通过对张渤断裂带山东东部地区温泉/地热井采样,测试水样主量元素和氢氧同位素,进行水文地球化学特征分析,结果表明:①地热水化学类型主要有Ca-HCO3、Na-Cl、Na-HCO3、Na-SO4.② δD、δ18 O 的测值范围分别为-39.90‰～-68.00‰和-5.00‰～-8.50‰,均落在中国大气降水线和中国东部地区大气降水线下方附近,说明地热水来源为大气降水.计算得到研究区地热水最小循环深度为1183 m,最大循环深度为4 271 m,补给高程大致变化范围为430.0～1366.6 m.③γNa/γCl变化范围在0.509～38.37,其中临朐揽翠湖、磁山温泉变质系数相对较高,表明受矿物溶滤作用较大.④Na-K-Mg三角图表明地热水样大多为部分平衡水,仅有高青县御泉汤温泉为平衡水.
The Geochemical Characteristics Analysis of Geothermal Water in Eastern Shandong Province of the Zhangbo Fault Zone
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 calcu-lation,the minimum circulation depth in the study area of hot springs is 1 183 m,the max-imum circulation depth is 4 271 m,and the general variation range of recharge elevation is 430.0～1 366.6 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 tri-angle diagram shows that most of the hot springs water samples are partially mature wa-ter,only the Yuquan hot spring in Gaoqing County being equilibrium water.
Zhangbo fault zoneEastern ShandongGeothermal waterGeochemical characteristicsHydrogen and oxygen isotopes
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