This paper is the result of hydrogeological survey engineering.[Objective]In recent years, the drinking water health issues has been taken due to the improvement of living standards. Finding and developing high- quality groundwater with high- level minerals (e.g. H₂SiO₃) has become the key step in improving human health.[Methods]The hydrogeological survey and groundwater pollution survey were carried out in the Zhaojue County, and the spatial distributions of H₂SiO₃-rich groundwater, hydrogeochemical components characteristics and factors were revealed.[Results] The main results including:(1)The groundwater with H₂SiO₃ (≥ 25mg/L) was identified as the low salinity and alkaline water, which distributed in the six areas with the basement rocks of basalt. The H₂SiO₃ concentration was generally 25.74-46.04 mg/L, pH level was generally 7.4- 8.58, and TDS level is generally 49.4- 333 mg/L;(2)The H₂SiO₃- rich groundwater of study area was characterized by the low mineralization while the main hydrochemical types of groundwater are HCO₃- Ca·Mg and HCO₃- Ca;(3) The H₂SiO₃- rich groundwater was influenced by the water- rock interactions, the distribution range and solubility of silicate minerals, the development of surrounding rock fissures, and water conservation and recharge conditions in the county, among which the water- rock interactions play a critical role; (4) It is necessary to further reveal the main factors affecting the distribution and migration of H₂SiO₃ in groundwater in the subsequent development and utilization process.[Conclusions]The results can provide a basis for the development of mineral water industry and the construction of urban and rural high-quality water sources in Zhaojue area.
Highlights: The spatial distribution characteristics and hydrochemical characteristics of high-quality metasilicate groundwater were systematically summarized in Zhaojue County; The formation mechanism of high-quality metasilicate groundwater was discussed from the perspective of formation conditions and water-rock interaction.