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EARTHQUAKE ›› 2024, Vol. 44 ›› Issue (3): 21-37.doi: 10.12196/j.issn.1000-3274.2024.03.002

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The Geochemical Characteristics Analysis of Geothermal Water in Eastern Shandong Province of the Zhangbo Fault Zone

CHEN Qi-feng1, LI Ying2, ZHANG Fan3, SUN Yu-fei3, JIA Zhen1, DU Gui-lin4, CAO Yi1, FENG En-guo1   

  1. 1. Liaocheng Earthquake Monitoring Central Station of Shandong Earthquake Agency, Liaocheng 252000, China;
    2. Key Laboratory of Earthquake Prediction, Institute of Earthquake Forecasting, China Earthquake Administration, Beijing 100036, China;
    3. Zhangjiakou Earthquake Monitoring Center Station, Zhangjiakou 075000, China;
    4. Weihai Earthquake Monitoring Center, Weihai 264200, China
  • Received:2024-04-15 Accepted:2024-06-12 Online:2024-07-31 Published:2024-08-28

Abstract: The hydrogeochemical characteristics are studied by sampling geothermal hot springs/geothermal wells in eastern Shandong of the Zhangbo fault zone,measuring the main elements and hydrogen and oxygen isotopes of water samples. The results show that: ① The main chemical types of hot spring water are Ca-HCO3, Na-Cl, Na-HCO3, Na-SO4. ② The measured values of δD and δ18O are -39.90%~-68. 00% and -5.00%~-8.50%,which fell near the meteoric water line in China and the meteoric water line in eastern China, indicating that the hot springs was meteoric water. According to the calculation, the minimum circulation depth in the study area of hot springs is 1183 m, the maximum circulation depth is 4271 m, and the general variation range of recharge elevation is 430.0~1366.6 m. ③ The variation range of γNa/γCl in Shandong region is 0.509~38.37,among which, the metamorphism coefficient of Linqulan Cuihu and Cishan hot spring are relatively high, that indicate that it is affected by mineral leaching. ④ The Na-K-Mg triangle diagram shows that most of the hot springs water samples are partially mature water, only the Yuquan hot spring in Gaoqing County being equilibrium water.

Key words: Zhangbo fault zone, Eastern Shandong, Geothermal water, Geochemical characteristics, Hydrogen and oxygen isotopes

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