Chronosequence of Loess Section and Evolution of Pedogenic Environment in Western Guanzhong Basin

The sedimentary chronosequence of Jiangyaocun(JYC)loess section was made by application of optically stimulated luminescence(OSL)dating techniques.Combination of sedimentary characteristics and measurements of other indicators,the paper has explored the evolution of pedogenic environment since the last deglaciation in this area.During the period of 16.66-13.16 ka,the pedogenesis was weak,which caused by the arid climate and larger amount of dust input.During the period of 13.18-8.31 ka,the climate became warming and wetting in the eolian deposits area,and the amount of dust input was smallest,but pedogenesis was still weak because vegetation was not fully recovered.During the period of 8.31-3.24 ka,there was an important pedogenic period due to the humid climate and smaller amount of dust input,and the amount of dust input was increase and pedogenesis was weaken due to significant trend of drought during the 6.19-5.77 ka and 3.78-3.24 ka.The amount of dust input was increase and pedogenesis weaken again originated from a significant trend of drought since 3.24 ka.