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地质学报  2007 

鄂尔多斯白垩系自流水盆地地下水锶同位素特征及其水文学意义

, PP. 405-412

Keywords: 鄂尔多斯盆地,地下水,锶同位素

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Abstract:

鄂尔多斯白垩系自流水盆地北部为沙漠高原区,南部为黄土高原区。区内经济以农业和畜牧业为主,地下水的污染较弱。地下水中Sr来源于含Sr矿物的溶解。因此,可以利用Sr及87Sr/86Sr比值来研究水岩作用和地下水的演化。采自盆地20个Sr及其同位素样品的分析结果表明在区域上87Sr/86Sr比值是不均匀的,西南部87Sr/86Sr比值较大(0.711002~0.711570),其他地区87Sr/86Sr比值较小(0.710378~0.710646);在局域地下水系统中,埋深小于100m的浅层地下水,Sr含量较低,87Sr/86Sr比值较大,而埋深大于100m的深层地下水,Sr含量较高,87Sr/86Sr比值较小,并且沿地下水径流方向,Sr的浓度越来越高。苏贝淖湖是自流水盆地北部局域地下水系统的一个排泻区,湖水Sr含量较低,而87Sr/86Sr比值较大,其Sr同位素组成特征与浅层地下水一致,表明湖水来源于浅层地下水。

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