延怀盆地晚更新世中晚期湖泊发育与气候变化

摘要

There was lake development during late Pleistocene in the Yanhuaibasin. On the basis of the results of sporopollen sample ananlyses for four profiles of the middle and late times of late Pleistocene in the basin, combined with dating of the lacustrine stratum and the stages of lake development, we have restored the paleoclimatic environment during 55～26ka B.P. and 20～8ka B.P., during which the second and the third period lacustrine stratum developed. The lake sediment of the middle and late time of late Pleistocene reflects a wet climatic characteristic of the Yanhuai basin.%延怀盆地晚更新世发育湖相沉积。根据4个中晚期湖相层剖面的孢粉分析鉴定结果，结合区内晚更新世湖相层的年代测定及湖泊发育的分期，恢复了发育于55～26和20～8kaB.P.时间段内的第2，3期湖泊发育期间的古气候环境。延怀盆地晚更新世中晚期湖泊沉积反映了潮湿气候的特征。