干旱区生态环境知识资源中心

To investigate the pateo-environment significance of anisotropy of magnetic susceptibility (AMS) parameters in loess-paleosol sediment, we report our recent study on a loess profile in northeastern flank of Qilan Mountains, China. Our data suggest the major magnetic minerals in our section are magnetite, maghemite and hematite. Different from the central loess plateau of China., the magnetic susceptibility (MS) works not well in this semi arid region. Surprisingly, the parameters of AMS are more sensitive to the environment change than the magnetic susceptibility. We also found well agreement between these parameters and median grain size that suggests parameters of AMS may potentially a new East Asian winter monsoon proxy. Some important global/regional climate change events, especially cold/arid events, such as cold stage of MIS16 and dry event nearly 250Ka, also recorded in our AMS parameters variation.