Hays等根据深海沉积物中古气候变化的记录曾指出,最近50万年里重大的气候变迁都跟随地球轨道几何要素的变化而发生,大陆上比较完整的黄土-古土壤序列大体上可以和第四纪深海沉积物剖面中δ~(18)O、有孔虫组合等的变化序列相对比,黄土剖面中CaCO_3含量变化既清晰地反映了黄土-古土壤序列的旋迥特征,还具有类似于深海沉积物中CaCO_3 According to records of paleoclimate changes in deep-sea sediments, Hays et al. Have pointed out that major climate changes in the recent 500,000 years have followed the changes in the geo-orbital geometry. The relatively complete loess-paleosol sequence on the mainland can generally be compared with the fourth In the sediment profile of Ji-Shen-Shenhai, the change sequences of δ 18 O and foraminifera assemblages are relative. The change of CaCO 3 content in loess profiles not only clearly reflects the rotation characteristics of loess-paleosol sequences, but also similar to the deep sea Sediment CaCO_3