毕节市北部岩溶地下水水文地球化学特征  

Hydrogeochemical characteristics of karst groundwater in the northern part of the city of Bijie

作　　者：袁建飞[1] 邓国仕[1] 徐芬[2] 唐业旗[1] 李鹏岳[1] 

机构地区：[1]中国地质调查局成都地质调查中心,四川成都610081 [2]中国地质大学(武汉)环境学院,湖北武汉430074

出　　处：《水文地质工程地质》2016年第1期12-21,共10页Hydrogeology & Engineering Geology

基　　金：中国地质调查局项目(12120113052500;12120114030301)

摘　　要：我国西南地区赋存丰富的岩溶水资源,这些水资源是当地居民生产生活用水的主要来源。以贵州省毕节市北部海子街镇及其邻区岩溶地下水为研究对象,通过分析常规水化学组分和氢氧同位素,确定研究区岩溶水的补给特征,识别岩溶水主要组分的物质来源和判断发生的水岩相互作用过程。结果显示:研究区地下水水化学类型主要为HCO_3—Ca型、HCO_3·SO_4—Ca型和HCO_3—Ca·Mg型。阴离子以HCO_3^-和SO_4^(2-)为主,而阳离子以Ca^(2+)和Mg^(2+)为主,部分水样N_3O^-和SO2-4含量偏高。氢氧同位素分析显示,研究区地下水以当地大气降水补给为主。补给入渗的大气降水与碳酸盐岩、石膏和盐岩矿物发生反应致使岩溶水化学组分以HCO-3、SO_4^(2-)、Ca^(2+)和Mg^(2+)为主,而生活污水、农业药物和采矿活动导致地下水中NO_3^-和SO_4^(2-)含量增加。相应成果可为当地地下水资源的开发和管理提供科学依据。There are abundant karst groundwater resources in the southwestern China,which is the main water sources for local people. Chemical components and hydrogen and oxygen isotopic data of the groundwater in the Haizijie country and its adjacent regions of the city of Bijie are combined to determine the recharge source of the karst groundwater,identify the origin of major components in the groundwater,and distinguish the water-rock interaction processes. Chemical components analyses show that most of the groundwater is of HCO3-Ca,HCO3·SO4-Ca and HCO3-Ca·Mg type. The hydrogen and oxygen isotopic data demonstrates that the groundwater in the study area receives recharge from modern precipitation. The major chemical components of most groundwater are Ca^2＋,Mg^2＋,HCO3^- and SO4^2-,which are the results of dissolution and precipitation of dolomite,calcite,gypsum and halite. Some water samples have high concentrations of SO4^2-and NO3^-,which can be interpreted by the influence of sewage,agriculture and mining activities. The results are instructive for improving the management and utilization of groundwater resources for local government.

关 键 词：岩溶地下水 水化学特征 氢氧同位素 贵州省毕节市 

分 类 号：P641.12[天文地球—地质矿产勘探]