奈曼旗作为科尔沁农牧交错带水源涵养区，区内发现的富锶—偏硅酸地下水，可为地下水 健康研究以及矿泉水开发提供契机。以内蒙古奈曼旗南部山区为靶区，基于水文地质调查与37 组 地下水样品测试数据，采用水文地球化学分析方法，揭示了富锶—偏硅酸地下水空间分异规律与 成因机制。结果表明，研究区地下水呈中性—弱碱性，水化学类型以HCO3-Ca 型为主，锶含量介于 0.24~1.83 mg/L，偏硅酸含量介于14.9~29.9 mg/L，富锶—偏硅酸复合型地下水分布在区内麦饭石 矿区周边；碳酸盐岩与硅酸盐岩风化溶解以及阳离子交替吸附促进了地下水中锶的富集，室内实 验表明，麦饭石的溶滤有利于偏硅酸地下水的形成；研究也指明了区内孔隙—裂隙含水层具备富 锶—偏硅酸地下水矿泉水开发潜力，为乡村振兴与地质资源协同利用提供科学依据。

Abstract： As a water conservation area in the Horqin agro-pastoral ecotone, Naiman Banner boasts strontium and metasilicic acid-rich groundwater, which provides opportunities for groundwater health research and mineral water development. This study selected the southern mountainous area of Naiman Banner, Inner Mongolia, as the target area. Based on hydrogeological surveys and test data from 37 groups of groundwater samples, hydrogeochemical analysis methods were employed to reveal the spatial differentiation patterns and formation mechanisms of strontium-rich and metasilicic acid groundwater. Results indicated that the groundwater in the study area is neutral weak alkaline, with HCO3-Ca as the main hydrochemical type. The strontium content ranges from 0.24 to 1.83 mg/L, and the metasilicic acid content ranges from 14.9 to 29.9 mg/L. The strontium rich metasilicic acid composite groundwater is distributed around the Maifanshi mining area in the area. The weathering and dissolution of carbonate rocks and silicate rocks, as well as the alternating adsorption of cations, promote the enrichment of strontium in groundwater. Indoor experiments have shown that the leaching of vermiculite is beneficial for the formation of metasilicic groundwater. The study also indicates that the pore fissure aquifer in the area has the potential for industrialized development of strontium and metasilicic acid-rich mineral water, providing scientific basis for rural revitalization and coordinated utilization of geological resources.