摘要
为研究拉萨河谷地区地下水水化学特征及演化规律,综合运用数理统计、Piper三线图、Gibbs图等进行水化学分析,并运用PHREEQC软件进行水文地球化学反向模拟。结果表明:拉萨河谷地区地下水主要阳离子呈Ca 2+>Mg 2+>Na+>K+的关系,阴离子则存在HCO 3->SO 42->Cl->NO 3-的关系;拉萨河谷地区与堆龙曲河谷地区地下水水化学组分具有一定的差异性,且地下水水化学类型均以HCO 3·SO 4-Ca·Mg为主,水岩作用是地下水水化学组分的主要控制因素。堆龙曲模拟路径发生了斜长石和伊利石的连续溶解,绿泥石的连续沉淀;盐岩先沉淀后溶解,石膏先溶解后沉淀;石英先发生沉淀,后未参与反应;CO 2先逸出,后又溶解。拉萨河路径发生了绿泥石连续沉淀,斜长石开始未参与反应,后发生了溶解;盐岩、石膏、石英和伊利石发生了先溶解后沉淀,CO 2则发生了先溶解后逸出。两条路径都发生了阳离子交换作用,地下水的演化受矿物相的溶解沉淀以及阳离子交换作用的共同影响。
In order to study the hydrochemical characteristics and evolutionary nature of groundwater in the Lhasa valley plain,statistical analysis,Piper trilinear diagram and Gibbs plots were used to make the hydrochemical analysis of the groundwater.The PHREEQC software was utilized to carry out the hydrogeochemical reverse simulation.The results show that the main cations and ions of the groundwater in the Lhasa valley area show the relationship of Ca 2+>Mg 2+>Na+>K+and HCO 3->SO 42->Cl->NO 3-,respectively.Although the hydrochemical composition of groundwater in the Lhasa valley area and Duilongqu valley area has some differences,the main hydrochemical types of groundwater are both HCO 3·SO 4-Ca·Mg and water-rock interaction is the major controlling factor of groundwater chemical composition.In the Duilongqu river path simulation,plagioclase and illite dissolve continuously and chlorite precipitates continuously;halite precipitates initially and dissolves afterwards;gypsum dissolves initially and precipitates afterwards;quartz precipitates initially and then does not participate in the reaction;CO 2 escapes first and then dissolves.In the Lhasa river path simulation,chlorite precipitates continuously;plagioclase does not take part in the reaction and dissolves afterwards;halite,gypsum,quartz and illite dissolve initially and precipitate afterwards;and CO 2 dissolves initially and then escapes.Cation exchange occurs on both paths,and the evolution of groundwater is influenced by the dissolution and precipitation of mineral phases and cation exchange.
作者
高宗军
刘久潭
李颖智
LI Ning
王敏
王姝
王贞岩
刘曼茜
GAO Zongjun;LIU Jiutan;LI Yingzhi;LI Ning;WANG Min;WANG Shu;WANG Zhenyan;LIU Manxi(College of Earth Science and Engineering,Shandong University of Science and Technology,Qingdao,Shandong 266590,China;Center for Hydrogeology and Environmental Geology,China Geological Survey,Baoding,Hebei 071051,China;Department of Earth Sciences,Federal Institute of Technology Zurich,Zurich 8093,Switzerland)
出处
《山东科技大学学报（自然科学版）》
CAS
北大核心
2020年第1期1-10,共10页
Journal of Shandong University of Science and Technology(Natural Science)
基金
中国地质调查局地质调查项目(12120114059601,DD20160298)
关键词
水化学
水文地球化学模拟
水岩作用
地下水
拉萨河谷地区
hydrochemical
hydrogeochemical simulation
water rock interaction
groundwater
Lhasa valley area
作者简介
高宗军(1964—),男,山东泰安人,教授,博士生导师,主要从事水文地质方面的研究.E-mail:gaozongjun@126.com;通信作者:李颖智(1982—),男,湖北通山人,高级工程师,从事水文地质环境地质调查研究,E-mail:liyingzhi198258@163.com。
