论文部分内容阅读
1970年我在甘肃静宁、会宁、通渭、庄浪和宁夏西吉、隆德、固原等县进行过区域地质测量工作。现就这些地区分布的黄土提出一些粗浅的看法,供同志们研究时参考。一、黄土的概况黄土约占测区面积的70％以上,为区内第四纪的主要堆积物。分布在测区南部的梁、峁及北部的梁上。在平缓的斜坡和一些凹地也有分布。岩性为浅黄、灰黄色的均匀粉土,体轻质较纯。结构松散,多孔隙(其最大直径约1毫米)。无层理,具湿陷性,垂直节理发育。黄土的微地貌特征如陷穴、黄土桥、黄土柱等较多见。
In 1970, I conducted regional geological surveys in Jingning, Huining, Tongwei, Zhuanglang, Gansu, and Xiji, Lund and Guyuan counties in Ningxia. We now offer some superficial views on loess distributed in these areas for our gratitude for reference. I. Overview of loess Loess accounts for more than 70% of the total area of the survey area, which is the main deposit of Quaternary in the area. Be located in the southern section of the beam, 峁 and the northern beam. In the gentle slope and some concave also have distribution. Lithology is light yellow, gray and yellow uniform silt, lighter body than pure. Loose structure, porous (maximum diameter of about 1 mm). No bedding, collapsible, vertical joint development. Loess microtopography such as subsidence, loess bridge, loess column more see.