|
|||||
|
|
| 60 ka来腾格里沙漠东南缘风成沉积与沙漠演化 | |
| 引用本文： | 强明瑞,李森,金明,陈发虎.60 ka来腾格里沙漠东南缘风成沉积与沙漠演化[J].中国沙漠,2000,20(3):256-259. |
| 作者姓名： | 强明瑞 李森 金明 陈发虎 |
| 作者单位： | 1. 兰州大学,地理科学系,甘肃,兰州,730000;中国科学院,寒区旱区环境与工程研究所,甘肃,兰州,730000 2. 佛山大学,地理系,广东,佛山,528000 3. 兰州大学,地理科学系,甘肃,兰州,730000 |
| 基金项目： | 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!( 4 98710 72 ) |
| 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，了６０ｋａ以来各里沙漠演化的时间序列，并结合咯地层粒度组分分析结果认为６０ｋａ以来腾格里沙漠演化共经５个阶段。６０～２０ｋａ Ｂ．Ｐ．，腾格里沙漠的范围远没有到达现在的位置：２０～１０ｋａＢ．Ｐ．，沙漠东南部得到固定，沙漠范围缩小；１１～８．１ｋａＢ．Ｐ．与５．２ｋａ 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 |
| 修稿时间： | 2000-03-30 |
Aeolian Deposits on the Southeastern Margin of Tengger Desert and Desert Evolution during the Last 60000 Years |
|
| QIANG Ming-rui,LI Sen,JIN Ming,CHEN Fa-hu.Aeolian Deposits on the Southeastern Margin of Tengger Desert and Desert Evolution during the Last 60000 Years[J].Journal of Desert Research,2000,20(3):256-259. | |
| Authors: | QIANG Ming-rui LI Sen JIN Ming CHEN Fa-hu |
| 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 \{\}\ \{14\}C 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. |
| Keywords: | Tengger Desert aeolian deposits grain size desert evolution |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ | |