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.