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| 巴丹吉林沙漠高大沙山粒度组成及其意义 | |
| 引用本文： | 赵景波,张冲,董治宝,邵天杰,李恩菊.巴丹吉林沙漠高大沙山粒度组成及其意义[J].地质学报,2011,85(8):1389-1398. |
| 作者姓名： | 赵景波 张冲 董治宝 邵天杰 李恩菊 |
| 作者单位： | 1. 陕西师范大学旅游与环境学院,西安,710062;中国科学院地球环境研究所黄土与第四纪地质国家重点实验室,西安,710075 2. 陕西师范大学旅游与环境学院,西安,710062 3. 陕西师范大学旅游与环境学院,西安,710062;中国科学院沙漠与沙漠化重点实验室,兰州,730000 |
| 基金项目： | 国家自然科学基金项目（面上项目，重点项目，重大项目） |
| 摘 要： | 选取巴丹吉林沙漠东南部全球高差最大(约420m)的诺尔图湖东大沙山和较高的苏木巴润吉林湖西大沙山(高差约400m),对其迎风坡沉积物进行系统采样分析,讨论了高大沙山迎风坡沉积物粒度成分特点、变化规律、原因及其活动性.结果表明,全球高差最大的诺尔图东沙山和苏木巴润吉林湖西沙山迎风坡沉积物具有双层结构,表层沉积物的粒度组成... |
| 关 键 词： | 高大沙山 粒度组成 沙山活动 沙山物质运移模式 巴丹吉林沙漠 |
| 收稿时间： | 3/6/2010 8:54:31 PM |
| 修稿时间： | 2010/12/29 0:00:00 |
Particle size composition and its significance of Mega-dune in Badain Jaran Desert |
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| zhaojingbo,ZHANG Chong,DONG Zhibao,SHAO Tianjie and LI Enju.Particle size composition and its significance of Mega-dune in Badain Jaran Desert[J].Acta Geologica Sinica,2011,85(8):1389-1398. | |
| Authors: | zhaojingbo ZHANG Chong DONG Zhibao SHAO Tianjie and LI Enju |
| Institution: | Shaanxi Normal University |
| Abstract: | Sediments were sampled on the windward slope of a typical barchanoid compound mega-dune with a height of close to 420m in southeastern Badain Jaran Desert for grain-size distribution analysis. Study of grain composition and the reasons for variation of mega-dune, activity and changes in power of mega-dune. The analysis results indicate that the surface layer sediment size is higher than that of sub-surface layer on the windward slope of the mega-dune. The surface sediments contain almost the same fraction of medium and fine sands, being 47.48% and 39.43% respectively. However, the sub-surface sediments contain significantly higher fraction of fine sand. The content of medium and fine sand is 40.96% and 54.01%respectively. The fraction of very fine sand very coarse sand and coarse sand in both surface and sub-surface sediments is insignificant, and clay are absent. Wind erosion is responsible for the difference in grain size between the two layers. In general, grain on the crestal zone of the mega-dune is finer and better sorted than that at toe of wind-ward slope. The frequency distribution curve becomes more negatively skewed, but there is no typically changed on kurtosis. The reason of thinning from the lower to the top of the Mega-dune are terrain increase and slope increases.Coarser and more poorly sorted sediments appear on the middle to upper section of wind-ward slope of the mega-dune due to local topographical relief and air current. Mega-dune coarse granularity of the surface shows that, Material of mega-dune being in the event of mobile,is the activities mega-dune. Comparing Wind in the other dune of China, the wind is maximum in Badain Jaran Desert. that is the one reason of coarse granularity. That also must be the dynamic conditions to the formation of greatest mega-dune own height difference. |
| Keywords: | mega-dunes grain size composition mega-dune move Move model of mega-dune substance Badain Jaran desert |
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