Particle Size Analysis of Aeolian Dust Derived from Duststorm and Non-duststorm
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The collected samples under typical duststorm and non-duststorm weather were used to make a particle size analysis, the results showed that there are many differences between the two samples. First, aeolian dust derived from duststorm has a light yellow colour while dark brown-yellow from non-duststorm, on which the two samples can be distinguished by eye. As a whole, both samples of duststorm and non-duststorm are essentially composed of two relatively common groups of grain with sizes of 5-6φ and >8φ. With poor sorting, dust derived from storm is courser than that from non-storm. The particle size distribution of sample derived from duststorm is approximatively normal while that from non-duststorm is bimode, which can be explained by the coaction of far and near existent sources and violent wind power sweeping course and fine grains. Compared with the particle size distribution of loess-paleosol with eolian cause of formation, modern eolian dust presents largely similarity to the ancient dust accumulation. Hint thus is given that modern aeolian sedimentary process in vogue continues from geological history and modern dust accumulation has ingenerated relationship with the ancient sediment.