太原盆地浅层高氟水分布特征及形成机制研究

Distribution and Evolutional Mechanism of Shallow High-Fluoride Groundwater in Taiyuan Basin

本文论述了太原盆地浅层高氟水的区域分布规律,即主要分布在太原市以南地区并具有西低东高的分布特征;通过水化学成分统计分析和水化学模拟对高氟水形成机制进行深入研究,取得了一些新的认识:研究区高氟水多为高矿化水,呈现过渡类型水水化学特征,以钠镁、钠钙碱性水居多。氟含量与地下水主要离子成分的配比有一定的对应关系;地下水对含氟矿物的溶解和自身蒸发浓缩是高氟水形成过程中的两种主要水化学作用形式。

Distribution characteristics of the shallow high-fluoride groundwater in Taiyuan basin are discussed in this paper. It is indicated that the shallow high-fluoride groundwater is mainly distributed in the southern area of Taiyuan basin, and F^- concentration is getting higher from west to east. A statistical analysis of the groundwater hydrochemical compositions and hydrochemical model reveals that the high-fluoride water is mainly high-mineral water and has characteristics of the transitional groundwater type, i.e., it is dominantly alkaline groundwater of Na？ Ca or Na？ Mg type. F^- contents are consistent with the proportions of the main ions in the groundwater. During the evolution of the high-fluoride groundwater, the hydrochemical actions of dissolution and evaporation control the variation of F^- contents.