Stable isotopes and hydrogeochemical evolutions of groundwater from a typical seismic fault zone in the Mt. Lushan region, Eastern China
We analyzed the major chemical components, hydrogen (δD) and oxygen isotopes (δ18O), and tritium activity in groundwater from Jiujiang well number 2 (JJ2) as well as atmospheric precipitation and water from the Maweishui spring and Tianhuajing reservoir in the Mt. Lushan region, Eastern China. The r...
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Frontiers Media S.A.
2023-12-01
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| Series: | Frontiers in Earth Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/feart.2023.1285136/full |
| _version_ | 1827397122362703872 |
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| author | Zhicheng Bao Le Hu Jian Xiao Xiaohui Zha Jian Lv Ying Zhao |
| author_facet | Zhicheng Bao Le Hu Jian Xiao Xiaohui Zha Jian Lv Ying Zhao |
| author_sort | Zhicheng Bao |
| collection | DOAJ |
| description | We analyzed the major chemical components, hydrogen (δD) and oxygen isotopes (δ18O), and tritium activity in groundwater from Jiujiang well number 2 (JJ2) as well as atmospheric precipitation and water from the Maweishui spring and Tianhuajing reservoir in the Mt. Lushan region, Eastern China. The results show that the water in JJ2 is of the HCO3-Ca·Mg type, with ionic components mainly arising from calcite and dolomite mineral dissolution. According to the δD and δ18O data, the groundwater of JJ2 mainly comes from atmospheric precipitation, and the recharge elevation is 554 m. Results for tritium activity indicate that JJ2 is fed by both an ancient water supply and a new water supply within a period of 10 years. These results demonstrate that JJ2 has characteristics of both shallow and deep circulating water, which implies that aquifers involving two different recharge sources rise to the well surface via different circulation paths. That is exactly why JJ2 is tectonically sensitive and could display a remarkable gas radon anomaly before the Ruichang-Yangxin ML 5.0 earthquake in 2011. Our results also indicate that ascertaining the hydrological characteristics and cycling process of groundwater are crucial for understanding the earthquake anomalies and judging whether a seismic groundwater monitoring well is reliable or not. |
| first_indexed | 2024-03-08T19:02:41Z |
| format | Article |
| id | doaj.art-496f3205dc1b4080975874d1c762be3e |
| institution | Directory Open Access Journal |
| issn | 2296-6463 |
| language | English |
| last_indexed | 2024-03-08T19:02:41Z |
| publishDate | 2023-12-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Earth Science |
| spelling | doaj.art-496f3205dc1b4080975874d1c762be3e2023-12-28T04:11:08ZengFrontiers Media S.A.Frontiers in Earth Science2296-64632023-12-011110.3389/feart.2023.12851361285136Stable isotopes and hydrogeochemical evolutions of groundwater from a typical seismic fault zone in the Mt. Lushan region, Eastern ChinaZhicheng Bao0Le Hu1Jian Xiao2Xiaohui Zha3Jian Lv4Ying Zhao5Jiangxi Earthquake Angecy, Nanchang, ChinaInstitute of Earthquake Forecasting, China Earthquake Administration, Beijing, ChinaJiangxi Earthquake Angecy, Nanchang, ChinaJiangxi Earthquake Angecy, Nanchang, ChinaJiangxi Earthquake Angecy, Nanchang, ChinaJiangxi Earthquake Angecy, Nanchang, ChinaWe analyzed the major chemical components, hydrogen (δD) and oxygen isotopes (δ18O), and tritium activity in groundwater from Jiujiang well number 2 (JJ2) as well as atmospheric precipitation and water from the Maweishui spring and Tianhuajing reservoir in the Mt. Lushan region, Eastern China. The results show that the water in JJ2 is of the HCO3-Ca·Mg type, with ionic components mainly arising from calcite and dolomite mineral dissolution. According to the δD and δ18O data, the groundwater of JJ2 mainly comes from atmospheric precipitation, and the recharge elevation is 554 m. Results for tritium activity indicate that JJ2 is fed by both an ancient water supply and a new water supply within a period of 10 years. These results demonstrate that JJ2 has characteristics of both shallow and deep circulating water, which implies that aquifers involving two different recharge sources rise to the well surface via different circulation paths. That is exactly why JJ2 is tectonically sensitive and could display a remarkable gas radon anomaly before the Ruichang-Yangxin ML 5.0 earthquake in 2011. Our results also indicate that ascertaining the hydrological characteristics and cycling process of groundwater are crucial for understanding the earthquake anomalies and judging whether a seismic groundwater monitoring well is reliable or not.https://www.frontiersin.org/articles/10.3389/feart.2023.1285136/fullhydrogeochemistrystable isotopetritium activitygeochemical characteristicsradon anomaly |
| spellingShingle | Zhicheng Bao Le Hu Jian Xiao Xiaohui Zha Jian Lv Ying Zhao Stable isotopes and hydrogeochemical evolutions of groundwater from a typical seismic fault zone in the Mt. Lushan region, Eastern China Frontiers in Earth Science hydrogeochemistry stable isotope tritium activity geochemical characteristics radon anomaly |
| title | Stable isotopes and hydrogeochemical evolutions of groundwater from a typical seismic fault zone in the Mt. Lushan region, Eastern China |
| title_full | Stable isotopes and hydrogeochemical evolutions of groundwater from a typical seismic fault zone in the Mt. Lushan region, Eastern China |
| title_fullStr | Stable isotopes and hydrogeochemical evolutions of groundwater from a typical seismic fault zone in the Mt. Lushan region, Eastern China |
| title_full_unstemmed | Stable isotopes and hydrogeochemical evolutions of groundwater from a typical seismic fault zone in the Mt. Lushan region, Eastern China |
| title_short | Stable isotopes and hydrogeochemical evolutions of groundwater from a typical seismic fault zone in the Mt. Lushan region, Eastern China |
| title_sort | stable isotopes and hydrogeochemical evolutions of groundwater from a typical seismic fault zone in the mt lushan region eastern china |
| topic | hydrogeochemistry stable isotope tritium activity geochemical characteristics radon anomaly |
| url | https://www.frontiersin.org/articles/10.3389/feart.2023.1285136/full |
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