吉林省长春莲花山地区地下水中锶及偏硅酸的形成机理研究

Formation mechanism of strontium and metasilicic acid groundwater in the Lianhuashan area, Changchun, Jilin Province

【研究目的】长春莲花山地区地下水中富含Sr和偏硅酸,查明地下水中锶及偏硅酸的形成机理具有重要意义。【研究方法】通过Piper三线图法及对研究区矿泉水形成的物质基础、水动力条件、水化学条件的深入研究。【研究结果】研究发现长春莲花山地区发育的松散岩、碎屑岩、火成岩是该地区地下水中锶及偏硅酸的富集的物质基础;大气降水与地表水入渗补给等为地下水长期与周围岩石(矿物)发生水解和溶滤作用、为地下水最终富锶及偏硅酸创造了条件。【结论】区域地层中存在16.3~80 m巨厚的基岩风化带,使富锶及富含偏硅酸的地下水呈面状分布,部分区域两种地下水同时存在,这一点不同与以往在基岩构造带上发现的线状分布的矿泉水源;前人在此区域上没有发现富含锶及偏硅酸的矿泉水,这一发现为地方经济发展提供了新的空间。

This paper is the result of geological survey engineering.[Objective] The groundwater in Lianhuashan area of Changchun is rich in strontium and metasilicic acid. It is important to understand the formation mechanism of strontium and metasilicic acid in groundwater. [Methods] The material basis, hydrodynamic conditions and hydrochemical conditions of the formation of mineral water in the study area were studied in depth by using the Piper three-line diagram method. [Results] It is found that the loose rock, clastic rock and igneous rock developed in Lianhuashan area of Changchun are the material basis for the enrichment of strontium and metasilicic acid in groundwater in this area;Atmospheric precipitation and infiltration recharge of surface water create conditions for the long-term hydrolysis and leaching of groundwater with surrounding rocks(minerals), and for the final enrichment of strontium and metasilicic acid in groundwater. [Conclusions]There is a 16.3-80 m thick bedrock weathering zone in the regional strata, which makes the groundwater rich in strontium and metasilicic acid distributed in a plane shape. In some areas, two kinds of groundwater exist at the same time, which is different from the linear distribution of mineral water resources found in the bedrock structural belt;No one in history has found mineral water rich in strontium and metasilicic acid in this area. This discovery provides imagination space for local economic development.