Characteristics Of Grain-size, Element Geochemistry Of Quaternary Aeolian-Dust Deposits In The North Of Jiangxi Province And Its Implication For Material Resources

The Quaternary is an important era of changes in the Earth's climate and environment.During this period,the climate and environment have changed in the marshes.Aeolian sand-aeolian dust accumulation is an important and far-reaching research direction,it can compare to the deep-sea sedimention and ice core research.Aeolian sand-aeolian dust accumulation refer to many aspects,include loess distribution,material source,transmission power,the construction of high-resolution climate and environment record.Searching material source and expounding the formation or release mode of dust are of great significant for reestablishing ancient atmosphere circulation,it is the focus and difficult problem of loess research.There are many studies on laterite,loess in this area,but there are divergent views on its material sources.In this paper,based on the long – term field geological surveying,six laterite-loess accumulated sections which Suspected of eolian dus accumulating were selected.This paper described the geochemical characteristics of granularity and elements of each section.The research combine the data above and preliminary ptudy—standard model of monophyletic species aeolian sand-aeolian dust accumulation system—to vetify the space relation of sediments and their potential source area.1)The granularity components of quartz and grain size analysis revealed the aeolian attributes of each section in the study area.We can found from the three-component diagram of quartz and total bulk granularity,the sample points showed a gradual upward trend,and there was no significant difference between each section,it is the unique trend of the eolian deposits into the performance.Each section showed obvious space difference,but it followed the same law on grain-size components.2)The elemental analysis showed that the overall average content of SiO2?Al2O3? Fe2O3 of each section was higher than 79%,it shows the phenomenon of silica-rich aluminum,and indicated the warmth of the depositional environment;The standard diagram of the main elements and the vertical variation of the sections instructed weathering intensity declined from strong to weak followed by WJ>TT>STF>SLH>HXC>BTS>YZJ3)The standard model of monophyletic species aeolian sand-aeolian dust accumulation system showed that the fractionation of grain size and elemental analysis are similar to the standard model.It realed that each section is a node of aeolian sand-aeolian dust accumulation system.Based on the sand-silt-clay triangular diagram,this paper inferred that SLH,HXC,STF are closer to their potential source area and WJ,BTS,TTare far from their potential source area.