摘要
本文是我们借助扫描电子显微镜,对中国黄土石英颗粒表面特征、黄土微结构及黄土钙质结核结构等进行系统研究的同时,在工作方法上的初步总结。大量资料表明,扫描电子显微镜在黄土微结构研究中有重要作用,合理、有效地运用扫描电子显微镜是获取黄土微结构翔实资料的可靠保证。文章重点介绍扫描电子显微镜下进行黄土微结构等研究的主要方法和步骤,包括样品的制备、观察方法及图象解译及结果等内容。
Since the 1970s,we have systematically studied the textures on the surface of quartzgrains,features of microtextures and the genesis of calcareous dolls in loess and paleosol usingscanning electron microscope.The results are of important theoretical and practical signifi-cance in discussion of the genesis and natures of pedogenesis and engineering geology andthe effects of environmental geology of loess in China.The microtexture types of loess under SEM depend on the contact relation betweencoarse minerals,features of pores and types and degree of cementation.On the basis of abovementioned features,the microtextures of loess in China may be classified into the following3 texture groups and 6 types:1.Supporting-mosaic texture group existing in the loess of the Late Pleistocene:includ-ing (1) supporting-macropore texture and (2) Mosaic-micropore texture.2.Semi-cementation texture group existing in the loess of the Middle Pleistocene:includ-ing (3) supporting macropore semi-cementation texture and (4) Mosaic-micropore semi-cemen-tation texture.3.Cementation texture group existing in the Early Pleistocene:including (5) Flocculentcementation texture and (6) Coagulum cementation texture.Meanwhile,according to the field features we have preliminarily divided the calcareousdolls of loess into five texture types (i.e.,Homogeneous,Concentric,Cored,Radial and Mor-tar structure) and three genesis types (i.e.,Syngenetic dolls,.Pedogenic dolls and Epigeneticdolls).In addition,this paper has highlighted on the method of studying microtextures of loessunder the Scanning Electron Microscope,e.g.,the preparation of samples,the explanation ofpictures,etc.
出处
《第四纪研究》
CAS
CSCD
1991年第3期282-288,T002,共8页
Quaternary Sciences
