<正>The elimination of grain size''''s effect is vital to analyze the chemical weathering history of eolian dep...
Xiaoguang Qin~*,Yan Mu~1 Key Laboratory of Cenozoic Geology and Environment,Institute of Geology and Geophysics,Chinese Academy of Sciences,No.19 Beitucheng Xi Rd.,Beijing 100029,China
Holocene palaeoweathering conditions and environmental changes of Loulan （楼兰） Stupa Sec-tion were reconstructed by major elements analysis results and optical stimulated luminescence dating results. Major element results show source rock change little, with the composition equivalent to granodiorite. The low R value and high CIA （chemical index of alteration） value indicating the section at primary weathering phases. The muddy silt and silty clay have low R value and high CIA value and total iron content. In contrast, the sandy clay silt and sandy silt have high R value and low CIA and total iron value. Deglaciation time climate was relatively humid. In comparison to previous and posterior hiatus, the Middle-Holocene climate was relatively wet but still displayed high-frequency and high-amplitude fluctuations.
