The Characteristics Of Stable Isotope In Surface Sediment Of Six Deserts (Sandy Land) In China

The northern areas of China,suffering air quality decline and certain economic losses in spring and winter.At present,the monitoring,tracing,evaluation and health management of sand dust storm had being intensive studied.And had already straighten up the basic problems such as the source area,transmission path and so on.There have some scholars using Radioactive isotope,zircon,mineral composition,rare earth elements and trace elements to discusse distribution level,feature of combination and the surface of particles that from different latitudes,But there had few scholar to study the surface characteristics of the dust storm source region by using the stable isotope,Moreover,these studies are often limited to a small scale.Large scale comprehensive comparative analysis on sand dust source area or the key areas are lacked.In this paper,and we used stable isotope and constant elements as the technical means to comprehensive comparison analysis of the above regions of the surface particle,surface major element characteristics and surface evolution,weathering characteristics,discussed the source of surface material and the source of sand dust storm in the desert?sand land?.In this paper,we select the six major desert?sandy land?in the main dust storm source area in China including Mu Us sandy land?Taklimakan desert ?Qaidam basin desert?Kum Tagg desert?Ulanbuh desert and Tengeryn desert as study area.Sampling in the upper part of the non vegetation area in the moving sand dune and sand dune.Two stable isotope values of ¹⁸O and ³⁰Si were analyzed by isotope mass spectrometry.Na,K,Ca,Mg,Al,Fe were analyzed by ion emission spectrometer.Determination of Si content by volumetric method.And then through the statistical analysis,the main results are as follows:The results show that ¹⁸O and ³⁰Si'? range from 9.6¹4.8 and-1.7⁰.3 in 22 samples.Among this,the value of ¹⁸O'? from Kum Tagg desert is the maximum,Qaidam basin desert is the minimum.for the value of ³⁰Si,and the Mu Us sandy land is the maximum,Qaidam basin desert is the minimum.Overall,the coefficient of variation value of ³⁰Si'? are greater than the coefficient of variation value of ¹⁸O'?.And ³⁰Si is more suitable for dust source research.Furthermore,the adjacent desert?sandy land?showed asimilar trend of ³⁰Si,Therefore,it is inferred that the adjacent desert?sandy land?may come from the same area.We had analyzed seven major elements?including Na?K?Ca?Mg?Al?Fe?Si?,The results show that the variation coefficient of Mg and Ca is the largest in the all samples.Weathering characteristics analysis found that the above regions are in the primary stage of weathering which in striping Na,Ca phase,According to the degree of weathering,it can be divided into three regions:?1?Mu Us sandy land.?2?Taklimakan desert and Qaidam basin desert.?3?Kum Tagg desert?Ulanbuh desert ?Tengeryn desert.Under similar external conditions,the most important reason for this difference is the difference of the parent rock,and the weathering degree is also increasing.Comprehensive consideration the above result,we found that There are great differences in the characteristics of the surface particles in the six major deserts?sandy land?,Generally speaking,the surface material of the six major deserts?sandy land?can be divided into three regions: Mu Us sandy land;Taklimakan desert and Qaidam basin desert;Kum Tagg desert?Ulanbuh desert ?Tengeryn desert.These results are related to the continental plate.we preliminary infer that the reason.of forming the different levels is the difference between the parent rock and the original rock.