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在分析下庄铀矿田成矿地质背景的基础上，根据包体水氢、氧同位素组成和水－岩相互作用原理对该矿田成矿热液的水源进行了详细探讨。其结果表明，下庄铀成矿热液的氢、氧同位素组成δ１８Ｏ＝＋６．９０‰～－９．８０‰（ＳＭＯＷ）、δＤ＝－３０‰～－８５‰（ＳＭＯＷ）位于已发生氧漂移的大气降水同位素组成范围。水－岩同位素交换后，岩石的δ１８Ｏ值明显降低，显示出与岩石相互作用的古地下水具有相当低的δ１８Ｏ值。不同水－岩比值条件下同位素交换结果证明下庄成矿古水热系统具有比较充足的水源，大气降水与岩石交换后热液的δ１８Ｏ计算（－８．２６‰～＋１．５３‰）与成矿期热液的δ１８Ｏ值（－６．５４‰～＋１．４３‰）相吻合。证据表明下庄铀矿田成矿热液的水源主要来自大气降水。
Based on the analysis of the metallogenic geological background of Xiazhuang uranium orefield, the water sources of ore-forming hydrothermal fluids in this ore field are discussed in detail according to the hydrogen and oxygen isotopic compositions and water-rock interaction. The results show that the δ18O = + 6.90 ‰ ~ -9.80 ‰ (SMOW) and the δD = -30 ‰ ~ -85 ‰ (SMOW) of the hydrothermal fluids of Xiazhuang uranium ore are located in the oxygen drift Atmospheric precipitation isotope composition range. After the water-rock isotope exchange, the δ18O value of the rock decreased significantly, indicating that the paleo-groundwater that interacted with the rock had a rather low δ18O value. The results of isotope exchange under different water - rock ratios prove that the paleo - hydrothermal system in Xiazhuang ore deposit has abundant water sources. The δ18O (-8.26 ‰ ~ + 1.53 ‰) The hydrothermal δ18O values (-6.54 ‰ ~ + 1.43 ‰) are consistent. Evidence shows that the source of mineralization hydrothermal fluids in Xiazhuang uranium orefield is mainly derived from atmospheric precipitation.