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北京西山是中国末次冰期旋回风成黄土与古气候研究的经典地区。除风成黄土外 ,该区各种次生黄土也十分发育 ,由于后者的堆积速率较大 ,其环境变化的分辨率更高。次生黄土中S1古土壤由 3层古土壤夹两层黄土构成 ,L1中的古土壤由两层古土壤夹 1层黄土组成。经年代测定和古气候分析 ,S1中的 3层古土壤分别可与深海氧同位素 5阶段中的 3个暖期对比 ,S1中的两层黄土可与5阶段中的两个次阶段对比。
Beijing Xishan is a classic area in the study of loess and paleoclimate in the cyclonic winds of the last glacial period in China. Apart from aeolian loess, all kinds of secondary loess in the area are also well developed. Due to the large accumulation rate of the latter, the resolution of environmental changes is higher. Paleozoic in the secondary loess consists of three layers of paleosol with two layers of loess, and the ancient soil in L1 consists of two layers of paleosol with one layer of loess. According to the dating and palaeoclimate analysis, the three layers of ancient soils in S1 can be compared with three warm periods in the five stages of deep-sea oxygen isotope, respectively. The two loess layers in S1 can be compared with the two sub-stages in five stages.