Hydrochemical and hydrogen and oxygen isotope characteristics of subsurface water in the Maqu Plateau
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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
${\rm{HCO}}_3^- $ 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
${\rm{HCO}}_3^- $ -
Key words:
- the Yellow River catchment areas /
- Maqu Plateau /
- stable isotopes /
- water-rock interactions /
- aquifer
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表 1 研究区水化学特征
Table 1. Hydrochemical eigenvalues of the study area
参数 潜 水 河 水 最小值 最大值 均值 最小值 最大值 均值 井深/ m 3 36 16.5 − − − 水温/ ℃ 5.7 10.1 7.3 16.9 20.8 19.4 pH 6.8 8 7.5 7.68 8.78 8.35 ORP/ mV −98 95.7 −15.1 25.4 81.1 53.2 TDS/(mg·L−1) 207 459 320 72.0 195 165 Na+/(mg·L−1) 5.7 36.2 12 5.31 13.6 10.4 Ca2+/(mg·L−1) 45.1 182 106 31.6 49.8 44.3 K+/(mg·L−1) 1.3 18.7 4.4 1.29 1.64 1.43 Mg2+/(mg·L−1) 7.8 27.2 14.0 4.69 13.9 11.21 Cl−/(mg·L−1) 4.0 15.2 8.0 2.83 10.2 7.83 
/(mg·L−1)
3.5 90.6 18.5 5.05 19.2 14.8 
/(mg·L−1)
0.0 10.1 3.5 0.00 4.63 2.33 
/(mg·L−1)
258 601 382 136 199 175 Fe2+/(mg·L−1) 0.0 2.6 0.4 0.01 0.09 0.03 
−N/(mg·L−1)
0.0 0.9 0.2 0.01 0.14 0.04 As/(μg·L−1) 0.46 17.7 4.40 1.07 3.05 1.65 FeTal/(μg·L−1) 11.3 3980 754 14.3 97.2 43.0 MnTal/(μg·L−1) 0.5 1080 323 3.56 201 31.2 TOC/(mg·L−1) 0.8 8.1 2.6 1.76 6.84 3.26 δ18O/‰ −13.3 −10.2 −11.8 −11.5 −9.48 −10.6 δD/‰ −102 −78.2 −88.0 −87.0 −74.1 −79.8 SI方解石 −0.3 0.8 0.2 −0.31 0.97 0.60 SI白云石 −1.5 0.8 −0.4 −1.15 1.48 0.86 
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表 2 研究区水化学成分相关矩阵
Table 2. Correlation coefficient matrix of groundwater chemical compositions in study area
TDS 
Cl− 
Ca2+ K+ Mg2+ Na+ TDS 1 0.94** 0.60** 0.80** 0.96** −0.12 0.81** −0.13 
1 0.44** 0.63** 0.95** −0.29 0.80** −0.27 Cl− 1 0.46** 0.50** −0.11 0.46** −0.04 
1 0.81** −0.06 0.71** −0.08 Ca2+ 1 −0.30 0.80** −0.33 * K+ 1 −0.36* 0.73** Mg2+ 1 −0.23 Na+ 1 注：**表示在 0.01 水平（双侧）上显著相关；*表示在 0.05 水平（双侧）上显著相关。
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