Ji-Hoon Kim, Ok-Sun Vigier, Nathalie |
author_facet |
Ryu, Jong-Sik Lim, Hyoun, Choi, Hye-Bin Kim, Ji-Hoon Kim, Ok-Sun Vigier, Nathalie |
author_sort |
Ryu, Jong-Sik |
title |
Lithium Isotope Geochemistry in the Barton Peninsula, King George Island, Antarctica |
title_short |
Lithium Isotope Geochemistry in the Barton Peninsula, King George Island, Antarctica |
title_full |
Lithium Isotope Geochemistry in the Barton Peninsula, King George Island, Antarctica |
title_fullStr |
Lithium Isotope Geochemistry in the Barton Peninsula, King George Island, Antarctica |
title_full_unstemmed |
Lithium Isotope Geochemistry in the Barton Peninsula, King George Island, Antarctica |
title_sort |
lithium isotope geochemistry in the barton peninsula, king george island, antarctica |
publisher |
HAL CCSD |
publishDate |
2022 |
url |
https://hal.archives-ouvertes.fr/hal-03864326 https://hal.archives-ouvertes.fr/hal-03864326/document https://hal.archives-ouvertes.fr/hal-03864326/file/Ryu2022Frontiers.pdf https://doi.org/10.3389/feart.2022.913687 |
long_lat |
ENVELOPE(-58.733,-58.733,-62.233,-62.233) ENVELOPE(-58.741,-58.741,-62.227,-62.227) |
geographic |
Barton Barton Peninsula King George Island |
geographic_facet |
Barton Barton Peninsula King George Island |
genre |
Antarc* Antarctica King George Island |
genre_facet |
Antarc* Antarctica King George Island |
op_source |
ISSN: 2296-6463 Frontiers in Earth Science https://hal.archives-ouvertes.fr/hal-03864326 Frontiers in Earth Science, 2022, 10, ⟨10.3389/feart.2022.913687⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3389/feart.2022.913687 hal-03864326 https://hal.archives-ouvertes.fr/hal-03864326 https://hal.archives-ouvertes.fr/hal-03864326/document https://hal.archives-ouvertes.fr/hal-03864326/file/Ryu2022Frontiers.pdf doi:10.3389/feart.2022.913687 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.3389/feart.2022.913687 |
container_title |
Frontiers in Earth Science |
container_volume |
10 |
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1766266956020711424 |