论文部分内容阅读
风成邙山黄土分布于河南郑州西北黄河南岸。黄土序列较完整，初步研究了桃花峪剖面Ｓ２以上黄土地层，Ｓ０、Ｌ１、Ｓ１、Ｌ２和Ｓ２分别厚０．６ｍ、７０．８ｍ、９．９ｍ、１２．４ｍ和１．０ｍ。特别有意义的是晚更新世马兰黄土厚度巨大，分辨率高。以１０ｃｍ间距对邙山桃花峪剖面进行了磁化率测量，并与海洋氧同位素时间序列进行对比，按Ｋｕｋｌａ等的磁化率年龄模式，获得相应的年代时间标尺。对末次冰期黄土以４０ｃｍ间距进行了粒度分析，不同冰期或冰阶的平均沉积速率和分辨率有很大的差异。特别是末次冰期晚冰阶黄土粒度所反映的冬季风振荡的频率和幅度都超过了格陵兰冰芯记录。邙山晚更新世黄土地层是进行高分辨率黄土地层与短时间尺度过去全球变化研究的极好对象
Fengcheng Dangshan loess is located in the south bank of the Yellow River in northwestern Zhengzhou, Henan. The sequence of loess is relatively complete. The loess stratum above S2 in Taohuayu section is preliminary studied. The thickness of S0, L1, S1, L2 and S2 are 0.6m, 70.8m, 9.9m, 12.4m and 1.0m respectively. Of particular interest is the late Pleistocene Malan loess with a large thickness and high resolution. The magnetic susceptibility of the TaohuaYu section was measured at 10cm intervals and compared with the marine oxygen isotopic time series. According to the magnetic susceptibility age model of Kukla et al., The corresponding chronological time scale was obtained. The grain size analysis of the last glacial loess at a 40 cm spacing was conducted. The average deposition rate and resolution of glaciers or glacial stages varied widely. In particular, the magnitude and magnitude of the winter monsoon oscillations reflected by the loess grade at the last glacial ice age exceeded that recorded by Greenland ice cores. Late Pleistocene Loess Plateau is an excellent target for the study of past global changes in high-resolution loess strata and short-term scales