黄土高原黄土地层的对比及细分

将前人对黄土高原黄土地层划分的研究成果进行全面总结、分析，结合洛川、宝鸡、西峰3个经典剖面，利用土壤 地层学、沉积学、磁性地层学、古生物学、年代学、地球化学等研究方法对黄土高原的黄土地层进行详细对比以及进一步 细分。将早、中更新世界线调整为B/M极性倒转开始的对应层位——L9顶部。根据岩性和气候旋回周期的差异性等，将离 石黄土三分，S8/L9作为离石黄土内部划分的一条新界线，S1~L5划分为上离石黄土，S5~S8划分为中离石黄土，L9~L15划分为 下离石黄土。在分析过程中发现关键层位（S0，L1，S1，S5，L9，L15，L33） 的年龄具有差异性。

Comparison and Subdivision of Loess Strata in the Chinese Loess Plateau

Based on the comprehensive analyses of the previous research on the loess stratigraphic classification in the Chinese Loess Plateau, and results from the three type loess/paleosol profiles, i.e., Luochuan, Baoji, and Xifeng, this article conducted detailed comparison and further subdivision of the loess strata in the Chinese Loess Plateau by using soil stratigraghy, sedimentology, magnetostratigraghy, paletontology, chronology, and geochemistry. This article adjusted the boundary of the Early Pleistocene and the Middle Pleistocene to the top of L9, which corresponds to the start time of the B/M polarity boundary, divided the Lishi Loess into three parts according to the difference in lithology and climate cycle periods, and added S8/L9 as a new boundary. As a result, S1-L5 are in the upper Lishi Loess, S5-S8 are in the middle Lishi Loess, and L9-L15 are in the lower Lishi Loess. A new problem arises that the ages of some key horizons such as the S0, L1, S1, S5, L9, L15 and L33 are different among these profiles.