| 陕西北部榆林第四纪地层剖面的粒度分析与讨论 |
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| 引用本文： | 李保生,董光荣,高尚玉,丁同虎,邵亚军.陕西北部榆林第四纪地层剖面的粒度分析与讨论[J].地理学报,1988(2). |
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| 作者姓名： | 李保生 董光荣 高尚玉 丁同虎 邵亚军 |
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| 作者单位： | 中国科学院兰州沙漠研究所
(李保生，董光荣，高尚玉，丁同虎)，中国科学院兰州沙漠研究所(邵亚军) |
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| 摘 要： | 本文根据榆林剖面及其粒度分析结果,讨论了剖面中地层的沉积相、古气候和环境演化.
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| 关 键 词： | 榆林剖面 黄土 古土壤 粒度 沉积相 古气候 |
ANALYSIS AND DISCUSSION ON THE GRAIN SIZE OF THE QUATERNARY STRATA PROFILE IN YULIN AREA OF THE NORTHERN, SHAANXI |
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| Li Baosheng Dong Guangrong Gao Shangyu Din Tonghu Shao Yajin.ANALYSIS AND DISCUSSION ON THE GRAIN SIZE OF THE QUATERNARY STRATA PROFILE IN YULIN AREA OF THE NORTHERN, SHAANXI[J].Acta Geographica Sinica,1988(2). |
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| Authors: | Li Baosheng Dong Guangrong Gao Shangyu Din Tonghu Shao Yajin |
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| Abstract: | The Quaternary Strata profile and its variations of grain size in Yulin area reveal that: the layers of sand, loess, and palaeosol in the profile were respectively formed by wind for-ce and the action of soil formation on the parent materials of aeolian sand and loess.
Since the early Quaternary, the Ordos Plateau has alternately undergone 11 stages of the depositions of shifting sands under extreme cold-dry climatic conditions, 7 times of fixed-semifixed dunes and 8 times of dust (loesses) under cold-dry climatic conditions; and that of the action of soil formation under 15 times of warm-wet climate and 3 times of temperate-wet climate (drab soils and black loams formed respectively).
The aeolian sand deposits already existed in the Ordos Plateau region at least in early Quaternary, and from that time up to now it has undergone a series of alternative processes of shifting sands semi fixed and fixed dunes-soils formation.
The region has been situated in the transitional belt of the Mongolian high pressure and the margin of ocean monsoon climate since the early Quaternary, and has been influenced re-peatedly by migrations of the lithofacies belts of sands, fixed-semifixed dunes, dust (loesses) and soils which have been caused by the climatic fluctuations of glacial age and interglacial age. |
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| Keywords: | :Yulin profile loess palaeosol grain size sedimentary facies palaeo-climate |
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