内蒙古扎鲁特旗地区更新统沉积特征及气候环境演变

内蒙古扎鲁特旗处于东亚季风区的东北缘，对季风强弱以及全球气候变化影响敏感.本文以扎鲁特旗地区的更新统赤峰黄土与乌尔吉组作为研究对象，采用实测剖面中沉积物常量元素、微量元素、粒度、碳酸盐、磁化率、孢粉、光释光等指标分析研究了该地区气候环境变化.研究表明，研究区光释光测年结果为（130.8±6.1）～（38.7±1.7） ka，赤峰黄土的气候环境以温暖湿润草原植被景观为主，底部和顶部出现较短暂的寒冷干燥的疏林草原植被景观；乌尔吉组气候环境变化总体表现为凉爽干燥荒漠草原－草原植被景观.

PLEISTOCENE SEDIMENT CHARACTERISTICS AND CLIMATIC ENVIRONMENT EVOLUTION IN JARUD QI,INNER MONGOLIA

The Jarud Qi of Inner Mongolia, located in the northeastern margin of East Asian monsoon region, is sensitive to monsoon intensity and global climate change. Taking the Pleistocene Chifeng loess and Wuerji Formation in the area as the research object, the paper studies the climatic environment changes based on the indexes such as major and trace elements, particle size, carbonate content, magnetic susceptibility, sporopollen and OSL dating of surveyed sections. The results show that, during 130.8±6.1 ka to 387.7±1.7 ka, the climatic environment of Chifeng loess is dominated by warm and humid grassland vegetation landscape, with short cold-dry sparse forest and grassland vegetation at the bottom and top, while that of Wuerji Formation is generally cool and dry desert steppe-steppe vegetation.