腾格里沙漠西北缘青土湖晚第四纪孢粉组合特征与环境变迁  

Sporopollen assemblages and climate changes since the Late Quaternary at Qingtu Lake in northwestern margin of Tengger Desert

作　　者：王丽媛[1] 辛蔚[1] 程捷[1] 

机构地区：[1]中国地质大学(北京)地球科学与资源学院,北京100083

出　　处：《古地理学报》2014年第2期239-248,共10页Journal of Palaeogeography：Chinese Edition

基　　金："内蒙古1︰25万哈日敖包布格;乌力吉;达里克庙幅区调修测"项目(编号:1212011120706)资助

摘　　要：根据腾格里沙漠西北缘青土湖ZK1孔晚第四纪以来沉积物孢粉组合、磁化率特征和光释光年代的研究,恢复了该区的植被面貌,论述了青土湖地区自中更新世晚期以来的气候变迁特征。研究结果表明,该地区中更新世晚期可划分为凉干和暖湿2个阶段;晚更新世可划分为暖湿和凉干2个阶段,并且与深海氧同位素曲线反映的末次间冰期、末次冰期的次一级气候旋回特征相吻合;全新世该地区主要经历了从暖湿到凉干的气候波动。Based on the analyses of sporopollen assemblages, magnetic susceptibility, OSL dating of lake sediments from borehole ZK1 in Qingtu Lake, northwestern margin of the Tengger Desert, this paper reconstructs the vegetation features of each stage, discusses the vegetation assemblages and lake climate changes since the late Middle Pleistocene. It is indicated that Qingtu Lake experienced two stages of cli- mate changes, dry-cold and warm-wet in the Middle Pleistocene, and warm-wet and dry-cold in the Late Pleistocene. Moreover, it is accorded with climate cycle characteristics of the last glaciation and the last interglacial in MIS. Meanwhile, Qingtu Lake experienced the evolutions of climate of the dry-cold and warm-wet in the Holocene.

关 键 词：孢粉组合 气候变迁 晚第四纪 腾格里沙漠 

分 类 号：P532[天文地球—古生物学与地层学] Q913.84[天文地球—地质学]