从石英砂粒表面结构特征探讨吉林省西部沙地沙丘砂的成因

A APPROACH TO THE CAUSE OF FORMING OF THE DUNES IN WEST JILIN ACCORDING TO THE SURFACE FEATURES OF QUARTZ GRAINS

为了探讨吉林省西部沙地沙丘砂的成因,本文通过描电镜技术对吉林省西部沙地沙丘石英砂颗粒麦面结构特征进行了研究。根据其复合特征,划分出水动力作用、风力作用和化学营力作用三种类型。探讨了石英砂颗粒表面结构特征与环境的关系,它们经历了流水环境和风成环境。沙丘的物质来源是来自于现代河流和古代河流搬运来的碎屑物质。碎屑物质经风力吹扬作用短距离搬运堆积后形成沙丘,属原地起砂。

This paper researches the surface features of quartz grains from dunes of west Jilin hy the means of scanning electronic microscope in order to approach the cause of forming of the dunes.According to the integrated features,the author thinks that the three dynamic forces formed the features:water,wind and chemical action.After studing the relation between the surface features and their environment,the author thinks that sources of the dunes are the alluvial deposits from modern ri- vers and palerivers because the features reveal the quartz gra- ins formed in the subaqueous environment were transported by subsequent wind.