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| DOI | 10.1016/j.geothermics.2024.102931 |
| Sulphur evolution in acidic and alkaline geothermal water related to magma in the Rehai geothermal field in the southeastern Tibet Plateau based on stable hydrogen, oxygen, sulphur isotopes | |
| 发表日期 | 2024 |
| ISSN | 0375-6505 |
| EISSN | 1879-3576 |
| 起始页码 | 119 |
| 卷号 | 119 |
| 英文摘要 | Sulphur (S) evolution is an essential and complex process in hydrothermal systems related to magmatic heat sources. Understanding sulphur isotope changes in different thermal waters could help decipher these processes and provide insight into hydrothermal evolution and magmatic influence. In this study, acidic and alkaline geothermal spring samples were collected from the Rehai geothermal field to identify the sources and transformations of sulphur in distinct aquatic environments. Rehai is the only hydrothermal system on the Chinese mainland and is directly affected by magma heat sources, with extensive exposure of highly acidic springs. The results show that the sulphate in deep geothermal water mainly originates from the oxidation of mantle-derived sulphide, followed by thermochemical sulphate reduction during ascent, bringing about isotope fractionation, that is the delta S-34-SO4 of alkaline water exceeding that of acidic water whose delta S-34 is close to that of mantle-derived sulphur (similar to 0 parts per thousand). Steam and gases separate from alkaline water at approximately 150 degrees C, which heats shallow cold water to form acidic springs. Phase separation may also affect the sulphide isotope composition of the vapour. The acidic environment formed by the oxidation of H2S promotes intensive hydrothermal alteration, resulting in a notable 18O-H2O shift. Based on the collected data, the degree of isotopic fractionation in the different periods (stable and active periods of magma input) varied. The parent geothermal water in the active period may absorb more heat and reduced sulphur, and undergo more extensive redox reactions, yielding greater isotope fractionation. The present study on sulphur evolution suggests that changes in the SO4/Cl and sulphur isotopes of alkaline springs in magma-impacted hydrothermal systems could potentially indicate the influx of magmatic volatiles. |
| 英文关键词 | Sulphur evolution; Stable isotopes; Magmatic origin; Hydrothermal system; Acidic and alkaline springs |
| 语种 | 英语 |
| WOS研究方向 | Energy & Fuels ; Geology |
| WOS类目 | Energy & Fuels ; Geosciences, Multidisciplinary |
| WOS记录号 | WOS:001177756400001 |
| 来源期刊 | GEOTHERMICS
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/301723 |
| 作者单位 | China University of Geosciences; China University of Geosciences; China Earthquake Administration; Chinese Academy of Sciences |
| 推荐引用方式 GB/T 7714 | . Sulphur evolution in acidic and alkaline geothermal water related to magma in the Rehai geothermal field in the southeastern Tibet Plateau based on stable hydrogen, oxygen, sulphur isotopes[J],2024,119. |
| APA | (2024).Sulphur evolution in acidic and alkaline geothermal water related to magma in the Rehai geothermal field in the southeastern Tibet Plateau based on stable hydrogen, oxygen, sulphur isotopes.GEOTHERMICS,119. |
| MLA | "Sulphur evolution in acidic and alkaline geothermal water related to magma in the Rehai geothermal field in the southeastern Tibet Plateau based on stable hydrogen, oxygen, sulphur isotopes".GEOTHERMICS 119(2024). |
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