腾格里沙漠西北缘青土湖中更新世晚期以来沉积环境变迁  

Changes of Sedimentary Environment Since Late Middle Pleistocene of Qingtu Lake in Northwestern Margin of Tengger Desert

作　　者：王丽媛[1] 程捷[1] 辛蔚[1] 昝立宏[1] 

机构地区：[1]中国地质大学地球科学与资源学院,北京100083

出　　处：《现代地质》2013年第4期949-958,共10页Geoscience

基　　金：中国地质调查局项目"内蒙古1:25万哈日敖包布格;乌力吉;达里克庙幅区调修测"(1212011120706)

摘　　要：以腾格里沙漠西北缘青土湖钻孔ZK1为研究对象,通过对钻孔沉积物的光释光年代、粒度、磁化率等研究,揭示了该湖泊自中更新世晚期以来的环境变迁。研究结果表明:该地区中更新世晚期经历了干冷→暖湿两个阶段,晚更新世经历了湿暖→干冷两个阶段,与深海氧同位素的末次间冰期、末次冰期气候旋回特征吻合,全新世主要经历了干冷→暖湿的气候波动。反映了腾格里沙漠西北缘晚第四纪的气候波动变化特征,特别是为本区中更新世晚期以来的气候环境变化的研究提供了依据。Based on the analyses of sediment,OSL dating,grain size,magnetic susceptibility of lake sediments from core ZK1 in Qingtu Lake,the northwestern margin of Tengger desert,this paper reconstructs the history of lake evolution since late Middle Pleistocene. The results indicate that Qingtu Lake experienced dry-cold and warm-wet climates in Middle Pleistocene,warm-wet and dry-cold climates in Late Pleistocene,which is accorded with climate cycle characteristics of the last glaciation and last interglaciation in MIS. Meanwhile,Qingtu Lake experienced the evolutions of the dry-cold and warm-wet climate in the Holocene. Therefore,this study reflects the evolutions of climate in the northwestern margin of Tengger desert during Late Quaternary and provides the basis for Qingtu Lake’s climatic and environmental evolutions since late Middle Pleistocene.

关 键 词：青土湖 中更新世晚期 粒度分析 沉积环境变迁 光释光(OSL)测年 腾格里沙漠西北缘 

分 类 号：P534.63[天文地球—第四纪地质学]