柳林泉域岩溶水中SO_4^(2-)的来源探讨  

Source of SO_4^(2-) in karst groundwater in the Liulin spring area

作　　者：臧红飞[1] 郑秀清[2] 张永波[2] 杨展 ZANG Hongfei ZHENG Xiuqing ZHANG Yongbo YANG Zhan(School of Water Conservancy, NCWU, Zhengzhou, Henan 450046, China College of Water Resources Science and Engineering, TYUT, Taiyuan, Shanxi 030024, China Shanxi Coal Geological Prospecting Institute of Hydrology, Taiyuan, Shanxi 030006, China)

机构地区：[1]华北水利水电大学水利学院,河南郑州450046 [2]太原理工大学水利科学与工程学院,山西太原030024 [3]山西省煤炭地质水文勘查研究院,山西太原030006

出　　处：《水文地质工程地质》2017年第1期9-15,共7页Hydrogeology & Engineering Geology

基　　金：国家自然科学基金项目(41572239)

摘　　要：SO_4^(2-)浓度偏高是晋西柳林泉域岩溶水的主要特色之一,判断SO_4^(2-)来源对于理解岩溶水的水文地球化学过程具有重要意义。在分析区域地质、水文地质条件及岩溶水中SO_4^(2-)浓度空间分布特征的基础上,利用化学计量学法、同位素质量平衡模型和Rayleigh蒸馏模型,分析了岩溶水中SO_4^(2-)的主要来源,计算了不同来源的SO_4^(2-)所占的比例和滞流区岩溶水中SO_4^(2-)的还原比例。结果显示,石膏的溶解和黄铁矿的氧化是柳林泉域岩溶水中SO_4^(2-)的主要来源,排泄区岩溶水中石膏溶解来源的SO_4^(2-)所占比例介于73%~88%之间,平均为81%;黄铁矿氧化来源的SO_4^(2-)占比12%~27%,平均为19%。滞流区发生了硫酸盐的还原作用,约有9%~15%的SO_4^(2-)被脱硫细菌还原为H2S气体,且越靠近西部边界,还原反应所消耗的SO_4^(2-)比例越高。The karst groundwater in the Liulin spring area is characterized by higher SO42- concentrations. It is important to understand the hydrogeochemical processes of karst groundwater to explore the source of SO42-. Based on analysis of regional geologic and hydrogeologic conditions and spatial distribution of SO42- concentrations in the karst groundwater, the methods for stoichiometry, isotopic mass balance model and Rayleigh distillation model are used to analyze the source of SO42-, and to calculate the ratio of variable sources and the reduction ratio for SO24- in stagnant areas. The results show that SO24- in the karst groundwater primarily stems from dissolution of gypsum and oxidation of pyrite. The percentages of SO^- from dissolution of gypsum range from 73% to 88% with a mean value of 81% in the discharge area, while those from oxidation of pyrite range from 12% to 27% with a mean value of 19%. The reduction of SO42- occurs in the stagnant area, and the reduction ratios are in the ranges 9% - 15% with the higher ratios close to the western boundary.

关 键 词：岩溶水 34S同位素 SO42-来源 柳林泉域 

分 类 号：P641.134[天文地球—地质矿产勘探]