早更新世以来腾格里沙漠形成与演化的风成沉积证据

杨东; 方小敏; 董光荣; 彭子成; 李吉均

早更新世以来腾格里沙漠形成与演化的风成沉积证据

1 中国科学技术大学地球和空间科学学院, 合肥 230026;
2 兰州大学西部环境教育部重点实验室, 兰州 730000;
3 中国科学院青藏高原研究所, 北京 100085;
4 中国科学院寒区旱区环境与工程研究所, 兰州 730000

基金项目:

国家自然科学基金重点项目(40334038)

甘肃省自然科学基金(3ZS051-A25-009)

中国博士后科学基金(2004035574)

国家自然科学基金项目(40473006)

详细信息

作者简介:
杨东(1968-),男,副教授,在站博士后,主要从事区域资源、环境变迁与全球变化研究

中图分类号: P534.63
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出版历程
- 收稿日期: 2005-05-17
- 修回日期: 2005-09-11

AEOLIAN DEPOSIT EVIDENCE FOR FORMATION AND EVOLUTION OF THE TENGGER DESERT IN THE NORTH OF CHINA SINCE EARLY PLEISTOCENE

1 Department of Earth and Space Science, University of Science and Technology of China, Hefei 230026, China;
2 Institute of Tibet Plateau Research, Chinese Academy of Sciences, Beijing 100085, China;
3 National Laboratory of Western China's Environmental Systems & College of Resource and Environment, Lanzhou University, Lanzhou 730000, China;
4 Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China

摘要

摘要: 对陇西盆地六盘山西侧山麓剥蚀面上厚约223 m的断岘黄土-古土壤剖面的古地磁、磁化率和粒度进行分析,该剖面具有1.8 Ma以来完整的风成沉积旋回。主要应用砂粒百分含量(>63 μm)作为指示风成物质来源区沙漠范围和气候干旱的直接指标,初步发现腾格里沙漠自1.8 Ma以来至少有2次大的扩张与变化过程,分别发生在1.1和0.8 MaBP前后,表明腾格里沙漠的扩张与变化可能同全球性的冰量增加和冬季风增强以及区域性的青藏高原隆升有成因上的联系。
- 滕格里沙漠 /
- 形成与演化 /
- 早更新世 /
- 陇西盆地
Abstract: Analyses of paleomagnetic polarity reversals, magnetic susceptibility and grain size on the loess-paleosol sequence of Duanxian section, about 223 m thick, at a pediment of Longxi basin lying to the west of Liupan Mountain,show that this sequence contains most of the stratigraphic units recorded in the standard loess-paleosol section in the China Loess Plateau over the past 1.8 MaBP. Using sand particle percentage (>63 μm%) of the eolian sequence as a proxy indicator of desert extent and aridity in the dust source regions,the authors preliminarily found that during the past 1.8 Ma, there were two important climatic events indicating the advance of the Tengger Desert. The events occurred around 1.1 and 0.8 MaBP, respectively. The stepwise advance and changes of the Tengger Desert may have a close relation with the increase in global ice volume and monsoon change and uplift of the Tibetan Plateau in the late Cenozoic.
- formation and evolution /
- early Pleistocene /
- Longxi Loess /
- Tengger Desert

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参考文献(38)

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