山东省平度北部富锶地下水水化学特征及形成机制

Hydrochemical characteristics and formation mechanism of strontium-rich groundwater in northern Pingdu,Shandong Province

地下水是平度地区重要供水源,本次调查中发现富锶地下水,研究其水化学特征和成因机理具有重要意义.2020年9月采集了地下水和地表水样品,结合水文地质条件,运用描述性统计分析、Piper三线图、Gibbs图、离子比值、矿物饱和指数等方法,揭示了平度北部地区富锶地下水的成因机制.结果表明,平度北部地区富锶地下水分布广泛,锶含量为0.08~2.92 mg·L^(-1).平均含量为0.68 mg·L^(-1),水化学特征受溶滤作用、蒸发浓缩作用的影响,岩石风化溶解是水化学特征的主要控制因素.地下水径流强化了Sr^(2+)的富集.区内以硅酸盐岩矿物和碳酸盐岩矿物溶解为主.Na^(+)、K^(+)、Cl^(-)、Sr^(2+)主要来源于硅酸盐岩的溶解,Ca^(2+)、Mg^(2+)和SO_(4)^(2-)主要来源于碳酸盐岩的溶解.人类活动对研究区水化学特征有较大影响.

Groundwater is an important source for water supply in the Pingdu area.In this survey,strontium-rich groundwater was found,and it is of great significance to study its hydrochemical characteristics and formation.Groundwater and surface water samples were collected in September 2020.Combined with hydrogeological conditions,descriptive statistical analysis,Piper trilinear diagram,Gibbs diagram,ion ratio,mineral saturation index and other methods were used to reveal the formation mechanism of strontium-rich groundwater in the northern part of Pingdu.The results indicated that strontium-rich groundwater is widely distributed in the northern part of Pingdu,and the strontium concentration is between 0.08 and 2.92 mg·L^(-1),the average concentration is 0.68 mg·L^(-1).The hydrochemical characteristics are affected by leaching and evaporation.Rock weathering and dissolution are the main controlling factors of hydrochemical characteristics.Groundwater runoff enhanced the enrichment of Na^(+),K+,Cl^(-)and Sr^(2+)are mainly derived from the dissolution of silicate rocks,and Ca^(2+),Mg^(2+)and SO_(4)^(2-)are mainly derived from the dissolution of carbonate rocks.Human activities have great influence on hydrochemical characteristics in the study area.