摘要
以陕西省汉中市西南部岩溶水为研究对象,运用水化学和氢氧同位素方法,分析了岩溶水水化学特征及其形成机制,以为岩溶水资源的合理开发利用和探究岩溶地貌发育规律提供理论依据。研究结果表明:研究区岩溶水属低矿化度、弱碱性水,水化学类型以HCO_(3)-Ca型水为主;大气降水是区域岩溶水的主要补给来源,其在转化为岩溶水的过程中受到蒸发作用的影响;岩溶水水化学组分受控于岩石风化作用,以方解石、白云石为主的碳酸盐岩类矿物和以石膏、硬石膏为主的少量硫酸岩盐类矿物是区域岩溶水水化学组分的主要来源,离子比例系数和矿物饱和指数证实方解石是水中主要溶解的矿物,白云石次之;岩溶水与围岩之间未发生显著的δ18 O交换,可能与地下水径流强烈、滞留时间短有关。
The methods of hydrogen and oxygen isotopes and hydrochemistry were used to identify the chemical characteristics and influencing factors of karst water samples collected from southwest of Hanzhong City,Shaanxi Province,which provided a theoretical basis for the development and utilization of karst water resources and exploring the generation mechanism of karst landform.The results indicated that karst water samples were mainly HCO_(3)-Ca type with weakly alkaline and low salinity.Karst water was mainly recharged by atmospheric precipitation and the supply process was affected by evaporation.The solute composition of the karst water controlled by water-rock interaction was mainly from the dissolution of carbonate minerals such as calcite,dolomite and partly from the dissolution of sulphate minerals such as gypsum,anhydrite.The methods of ion proportional coefficient and mineral saturation index also confirmed that calcite was the principal dissolved mineral in water,followed by dolomite.The oxygen isotope exchange between water and rock was not significant,which would be resulted by short retention time and fast flow rate of karst water.
作者
李修成
张俊良
李益朝
王鹏
唐力
LI Xiucheng;ZHANG Junliang;LI Yizhao;WANG Peng;TANG Li(Shaanxi Mineral Resources and Geological Survey,Xi an 710086,China;International Research Base of Hanzhong Karst Cave Groups,Hanzhong 723100,China)
出处
《人民长江》
北大核心
2021年第12期54-58,共5页
Yangtze River
基金
陕西省公益性地质调查项目(201902,201916)。
关键词
岩溶水
水化学特征
氢氧同位素
成因机制
汉中市
karst water
hydrochemistry characteristic
hydrogen and oxygen isotopes
formation mechanism
Hanzhong City
