鲁西南黄河下游地下水氟富集规律及其影响因素  

Fluorine enrichment pattern of groundwater in the lower reaches of the Yellow River in southwestern Shandong Province and influencing factors

作　　者：孟甲 郑慧铭 宋帅良[1] 张茜 张丰[1,2] MENG Jia;ZHENG Huiming;SONG Shuailiang;ZHANG Xi;ZHANG Feng(Shandong Provincial Lunan Geology and Exploration Institute(Shandong Provincial Bureau of Geology and Mineral Resources No.2 Geological Brigade),Jining 272100,Shandong,China;Key Laboratory of Karst Geology,Shandong Provincial Bureau of Geology and Mineral Resources,Jining 272100,Shandong,China)

机构地区：[1]山东省鲁南地质工程勘察院(山东省地质矿产勘查开发局第二地质大队),山东济宁272100 [2]山东省地矿局岩溶地质重点实验室,山东济宁272100

出　　处：《地质通报》2024年第9期1663-1672,共10页Geological Bulletin of China

基　　金：山东省自然资源厅省级地质勘查项目《菏泽黄河滩区生态地质调查》(编号:鲁勘字[2020]51号)。

摘　　要：鲁西南平原位于黄河下游,现阶段对该区地下水水化学成因及其对地下水中F元素富集影响机理的研究较少。该研究以鲁西南平原沿黄河地带地下水为主要研究对象,采集浅层地下水样品36件,深层地下水样品16件,黄河水样品2件进行全分析测试;通过统计、相关性分析、水化学模拟等方法手段,计算氯碱指数(CAI),绘制Durov图、Gibbs图、Ca^(2+)/Na^(+)–Mg^(2+)/Na^(+)图、log_(10)(Ca^(2+))_(activity)–log_(10)(F^(-))_(activity)图等图件,分析了研究区地下水水化学成因及其富氟机理。结果显示,鲁西南沿黄区浅层及深层地下水化学类型均以HCO_(3)-Na为主,整体偏碱性,地下水氟含量分别为1.59 mg/L、2.35 mg/L,深层水氟含量水平变化程度低于浅层;区内浅层地下水氟与Ca^(2+)含量呈显著负相关,与pH值呈显著正相关,深层地下水中氟与Na^(+)、TDS值呈显著正相关。鲁西南沿黄区地下水氟含量主要来源于萤石(Ca F_(2))的溶解,受水岩作用和阳离子交换作用共同控制下的Ca^(2+)含量制约。此研究揭示了黄河下游主要地下水含水层中氟富集规律和影响因素。The southwestern plain of Shandong Province is located in the lower reaches of the Yellow River,and there are few studies on the chemical genesis of groundwater in this region and the mechanism of its influence on fluorine enrichment in groundwater at this stage.In this study,36 shallow groundwater samples,16 deep groundwater samples and 2 Yellow River water samples were collected for comprehensive analysis and testing.By means of statistical,correlation analysis and water chemistry simulation,the chlor-alkali index (CAI),Durov diagram,Gibbs diagram,Ca~(2+)/Na~+-Mg~(2+)/Na~+diagram,log_(10)(Ca~(2+))_(activity)-log_(10)(F~-) _(activity) diagram were constructed,and then the causes of groundwater chemistry and its fluoride enrichment mechanism in the study area were analyzed.The results showed that the chemical types of both shallow and deep groundwater in the study area were mainly HCO_3-Na,indicating the overall alkaline,the fluorine content of groundwater was 1.59 mg/L and 2.35 mg/L,respectively,and the level of fluorine content in deep water varied less than that in shallow water.The fluorine content in shallow groundwater in the area was significantly negatively correlated with Ca~(2+)content and positively correlated with pH value.The fluorine content in deep groundwater was significantly and positively correlated with Na~+and TDS values.The chemical composition of groundwater in the study area is mainly controlled by water-rock action and cation exchange,and the fluorine content of groundwater mainly comes from the dissolution of fluorite (CaF_2),and iscontrolled by Ca~(2+)content.This study revealed the fluorine enrichment laws and influencing factors in the main groundwater aquifers in the lower reaches of the Yellow River.

关 键 词：黄河下游 鲁西南 冲积平原 高氟地下水 水化学 阳离子交换 

分 类 号：P641.12[天文地球—地质矿产勘探]