Abstract
The Songshan hot spring occurs in granite in Yanqing County in northwestern Beijing, China. TDS of the hot water ranges from 459 to 475 mg/L and pH varies between 8.6 and 9.13. The water is of Na–SO4 type. Isotopic analyses indicate that the hot spring is meteoric in origin and receives recharge from precipitation in the northern and northwestern granite mountain with elevation of about 1,600–1,800 m. The depth of circulation of the thermal groundwater is estimated to be 2,240 m below the spring’s threshold and the temperature of the geothermal reservoir, 76°C. The residence time of the thermal groundwater is estimated to be about 52 years. A flowing well near the spring has chemical compositions and formation conditions similar to the spring. The discharge of the flowing well is approximately eighteen times larger than that of the spring and the residence time of the former (about 15.4 years) is about three times smaller than that of the latter. Although the well and spring are close to each other, the well’s larger flow rates, indicated residence time and high hydraulic head suggest that the well taps a separate, but genetically similar flow system.
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This work was cooperatively supported by the Natural Science Foundation of Beijing (8042019), the Natural Science Foundation of China (40572147) and the Construction Plan for the Co-Construction Subjects from the Education Committee of Beijing (JD104910555).
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Xun, Z., Juan, L., Haiyan, Z. et al. Increase in thermal groundwater due to a flowing well near the Songshan hot spring in Beijing, China. Environ Geol 53, 1405–1411 (2008). https://doi.org/10.1007/s00254-007-0749-z
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DOI: https://doi.org/10.1007/s00254-007-0749-z