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黄土高原黄土地层的对比及细分
引用本文:王洋,孙洪艳,田明中. 黄土高原黄土地层的对比及细分[J]. 高校地质学报, 2015, 21(2): 346
作者姓名:王洋  孙洪艳  田明中
摘    要: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。

关 键 词:黄土高原  地质时代划分  地层对比  地层划分  离石黄土  年龄

Comparison and Subdivision of Loess Strata in the Chinese Loess Plateau
WANG Yang,SUN Hongyan,TIAN Mingzhong. Comparison and Subdivision of Loess Strata in the Chinese Loess Plateau[J]. Geological Journal of China Universities, 2015, 21(2): 346
Authors:WANG Yang  SUN Hongyan  TIAN Mingzhong
Abstract:Based on the comprehensive analyses of the previous research on the loess stratigraphic classification in the Chinese LoessPlateau, and results from the three type loess/paleosol profiles, i.e., Luochuan, Baoji, and Xifeng, this article conducted detailedcomparison 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 theMiddle Pleistocene to the top of L9, which corresponds to the start time of the B/M polarity boundary, divided the Lishi Loess into threeparts 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 theupper 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 ofsome key horizons such as the S0, L1, S1, S5, L9, L15 and L33 are different among these profiles.
Keywords:Chinese Loess Plateau  geological age division  strata contrast  strata division  Lishi Loess
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