| 湘南泥盆系碳酸盐岩区富锶饮用天然矿泉水成矿规律 |
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| 引用本文： | 周鑫,王璨,郑鹏飞,姚腾飞,巫政卿,米茂生,覃佐辉,李杨.湘南泥盆系碳酸盐岩区富锶饮用天然矿泉水成矿规律[J].中国岩溶,2022,41(2):197-209. |
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| 作者姓名： | 周鑫 王璨 郑鹏飞 姚腾飞 巫政卿 米茂生 覃佐辉 李杨 |
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| 作者单位： | 湖南省地质灾害调查监测所，湖南 长沙 410004 |
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| 基金项目： | 中国地质调查局地质调查项目“湖南新田县重点地区岩溶水勘查与开发示范”（1212010913039，1212011121159，1212011220957） |
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| 摘 要： | 湘南地区泥盆系碳酸盐岩分布广泛，文章在分析湖南省新田县新圩富锶饮用天然矿泉水形成的岩性、构造、水文地质条件、水文地球化学成因的基础上，通过探究影响锶富集的因素，揭示出泥盆系碳酸盐岩分布区富锶饮用天然矿泉水的成矿规律:泥盆系佘田桥组泥灰岩中锶的高丰度、相对封闭的地下水循环交替条件和弱的水动力条件是形成富锶饮用天然矿泉水的根本条件，循环深度和水温是锶富集的重要影响因素。湘南地区台盆相佘田桥组泥灰岩分布区是寻找富锶饮用天然矿泉水的首选靶区，特别是平缓的溶丘岗地地区的阻水断裂上盘以及靠近岩浆岩岩体和区域导热断裂附近是寻找富锶饮用天然矿泉水的有利地段。
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| 关 键 词： | 富锶矿泉水 泥盆系 碳酸盐岩 成矿规律 新田县新圩镇 |
| 收稿时间： | 2021-04-02 |
Metallogenic regularity of strontium-rich drinking natural mineral water in Devonian carbonate area in southern Hunan: Taking strontium-rich drinking mineral water in Xinxu town,Xintian county as an example |
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| Institution: | Hunan Institute of Geological Disaster Investigation and Monitoring,Changsha, Hunan 410004, China |
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| Abstract: | The study area is located in Xinxu, Xintian county, the middle of southern Hunan, in which Devonian carbonate rocks are widely distributed in the south of N26°30'. 44 samples have been taken from some boreholes and springs in different lithologic distribution areas in different seasons for many years. The sampling sites are located in the marl distribution area of Shetianqiao formation of Devonian interplatform basin (D3s). Testing statistics of these samples show that the strontium content of groundwater in ZK13-10, ZK1601 and ZK1602 boreholes is 1.66 mg·L?1, 6.76 mg·L?1 and 0.41 mg·L?1 respectively, which can prove the existence of strontium-rich drinking natural mineral water.Based on the analysis of lithology, structure, hydrogeological conditions, hydrogeochemical origin and influencing factors of strontium enrichment, the metallogenic regularity of strontium-rich mineral spring water in Devonian carbonate distribution area is preliminarily revealed. According to the statistics of rock and mineral analysis and test results of 80 groups of rock cores at different depths of 5 boreholes, the average content of strontium in marl of Shetianqiao formation of Devonian interplatform basin (D3s) is 524×10?6, peaking at 800×0?6, much higher than that in other rocks.The high abundance of strontium is the material basis for the formation of strontium-rich mineral water in the study area. Primarily, the content variety of strontium in groundwater is closely related to groundwater circulation conditions. Three spots of strontium-rich groundwater in the study area mainly come from strontium-rich water in the zone of deep subsurface flow. High circulation depth, relatively closed groundwater circulation and weak hydrodynamic conditions are the main constraints for the formation of strontium-rich mineral spring. Because the groundwater recharge runoff is restricted by topographic and geomorphic conditions, seepage conditions, fault structure location and water control properties, the farther the distance of groundwater recharge runoff is, the higher the circulation depth will be, and in turn the more conducive will be to the enrichment of strontium and the formation of deep strontium-rich water. The water temperature is another important factor affecting the enrichment of strontium in groundwater because it affects the dissolution and ion replacement of minerals containing strontium, and it also affects the CO2 content and corrosiveness in groundwater, thus affecting the enrichment of strontium in groundwater. Meanwhile, the circulation depth and geothermal field will control the groundwater temperature.The metallogenic regularity of Xinxu strontium-rich drinking mineral water shows that the marl distribution area of Shetianqiao formation of Devonian interplatform basin (D3s) is a favorable area for people to look for the strontium-rich mineral spring in southern Hunan. In particular, the hanging wall of water-blocking faults in gentle karst hills as well as the location close to magmatic rocks and regional thermal conductivity faults are the target areas. |
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