中文摘要：

腾格里沙漠南缘土门剖面41LD-52L层段由3层黄土状亚砂土、5层砂黄土、2层湖湘和2层古土壤组成,其年代为14 930~11 640aBP,相当于末次冰消期。分析结果表明,整个末次冰消期层段以粉砂含量占绝对优势,分布范围/平均值21.69%~79.47%/50.33%;砂含量次之,为3.97%~75.37%/38.17%;黏土含量最少,为2.34%~34.02%/11.50%。各不同粒级沉积物、Mz、σ等在垂直方向上呈相反的镜像对称变化。该层段粒度（Mz）指示腾格里沙漠南缘末次冰消期经历了4个以东亚夏季风为主的暖湿气候（W1-W4）与4个冬季风为主的冷干气候（C1-C4）,其中W2、W3和W4暖事件与格陵兰GRIP冰心记录的晚阿勒罗德（late Allerd）、早阿勒罗德和波令（Blling）等暖事件对应;C1、C2和C3冷事件与新仙女木（Younger Dryas,YD）和阿勒罗德（Inter Allerd Cold Period,IACP）冷事件对应。同时,该指标指示的新仙女木冷期（12650~11640aBP）与波令-阿勒鲁德暖期（14930~12650aBP）,可分别与格陵兰GRIP冰心氧同位素记录的新仙女木冷期、波令-阿勒鲁德暖期（B/A转换）在气候性质和相位上具有较好的对应关系。它们之间的良好的对比关系表明,腾格里沙漠南缘气候波动的驱动机制可能与格陵兰冰心代表的北半球高纬度热盐环流驱动机制密切相关。

英文摘要：

The Tumen sequence（41LD-52L）at the southern edge of the Tengger Desert in the northwestern China covers the time span of 14930-11640 aBP synchronously with the last Deglacial.It consists of 3layers of loess-like sandy loams,2layers of sandy loess,2layers of lacustrine facies,and 2layers of paleosol.The results of grain-size analysis show that silty sands dominate the major proportion ranging from21.69% upto 79.47% with an average of 50.33%;Sands comes the second with a distribution range of3.97%~75.37% and an average of 38.17%;The lowest proportion is clay,ranging from 2.34% to34.02% with an average of 11.50%.Symmetrical changes in grain-sizes,Mz andσare observed in vertical direction,indicating that the climate in southern Tengger Desert during the last deglacial had significantly varied for at least 4warm-cold fluctuations,including warm-humid phase W1-W4 and cold-dry phase C1-C4.The W2,W3 and W4,are corresponding to the late Allerd,early Allerd and Blling in the GRIP ice core record,respectively,while the C1,C2 and C3are corresponding to Younger Dryas（YD）and Inter Allerd Cold Period（IACP）.In addition,the Yonger Dryas（12650-11640aBP）and Blling-Allerd warm period（BA）（14930-12650aBP）indicated by grain sizes are corresponded well and in phase with oxygen isotope records（δ18 O）in GRIP cores,demonstrating that the driving force of such a change in southern Tengger desert is chiefly related to the thermohaline circulation in high nothern latitudes represented by Greenland ice core.