Grain Size Differentiation of Dune Sand and Atmospheric Dustfall in the Taklimakan Desert
Grain size serves as a pivotal method to differentiate sand dunes from storm dustfall,with significant implications for understanding environmental changes and reconstructing historical aeolian activities.Samples of dune sands from the center of the Taklimakan Desert and the storm dustfall from the Cele Oasis,situated at the southern edge of the desert,were collected to analyze their grain size characteristics.Subsequently,a comparative analysis was conducted with dune sands sourced from various regions across China.The results indicated that:(1)The particle size distribution curves of dune sands in the Taklimakan Desert mainly exhibits unimodal distributions,while storm dustfall from the Cele Oasis exhibits bimodal distributions;(2)Both dune sands and storm dustfall in the Taklimakan Desert demonstrate well sorting,nearly symmetrical distributions,and moderate kurtosis,with dune sands exhibiting coarser particle sizes;(3)The relative content and particle size characteristics of identical particle size components of dune sands in different regions of China exhibit similarities.Despite the well sorting of both dune sands and atmospheric dustfall,differences in wind field intensity lead to variations in their particle size distribution ranges,skewness,and kurtosis.The findings of this study can provide a basis for distinguishing aeolian components within geological formations at desert fringe regions.
mobile dunegrain size characteristicunimodal distributionsedimentary differentiation
万方数据
维普
