关键词: 三大沙区, 古风成砂, 沙漠带形成演化

Abstract: 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.