安徽泾县榔桥镇马渡村饮用天然矿泉水成因及水化学特征研究

Study on the origin and the water chemical characteristics of drinking natural mineral water in Madu village,Langqiao town,Jing county,Anhui province

矿泉水作为一种宝贵的矿产资源,系统分析其成因及水化学特征是合理开发利用的前提和基础。本研究区选取安徽泾县榔桥镇马渡村饮用天然矿泉水作为研究对象,系统分析了其赋存的水文地质条件及水化学和同位素指标,确定了该矿泉水的补给源、年龄及形成机制,并进行了定名。结果表明,马渡村矿泉水主要赋存于榔桥岩体花岗闪长岩构造裂隙中,以北西走向张性构造破碎带为主要含水层。矿泉水补给源主要为大气降水入渗循环补给,矿泉水的年龄主要为1960年以前补给的地下水与少量现代水的混合物。形成机制为大气降水入渗后经断裂、裂隙深循环,运移过程中发生水岩相互作用,使地下水中有用组分含量升高,在断裂带内形成了富含偏硅酸的饮用天然矿泉水。矿泉水经丰水期、平水期和枯水期的水质检验,其主要常量成分和界限指标基本稳定,可定名为重碳酸钙钠型含锶的偏硅酸饮用天然矿泉水。

Mineral water is a kind of precious mineral resource,and systematic analysis of its origin and water chemical characteristics is the premise and basis of rational development and utilization.In this study,the natural mineral water in Madu village,Langqiao town,Jing county,Anhui province,was selected as the research object,the hydro-geological conditions and water chemistryand isotope indicators of the mineral water were systematically analyzed,the mineral water's source,age,and formation mechanisms were determined.At last,we named this mineral water.The results show that:The mineral water in Madu village mainly occurs in the structural fissures of the granite in the Langqiao rock mass,and the primary aquifer is the northwest-trending tensor structural fracture zone.The source of mineral water recharge is mainly atmospheric precipitation infiltration cycle recharge,and the age of mineral water is mainly a mixture of groundwater recharged before 1960 and a small amount of modern water.The formation mechanism is that after atmospheric precipitation infiltrates,it will circulate deeply through faults and fissures,and water-rock interaction will occur during the migration process,increasing the content of valuable components in groundwater,and finally leading to natural mineral springs rich in metasilicate in the fault zone.According to the water quality results of mineral water in the wet,normal,and dry seasons,the main chemical components and limitation indicators are stable.It can be named as calcium bicarbonate sodium type strontium-containing metasilicate drinking natural mineral water.