采用离子比例系数法分析了西藏某矿区地下潜水在2个不同水流方向上的水化学成分特征,并结合矿区含水层岩性,确定水文地球化学模拟过程中应加入的矿物组分;采用PHREEQC软件对矿区地下水2种不同径流方向上发生的水文地球化学反应进行识别,模拟结果表明:沿地下水路径1,从荣那沟上游至中游,发生了石膏、钠长石、钾长石的沉淀,钙长石的溶解以及阳离子交替吸附作用;沿路径2,从矿区东北侧至荣那沟,发生了石膏、岩盐、白云石、钠长石的沉淀,钾长石、钙长石、黄铁矿、赤铁矿的溶解,以及阳离子交替吸附反应.本次对矿区地下潜水水化学演化机制的研究,对分析影响西藏地区地下水水文地球化学演化规律具有重大意义.
The ion proportional coefficient method was used to analyze the hydrochemical composition characteristics of the phreatic water in the two different directions of the flow in a mining area in Ti-bet.Combined with the lithology of the aquifer in the mine area,it was determined that mineral com-ponents should be added to the hydrogeochemical simulation process.PHREEQC software was used to identify hydrogeochemical reactions in two different runoff directions of groundwater in mining areas.Simulation settlement showed that along the groundwater path1,from the upstream to the middle reaches of Rongna Trench,the precipitation of gypsum,sodium feldspar and potassium feldspar,the dissolution of calcium feldspar and alternating adsorption of cation sorption had occurred.Along the path2,from the northeast side of the mining area to Rongna Trench,the precipitation of gypsum,rock salt,dolomite and sodium feldspar,the dissolution of potassium feldspar,calcium feldspar,py-rite and hematite,and cation alternating adsorption reactions occurred.This study of the chemical e-volution mechanism of phreatic water in mining areas is of great significance for the analysis of the laws affecting the hydrogeochemical evolution of phreatic water in Tibet.