Lithium Isotope Geochemistry in the Barton Peninsula, King George Island, Antarctica
Lithium (Li) has two stable isotopes, 6Li and 7Li, 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 P...
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ftdoajarticles:oai:doaj.org/article:674edef2376e4bd0a40a768c4300812a 2023-05-15T14:03:41+02:00 Lithium Isotope Geochemistry in the Barton Peninsula, King George Island, Antarctica Jong-Sik Ryu Hyoun Soo Lim Hye-Bin Choi Ji-Hoon Kim Ok-Sun Kim Nathalie Vigier 2022-07-01T00:00:00Z https://doi.org/10.3389/feart.2022.913687 https://doaj.org/article/674edef2376e4bd0a40a768c4300812a EN eng Frontiers Media S.A. https://www.frontiersin.org/articles/10.3389/feart.2022.913687/full https://doaj.org/toc/2296-6463 2296-6463 doi:10.3389/feart.2022.913687 https://doaj.org/article/674edef2376e4bd0a40a768c4300812a Frontiers in Earth Science, Vol 10 (2022) Li isotopes chemical weathering meltwater mineral neoformation Antarctica Science Q article 2022 ftdoajarticles https://doi.org/10.3389/feart.2022.913687 2022-12-31T02:21:49Z Lithium (Li) has two stable isotopes, 6Li and 7Li, 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. δ7Li 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 δ7Li values, rather than a mixing with sea salt inputs from atmosphere or ice melting. Likewise, δ7Li 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 δ7Li values in meltwater with intense water-rock interactions. Article in Journal/Newspaper Antarc* Antarctica King George Island Directory of Open Access Journals: DOAJ Articles King George Island Barton ENVELOPE(-58.733,-58.733,-62.233,-62.233) Barton Peninsula ENVELOPE(-58.741,-58.741,-62.227,-62.227) Frontiers in Earth Science 10 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Li isotopes chemical weathering meltwater mineral neoformation Antarctica Science Q |
spellingShingle |
Li isotopes chemical weathering meltwater mineral neoformation Antarctica Science Q Jong-Sik Ryu Hyoun Soo Lim Hye-Bin Choi Ji-Hoon Kim Ok-Sun Kim Nathalie Vigier Lithium Isotope Geochemistry in the Barton Peninsula, King George Island, Antarctica |
topic_facet |
Li isotopes chemical weathering meltwater mineral neoformation Antarctica Science Q |
description |
Lithium (Li) has two stable isotopes, 6Li and 7Li, 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. δ7Li 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 δ7Li values, rather than a mixing with sea salt inputs from atmosphere or ice melting. Likewise, δ7Li 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 δ7Li values in meltwater with intense water-rock interactions. |
format |
Article in Journal/Newspaper |
author |
Jong-Sik Ryu Hyoun Soo Lim Hye-Bin Choi Ji-Hoon Kim Ok-Sun Kim Nathalie Vigier |
author_facet |
Jong-Sik Ryu Hyoun Soo Lim Hye-Bin Choi Ji-Hoon Kim Ok-Sun Kim Nathalie Vigier |
author_sort |
Jong-Sik Ryu |
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 S.A. |
publishDate |
2022 |
url |
https://doi.org/10.3389/feart.2022.913687 https://doaj.org/article/674edef2376e4bd0a40a768c4300812a |
long_lat |
ENVELOPE(-58.733,-58.733,-62.233,-62.233) ENVELOPE(-58.741,-58.741,-62.227,-62.227) |
geographic |
King George Island Barton Barton Peninsula |
geographic_facet |
King George Island Barton Barton Peninsula |
genre |
Antarc* Antarctica King George Island |
genre_facet |
Antarc* Antarctica King George Island |
op_source |
Frontiers in Earth Science, Vol 10 (2022) |
op_relation |
https://www.frontiersin.org/articles/10.3389/feart.2022.913687/full https://doaj.org/toc/2296-6463 2296-6463 doi:10.3389/feart.2022.913687 https://doaj.org/article/674edef2376e4bd0a40a768c4300812a |
op_doi |
https://doi.org/10.3389/feart.2022.913687 |
container_title |
Frontiers in Earth Science |
container_volume |
10 |
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1766274497204191232 |