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应用探地雷达对巴丹吉林沙漠南部高大沙丘下伏地层进行了探测,在探地雷达剖面沿线采集湖相沉积样品进行光释光测年。对探地雷达数据进行了处理与图像解译,探地雷达反射波与沉积相有相关关系,根据探地雷达数据与沉积信息重建沙丘下伏结构与沉积环境。研究发现,巴丹吉林沙漠南部该测区下伏地形平坦,流沙覆盖区的风成沙是覆盖在古湖相沉积层之上的。样品光释光测年结果反映,在MIS 5e阶段和MIS3阶段,巴丹吉林沙漠南部存在大湖期或高湖面,之后湖相沉积物或钙质胶结层与风成沙因不同的干湿环境而交替叠积;局部流沙覆盖区甚至在距今7ka前后还存在有浅湖-沼泽环境。质言之,在巴丹吉林沙漠高大沙丘的形成过程中,气候的多次波动是主要因素之一。
Ground penetrating radar was used to detect the underlying strata in the tall sand dunes of Badain Jaran Desert, and lacustrine sediment samples were collected along the GPR profile for photoluminescence dating. Ground penetrating radar data are processed and interpreted. Ground penetrating radar reflections are correlated with sedimentary facies, and the underlying structure and depositional environment of the sand dunes are reconstructed based on GPR data and sedimentary information. The study found that the underlying landform in the southern part of Badain Jaran Desert is flat and the aeolian sand in the quicksand area is overlain with the lacustrine sediments. The results of optical light-emitting dating of the samples indicate that there are large lakes or high lakes in southern Badain Jaran Desert in MIS 5e and MIS 3 stages, and lacustrine sediments or calcareous cementation and calcareous cementation are different due to different wet and dry environments Alternate stacking; local quicksand coverage even before and after 7ka there are still shallow lake - swamp environment. In other words, during the formation of tall sand dunes in the Badain Jaran Desert, multiple fluctuations of climate are one of the major factors.