苏北盆地地下水补给源问题讨论

Discussion on recharge source of groundwater in Subei Basin

分析对比地下水和地表水中的碳酸氢根含量,推测深部CO_2释放造成碳库中的"死碳"混入地下水中,因此14C定年不适用于苏北盆地。通过氚分析确定地下水的循环周期约为40 a,氚与氢氧同位素数据都不支持地下水来自长江渗漏水侧向补给的结论。结合水文地质证据,推断苏北承压水可能接受深循环地下水越流补给,隐伏火山口与断裂带可能是地下水的排泄通道。

Analyzing and comparing the concentration of bicarbonate in groundwater and surface water,the author of this paper presumed that the release of deep CO2 causes the dead carbon in the carbon stock to be mixed into underground water,suggesting that the14 C dating method is not suitable for groundwater dating in the Subei Basin.The cycle of groundwater determined by tritium analysis is about 40 a,and the hydrogen and oxygen isotopes also do not support the hypothesis that the groundwater originates from lateral recharge of groundwater from the Yangtze River. Combined with the evidence of hydrogeology,it is concluded that confined groundwater in the Subei Basin is probably recharged by deep circulation groundwater and the concealed craters and faults may act as the paths for groundwater discharge.