商丹盆地地下水水化学特征及成因机制  

Hydrochemical Characteristics and Formation Mechanism of Groundwater in Shangdan Basin

作　　者：赵浩 李晓明 赵立磊 乔龙潭 王郅睿 赵倩卓 李新斌 ZHAO Hao;LI Xiaoming;ZHAO Lilei;QIAO Longtan;WANG Zhirui;ZHAO Qianzhuo;LI Xinbin(Xi’an Center of Mineral Resources Survey,China Geological Survey,Xi’an 710100,China;Qinling-Loess Plateau Transition Zone Observation and Research Station for Coupling of Soil and Water Elements and Conservation of Biological Resources,Tongguan 714300,China)

机构地区：[1]中国地质调查局西安矿产资源调查中心,陕西西安710100 [2]秦岭-黄土高原过渡带水土要素耦合与生物资源保育野外观测研究站,陕西潼关714300

出　　处：《人民黄河》2024年第12期98-104,共7页Yellow River

基　　金：中国地质调查局地质调查项目(DD20230481,DD20242461)。

摘　　要：为探究商丹盆地地下水水化学特征及其形成作用,支撑商洛市商丹循环工业经济园区建设,选择2023年商丹盆地地下水资源调查获得的24组地下水水化学数据,综合运用数理统计、Piper三线图、Gibbs图、离子比分析和主成分分析等方法进行水文地球化学分析,结果表明:研究区地下水为淡水,整体呈中性,总硬度为200~698 mg/L,平均值为427.79 mg/L;溶解性总固体含量为243~960 mg/L,平均值为545.29 mg/L;地下水水化学类型以HCO_(3)-Ca型为主,水化学成分受碳酸盐岩和硅酸盐岩风化溶解作用共同控制;地下水中Na^(+)和K^(+)主要受盐岩溶解作用控制,Ca^(2+)和Mg^(2+)主要受碳酸盐岩和硫酸盐岩风化溶解作用控制;地下水水化学特征受水岩相互作用、阳离子交换作用和人类活动的共同影响,地下水在运移过程中以正向阳离子交换为主,矿业开采、农业生产和生活污水排放等人类活动对地下水化学成分影响较大。In order to explore the hydrochemical characteristics and formation mechanism of groundwater in Shangdan basin and support the construction of Shangluo Shangdan Circular Industrial Economic Zone,the paper selected 24 groups of Groundwater hydrochemical data ob⁃tained from the groundwater resources survey in Shangdan basin in 2023 for hydrogeochemical analysis by using mathematical statistics,Piper trilinear diagram,Gibbs model diagram,ion ratio analysis and principal component analysis.The results show that a)the groundwater in the study area is fresh water,which is neutral as a whole.The total hardness varies from 200 to 698 mg/L,with an average of 427.79 mg/L;b)the total dissolved solids range from 243 to 960 mg/L,with an average of 545.29 mg/L;c)the hydrochemical type of groundwater is mainly HCO_(3)-Ca type,and the hydrochemical composition is jointly controlled by the weathering and dissolution of carbonate rocks and silicate rocks;d)Na^(+)and K^(+)in groundwater are mainly controlled by the dissolution of salt rock,while Ca^(2+)and Mg^(2+)are mainly controlled by the weathering dissolution of carbonate rock and sulfate minerals and;e)the hydrochemical characteristics of groundwater are affected by water rock interaction,cation exchange and human activities,positive cation exchange is dominant in the process of groundwater migration.Human activities such as mining,agricultural production and domestic sewage discharge in the area have a great impact on the chemical composition of groundwater.

关 键 词：地下水 水化学特征 水岩相互作用 主成分分析 商丹盆地 

分 类 号：P641[天文地球—地质矿产勘探]