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黄土属于粉砂岩类。粉砂岩占沉积岩的很大一部分。就以黄土和黄土状沉积为例,它分布的面积约占整个大陆10％。目前对粉砂岩的研究还远不如对砂岩、粘土岩、化学沉积和生物沉积岩等做得详细,所以也影响了对黄土的研究。我国黄河中游地区黄土的发育最为典型,其分布面积广,厚度大,沉积的地质时期也延续较长。这些条件都有利于对黄土进行岩石学研究。通过岩石学研究,不仅能对我国黄土的特征有所了解,有助于工程建设,并且还可以对现在还进行得较少的粉砂岩类的研究提供许多有意义的新资料。
Loess is siltstone. Silty sand accounts for a large part of sedimentary rocks. Take loess and loess sediments for example, its distribution area accounts for about 10% of the entire continent. At present, the research on siltstone is far less detailed than sandstone, clay rock, chemical sedimentation and biological sedimentary rock, so it also affects the research on loess. The development of loess in the middle reaches of the Yellow River in China is most typical. Its distribution area is wide and its thickness is large. The geological period of deposition also continues for a long time. These conditions are conducive to the study of loess petrology. Through the study of petrology, not only can we understand the characteristics of loess in our country, which is helpful to the construction of the project, but also provide many meaningful new data for the study of siltstone, which is still relatively small now.