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DOI	10.1186/s40517-023-00263-5
	Geochemical and H-O-Sr-B isotope signatures of Yangyi geothermal fields: implications for the evolution of thermal fluids in fracture-controlled type geothermal system, Tibet, China
	Cao, Rui; Dor, Ji; Cai, YongQiang; Chen, XiaoLin; Mao, Xiang; Meng, Hui-ren
发表日期	2023
ISSN	2195-9706
卷号	11 期号:1
英文摘要	High-temperature hydrothermal systems are mainly distributed in the north-south graben systems of southern Tibet as an important part of the Mediterranean-Tethys Himalayan geothermal belt in mainland China. As the largest unit capacity and second stable operating geothermal power station in China, Yangyi is the fracture-controlled type geothermal field in the center of Yadong-Gulu Graben. In this paper, hydrogeological and hydrochemical characteristics, isotope composition (& delta;D and & delta;O-18, Sr-87/Sr-86 and & delta;B-11) of borehole water, hot springs, and surface river samples were analyzed. From the conservative elements (such as Cl- and Li+) and & delta;D and & delta;O-18 values, the geothermal water of the Yangyi high-temperature geothermal field is estimated to be of meteoric origin with the contributions of chemical components of the magmatic fluid, which is provided by partially molten granite as a shallow magmatic heat source. According to logging data, the geothermal gradient and terrestrial heat flow value of the Yangyi high-temperature geothermal field are 6.48 celcius/100 m and 158.37 mW m(-2), respectively. Combining the hydrothermal tracer experiment, Sr-87/Sr-86 and & delta;B-11 ratios obtained with gradually decreasing reservoir temperatures from the Bujiemu stream geothermal zone to Qialagai stream geothermal zone, we suggested the deep geothermal waters were mixed with local cold groundwater and then flow northeastward, forming the shallow reservoir within the crushed zone and intersect spot of faults in the Himalayan granitoid. Furthermore, in the process of ascent, the geothermal water is enriched in K+, Na+, and HCO3- during the interaction with underlying Himalayan granitoid and pyroclastic rocks that occur as wall rocks. The detailed description and extensive discussion are of great significance for the further exploitation and utilization of north-south trending geothermal belts in Tibet.
关键词	Yangyi geothermal fields Water-rock reaction Evolution of thermal fluids Tibet
英文关键词	HYDROTHERMAL AREAS; HOT-SPRINGS; NA-K; BORON; WATERS; TOURMALINE; ORIGIN; IMPACT; EXTENSION; VALLEY
WOS研究方向	Energy & Fuels ; Geosciences, Multidisciplinary
WOS记录号	WOS:001042637000001
来源期刊	GEOTHERMAL ENERGY
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/282749
作者单位	Chengdu University of Technology; Tibet University; Sinopec
推荐引用方式 GB/T 7714	Cao, Rui,Dor, Ji,Cai, YongQiang,et al. Geochemical and H-O-Sr-B isotope signatures of Yangyi geothermal fields: implications for the evolution of thermal fluids in fracture-controlled type geothermal system, Tibet, China[J],2023,11(1).
APA	Cao, Rui,Dor, Ji,Cai, YongQiang,Chen, XiaoLin,Mao, Xiang,&Meng, Hui-ren.(2023).Geochemical and H-O-Sr-B isotope signatures of Yangyi geothermal fields: implications for the evolution of thermal fluids in fracture-controlled type geothermal system, Tibet, China.GEOTHERMAL ENERGY,11(1).
MLA	Cao, Rui,et al."Geochemical and H-O-Sr-B isotope signatures of Yangyi geothermal fields: implications for the evolution of thermal fluids in fracture-controlled type geothermal system, Tibet, China".GEOTHERMAL ENERGY 11.1(2023).