Hydrochemical and isotopic characteristics and genesis of geothermal fluids in the Maojingba geothermal field, northern Chengde city

• Published in: Shuiwen Dizhi Gongcheng Dizhi Vol. 51; no. 1; pp. 224 - 236
• Main Authors: Jumei PANG, Yingnan WANG, Aifang JIN, Hai SHAO, Zhiqiang YIN, Liqin WAN, Xiulan YIN, Jun YU
• Format: Journal Article
• Language: Chinese
• Published: Editorial Office of Hydrogeology & Engineering Geology 01-01-2024
• Subjects: age of geothermal water; fluid circulation; maojingba geothermal field; sulfur; thermal storage temperature
• ISSN: 1000-3665
• DOI: 10.16030/j.cnki.issn.1000-3665.202205008

The temperature of geothermal water exposed on the surface in the Maojingba area, northern Chengde city, can reach up to 98.7 °C, mostly occurring in the Jurassic coarse-grained diorite with well-developed fractures and high \begin{document}${\mathrm{SO}}_4^{2-} $\end{document} content. However, few studies on the recharge, evolution, and genetic mechanism of the geothermal fluids in this area. In order to understand the genesis of the geothermal system in the bedrock mountain area and evaluate its development and utilization potential, this study, based on the regional geothermal geological survey, tested and analyzed the hydrochemical composition of different water bodies, groundwater dating isotopes (3H and 14C), sulfur and oxygen isotopes in sulfate (δ34S-\begin{document}${\mathrm{SO}}_4^{2-} $\end{document} and δ18O-\begin{document}${\mathrm{SO}}_4^{2-} $\end{document}), carbon isotopes (δ13C-\begin{document}${\mathrm{HCO}}_3^- $\end{document}) and strontium isotope (87Sr and 86Sr) to explore the fluid g