| 华北平原与大同盆地原生高碘地下水赋存主控因素的异同 |
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| 引用本文： | 王雨婷,李俊霞,薛肖斌,田小伟,迟秀成.华北平原与大同盆地原生高碘地下水赋存主控因素的异同[J].地球科学,2021,46(1):308-320. |
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| 作者姓名： | 王雨婷 李俊霞 薛肖斌 田小伟 迟秀成 |
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| 作者单位： | 中国地质大学环境学院,湖北武汉 430074;中国地质大学环境学院,湖北武汉 430074;中国地质大学生物地质与环境地质国家重点实验室,湖北武汉 430074;中国地质大学盆地水文学与湿地生态恢复实验室,湖北武汉 430074;中国地质大学环境学院,湖北武汉 430074;中国地质大学生物地质与环境地质国家重点实验室,湖北武汉 430074;河北省地矿局第四水文工程地质大队,河北沧州 061000 |
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| 摘 要： | 原生高碘地下水在我国有广泛分布，为查明不同区域地下水碘赋存机理的异同，通过选取我国大同盆地以及华北平原为代表性区域，完成区域地下水样品系统性采集及水化学、碘形态测试工作，对区域地下水水环境及其演化特征完成详细刻画.结果表明:大同盆地地下水总碘含量为2.86~1 286 μg/L，华北平原地下水总碘含量为2.40~1 106 μg/L，分别约有50.0%及49.5%地下水碘含量超过（GB19380- 2016）《水源性高碘地区和高碘病区的划定》中界定的100 μg/L国家标准.地下水水环境特征表明，在大同盆地，第四纪河湖相沉积所形成的，富含有机质、偏碱性、还原性、Na-HCO3型水环境，利于赋存于固相介质上的碘以碘离子的形式进入地下水中，沿地下水流向，富集于盆地中心排泄区；在华北平原，由第四纪6次海侵形成的冲湖积、海积松散沉积物中富含Na、Cl、I等元素，其偏碱性、还原性、Na-Cl型水环境及低水力坡度的平缓地形利于赋存在固相介质上的碘以碘离子的形式进入地下水，沿地下水流向富集于沿海排泄区.控制两个地区高碘地下水形成的相同因素是偏碱性及偏还原的地下水环境，且该环境下碘的主要赋存形态均为碘离子，但大同盆地高碘地下水形成主要受富有机质环境影响，而华北平原高碘地下水形成的主要受富碘的海相沉积控制.
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| 关 键 词： | 碘 大同盆地 华北平原 地下水 控制因素 环境地质 |
| 收稿时间： | 2019-10-22 |
Similarities and Differences of Main Controlling Factors of Natural High Iodine Groundwater between North China Plain and Datong Basin |
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| Wang Yuting,Li Junxia,Xue Xiaobin,Tian Xiaowei,Chi Xiucheng.Similarities and Differences of Main Controlling Factors of Natural High Iodine Groundwater between North China Plain and Datong Basin[J].Earth Science-Journal of China University of Geosciences,2021,46(1):308-320. |
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| Authors: | Wang Yuting Li Junxia Xue Xiaobin Tian Xiaowei Chi Xiucheng |
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| Abstract: | Natural high iodine groundwater is widely distributed in China. In order to find out the similarities and differences of mechanism of iodine occurrence in groundwater,the Datong basin and the North China Plain (NCP) were selected as representative areas in this study.Groundwater sampling and the analysis of hydrochemistry and iodine species were performed to understand the groundwater environment and hydrochemical evolution.The results showed that total iodine concentration in groundwater from Datong basin was 2.86-1 286 μg/L,and that in NCP was 2.40-1 106 μg/L. Approximately 50.0% and 49.5% of groundwater iodine from Datong basin and North China Plain exceed the national standard of 100 μg/L(GB19380- 2016),respectively. At the Datong basin,the groundwater environment was characterized by organic matter-rich,alkaline,weak reducing and Na-HCO3 type water,which was formed by Quaternary fluvial and lacustrine deposits. Under this environment,the sediment iodine was prone to be released into groundwater in the form of iodide and further enrich in the discharge area along the groundwater flow direction.At the NCP,the six transgressions in the Quaternary leads to the alluvial-lacustrine and marine loose sediments rich in Na,Cl and I. At the coastal area,the alkaline and weak reducing conditions in combination with low hydraulic gradient were favorable for iodine release from aquifer matrix to groundwater.The main species of iodine in groundwater was also iodide.The differences between two areas was that high iodine groundwater at Datong basin was mainly influenced by enriched organic matter in groundwater system,while that at NCP was mainly controlled by iodine-rich marine sediments. |
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