| 西北地区干枯湖床沉积粒度组成与东亚沙尘天气 |
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| 引用本文： | 岳乐平,杨利荣,李智佩,王珉,张维吉,聂浩刚.西北地区干枯湖床沉积粒度组成与东亚沙尘天气[J].沉积学报,2004,22(2):325-331. |
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| 作者姓名： | 岳乐平 杨利荣 李智佩 王珉 张维吉 聂浩刚 |
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| 作者单位： | 西北大学地质系,西北大学大陆动力学教育部重点实验室,西安,710069;中国科学院地球环境研究所,中国科学院黄土与第四纪地质国家重点实验室,西安,710075;西北大学地质系,西北大学大陆动力学教育部重点实验室,西安,710069;西安地质矿产研究所,西安,710054 |
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| 基金项目： | 中国地质调查局科研项目
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国家重点实验室基金 |
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| 摘 要： | 调查了准噶尔盆地玛纳斯湖、阿拉善高原居延泽及民勤盆地猪野泽等北方众多的现代干枯湖泊,重点分析了干枯湖床沉积物粒度组成。干枯的玛纳斯湖、古居延泽以及民勤盆地古猪野泽沉积物粒度分析结果表明,干枯湖床的地表湖相沉积物粒径小于10μm的颗粒占60%以上,干涸湖床上沙质草原地表也含有大量小于10μm的粘土颗粒,含量接近50%;而弃荒土地地表细颗粒物质散失迅速,民勤盆地弃荒土地地表粘土含量仅存不到13.9%。中国西北地区活动沙丘粒度组成小于63μm粒径的颗粒很少,小于10μm的颗粒微乎其微。因此西北沙漠地区活动沙丘沙对华北或华东地区影响相对较小。认为沙尘暴、扬沙或浮尘天气虽然多发生于中国西部沙漠、阿拉善高原沙区、河西走廊北部沙区以及蒙古东部、中部地区,但由于粗颗粒沙扬起高度与搬运距离有限,真正影响整个华北、华东地区的沙尘物质是小于63μm的粉砂级别的颗粒,特别是小于10μm的粉尘。认为影响东亚地区的粉尘天气物源不仅是中国西部的内陆沙漠、沙地,更重要的是干枯的湖泊、弃耕的荒地与裸露的沙砾草场。
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| 关 键 词： | 干枯湖泊沉积 粒度分析 东亚沙尘天气 中国西北地区 |
| 文章编号： | 1000-0550(2004)02-0325-07 |
| 收稿时间： | 2003-05-26 |
| 修稿时间： | 2003年5月26日 |
Grain-size Distribution of the Sediments of Dry Lake-bed in the Northwest of China and Sand-dust Weather in East Asia |
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| YUE Le-ping , YANG Li-rong LI Zhi-pei WANG Min ZHANG Wei-ji NIE Hao-gang.Grain-size Distribution of the Sediments of Dry Lake-bed in the Northwest of China and Sand-dust Weather in East Asia[J].Acta Sedimentologica Sinica,2004,22(2):325-331. |
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| Authors: | YUE Le-ping YANG Li-rong LI Zhi-pei WANG Min ZHANG Wei-ji NIE Hao-gang |
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| Institution: | 1.Key Laboratory for Continental Dynamics of the Ministry of Education, Geology Department, Northwest University,Xi'an 710069;2.State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi'an 710075;3.Xi'an Institute of Geology and Mineral Resources, Xi'an 710054 |
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| Abstract: | Some dry lakes widely distributed in the north of China has been investigated in this paper based on analysis of grain-size distribution of the sediments of these dry lakes, including Manas Lake in Junggar Basin, Juyan Lake in the Alxa Plateau, Yezhu Lake in Minqin Basin and so on. The analyzed results are as followed: the total volume-percentage of the particles (10 μm) of dry lake-bed surface sediments is above 60%. There are plenty of clay particles (10 μm) on the surface of sandy grassland developed from dry lake-bed and the content amount to about 50%. The tiny particles on the surface of abandoned land can be blown away easily and rapidly, so the content of clay particles in Minqin Basin is less than 13.9%. The grain-size distribution of active dune in northwest of China is the fewness of particles (63 μm) and very little of the particles(10 μm). Frequently, sands of active dune in northwest desert areas have weak influence on North China and East China. It is considered that although the weather of sand-dust storm, blowing-sand and suspending-dust occur originally in the western desert, sandy areas of the Alxa Plateau, the north of Hexi Corridor and the east, center of Mongolia, it is the sand-dust materials(63μm),especially those dust(10μm) really influence North China and East China for limitation of transportation distance and height of coarse particles. It is concluded that material sources that influence the sand-dust weather of East Asia are not only inland deserts, more importantly, but also the dry lake, abandoned land and bare sand-gravel grassland. |
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| Keywords: | dry-lake sediments grain-size analysis sand-dust weather in East Asia Northwest of China |
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