Because of spatial scarcity of reliable sedimentary archives,paleoclimatic history in eastern Inner Mongolia since the last interglacial remains unclear.Although extensive lakes,eolian sands,and soils within and surrounding the Hunshandake Sandy Land(HSL),located in the current northern margin of the East Asian summer monsoon (EASM),provide ideal paleoarchives for retrieving paleoenvironmental variations in the arid and semi-arid eastern Inner Mongolia,these records are commonly confined to the last deglaciation,hampering a complete understanding of the exact climatic fluctuations on glacial-interglacial time scales.Recently,we found a complete Late Pleistocene loess-paleosol sequence with a total thickness of 4.72 m in southern extremity of the HSL.This unique record provides an excellent opportunity to reconstruct regional climatic variations in the monsoonal margin.We therefore carried out detailed rock magnetic,geochemical and diffuse reflectance spectrometer analyses of this section.The 4.72 m-thick Beigou section(42.40°N,115.71°E) was sampled at 4 cm intervals,and a total of 118 bulk samples were collected.The mass-specific magnetic susceptibility (chi) was measured using an AGICO MFK 1-FB Kappabridge at frequencies of 976 Hz,3904 Hz,and 15616 Hz,respectively.Both anhysteretic remanent magnetization(ARM) and saturation isothermal remanent magnetization(SIRM) were measured using a 2G 755-4K cryogenic magnetometer.DRS were performed by a Cary 5000 UV-vis-IR spectrophotometer.Concentrations of major and trace elements were determined by PW4400 X-ray Fluorescence spectrometer and ICP-MS-PE300D,respectively.We constructed the depth-age model based on linear interpolation of three OSL dates and detailed correlations between the variations of our Rb/Sr ratio,a faithful proxy of EASM strength,with the LR04 benthic delta~(18)O stack.