寿宁大韩横底矿区饮用天然矿泉水的特征与成因初探

Preliminary study on the characteristics and causes of drinking natural mineral water in Dahan Hengdi mining area in Shouning County

野外实地勘查结合水化学分析发现,寿宁县大韩村横底矿区的饮用天然矿泉水为偏硅酸型饮用天然矿泉水,水质优越.经过1 a的稳定水文观测,得出第一断面平均日涌水量为1001~1331 m3·d-1.大韩村横底矿区地下水是因为在漫长的地下深循环中,与围岩流纹质晶屑凝灰熔岩(火山岩)中的长石等矿物接触,发生溶滤、阴阳离子交替吸附等一系列物理化学作用,使围岩中长石等矿物与二氧化碳和水发生化学反应形成硅酸,分解形成偏硅酸进入地下水中,并富集到一定的浓度形成偏硅酸矿泉水.偏硅酸矿泉水沿着构造裂隙运移上升,在隧洞中呈泉点的形式出露,最终形成偏硅酸型矿泉水.

Field exploration,combined with water chemical analysis,found that the natural drinking mineral water in the Hengdi mining area of Dahan Village in Shouning County is a metasilicic acid type of drinking natural mineral water,and the water quality is superior.It is found that the average daily water inflow at the first section was 1001-1331 m3·d-1 by one year of stable hydrological observations.In the long deep under⁃ground circulation,the groundwater in the Hengdi mining area of Dahan comes into contact with minerals such as feldspar in the surrounding rock rhyolite crystalline tuff lava(volcanic rock),resulting in leaching and alter⁃nating anion and cation adsorption.A series of physical and chemical actions make the feldspar and other min⁃erals in the surrounding rock chemically react with carbon dioxide and water to form silicic acid,and decom⁃pose to form metasilicic acid,which enters the groundwater and enriches to a certain concentration to form metasilicic acid mineral water.The metasilicate mineral water migrates and rises along the structural fissures,and emerges in the form of springs in the tunnel,eventually forming metasilicate mineral water.