中文摘要：

地下水中硫酸盐的34S和18O在探寻地下水的水质演化规律、赋存环境特征方面具有重要的研究意义,笔者选取保定—河间—沧州—黄骅剖面采集深层地下水水样,分析测试了其主要阴阳离子含量、δ18O、δD、14C及δ34SSO42-和δ18OSO42-各项指标,在此基础上首次探讨了河北平原地下水中硫酸盐的硫、氧同位素分布特征与演化机理。研究发现研究区地下水硫酸盐的δ34SSO42-值沿地下水流向增大,δ18OSO42-值则在一个较小的范围内波动,最终接近一个常数值,二者间呈现较好的负相关关系;δ34SSO42-值随地下水14C年龄的增加而增加,δ18OSO42-则随地下水14C年龄的增加而趋于稳定;34SSO42-值与r（SO42-）/r（Cl-）的值呈负相关关系,δ18OSO42-值与r（SO42-）/r（Cl-）的值则呈正相关关系。在研究区地下水中硫酸盐的34S和18O同位素的分布演变特征主要由SO42-和水之间的同位素交换反应、微生物硫酸盐的还原作用、硫化氢的再氧化作用所影响,其中微生物硫酸盐的还原作用的结果使地下水中的硫酸盐富集34S,SO42-和水之间的同位素交换反应是影响地下水的δ18OSO42-值的主导因素,使地下水的δ18OSO42-取决于地下水的氧同位素组成。

英文摘要：

Sulfur and oxygen isotopic compositions play a significant role in studying groundwater quality evolution and its environment characteristics. A section along Baoding-Hejian-Cangzhou-Huangye was selected to collect deep groundwater samples, and the samples were then analyzed for such items as main ions, 8TM O, 8D, 24 CO, δ^34Ssulfate-residual and δ^18Osulfate-residual. On this basis, this paper has discussed the distribution characteristics of ^34S and ^18O residual sulfate in deep groundwater and their potential evolution mechanism in Quaternary sediments of the Hebei Plain. It is pointed out that δ^34Ssulfate-residualvalues rise in the groundwater flow direction and δ^18Osulfate-residual values vary in a narrow range and finally tend to attain a constant value, that the two kinds of values show an obvious negative correlation, that δ^34Ssulfate-residualvalues increase together with the older ^14C age of groundwater and δ^18Osulfate-residual values tend to attain a constant value with the increasing ^14C age of groundwater, and that δ34Ssulfate-residual values have also a negative correlation with r（ SO42- ）/r（ C1 - ） mole ratios of groundwater while a positive correlation exists between δ^18O sulfate-residual values and SO42-/Cl- mole ratios of ground- water. The factors controlling ^34S and ^18O evolution of sulfate residuals in groundwater might be the isotope exchange reaction between SO4^2- and groundwater, the sulfate reduced by bacteria and the re-oxidation of H2S. The sulfate residuals in groundwater are likely to be rich in ^34S as the sulfate is reduced by bacteria. The oxygen isotope exchange reaction between SO4^2- and groundwater is the controlling factor of δ^18Osulfate.residual values, which causes the dependency of δ^18O sulfateresidual values on oxygen isotopic composition of groundwater.