中国沙漠形成演化的初步研究

A Preliminary Study on the Formation and Evolution of Deserts in China

古风成砂及风尘沉积物是地质时期沙漠形成演化的直接或间接标志。通过对中国北方大量的新生代古风成砂的特征分析、类型划分、年代测定和岩性岩相对比,初步建立了中国北方沙区新生代古风成砂地层序列,恢复了早第三纪、晚第三纪和第四纪时期中国沙漠形成演化的轮廓,进而探讨了第四纪沙漠的发展模式与沙漠性质。

In the past 10 years the authors and the others disvocered the paleo-eolian sands and assoviated sandy sediments of cenozoic Ero in the desert areas of China, which indicated directly or indirectly the formation and evolution of the deserts. On the basis of the fearure analysis, pattern division, dating, petrofeature and petrofacies comparison of the paleo - eolian sand strata,a stratigraphical sequence in the desert areas of Northern China was set up and the cutlines of the desert formation and evolution in early or late Tertiary and Quarternary periods were reconstructed. In addition, the development patterns and desert types in Quarternary periods Were discussed.