郑州邙山官庄峪黄土地层研究

邙山官庄峪剖面共厚154.9 m, 出露S10及以上黄土-古土壤地层序列, 特征的马兰黄土厚度达70.125 m, 具有明显的粗粒、均匀特点, 且在该段地层中部, 并没有比较明显的弱古土壤层。磁性地层测量表明B/M界线置于深度132.04 m处, 位于L8的下部; 剖面底部未进入Jaramillo正极性亚时。与赵下峪剖面对比结果显示, 以B/M界线为标志, 72 m以下地层两者高度一致, 只是对地层的划分不同而已; 但赵下峪剖面中比较特征的具有较高磁化率值的L1SS1地层单元, 在官庄峪剖面却无明显表现, 其原因可能需进一步深入研究。 

STUDY ON THE GUANZHUANGYU LOESS STRATIGRAPHY IN MANGSHAN, ZHENGZHOU

The thickness of the Guanzhuangyu section in Mangshan is 154.9 m, with the loess-paleosol sequence of S10 and above exposed. The typical malan loess there is coarse grained and uniform with the layer thickness up to 70.125 m, and there is no obvious weakly developed paleosol layer in the middle of this strata. Magnetic stratigraphic measurement indicate that the boundary of B/M is located at the bottom of L8 with the depth of 132.04 m, and the bottom of the profile is not in Jaramillo. Compared with Zhaoxiayu section, it is shown that the heights of the strata below 72 m in both are highly consistent marked by the boundary of B/M, just with different stratigraphic division. However, the magnetic susceptibility values of the stratigraphic unit L1SS1 become apparently higher in Zhaoxiayu section, while there is no obvious change in Guangzhuangyu section. The reason for this phenomenon deserves further research.