Grain size characteristics and sedimentary environment of Cele Gobi sediments in Xinjiang
[Objective]To reveal the grain size characteristics and sedimentary environment of sedi-ments in Cele Gobi in Xinjiang,and to provide theoretical basis and scientific support for the release of sedi-mentary dust,the evolution of sedimentary environment,the rational use of land resources and the reduction of dust disasters.[Method]Taking Cele Gobi in Xinjiang as the research area,the grain size distribution characteristics and sedimentary environment of sediments were analyzed by field investigation,particle size and magnetic susceptibility study.[Result]The gobi surface of 0～2 cm sediment under the influence of wind erosion and dust is larger,surface sediment content of coarser grained as lower altitudes shows a gradu-ally increasing trend,2～40,40～80 cm depth sediment by flood is larger,the effect of the total sediment is relatively coarse grained content as the tendency of increase with the lower altitudes showed reduced after.The frequency curves of sediment particle size distribution in each gobi section and each depth are mostly bi-modal curves,indicating that the sediment source is multi-source,and the saltation component is the abso-lutely dominant particle size composition,the average content of saltation is 49.43%.With the decrease in altitude,the average particle size of sediments in the gobi sections first became fine and then coarse,with the average particle size ranging from 56.08 µm to 139.71 µm.Except for section 2,all other sections belong to differential sorting,with negative skewness and very negative skewness,and narrow or very narrow peak state.The magnetic susceptibility of the sediments at 0～2 cm depth was strongly affected by wind erosion and dust fall,which was significantly higher than that of the underlying sediments.The sediments at 2～40 cm depth and 40～80 cm depth may have been deposited at the same time,and the sedimentary environ-ment and sedimentary dynamics were the same.[Conclusion]Wind erosion and dust fall are the main causes of the 0～2 cm sediments in the surface layer of the Cele Gobi in Xinjiang,and the sedimentary envi-ronment is mainly hydrogenic sedimentary environment.
NETL
NSTL
万方数据
维普
