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中国沙漠 ›› 2000, Vol. 20 ›› Issue (3): 256-259.

• 论文 • 上一篇    下一篇

60ka来腾格里沙漠东南缘风成沉积与沙漠演化

强明瑞1,2, 李森3, 金明1, 陈发虎1   

  1. 1. 兰州大学 地理科学系, 甘肃 兰州 730000;
    2. 中国科学院 寒区旱区环境与工程研究所, 甘肃 兰州 730000;
    3. 佛山大学 地理系, 广东 佛山 528000
  • 收稿日期:2000-03-30 修回日期:2000-04-20 出版日期:2000-09-20 发布日期:2000-09-20
  • 作者简介:强明瑞(1973-),男(汉族),山西中阳人,博士研究生,主要从事干旱区环境变迁与全球变化研究。
  • 基金资助:
    中国科学院沙坡头沙漠科学试验研究站第三期开放基金(9719);国家自然科学基金(49871072)

Aeolian Deposits on the Southeastern Margin of Tengger Desert and Desert Evolution during the Last 60 000 Years

QIANG Ming-rui1,2, LI Sen3, JIN Ming1, CHEN Fa-hu1   

  1. 1. Department of Geography, Lanzhou University, Lanzhou 730000, China;
    2. Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China;
    3. Department of Geography, Foshan University, Foshan 528000, China
  • Received:2000-03-30 Revised:2000-04-20 Online:2000-09-20 Published:2000-09-20

摘要: 对腾格里沙漠东南缘风成沉积相典型剖面(中卫南山剖面)年代的测定,建立了60 ka以来腾格里沙漠演化的时间序列,并结合各地层粒度组分分析结果认为60 ka以来腾格里沙漠演化共经历了5个阶段。60~20 ka B.P.,腾格里沙漠的范围远没有到达现在的位置;20~10 ka B.P.,沙漠向东南方向大规模扩展,奠定了东南缘现代沙漠环境的格局;8.1~5.2 ka B.P.,沙漠东南部得到固定,沙漠范围缩小;11~8.1ka B.P.与5.2 ka B.P.至现代两阶段和现代沙漠环境接近。

关键词: 腾格里沙漠, 风成沉积, 粒度, 沙漠演化

Abstract: The ancient aeolian sand and dust has been thought of as the indicator that can indicate the formation and evolution of the desert within the past time.The signals of the desert evolution were well preserved in the aeolian deposits on the margin of desert,so these records are effective to reconstruct the desert evolution pattern.Moreover,the variation of grain size of the aeolian deposits may be caused by the strength of the wind which might result in the extension of the desert.Hence,the particle distrbution of the different layers can reflect the desert extension during the different periods.The typical stratum profile,named Zhongwei Nanshan section,can stand for the facie of aeolian deposits on the southeastern margin of Tengger Desert.Through TL and 14C dating samples and grain size analyses,the temporal sequence of Tengger Desert evolution was established,which combined with the particle distribution,the temporal and spatial pattern of the desert evolution over the past 60 000 years can be reached.Namely,The extent of Tengger Desert did not reach its current position during the period of 60~20 ka B.P.,however,it seriously extended southeastward within 20~11 ka B.P..The southeastern desert was fixed and its extent shrank from 8.1 ka B.P.to 5.2 ka B.P..During the periods of 11~8.1 ka B.P.and 5.2~0 ka B.P.,the desert extent was similar to the current.

Key words: Tengger Desert, aeolian deposits, grain size, desert evolution

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