陕北地区黄土地层基本特征

    BASIC CHARACTERISTICS OF LOESS STRATUM IN NORTHERN SHAANXI

    • 摘要: 陕北地区是我国黄土高原典型的黄土分布区,由于黄土地层厚度大、序列全且切割深,因此出露有黄土高原最为典型的黄土层型剖面。由于地理、气候等方面的原因,陕北黄土地层存在着极其明显的地区差异,迄今为止关于陕北黄土地层区域特征的研究仍然较少。本文在大量野外调查的基础上,绘制了陕北靖边、米脂、延川、洛川等典型地区的黄土剖面柱状对比图,并对陕北黄土地层基本特征进行了研究。发现陕北黄土地层分布具有一定的规律性。本文结论支持了黄土的风成成因观点,并可为陕北地区古气候、古环境演变的研究提供参考。

       

      Abstract: Northern Shaanxi is the typical loess-distributed area of China. It has the the most typical loess layer profile of loess plateau due to the large formation thickness, the full sequence and deep dissection of its loess strata. Factors including geography and climate have contributed to obvious regional differences among loess strata in northern Shaanxi. Nonetheless, studies on the regional features of loess strata in northern Shaanxi are relatively insufficient till now. This paper, based on a large number of field investigation, draws stratigraphic correlation diagrams of such typical areas as Jing Bian, Mi Zhi, Yan Chuan and Luo Chuan. It further analyzes the basic features of loess strata in northern Shaanxi. The paper finds that the distribution of loess strata in northern Shaanxi has a certain regularity. It provides evidence for and supports the viewpoint of the eolian of loess. Hopefully, it can also serve as a reference for studies on the evolution of paleoclimate and paleoenvironment in northern Shaanxi region.

       

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