【摘要】 从距今 18 0 0 0年的最后冰期最盛时期到距今 10 0 0 0年开始的全新世海侵 ,全球气侯发生过急剧的变化。位于亚洲东部的古季风活动也经历了盛衰变化。大量的钻孔及浅地层剖面分析资料已经证实 ,冰期最盛时期陆架区古季风活动加强 ,陆架出现了沙漠环境与黄土沉积。当冰期结束 ,气候转暖 ,冬季风减弱之际 ,南黄海陆架及长江三角洲一带的沙漠与黄土分布范围也随之缩小 ,原先的沙漠活动区变成了黄土分布区 ,也就是所谓硬粘土沉积区。随着古季风活动的进一步衰退和海面的不断升高 ,来自陆架区的东北风变为冷湿气流。长江三角洲地区和陆架上出现了有利于沼泽发育的环境 ,全新世海侵把泥炭层淹没。陆架区晚更新世末期以来的地层中出现沙层、硬粘土和泥炭层的沉积序列 ,即“三元沉积结构”,是古冬季风盛衰过程的最好记录更多还原

【Abstract】 From the LGM(18 ka BP) to the Holocene transgression(10 ka BP),great changes took place in world climate, including the paleo monsoon activity which occured in the Eastern Asia. It is verified by a lot of core data and shallow layer profiler records that the monsoon activity was strengthened in the LGM, the desert environmen and loess appeared on the shelf. When the glacial epoch ended, the weather became warmer, the winter monsoon got weaker and weaker, the extension of the desert along the Southern Yellow Sea and Changjiang River delta reduced and the range of the loess also reduced. Therefore, the region of the desert activity changed into that of loess activity, which is also called hard clay. With the farther decline of the paleo monsoon and the rise of the sea surface, the east north wind from the shelf was the cold wet air stream. The environment which was propitious to the growth of swamp appeared in the shelf region and the Changjiang River delta. The peat sediment submerged as the Holocene transgression came into being. The sedimentary series of sand layer, hard clay and peat in the shelf region since the late stage of Upper Pleistocene, which called "three dimension sedimentary structure", is the best records of the process of the paleo winter monsoon’s prospering and declining.更多还原