| 玛曲高原区潜水水化学和氢氧同位素特征 |
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| 引用本文： | 王振,郭华明,刘海燕,赵威光,刘帅,王娇,沈萌萌.玛曲高原区潜水水化学和氢氧同位素特征[J].水文地质工程地质,2021,48(1):18-26. |
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| 作者姓名： | 王振 郭华明 刘海燕 赵威光 刘帅 王娇 沈萌萌 |
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| 作者单位： | 1.东华理工大学水资源与环境工程学院，江西 南昌 330032 |
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| 基金项目： | 国家自然科学基金(41902243);中央高校基本科研业务经费(2652013028);博士科研启动基金(1410000691)。 |
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| 摘 要： | 玛曲高原区地下水是黄河的重要补给水源,然而其水化学特征及形成机理认识还十分有限。通过采集玛曲潜水、河水和黄河河道沉积物,系统研究了玛曲高原区地下水水化学、同位素特征以及水文地球化学过程。结果表明:河水和潜水的溶解性总固体含量低,分别为72~195 mg/L和207~459 mg/L,水化学成分以Ca2+和HCO3-为主,水样中砷浓度为0.46~17.7μg/L。氢氧同位素结果表明,地下水和河水补给来源为当地大气降水,河水相对潜水富集δ18O和δD。河水水化学组成主要受蒸发浓缩作用的影响,而潜水主要受碳酸盐岩溶解作用的影响。潜水水样SI白云石小于0的占68%,表明潜水中白云石处于不饱和状态。某些潜水砷含量超标的原因可能是沉积物铁锰氧化物矿物的还原性溶解,而砷的来源可能是玛曲河道和浅层松散沉积物中吸附态砷。研究成果有助于揭示黄河上游玛曲段地下水的来源及地下水化学成分的形成机理。
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| 关 键 词： | 黄河水源区 玛曲高原 稳定同位素 水-岩相互作用 含水层 |
| 收稿时间： | 2019-12-25 |
Hydrochemical and hydrogen and oxygen isotope characteristics of subsurface water in the Maqu Plateau |
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| WANG Zhen,GUO Huaming,LIU Haiyan,ZHAO Weiguang,LIU Shuai,WANG Jiao,SHEN Mengmeng.Hydrochemical and hydrogen and oxygen isotope characteristics of subsurface water in the Maqu Plateau[J].Hydrogeology and Engineering Geology,2021,48(1):18-26. |
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| Authors: | WANG Zhen GUO Huaming LIU Haiyan ZHAO Weiguang LIU Shuai WANG Jiao SHEN Mengmeng |
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| Institution: | 1.School of Water Resources and Environment Engineering, East China University of Technology, Nanchang, Jiangxi 330032, China2.State Key Laboratory of Nuclear Resources and Environment, East China University of Technology, Nanchang, Jiangxi 330013, China3.School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China |
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| Abstract: | Groundwater is an important source of recharge to the Yellow River in the area of the Maqu Plateau,but little is known about the groundwater hydrochemical characteristics and the formation mechanism.Phreatic water samples,surface water samples and sediment samples were collected from the study area to investigate their hydrochemical and isotopic characteristics and hydrogeochemical processes.The results show that river water and phreatic water samples have low salinity with Ca2+and HCO3-being the main constituents(TDS of 72?195 mg/L and 207?459 mg/L,respectively).Concentration of arsenic(As)in water samples range from 0.46μg/L to 17.7μg/L.The plot of hydrogen and oxygen isotopes shows that the phreatic water and surface water are mainly recharged from local meteoric water.The river water is relatively enriched in 18O and D relative to the phreatic water.The hydrochemistry of the river water are mainly influenced by evaporation,while the phreatic water is mainly influenced by rock weathering involving dissolution of carbonates.Saturation index of dolomite(SIdolomite)in 68%phreatic water samples is below zero,indicating that the phreatic water is unsaturated with respect to dolomite.As in the groundwater are possibly the result of reductive dissolution of iron-manganese oxide minerals in the unconfined aquifer sediments,which may be sourced from adsorbed As forms in the iron-manganese oxide minerals.This study is helpful in revealing the source of shallow groundwater and genesis mechanisms of groundwater chemicals in the upper stream of the Yellow River. |
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| Keywords: | the Yellow River catchment areas Maqu Plateau stable isotopes water-rock interactions aquifer |
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