末次冰期以来柴达木盆地沙漠形成与演化

doi:10.11821/xb200303015

地理学报 ›› 2003, Vol. 58 ›› Issue (3): 452-457.doi: 10.11821/xb200303015

末次冰期以来柴达木盆地沙漠形成与演化

曾永年^1,2, 冯兆东¹, 　曹广超²

1. 兰州大学西部环境教育部重点实验室，兰州 730000；
2. 青海师范大学青藏高原资源环境研究中心，西宁 810008

收稿日期:2002-08-29 修回日期:2002-10-15 出版日期:2003-05-25 发布日期:2003-05-25
作者简介:曾永年 (1959-), 男, 博士生, 教授, 主要从事环境变化、环境遥感与GIS应用研究。 E-mail: zengyongnian@sina.com
基金资助:
国家自然科学基金资助项目(40071066; 49361006); 国家重点基础研究规划项目(G2000048701)

Desert Formation and Evolution in Qaidam Basin since the Last Glacial Epoch

ZENG Yongnian^1,2, FENG Zhaodong¹, CAO Guangchao²

1. National Laboratory of Western China's Environmental System, Lanzhou University, Lanzhou 730000, China;
2. Centre for Resources and Environment Research of Tibetan Plateau, Qinghai Normal University, Xining 810008, China

Received:2002-08-29 Revised:2002-10-15 Online:2003-05-25 Published:2003-05-25
Supported by:
National Natural Science Foundation of China, No.40071066; No.49361006; National Key Project for Basic Science Research, No.G2000048701

摘要/Abstract

摘要：

通过热释光测年，结合剖面岩性岩相特征、粒度等环境指标的综合分析，对柴达木盆地各地形面上古风成砂剖面进行了详细分析研究。将柴达木盆地沙漠形成与演化划分为3个阶段：21～15 kaBP的末次盛冰期是柴达木盆地大规模沙漠活动时期；15～10 kaBP的晚冰期柴达木盆地沙漠经历了多次扩展和固定缩小的波动演化；10 kaBP以来的全新世盆地沙漠经历了固定缩小和再次扩张的演化过程。自21 kaBP末次盛冰期以来，随着全球气候的波动变化，盆地沙漠虽经历了多次扩展与固定缩小的两相组合式波动演化过程，但流沙活动至今尚未完全停止过。现今盆地流沙活动是末次盛冰期以来沙漠演化过程中新近经历的又一阶段，是末次盛冰期流沙活动的承袭。

关键词: 沙漠演化, 柴达木盆地, 末次盛冰期

Abstract:

The Qaidam Basin is one of the areas where the deserts of the Qinghai-Xizang Plateau are mainly distributed. These deserts are mainly found in the southern margin and southeastern part of the Qaidam Basin, and areas around the three lakes, that is, east Taijinaier lake, west Taijinaier lake, and Dabuxun lake. The extensively distributed desert and loess recorded the environmental evolution history in this region. According to the environmental records and TL-date from stratigraphy of different types of loess, eolian sand sections in southeastern margin of the Qaidam Basin, we studied the processes of desert evolution in the concerned area since the last glacial epoch. The extensive desert which appeared 21-15 kaBP indicated that the desert was intensified in the last maximum glacial epoch. The eolian sand, loess, and paleosol layers of 15-10 kaBP are overlapped in sections, which indicated that the positive and reverse changes from the occurrence of the shifting sand to the spread and the fixation have taken place many times. Since 10 kaBP the desert had experienced fluctuating evolution process of reduction and expansion along with the global environmental changes and sand-drifting still continued at present day. The modern sand-drifting activities are another episode of desert evolution process since the last maximum glacial epoch, and the subsequent activities of drifting sand of the last maximum glacial epoch in the Qaidam Basin.

Key words: desert formation and evolution, Qaidam Basin, last maximum glacial epoch

曾永年,冯兆东,　曹广超. 末次冰期以来柴达木盆地沙漠形成与演化[J]. 地理学报, 2003, 58(3): 452-457.

ZENG Yongnian, FENG Zhaodong, CAO Guangchao. Desert Formation and Evolution in Qaidam Basin since the Last Glacial Epoch[J]. Acta Geographica Sinica, 2003, 58(3): 452-457.

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末次冰期以来柴达木盆地沙漠形成与演化

Desert Formation and Evolution in Qaidam Basin since the Last Glacial Epoch

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