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《Arid Land Geography》 2008-01
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Simulation of grain size distribution of Xining loess accumulation

ZHAO Jin-hui1,2,LU Hua-yu2,MEI Fan-min2,ZHANG Xiao-ye2,LI Yang2,WEN Ling-juan2(1 Institute Entironment of Hubei University,Wuhan 430062,Hubei,China;2 State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,CAS,Xi'an 710075,Shaanxi,China)  
In the paper,the grain size data of loess profile at the Panzishan Mountain of Xining City in the northeast edge of the Qinghai-Tibet Plateau are fitted with the logarithm normal distribution function.The results show that the grain size distribution of the Panzishan profile has five grain size pattern combinations to logarithm normal distribution.The grain sizes of the layers of the profile can be classified approximately into five groups,and the grain sizes are in the scope of the average grain diameter of 0.4 μm,9 μm,20 μm,40 μm and 63 μm,respectively.The scope ratios of the different grain sizes in the whole grain size distribution are rather close;and the clay,extremely fine silt groups have the bad sorting degrees.The grain size distribution mode of the Panzishan profile is different to a certain extent from that of the Loess Plateau.The group of the grain size less than 4 μm accounts for 11%-16% in paleo-soil,and 8% in loess.In the loess accumulating stage or in the ancient soil developing stage,the proportions of the grain size groups of 20 μm,40 μm,63 μm in the Panzishan profile are all larger than those in the profiles at Yanchang Area of the Loess Plateau,which indicates that the loess profile at the Panzishan Mountain of the Xining City has higher content of coarse grains compared to the profile at the Loess Plateau.Because of the overall drought climate,relatively weak pedogenesis effect in Xining Area,the effect of weathering to change the loess grain size composition is not obvious;in addition,the sand and dust produced by repeated ablation and abrasion of glaciers on the Qinghai-Tibet Plateau are the considerable coarse material supplies for loess;therefore the loess of the Panzishan profile has the diversified source material areas.
【Fund】: 国家自然科学基金(40325007和40121303);; 国家重点基础发展研究规划项目(G2000048703);; 中科院知识创新重要方向性项目(KZCX2-SW-118);; 湖北省科技厅自然科学基金(2005ABA064);; 湖北大学科研启动费(ky2004026)共同资助
【CateGory Index】: P931.6
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