萧县黄土剖面的磁化率测量及意义

The Magnetic Susceptibility Measurement and Its Significance of Xiao County Loess Section

新近发现的萧县黄土剖面是关于淮河北部地区黄土堆积的初次报导．野外观察表明，该剖面可划分为４层古土壤和４层黄土．对该剖面磁化率测量表明，该剖面的磁化率曲线与古土壤一黄土系列有着高度的一致性．９个磁化率阶段的划分，说明磁化率测量比野外观察更能反映物质组成和古气候的细微变化．磁化率曲线峰谷变化的特征暗示该剖面堆积过程中气候转型事件的存在，这一剖面的的发现，填补了淮河中下游地区缺少黄土堆积的空白．

Xiao County loess section found lately is the Initial report on leoss sediments ofthe northern area of the Huaihe River. The section can be divided into 4 beds of paleosol and 4beds of loess by field investigation. The measurements of the magnetic susceptibility(MS) showthat the MS curve of the section has close relation with the soil-loess sequence. The division of 9stages of MS indicats that the MS can reflect the more subtle changes of the material compositionand palecoclimates than field investigation. The characteristics of the crest and trough alternationsuggest the existence of incident of climate pattern change during the sediments of the section.The discovery of the section has filled in the gaps of the lack of loess sediment in middle andlower reaches of the Huaihe River.