Estimation of the depth of origin of fluids using noble gases in the surface sediments of submarine mud volcanoes off Tanegashima Island
Abstract The helium isotope ratio (3He/4He), concentration ratio of neon-20 to helium-4 (20Ne/4He), argon (Ar), krypton (Kr), and xenon (Xe) concentrations were measured in the porewater of surface sediments of several submarine mud volcanoes. From the 3He/4He values (0.18–0.93RA), the estimated He...
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| Format: | Article |
| Language: | English |
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Nature Portfolio
2023-04-01
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| Series: | Scientific Reports |
| Online Access: | https://doi.org/10.1038/s41598-023-31582-z |
| _version_ | 1797850124891717632 |
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| author | Yuki Mitsutome Tomohiro Toki Takanori Kagoshima Yuji Sano Yama Tomonaga Akira Ijiri |
| author_facet | Yuki Mitsutome Tomohiro Toki Takanori Kagoshima Yuji Sano Yama Tomonaga Akira Ijiri |
| author_sort | Yuki Mitsutome |
| collection | DOAJ |
| description | Abstract The helium isotope ratio (3He/4He), concentration ratio of neon-20 to helium-4 (20Ne/4He), argon (Ar), krypton (Kr), and xenon (Xe) concentrations were measured in the porewater of surface sediments of several submarine mud volcanoes. From the 3He/4He values (0.18–0.93RA), the estimated He origin is almost 90% crustal He, with little contribution from mantle-derived He. The determined Ar, Kr, and Xe concentrations lie within the solubility equilibrium range expected for temperatures from 83 °C up to 230 °C and are consistent with the temperature range of the dehydration origin of clay minerals. Considering the geothermal gradient in the investigated region (25 °C/km), these gases are considered to have reached dissolution equilibrium at a depth of about 3.3 km to 9.2 km below the seafloor. As the depth of the plate boundary is 18 km below the seafloor, the noble gas signatures are likely to originate from the crust, not from the plate boundary. This is consistent with the results presented by the He isotope ratios. |
| first_indexed | 2024-04-09T18:56:23Z |
| format | Article |
| id | doaj.art-c8467a52c27948f8b163ec874a509ec3 |
| institution | Directory Open Access Journal |
| issn | 2045-2322 |
| language | English |
| last_indexed | 2024-04-09T18:56:23Z |
| publishDate | 2023-04-01 |
| publisher | Nature Portfolio |
| record_format | Article |
| series | Scientific Reports |
| spelling | doaj.art-c8467a52c27948f8b163ec874a509ec32023-04-09T11:12:30ZengNature PortfolioScientific Reports2045-23222023-04-0113111210.1038/s41598-023-31582-zEstimation of the depth of origin of fluids using noble gases in the surface sediments of submarine mud volcanoes off Tanegashima IslandYuki Mitsutome0Tomohiro Toki1Takanori Kagoshima2Yuji Sano3Yama Tomonaga4Akira Ijiri5Chemistry Biology and Marine Science, Graduate School of Science and Engineering, University of the RyukyusDepartment of Chemistry, Biology and Marine Science, Faculty of Science, University of the RyukyusGraduate School of Science and Engineering, University of ToyamaAtmosphere and Ocean Research Institute, The University of TokyoEawag, Swiss Federal Institute of Aquatic Science and TechnologyGraduate School of Maritime Sciences, Kobe UniversityAbstract The helium isotope ratio (3He/4He), concentration ratio of neon-20 to helium-4 (20Ne/4He), argon (Ar), krypton (Kr), and xenon (Xe) concentrations were measured in the porewater of surface sediments of several submarine mud volcanoes. From the 3He/4He values (0.18–0.93RA), the estimated He origin is almost 90% crustal He, with little contribution from mantle-derived He. The determined Ar, Kr, and Xe concentrations lie within the solubility equilibrium range expected for temperatures from 83 °C up to 230 °C and are consistent with the temperature range of the dehydration origin of clay minerals. Considering the geothermal gradient in the investigated region (25 °C/km), these gases are considered to have reached dissolution equilibrium at a depth of about 3.3 km to 9.2 km below the seafloor. As the depth of the plate boundary is 18 km below the seafloor, the noble gas signatures are likely to originate from the crust, not from the plate boundary. This is consistent with the results presented by the He isotope ratios.https://doi.org/10.1038/s41598-023-31582-z |
| spellingShingle | Yuki Mitsutome Tomohiro Toki Takanori Kagoshima Yuji Sano Yama Tomonaga Akira Ijiri Estimation of the depth of origin of fluids using noble gases in the surface sediments of submarine mud volcanoes off Tanegashima Island Scientific Reports |
| title | Estimation of the depth of origin of fluids using noble gases in the surface sediments of submarine mud volcanoes off Tanegashima Island |
| title_full | Estimation of the depth of origin of fluids using noble gases in the surface sediments of submarine mud volcanoes off Tanegashima Island |
| title_fullStr | Estimation of the depth of origin of fluids using noble gases in the surface sediments of submarine mud volcanoes off Tanegashima Island |
| title_full_unstemmed | Estimation of the depth of origin of fluids using noble gases in the surface sediments of submarine mud volcanoes off Tanegashima Island |
| title_short | Estimation of the depth of origin of fluids using noble gases in the surface sediments of submarine mud volcanoes off Tanegashima Island |
| title_sort | estimation of the depth of origin of fluids using noble gases in the surface sediments of submarine mud volcanoes off tanegashima island |
| url | https://doi.org/10.1038/s41598-023-31582-z |
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