中全新世以来查干淖尔古湖面波动  

Mid Holocene Paleolake Fluctuation of the Qehan Lake,Inner Mongolia,China

作　　者：刘美萍[1,2] 哈斯[1] 

机构地区：[1]北京师范大学资源学院,北京100875 [2]内蒙古师范大学地理科学学院,内蒙古呼和浩特010022

出　　处：《中国沙漠》2015年第2期306-312,共7页Journal of Desert Research

基　　金：国家自然科学基金项目(41171002,41261008)

摘　　要：内陆湖泊水位变化是对区域气候和水文变化的一种响应,古湖岸堤是过去湖泊水位变化的最直接证据。野外考察发现内蒙古高原查干淖尔湖周围存在海拔为1 026、1 023m和1 018m的3级古湖岸堤。根据光释光定年,其形成年代分别是6.83±0.37、4.26±0.29ka BP和2.42±0.15ka BP。利用DEM模型恢复得到的对应时期古湖面积分别是270、230km2和120km2。在6.83~4.26ka BP时段,查干淖尔古湖高湖面稳定在1 023~1 026m,比现代湖面约高7m,该时段气候相对湿润,4.26ka BP以来湖面持续下降,与区域性甚至全球性气候变化有着深刻的关系。Inland lake level changes are extremely sensitive to regional climate and hydrology change,and ancient shorelines are the most direct evidence of lake level changes.Through the field investigation,we found that there were three lake shorelines with elevation 1 026,1 023 m and 1 018 m around the modern Qehan Lake in Inner Mongolia and the OSL dating results of them were 6.83±0.37,4.26±0.29 ka BP and2.42±0.15 ka BP,respectively,and the paleo lake area were about 270,230 km2 and 120 km2,respectively.The high lake level of Qehan paleo lake stand on 1 023-1 026 m in 6.83-4.26 ka BP,about 8 meters higher than modern,the climate condition then was rather humid.The overall lake fluctuation since MidHolocene of Qehan paleo lake was downward and the variation was almost identical to those adjacent lakes inthe arid and semi-arid area.It showed that the Mid-Holocene environmental changes of the Qehan Lake had a profound relationship with the regional and even global climate changing.

关 键 词：全新世 查干淖尔湖泊 湖面波动 环境演化 

分 类 号：P534.6[天文地球—古生物学与地层学]