WU Li-jie, SHI Jian-sheng, GUO Jiao, WANG Cheng-min, BI Zhi-wei, DONG Qiu-yao, CHEN Hong-yun

The Institute of Hydrogeology and Environmental Geology, CAGS, Shijiazhuang 050061, China

Abstract: On the basis of geochemical characteristics of 20 kinds of trace elements in the Yangqiaopan section of the desert-loess transitional zone, chronology, and literature researches, we discussed climate changes in the Yangqiaoban area since 13.0ka B.P. and came to the following conclusions: the strata distribution of trace elements with high consistency composition in the Yangqiaopan section was obvious; Cr, Cs, Co, Cu, Mn, and I can be used as paleoclimate proxies for the strength change of the East Asian summer monsoon. The climate change revealed by the characteristics of main trace elements could be divided into five stages: the climate was very dry and cold during 13.0~11.7ka B.P.; the climate was slightly warm and dry during 11.7~10.0ka B.P.; the climate was mild and wet during 10.0~6.4ka B.P.; the climate became slightly cold and dry again during 6.4~1.60ka B.P.; the climate was then cold and dry since 1.60ka B.P., and the cold/warm climates alternated frequently.

Keywords: geochemistry east Asian monsoon magnetic susceptibility weathering and pedogenesis Mu Us Desert

*Corresponding Author, E-Mail: ihegwulijie@163.com

Bulletin of Mineralogy, Petrology and Geochemistry Vol. 34, No.2, 2015, page 323-329