新疆伊犁河谷晚全新世以来的风砂沉积与环境演化  

HOLOCENE AEOLIAN DEPOSITS AND ENVIRONMENTAL EVOLUTION IN YILI VALLEY,XINJIANG

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

机构地区：[1]福建师范大学地理科学学院,福州350007 [2]福建省亚热带资源与环境重点实验室,福州350007 [3]新疆师范大学地理科学与旅游学院,乌鲁木齐830054

出　　处：《海洋地质与第四纪地质》2010年第6期35-42,共8页Marine Geology & Quaternary Geology

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

摘　　要：通过对新疆伊犁塔克尔莫乎尔沙漠可克达拉剖面(TKP)有机碳(TOC)、氧化铁(Fe2O3)及频率磁化率(Xfd)的分析,探讨了新疆伊犁河谷晚全新世以来的气候演变。结果显示:3.71～1.50kaBP期间该区气候总体上比较干旱,气候干湿变化复杂,并经历了凉湿(3.71～3.06kaBP)、极端干旱(3.06～2.63kaBP)和相对湿润(2.63～1.50kaBP)的演变过程。1.50～0.50kaBP期间TOC、Fe2O3和Xfd的平均含量均达到全剖面的最高值,可能代表着这段时期区域降水比较丰沛,为伊犁河谷地区近4ka以来气候最为适宜的时期。0.5kaBP以来,伊犁河谷气候迅速地向干旱化发展。This paper discusses the Late Holocene climate evolution in the Yili Valley of Xinjinag,based on the TOC,Fe2O3and Xfdfrom the Keledala profile in Takermohur Desert.The result shows that,in the stage of 3.71～1.50kaBP,the climate in this area,as a whole,was relatively dry and experienced complicated changes.It was cold and humid during the period of 3.70～3.06kaBP;extremely dry during the period of 3.06～2.63kaBP,and relatively humid during the period of 2.63～1.50kaBP.The average contents of TOC,Fe2O3and Xfdreached the peak in 1.50～0.5kaBP.It indicates that precipitation in this area was relatively high then,and the climate reached the best since 4kaBP.Since 0.5kaBP,the Yili valley has remained in drought.

关 键 词：气候变化 晚全新世 可克达拉剖面 新疆伊犁 

分 类 号：P534[天文地球—古生物学与地层学]