青海湖南部贵南地区天然矿泉水形成机制

    Formation mechanism of natural mineral water in Guinan area of the southern Qinghai Lake

    • 摘要: 贵南地区地处黄河上游龙羊峡段水源涵养功能区,矿泉水资源十分丰富,研究程度较低,基本处于未开发利用的天然状态,且研究区内部分村镇饮用水困难,研究矿泉水的赋存分布与形成机制对区内矿泉水可持续开发利用及解决分散村镇居民饮水问题具有重要意义。采用统计分析、水化学同位素等图解分析方法,系统梳理研究区矿泉水的分布特征,从水化学、同位素及围岩微量元素背景值等方面综合探讨锶型天然矿泉水的成藏机制。结果表明: 贵南地区地下水体中Sr含量为0.42~2.46 mg/L,平均含量为0.92 mg/L,整体属于弱碱性锶型矿泉水; 水化学组分主要受水-岩相互作用控制,区域岩石中高Sr的背景值为矿泉水的形成提供了物质来源,高度发育的基岩裂隙为矿泉水的形成提供了良好的运移空间。研究成果可解决部分居民用水困难, 为后续矿泉水资源可持续开发利用提供定向靶区,助力青海省矿泉水高质量发展。

       

      Abstract: Guinan area is located in the water conservation function area of Longyangxia section in the upper reaches of the Yellow River. The mineral water resources are very rich but with low degree of research. This area is basically in a natural state without exploitation or utilization, and the drinking water in some villages and towns is difficult to get. It is of great significance to study its occurrence, distribution and formation mechanism for the sustainable development and utilization of mineral water in this area and to solve the problem of drinking water in scattered villages and towns. The distribution characteristics of mineral water in the study area were systematically sorted out by statistical analysis, water chemical isotope and other graphic analysis methods. The accumulation mechanism of strontium-type natural mineral water was comprehensively discussed from the aspects of water chemistry, isotope and trace element background value of surrounding rocks. The results show that the strontium content in the groundwater in Guinan area ranges from 0.42 to 2.46 mg/L, with an average content of 0.92 mg/L, which belongs to the weakly alkaline strontium mineral water. Its hydrochemical composition is mainly controlled by water-rock interaction, and the background value of high strontium in regional rocks provides the material source for the formation of mineral water. The highly developed bedrock fissures provide a good migration space for the formation of mineral water. The research results could solve the difficulty of water use for some residents and provide a directional target area for the sustainable development and utilization of subsequent mineral water resources, and help the high-quality development of mineral water in Qinghai Province.

       

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