新疆伊犁河谷晚全新世风沙沉积主量元素特征及其气候意义  

Major elements in aeolian sediments of the Late Holocene in Yili valley and their climatic implications

作　　者：靳建辉[1,2] 李志忠[1,2,3] 陈秀玲[1,2] 凌智永[3] 曹相东[3] 王少朴[3] 

机构地区：[1]福建师范大学地理科学学院,福建福州350007 [2]湿润亚热带生态-地理过程教育部重点实验室(福建师范大学),福建福州350007 [3]新疆师范大学地理科学与旅游学院,新疆乌鲁木齐830054

出　　处：《古地理学报》2010年第6期675-684,共10页Journal of Palaeogeography：Chinese Edition

基　　金："十一五"国家科技支撑计划项目(编号:2007BAC15B07);新疆维吾尔自治区自然科学基金项目(编号:200821103)共同资助

摘　　要：在新疆伊犁河谷塔克尔莫乎尔沙漠腹地,选择可克达拉剖面进行了光释光年代测定和主量元素含量分析,根据主量元素组合及其比值变化重建了研究区3.71kaBP以来的气候环境变化序列。结果表明,近4kaBP以来研究区气候环境演变大体经历5个阶段的变化:3.71～3.06kaBP,冷湿;3.06～2.78kaBP,暖干;2.78～2.10kaBP,凉湿;2.10～0.50kaBP,冷湿;0.50kaBP以来,凉干气候为主,最近100a趋于暖干。研究区晚全新世以来的气候变化阶段与中国东部季风区以及北半球气候变化阶段有很好的可比性,但各气候变化阶段的水热组合又具有典型的西风带气候模式特征,并与中高纬度北大西洋区域的气候变化具有很好的遥相关。The Takelmukul Desert is a fixed and semi-fixed desert,which interlaces with mobile dunes,lakes and rivers.The deposits in the Holocene stratum of the study region belong to aeolian facies.The Kekedala geologic section is selected and sampled for analyzing major elements and dating the forming age.The distributing characters and the integrated parameters of chemical elements corporately indicats that the regional climate has aridization tendency and has experienced several cycles between cold-humid（cool-humid）and warm-arid since 4 ka BP.On the whole,the climatic change can be divided into 5 stages：3.71～3.06 ka BP,cold and humid;3.06～2.78 ka BP,warm and arid;2.78～2.10 ka BP,cool and humid;2.10～0.50 ka BP,cold and humid;0.50 ka BP to present,cool and arid. It tends to be warm and arid in recent 100 years. The climatic stages have fairly good comparability among the study region,eastern monsoon areas and northern hemisphere.The hydro-thermal characteristic of each stage has typical characteristics of westerly climatic zone in the study region and has fairly good teleconnection between study region and mid-high latitude north Atlantic region.The paleoclimatical record of Kekedala section possibly reflects regional difference of global climate change. It must be mentioned that all of the climatic changes are based on precondition of aridity.

关 键 词：晚全新世 主量元素 地球化学 气候变化 塔克尔莫乎尔沙漠 伊犁河谷 

分 类 号：P512.21[天文地球—地质学]