Abstract
On basis of grade-standard deviation method, two sensitive grain size components (component 1:5.8∼10.0μm, component 2:60.3∼104.7μm) and a less sensitive grain size component (component 3:15.1μm∼22.9μm) were extracted from the samples of the sedimentary age of LX02 profile, which were collected from Longcheng Yardang region on the northeast edge of Tarim Basin. The study discusses the material sources and action forms of different grain size sensitive components, which can be used as an indicator to reveal the regularity of the lake and the intensity of wind-sand activity respectively. The lacustrine transgressive and regressive history of the region has been reconstructed for 72−51ka B.P. by the characteristics of the content of sensitive grain size component 2, and the palaeoclimate information of the sediments was restored, which provided the basis for exploring the distribution law of other environmental factors in lake sediments. This paper is helpful to explore the law of environmental evolution and the history of climate change in arid regions.
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