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地球学报  2003 

巴丹吉林沙漠湖泊及其下游地下水同位素分析

Keywords: 巴丹吉林沙漠,钙质胶结,环境同位素,承压地下水,湖泊

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Abstract:

本文通过环境同位素水化学等分析方法研究了祁连山北侧、龙首山、巴丹吉林沙漠、古日乃、拐子湖和额济纳盆地的泉水和井水的来源,揭示了巴丹吉林沙漠等下游地区的地下水来自于祁连山降水的补给,平均补给高程为3300m,祁连山顶部存在大片裸露的灰岩地层,雪水融化后沿着喀斯特地层或山前大断裂补给到深部,穿过龙首山直接补给到巴丹吉林沙漠及其下游地区,在沙漠湖泊中发现的钙华与钙质胶结证明地下水经过了石灰岩地层,承压水通过越流补给到浅部含水层,通过蒸发量计算得到的地下水补给量接近6×108m3/a,承压水中地下水的年龄为20~30a。

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