气候变化领域集成服务门户(CCPortal): 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

CCPortal

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
	Li, Bo; Kong, Qingmin; Liao, Fu; Wang, Guangcai; Liu, Fei; Guo, Liang; Liu, Chenglong; Shi, Zheming
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/301724
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	Li, Bo,Kong, Qingmin,Liao, Fu,et al. 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	Li, Bo.,Kong, Qingmin.,Liao, Fu.,Wang, Guangcai.,Liu, Fei.,...&Shi, Zheming.(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	Li, Bo,et al."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).