水文地质单元交界区潜水水化学特征及演化分析:以泰州市区为例  

Chemical Characteristics of Phreatic Water in the Boundary Zone of Multiple Hydrogeological Units:A Case on Study of Urban Area,Taizhou City

作　　者：李朗[1] 黄晓燕[1] 何伟[1] 秦甜甜 LI Lang;HUANG Xiao-yan;HE Wei;QIN Tian-tian(Geological Survey of Jiangsu Province,Nanjing 210018,China)

机构地区：[1]江苏省地质调查研究院,南京210018

出　　处：《科学技术与工程》2024年第6期2265-2275,共11页Science Technology and Engineering

基　　金：江苏省地勘基金(苏财建[2016]140号);全国区域地质调查试点项目(12120114042901)。

摘　　要：泰州市区位于长江北部三角洲平原水文地质亚区与里下河低洼湖荡平原水文地质亚区的交界带。为对比研究两亚区潜水层的水化学特征,通过电荷平衡、统计分析、Piper图、Gibbs图、离子比例、相关分析等方法,分析了水化学主要指标空间分布、水化学类型、相关联系、离子来源,探讨了水化学演化的成因及两亚区的差异来源。结果表明:区内潜水阳离子含量Ca^(2+)>Na^(+)>Mg^(2+)>K^(+),阴离子含量HCO_(3)^(-)>SO_(4)^(2-)>Cl^(-),北部多为微咸水,中南部以淡水为主,主要指标含量从北到南逐渐降低,水化学特征以硅酸盐风化类水岩作用为主,全新世海侵的遗留成分仅对北部潜水有少量影响,人类活动影响均以农业灌溉为主,阳离子交换作用以正向阳离子交换的方式发生。亚区间水化学成分和水化学类型差异明显,两亚区水化学特征差异的主要成因是全新世海退后迥异的沉积环境以及地貌的影响。The Taizhou urban area is located at the junction of the hydrogeological subzones of the northern Yangtze River Delta Plain and the Lixiahe Low-lying Lake-dotted Plain.To compare and study the hydrochemical characteristics of the phreatic layer in the two sub regions,the spatial distribution,hydrochemical types,correlation relationships,and ion sources of the main hydrochemical indicators were analyzed through methods such as charge balance,statistical analysis,Piper plot,Gibbs plot,ion ratio,and correlation analysis.The causes of hydrochemical evolution and the sources of differences between the two sub regions were explored.The results show that the content of cations in the phreatic water in the area is Ca^(2+)>Na^(+)>Mg^(2+)>K^(+),and the content of anions is HCO^(-)_(3)>SO^(2+)_(4)>Cl^(-).The northern part is mostly brackish water,and the central and southern parts are mainly fresh water.The content of main indicators gradually decreases from north to south.The hydrochemical characteristics are mainly silicate weathering water rock interaction.The remaining components of the Holocene transgression have only a small impact on the northern phreatic water.The impact of human activities is mainly agricultural irrigation,Cation Exchange interaction occurs in the form of positive cation exchange.There are obvious differences in hydrochemical composition and hydrochemical types between the two sub regions.The main causes of the differences in hydrochemical characteristics between the two sub regions are the different sedimentary environments and geomorphological effects after the Holocene sea retreat.

关 键 词：潜水 水化学特征 沉积环境 硅酸盐风化 交界带 

分 类 号：P641.3[天文地球—地质矿产勘探] X523[天文地球—地质学]