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地质学报  2011 

鄂尔多斯白垩系盆地地下水的形成与演化:来自Cl及其同位素36Cl的证据

, PP. 586-595

Keywords: 鄂尔多斯,地下水,Cl,36Cl,蒸发作用

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Abstract:

鄂尔多斯白垩系地下水盆地地处中国西部干旱-半干旱地区,其南部和北部分别被黄土和沙漠覆盖,地下水水化学组成在区域上差异显著,北部以淡水为主,南部以微咸-半咸水为主。在沙漠区和黄土区的深层含水层中(埋深大于400m)分别采集了5组和3组水化学同位素样品。T和14C的分析结果表明,地下水的滞留时间在20343年内,并且未受到人工Cl的污染。依据地下水Cl及其同位素36Cl的组成,分析了蒸发作用对研究区降水补给和地下水Cl浓度的影响,结果表明,大气降水的蒸发富集作用和地层Cl的淋滤溶解作用对地下水中的Cl均具有重要作用,相对大气降水,沙漠区地下水蒸发浓集了29.9-63.0倍左右,蒸发作用为地下水提供了21.3-45.3mg/l的Cl,而在黄土区,地下水蒸发浓集了266.0-523.7倍,蒸发作用为地下水提供191.5-377.0mg/L的Cl。

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