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为研究张掖盆地地下水中锶元素的地球化学特征,以盆地内15个钻孔中28组地下水水样的化学测试数据为基础,刻画盆地内地下水中Sr~(2+)的分布规律,并分析了Sr~(2+)与地下水中主要指标的相关性。结果表明,地下水Sr~(2+)浓度沿地下水的流动路径呈现出明显的水化学特征演化规律,总体上表现为山前冲洪积扇区浅层和深层地下水Sr~(2+)浓度普遍大于中部细土平原区的浅层和深层地下水Sr~(2+)浓度,SO_4·HCO_3型地下水中Sr~(2+)浓度大于HCO_3·SO_4型地下水中Sr~(2+)浓度值,浅层地下水中Sr~(2+)浓度大于深层地下水中Sr~(2+)浓度。Sr~(2+)浓度与TDS、TH及Ca~(2+)、Na~+、Mg~(2+)、HCO_3~-、SO_4~(2-)浓度正相关,表明地下水中Sr~(2+)主要来自水—岩相互作用过程中含锶矿物的溶解。研究成果开拓了地下水循环与演化研究的思路,提供了一种分析水文地质问题的新方法。
In order to study the geochemical characteristics of strontium in the groundwater of Zhangye basin, based on the chemical test data of 28 groundwater samples from 15 boreholes in the basin, the distribution rule of Sr ~ (2+) in groundwater in the basin was described and analyzed The correlation between Sr ~ (2+) and groundwater was analyzed. The results show that the evolution of groundwater Sr2 + concentration along the groundwater flow path shows obvious evolution of hydrochemical characteristics. Generally, the concentrations of Sr2 + in shallow and deep groundwater in the alluvial fan sector are generally Which is greater than the Sr2 + concentration of shallow and deep groundwater in the fine plains of Central China. The concentration of Sr2 + in groundwater of SO4 · HCO3 type is greater than the concentration of Sr2 + in groundwater of HCO3 · SO4 type. The concentration of Sr ~ (2+) in groundwater is greater than the concentration of Sr ~ (2+) in groundwater. The concentration of Sr ~ (2+) was positively correlated with the concentration of TDS, TH, Ca ~ (2 +), Na ~ +, Mg ~ (2 +), HCO 3 ~ - and SO 4 2- in groundwater, 2+) is mainly due to the dissolution of strontium-containing minerals during the water-rock interaction. The research results have opened up the idea of groundwater circulation and evolution and provided a new method for analyzing hydrogeological problems.