Lithium Isotope Geochemistry in the Barton Peninsula, King George Island, Antarctica
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...
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Online Access: | http://dx.doi.org/10.3389/feart.2022.913687 https://www.frontiersin.org/articles/10.3389/feart.2022.913687/full |
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crfrontiers:10.3389/feart.2022.913687 2024-02-11T09:57:48+01:00 Lithium Isotope Geochemistry in the Barton Peninsula, King George Island, Antarctica Ryu, Jong-Sik Lim, Hyoun Soo Choi, Hye-Bin Kim, Ji-Hoon Kim, Ok-Sun Vigier, Nathalie National Research Foundation of Korea Korea Polar Research Institute Korea Basic Science Institute 2022 http://dx.doi.org/10.3389/feart.2022.913687 https://www.frontiersin.org/articles/10.3389/feart.2022.913687/full unknown Frontiers Media SA https://creativecommons.org/licenses/by/4.0/ Frontiers in Earth Science volume 10 ISSN 2296-6463 General Earth and Planetary Sciences journal-article 2022 crfrontiers https://doi.org/10.3389/feart.2022.913687 2024-01-26T10:06:24Z 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 Frontiers (Publisher) 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 |
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Frontiers (Publisher) |
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language |
unknown |
topic |
General Earth and Planetary Sciences |
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General Earth and Planetary Sciences Ryu, Jong-Sik Lim, Hyoun Soo Choi, Hye-Bin Kim, Ji-Hoon Kim, Ok-Sun Vigier, Nathalie Lithium Isotope Geochemistry in the Barton Peninsula, King George Island, Antarctica |
topic_facet |
General Earth and Planetary Sciences |
description |
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 |
National Research Foundation of Korea Korea Polar Research Institute Korea Basic Science Institute |
format |
Article in Journal/Newspaper |
author |
Ryu, Jong-Sik Lim, Hyoun Soo Choi, Hye-Bin Kim, Ji-Hoon Kim, Ok-Sun Vigier, Nathalie |
author_facet |
Ryu, Jong-Sik Lim, Hyoun Soo 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 |
Frontiers Media SA |
publishDate |
2022 |
url |
http://dx.doi.org/10.3389/feart.2022.913687 https://www.frontiersin.org/articles/10.3389/feart.2022.913687/full |
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 |
Frontiers in Earth Science volume 10 ISSN 2296-6463 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.3389/feart.2022.913687 |
container_title |
Frontiers in Earth Science |
container_volume |
10 |
_version_ |
1790593343314460672 |