【摘要】 巴丹吉林沙漠湖泊中的钙华和根状结核的存在证实这些沙丘和湖泊形成的时间约3万年,而且基本上没有发生大的改变。同位素和水化学研究结果证实湖泊水与祁连山深大断裂中的地下水有关,湖泊群正好位于阿尔金断裂东端,祁连山断裂与阿尔金断裂在玉门一带相交,祁连山断裂的地下水汇入阿尔金断裂后最终补到巴丹吉林沙漠的湖泊群中;而钙华与根状结核是地下水通过碳酸盐岩地层后形成的。更多还原

【Abstract】 The existence of lacustrine tufa and root-shaped nodule in Badain Jaran Desert proves that the sand dunes and lakes were formed 30 ka ago, and have remained basically unchanged. Results from isotopes and water chemistry studies prove that the water in the lakes has something to do with the groundwater in the deep fault of Qilian Mountain. The lake group is just situated at the east end of the Altun fault. The deep fault of Qilian Mountain joins with the Altun fault in Yumen. The groundwater in the deep fault of Qilian Mountain converges into the Altun fault and at last to the Badain Jaran Desert. The tufa and root-shaped nodule should be formed by the groundwater that running through carbonate rocks.更多还原