青藏高原全新世风沙活动历史与环境变化  

History of aeolian deposits in Tibetan Plateau and climate change over Holocene

作　　者：刘星星[1] 宋磊[1,2] 金彦香[1] 王亲[1] 

机构地区：[1]兰州大学西部环境与气候变化研究院,兰州730000 [2]中国地质科学院水文地质环境地质研究所,石家庄050061

出　　处：《干旱区资源与环境》2013年第6期41-47,共7页Journal of Arid Land Resources and Environment

基　　金：国家自然科学基金项目(批准号:41021091;40830105;40671192);新世纪优秀人才支持计划;兰州大学中央高校基本科研业务费专项资金资助

摘　　要：风沙活动记录的研究对于人们了解气候环境变迁有着重要意义。风成砂层的稳定出露可以作为风沙活动及沙漠形成的最直接证据,因而通过对风成砂-黄土-古土壤序列地层剖面进行对比分析,即可还原地质历史时期风沙活动历史与环境演化。通过对比青藏高原南部、柴达木盆地、共和盆地、青海湖盆地等地区风成沉积剖面的岩性变化,结合14C测年、热释光和光释光测年结果,建立了青藏高原地区全新世以来风沙活动演化历史。青藏高原全新世在11.0kaBP左右开始进入全新世,环境逐渐转向暖湿;9.0kaBP左右出现了一次强烈的风沙活动事件;7.7～4.6ka BP14C大部分地区为暖湿环境,而藏南地区有较大范围风成砂沉积,风沙活动强烈。全新世晚期区域性差异较大,但整体环境恶化,风沙活动增强。By comparing the lithological changes of aeolian sections in southern Tibetan Plateau,Qaidam Basin,Gonghe Basin,Qinghai Lake basin and other regions,combined with the 14C dating,the thermoluminescence（TL） and optically stimulated luminescence（OSL） dating,the time series of desert evolution in Tibetan Plateau was established during the Holocene.According to the 14C,TL and OSL dating of 31 aeolian sections,Holocene began at 11.0 ka BP in Tibetan Plateau and the climate became warm/humid;A strong dune activity event were observed around 9.0 ka BP.Palaeosol were widely distributed at 7.7~4.6ka BP,it suggests that the climate was optimum at this time.While in the southern Tibetan Plateau,aeolian deposits were widely distributed,which means the climate was cold/dry.There are great regional differences in Tibetan Plateau at the late holocene,the overall climate deteriorated and dune activity increased.Meanwhile,the existing problems were discussed and the future research direction of the climate change was proposed.

关 键 词：青藏高原 风沙活动 环境变化 全新世 

分 类 号：P425[天文地球—大气科学及气象学]