Late Holocene Climate Change Revealed by the Magnetic Susceptibility of Paleoaeolian SandPaleosol Sedimentary Sequence in Yili Valley of Xinjiang

Key words: 
• paleosandpaleosol /
• magnetic susceptibility /
• late holocene /
• climatic change /
• Yili of Xinjiang /
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Abstract: By studying on correlation between magnetic susceptibility,TOC,CaCO3,Fe2O3 and grainsize component of 73 samples from the paleosandpaleosol sedimentary section of Xinjiang Takermohuer desert,according to OSL date,we discussed mechanism of magnetic susceptibility change and paleoclimate significance.The results were that:The correlation between χlf and percent content of 16~250 μm component was positive,coarse component percent content affected the change of χlf.In the section, χlf of paleosand is higher than χlf of paleosol,this characteristic is opposite to magnetic susceptibility of monsoon desert sediment in China.According to magnetic susceptibility and other paleoclimate indexes of section sediment,we divided 5 paleoclimate stages of study area from
3.71 ka BP:3.71~3.06 kaBP,the climate was cool and wet,from 3.06 kaBP to 2.78 kaBP was cold and dry,2.78~2.10 kaBP was cool wet,2.10~0.50 kaBP was cold and wet,0.50 kaBP to now was warm and dry.Climate change of research area is simliar to the other regiones during late holocene,and it was related to the temperature change events of surface seawater in north Alantic Ocean.The climate change was typical westerly climate model,warmdry or coolwet.