查格勒布鲁剖面—晚更新世以来东亚季风进退的地层记录

本文着重分析了查格勒布鲁剖面沉积物的粒度特征和孢粉组合特征，结合（１４）Ｃ测年、古冰缘现象和沉积物化学元素的ＳｉＯ２／Ａｌ２Ｏ３分子比值变化规律指出，晚更新世以来巴丹吉林沙漠南缘地区的气候条件随全球冰期气候的波动亦经历了由晚更新世早期的相对温湿阶段、晚更新世晚期尤其是末次盛冰期的干冷阶段向全新世温暖期的演化过程。东亚夏季风尾阎在晚更新世早期到达甚至越过本区影响到拐子湖一带，晚更新世晚期本区受冬季风的控制，全新世以来东亚夏季风尾闾又向本区推进，并于全新世大暖期对本区造成明显影响。

THE CHAGELEBULU SECTION :A STRATA RECORD OF THE ADVANCES AND RETREATS OF THE MONSOONS IN EAST ASIA SINCE LATE PLEISTOCENE

The evidences of climatic stratigraphy, which include sedimentary facies, grain size,composition, and Paleoperiglacial phenomena, indicate that the climatic evolutions in the south ofBadain Jaram Desert can be divided into 3 stages since late Pleistocene, which are two warmer andmoister ones in the early stage of late Pleistocene(Q) and in Holocene(Q1), and a dry and cold stagein the late stage of late Pleistocene (Q). The main elements which influence the climatic changes inthis area are the fluctuation of the quaternary glacial climate and the uplift of Qinghai-XizangPlateau.One of the evident phenomena of the climatic changes in this area is the advances and retreats ofthe summer monsoon fringe. During the 18ie interglacial period (Q), the fringe extended its range toGuaizihu, which lies to the north 180 km away from Chagelebulu, the iandscape was the temperatethorny tree grasslands. During the last glacial period, the winter monsoon dominated the climate in thisarea, the summer monsoon fringe, however, retreated to the middle-lower reaches of Changjiangdrainge basin, the landscape turned to temperate desert. During Holocene, the fringe come back towest and north, and formed sandy paleosol in sandy loess of Chagelebulu section in Holocene.