摘要
罗布泊于1962年全部干涸,干涸前湖面积约5400km2,目前湖底被厚20～40cm的盐壳覆盖,海拔约780m。盐湖北岸和东岸普遍发育三级湖积台地,其高度分别为783～785m,789m和810～820m,相应的湖面积分别为9250km2,20000km2和55000km2左右,根据释光和14C年代,它们分别形成于7.0～7.5kaB.P.,约30kaB.P.和90～130kaB.P.,与深海氧同位素第5和3阶段及全新世大暖期在时间上具有很好的对应关系。可见,位于亚洲腹地、气候极端干旱的罗布泊,在地质历史时期其湖面的扩张与收缩受全球气候变化因素驱动,其变化幅度的强弱则与区域环境因素有关。
Lop Nur,with the water area of 5400km^2 just before desiccated, dried up completely in 1962 along with the interfering by huamn utilization of the water for agricultural irrigation in the upper reaches of the main rivers. At present,the altitude of the lowest part of the playa surface,which covered by 20 - 40cm salt is about 780m a. s. l. Geomorphological and stratigraphical investigations revealed that three types of lake terraces developed at the northern and the eastern of paleo-Lop Nur and the elevation of these terraces are 783 -785m,789m and 810 - 820m,with the corresponding lake area of 9250km^2, 20000km^2 and over 55000km^2 respectively. According to the limited thermoluminescence（TL）and ^14C ages,it could be primaryly deduced that these lake terraces were formed at 7.0kaB. P. to 7.5kaB. P., 30kaB. P. and 90kaB. P. to 130kaB. P., and could be correlated to MIS 5c and MIS 3. If this conclusion is acceptable,then it means that the climatic changes in hypearid Central Asia have been controlled by the global changes and the area has a strong response to global changes.
出处
《第四纪研究》
CAS
CSCD
北大核心
2008年第1期150-153,共4页
Quaternary Sciences
基金
中国科学院地球环境研究所开放实验室部分经费资助
关键词
罗布泊
湖积台地
自然环境演变
全球变化
Lop Nur, lake terrace, environmental evolution, global changes
