云南昭通喀斯特区天然水水化学性质及地质成因

为研究云南省昭通市昭通喀斯特区天然水水化学性质及其地质成因,采集9组河水样和27组裂隙水样,运用Piper三线图、阴阳离子比例法及饱和指数法,分析了昭通喀斯特区河水及裂隙水的水化学性质及主要地质因素。结果表明昭通河水与裂隙水中优势阴阳离子分别为HCO₃^-(67.3%和70.0%)与Ca²⁺(60.0%和72.1%);昭通81.6%天然水TH主要在75.0～300.0 mg/L之间。昭通天然水中含F^-量(均值0.1 mg/L)远低于中国饮用水卫生标准值(1.0 mg/L)。以碳酸盐岩为主的含水层中发育的裂隙水化学类型主要为Ca-HCO₃和Ca·Mg-HCO₃。含水层岩性控制着昭通裂隙水化学性质。昭通氟中毒区可在碳酸盐岩且岩性较为单一的含水层中找到优质水源。

Hydro-geochemistry and Geological Genesis of Natural Water in Karst Region in Zhaotong City,Yunnan Province

Nine river water samples and 27 fissure water samples were collected to study the ion chemistry and geological genesis of natural water in Karst Region in Zhaotong City, Yunnan Province by means of statistical approaches such as Piper trilinear chart, Ion ratio and saturation index method. Results showed that the predominant anion and cation was HCO₃^-(relative concentration: 67.3% and 70.0%) and Ca²⁺ (relative concentration: 60.0% and 72.1%), respectively. Total hardness (TH) in 81.7% of natural water from the fluorosis area in Zhaotong was between 75 and 300 mg/L. The F^- concentration (mean value 0.1 mg/L) of natural water from the fluorosis area in Zhaotong was well below the standards for drinking water quality (1.0 mg/L). The hydro-chemistry type of fissure water, of which aquifer rock was carbonatite, was Ca-HCO₃ and Ca·Mg-HCO₃. It is concluded that aquifer lithology controlled the hydro-chemistry of fissure water. High quality water could be found in aquifer rock which is carbonatite and unitary lithology in the fluorosis area of Zhaotong City.