The Periodicity of Organic Elements in the Yangguo Loess Section of Weinan and Paleoclimatic Evolution
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摘要: 渭南阳郭黄土剖面是迄今发现的１５万年以来较完整的剖面之一。作者对阳郭剖面中的有机质指标进行了概率分布与谱分析计算，得出了它们的概率分布类型及四个稳定的周期：６７.１Ｋａ、３３.５Ｋａ、２５.２Ｋａ和１８.３Ｋａ。这四个周期与洛川黄土剖面中元素组分变化的短周期基本一致；与深海岩芯δ１８Ｏ值和地球轨道要素变化的短周期基本吻合，表明第四纪的气候变迁是受天文因素控制的。Abstract: By now the Yangguo loess section is one of the most complete sections of the last 150, 000years. In this paper, the organic components that are bound up with the climatic variation have been studied by the mathematical methods. It can be seen that the probability distributions of loess and Paleosol from the Yangguo section are normal distributions which are differentiated by the mean and standard daviations, respectively. Four cycles stable which are 67.1Ka, 33. 5Ka, 25. 2Ka and 18. 3Ka, have also been recognized. The four periods mentioned above are consistent with the variations of the chemical components from the Luochuan section, and in line with oxygen isotopic values (δ18O) for deep-sea drilled cores and those calculated by Milankovitch for elements of Earth's orbits. That is because that the paleoclimatic evolution in the Quaternary period was controlled by some astronomical factors.
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Key words:
- periodicity paleoclimate evelution /
- organic components /
- yanggou loess section /
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