| 北京斋堂雁翅地区的黄土 |
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| 引用本文： | 赵希涛,曲永新.北京斋堂雁翅地区的黄土[J].地质科学,1981,0(1):47-54. |
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| 作者姓名： | 赵希涛 曲永新 |
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| 作者单位： | 中国科学院地质研究所 |
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| 摘 要： | 北京西山永定河支流清水河流域的斋堂盆地,是著名的“马兰黄土”的得名地,是我国黄土与三趾马红土首次划分之处。斋堂、雁翅一带又是京郊黄土最为发育的地区之一。近百年来,已见不少有关本区黄土与地文期的报导。
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| 关 键 词： | , |
| 收稿时间： | 1979-11-10 |
| 修稿时间： | 1979-11-10; |
LOESS OF ZHAITANG AND YANCHI REGIONS,BEIJING |
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| Zhao Xitao,Qu Yongxin.LOESS OF ZHAITANG AND YANCHI REGIONS,BEIJING[J].Chinese Journal of Geology,1981,0(1):47-54. |
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| Authors: | Zhao Xitao Qu Yongxin |
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| Institution: | Institute of Geology, Academia Sinica, Beijing |
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| Abstract: | Zhaitang Basin is the region where the "Malan loess" was named,and the loess and the Hipparion red clay were first distinguished here.However,knowledges about the composition,texture,origin and age of the loess in this area are still insufficient.As a result of the field geological survey of two loess profiles of Zhaitang and Yanchi (Fig.1 and 2,picture 1 and 2),the authors discovered that the primary loess consists of the Lishi loess and Malan loess,two deposits different in age and lithology.They are distributed widely on the flat surface above the third terrace defined by the authors.However,Malan loess underlies also inconformably under the Malan gravels which constitute the Malan terrace,but does not overlie on the Malan terrace.Thus,Malan loess was formed earlier than the Malan gravels.Based on the detailed studies of their grain-size distribution (Table 2),detrital and clay minerals (Table 2 and 3,picture 3),physical and chemical properties (Table 4) and microtexture (picture 3-6),following conclusions can be obtained: The loess was formed by soil formation of dust materials which were transported and deposited by wind in the dry and cold chimate.Prom the fact that during the period of deposition of Lishi loess the climate was more humid and warmer than that for the deposition of Malan loess,they are of somewhat different characteristics.The alternate occurrences of loess and its buried soil suggest the rhythmical changes of dry-cold climate and humid-warm or humid-hot climate. |
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