Late Quaternary sporopollen records ad rapid climatic fluctuation events in the Yinchuan basin

Abstract: On the basis of the analysis of sporopollen from well CK1, the authors studied the events of climatic fluctuations of 10 ka and 1 ka scales since 150 ka BP and obtained the climatic change cycles from the sporopollen records of sediments in the Yinchuan basin by the frequency spectrum analysis. The study indicates that the climatic cyclic fluctuations of the 10 ka scale may be correlated with the variations of the Earth's orbital elements in the Milankovitch theory in the high-latitude areas, while the quasi-cycle of the 1 ka scale corresponds to D / O. This suggests that there exist climatic fluctuation events of 10 ka and 1 ka scales in the Yinchuan basin.