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通过对福建大田琴山矿区水文地质调查,并对研究区所取的8件水样水质分析结果研究发现,该地区的地下水类型主要以HCO3-Ca为主。通过Gibbs模型分析,其成因是岩石风化与大气降水共同作用的结果,是大气降水渗入岩层并经过溶滤作用形成现今的地下水特征类型。结合研究区的地质地貌特征,发现研究区水化学成分在垂直方向上存在明显的分带性,由地表到地下,随着深度增加,研究区水化学类型由HCO3-Ca向HCO3.SO4-Ca、SO4.HCO3-Ca过渡,在深部形成SO4-Ca型水,主要受研究区矿物岩石组合类型的控制,这为研究地下水水文地球化学分带性成因提供了很好的例子。
Through the hydrogeological survey of Dashanqin mining area in Fujian Province and the analysis of 8 water samples taken from the study area, it is found that the groundwater types in this area are mainly HCO3-Ca. Gibbs model analysis shows that the cause is the result of rock weathering combined with atmospheric precipitation. Atmospheric precipitation infiltrates the rock formation and forms the present groundwater feature type through leaching. Combined with the geology and geomorphology of the study area, it is found that there is obvious zonation in the vertical direction of the water chemical composition in the study area, from the surface to the ground. As the depth increases, the hydrochemical type in the study area changes from HCO3-Ca to HCO3.SO4-Ca , SO4.HCO3-Ca transition, and the formation of SO4-Ca type water in the deep is mainly controlled by the type of mineral rock assemblage in the study area, which provides a good example for studying zonal geochemistry of groundwater.