摘要
赣南地区是典型的缺水地区,查清该地区浅层地下水水化学特征及演化规律,对保障区域饮用水安全和促进经济发展具有重要意义。现以银坑幅为例,综合采用数理统计、相关分析、Gibbs图解及离子比例系数等方法对研究区97个浅层地下水样品进行分析,结果表明,研究区浅层地下水中阳离子以Ca^(2+)为主,阴离子以HCO_(3)^(-)为主,并且两者在阴阳离子中占绝对优势;浅层地下水水化学类型多样,以HCO_(3)^(-)Ca、HCO_(3)^(-)Ca·Na和HCO_(3)^(-)Na·Ca型水为主;研究区浅层地下水水化学过程以岩石风化溶滤作用为主导;Na^(+)、K^(+)主要来源于钠长石、钾长石等硅酸盐的风化溶解,Ca^(2+)、Mg^(2+)主要来源于碳酸岩风化溶解,其中方解石风化溶解作用较白云岩强;浅层地下水水化学特征受阳离子交换作用和人类活动影响不强烈。
Southern Jiangxi Province is always deemed as the areas with typical shortage of groundwater,investigation of the hydrochemical characteristics and evolution law of shallow groundwater in this area is of great significance to ensure drinking water safety and promote economic development.Now taking Yinkeng sheet survey area as an example,the shallow groundwater samples from 97 locations were analyzed through such methods as mathematical statistics,correlation analysis,Gibbs diagrams and ion scale coefficients.The result shows that the cations and anions in the shallow groundwater were mainly Ca^(2+) and HCO_(3)^(-),with absolute superiority of numbers in the anion-cations;the hydrochemical types of shallow groundwater were various with the majority of HCO_(3)^(-)Ca,HCO_(3)^(-)Ca·Na and HCO_(3)^(-)Na·Ca;The hydrochemical composition of shallow groundwater was mainly influnced by rock weathering and dissolution;Na^(+) and K^(+) in shallow groundwater mainly came from the dissolution of silicate(such as albite and potassium feldspar),Ca^(2+) and Mg^(2+) were mainly derived from weathering dissolution of carbonate rock,and the weathering and dissolution of calcite were stronger than that of dolomite;The hydrochemical characteristics of shallow groundwater are not strongly affected by cation exchange and human activities.
作者
赵幸悦子
肖攀
黎义勇
邵长生
ZHAO Xing-Yue-Zi;XIAO Pan;LI Yi-Yong;SHAO Chang-Sheng(Wuhan Center of China Geological Survey,Wuhan 430205,Hubei,China)
出处
《华南地质》
CAS
2021年第4期418-426,共9页
South China Geology
基金
中地质调查局地质调查项目“赣江流域水文地质调查(编号DD20190329)”。
关键词
浅层地下水
水化学特征
影响因素
赣南地区
shallow groundwater
hydro-chemical characteristics
influence factor
Southern Jiangxi Province
