西北大学学报(自然科学版)

黄土的显微结构是在黄土物质堆积、成土作用过程中形成者。对它的研究有助于解决黄土成因、黄土工程地质性质等有关的理论与生产问题。根据扫描电镜和偏光镜下的观察分析,西安不同时代黄土显微结构特征按照碎屑颗粒的结构,粗颗粒的接触关系及胶结类型大致归纳为五种常见的主要类型:①粉砂细粒支架薄膜胶结类型。②粉砂细粒支架—镶嵌孔隙胶结类型,③粉砂细粒镶嵌一支架孔隙—斑状胶结类型,④粉土微粒分散—镶嵌斑状胶结类型及⑤粉土微粒分散基底胶结类型。

The microtexture of Loess is formed in the process of accumulation and pedogenesisof the loess original materials. The study of which is helpful to the solution of such theoretical aud practical problem as genesis of loess and its properties engineering geology.On the basis of the microscopic study under polarizerings and scanning electron microscope the microtextures of loess in various geological times in Xian district way be classified as the following five types:1、Silt fine-grain supportting film cemention type.2、Silt fine-grain supportting-mosaic porous cementation type.3、Silt fine-grain mosaic-supportting porous-porphritic cementation type.4、Silt micro-grain dispersed-mosaic cementation type.5、Silt micro-grain dispersed basic cementation type.