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Abstract
The source of metasilicate in mineral water of Jingyu County. located in Changbai Mountains of northeastern China, was analysed through two groups of water-rock interaction experiments. One is a hydrolysis immersion experiment using basalt and the other is an immersion experiment utilizing a mixture of soil, scoria, and clastic basalt under the same conditions. Results indicate that the metasilicate in mineral water is mainly derived from the hydrolysis of silicates and silica in the basalt, scoria, and soil. In the first immersion experiment, the release of metasilicate is linear, with dissolved metasilicate increasing continuously through time at a stable release rate of about 0.01 mg/(kg·day). The second experiment indicates that the contribution of soil and scoria to metasilicate in mineral water is higher than that of clastic basalt under the same conditions.
Highlights
Many studies on hydrogeochemical characteristics of groundwater and on water-rock interactions have been conducted by different scholars [1,2,3,4]
The concentration of metasilicate in the clastic basalt, scoria, and soil immersion solutions all exhibit a progressive increase through time (Fig. 3)
In terms of change of increase, the increasing rate of the concentration of metasilicate in basalt and scoria immersion solution is retarded in the later stage, whereas that for the soil immersion increases at a greater rate in the later stage of the experiment
Summary
Many studies on hydrogeochemical characteristics of groundwater and on water-rock interactions have been conducted by different scholars [1,2,3,4]. The interpretation of geophysical exploration and drilling from the view of hydrogeology shows that thickness of the basalt in Jingyu County is less than 150 m, and the lower part is the Neogene mudstone and sandstone with a thickness of less than 50 m, which is in turn underlain by the Archean metamorphic rock stably distributed and forming a water-resistant floor in the area. This floor constrains the deep circulation of groundwater and indicates that natural mineral water is formed by the circulation of shallow groundwater [6]. This study was carried out to determine the source of metasilicate in mineral water of Jingyu County through two hydrolysis immersion experiments, the first using basalt and the second a mixture of soil, scoria and clastic basalt under the same conditions
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