克里雅河流域沉积物的粒度特征

The Granularity Characteristic of Deposit in Keriya Drainage

克里雅河流域由普鲁至米萨来,冲积沙粒径向细递减;沙丘沙一般粗于下伏沙,而冲、洪积下伏地层上的沙丘风成沙则细于下伏沙;高大沙丘粒级组合主要受就近沙源影响。用累计百分数和粒级的φ值作图,求得φ_1、φ_5、φ_(16)、φ_(25)、φ_(50)、φ_(75)、φ_(84)、φ_(95)等8个数值,输入计算机获得最大粒径、中值粒径、平均粒径(M_z)、标准离差(σ_1)、偏度(S_(K1))、峰态(K_G)等值。

From Pulu to Misalai,the particle diameter of alluvial sand in Keriya drainage decreases progressively in fineness; generally, the particle diameter of sand from sand dune is coarser than that of underburied sand,but the partical diameter of aeolian sand from sand dune on alluvial and diuvial underlying horizon is more fine than that of underburied sand. Composition of partical fraction of tall sand dune is mainly affected by nearby sand source. To make a diagram with accumulative total percentage and Φ value of particle fraction, and evaluate eight values—Φ_1, Φ_5, Φ_(16), Φ_(25), Φ_(50), Φ_(75), Φ_(84), Φ_(95) and input them into computer in order to calculate maximum particle diameter, mid-value particle diameter, mean particle diameter (M_(?)), standard deviation(σ_1), separate degree (S_(K1)),kurtosis(K_G) and other values.