Monitoring of magmatic–hydrothermal system by noble gas and carbon isotopic compositions of fumarolic gases

We repeatedly measured isotopic compositions of noble gases and CO(2) in volcanic gases sampled at six fumaroles around the Kusatsu-Shirane volcano (Japan) between 2014 and 2021 to detect variations reflecting recent volcanic activity. The synchronous increases in (3)He/(4)He at some fumaroles sugge...

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Autores principales: Obase, Tomoya, Sumino, Hirochika, Toyama, Kotaro, Kawana, Kaori, Yamane, Kohei, Yaguchi, Muga, Terada, Akihiko, Ohba, Takeshi
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nature Publishing Group UK 2022
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Article
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9678900/
https://www.ncbi.nlm.nih.gov/pubmed/36411294
http://dx.doi.org/10.1038/s41598-022-22280-3
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author Obase, Tomoya
Sumino, Hirochika
Toyama, Kotaro
Kawana, Kaori
Yamane, Kohei
Yaguchi, Muga
Terada, Akihiko
Ohba, Takeshi
author_facet Obase, Tomoya
Sumino, Hirochika
Toyama, Kotaro
Kawana, Kaori
Yamane, Kohei
Yaguchi, Muga
Terada, Akihiko
Ohba, Takeshi
author_sort Obase, Tomoya
collection PubMed
description We repeatedly measured isotopic compositions of noble gases and CO(2) in volcanic gases sampled at six fumaroles around the Kusatsu-Shirane volcano (Japan) between 2014 and 2021 to detect variations reflecting recent volcanic activity. The synchronous increases in (3)He/(4)He at some fumaroles suggest an increase in magmatic gas supply since 2018. The increase in magmatic gas supply is also supported by the temporal variations in (3)He/CO(2) ratios and carbon isotopic ratios of CO(2). The (3)He/(40)Ar* ratios ((40)Ar*: magmatic (40)Ar) show significant increases in the period of high (3)He/(4)He ratios. The temporal variation in (3)He/(40)Ar* ratios may reflect changes in magma vesicularity. Therefore, the (3)He/(40)Ar* ratio of fumarolic gases is a useful parameter to monitor the current state of degassing magma, which is essential for understanding the deep process of volcanic unrest and may contribute to identifying precursors of a future eruption. These results provide additional validation for the use of noble gas and carbon isotopic compositions of fumarolic gases for monitoring magmatic–hydrothermal systems.
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spelling pubmed-96789002022-11-23 Monitoring of magmatic–hydrothermal system by noble gas and carbon isotopic compositions of fumarolic gases Obase, Tomoya Sumino, Hirochika Toyama, Kotaro Kawana, Kaori Yamane, Kohei Yaguchi, Muga Terada, Akihiko Ohba, Takeshi Sci Rep Article We repeatedly measured isotopic compositions of noble gases and CO(2) in volcanic gases sampled at six fumaroles around the Kusatsu-Shirane volcano (Japan) between 2014 and 2021 to detect variations reflecting recent volcanic activity. The synchronous increases in (3)He/(4)He at some fumaroles suggest an increase in magmatic gas supply since 2018. The increase in magmatic gas supply is also supported by the temporal variations in (3)He/CO(2) ratios and carbon isotopic ratios of CO(2). The (3)He/(40)Ar* ratios ((40)Ar*: magmatic (40)Ar) show significant increases in the period of high (3)He/(4)He ratios. The temporal variation in (3)He/(40)Ar* ratios may reflect changes in magma vesicularity. Therefore, the (3)He/(40)Ar* ratio of fumarolic gases is a useful parameter to monitor the current state of degassing magma, which is essential for understanding the deep process of volcanic unrest and may contribute to identifying precursors of a future eruption. These results provide additional validation for the use of noble gas and carbon isotopic compositions of fumarolic gases for monitoring magmatic–hydrothermal systems. Nature Publishing Group UK 2022-11-21 /pmc/articles/PMC9678900/ /pubmed/36411294 http://dx.doi.org/10.1038/s41598-022-22280-3 Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Article
Obase, Tomoya
Sumino, Hirochika
Toyama, Kotaro
Kawana, Kaori
Yamane, Kohei
Yaguchi, Muga
Terada, Akihiko
Ohba, Takeshi
Monitoring of magmatic–hydrothermal system by noble gas and carbon isotopic compositions of fumarolic gases
title Monitoring of magmatic–hydrothermal system by noble gas and carbon isotopic compositions of fumarolic gases
title_full Monitoring of magmatic–hydrothermal system by noble gas and carbon isotopic compositions of fumarolic gases
title_fullStr Monitoring of magmatic–hydrothermal system by noble gas and carbon isotopic compositions of fumarolic gases
title_full_unstemmed Monitoring of magmatic–hydrothermal system by noble gas and carbon isotopic compositions of fumarolic gases
title_short Monitoring of magmatic–hydrothermal system by noble gas and carbon isotopic compositions of fumarolic gases
title_sort monitoring of magmatic–hydrothermal system by noble gas and carbon isotopic compositions of fumarolic gases
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9678900/
https://www.ncbi.nlm.nih.gov/pubmed/36411294
http://dx.doi.org/10.1038/s41598-022-22280-3
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