The Geochemistry Of Zha Ertaishan Group In The Middle Part Of Inner Mongolia And The Elements' Direction Of Uranium Mineralization

Zha Ertaishan group, a sedimentation rift valley of proterozoic era,lying in the North China Platform, is made up of a clastic rock-carbonate-clastic rock construction.From bottom to top it consists of Shu jigou group,Zheng longchang group,A gulugou group,Liu hongwan group. Zha Ertai group is one of a most important concentrating mineral stratum in our country.There are many large and over-large sale Copper,Leading,Zinc polymetallic sulfide deposits,it is also an important uranium layer.This article mainly regards Zha Ertaishan group in Inner Mongolia as a central object of study,it is compared four groups with the trace elements and rare earth elements,using geochemical theory,methods and software for mapping to compare the geochemical characteristics of each group with similarities and differences,and the article tries to explore the source characteristics and environmental characteristics of ancient from the enrichment and migration of elements; Combining the characteristics of 601 Uranium ore-spot, focal point of the work is the contrast of non-ore spot, synthesize the research for the source of ore-forming fluids and the role of the element uranium instructions. Draw the following conclusions:1) In tatol view of the Zha Eertai shan group,the content of each trace elements is related with lithology.The enriched trace elements include W,Re,Pb,Sb,Ba,Hf,Ta, the deficient of the trace elements include Ni,Cu,Sr,Nb,In. specially,Zheng longchang group is most deficient of the trace elements, clastic rock of Shu jigou group and Liu hongwan group takes second place,the most enriched trace elements is A gulugou group's carbonaceous slate.2) A gulugou group is a very important ore formation stratum of Precambrian, it births Cu,Pb,Zn,Au,U and so on.Therefore, the research group is the most important task. The ancient environment of indicators can be derived by the following:Due toδU=2U/(U+Th/3) greater than 1 and w (V)/ w (V+Ni) obtained in a reducing environment of this group.Input the samples of A gulugou group to the w(Zn)-w(Co)-w(Ni) ternary diagram,most are near the seabed hydrothermal area,it indicates that most area of A gulugou group is influenced by deposition of water.3) There is a large range ofΣREE of Zha etaishan group, distribution patterns of rare earth is the enrichment of LREE,and the deficient of HREE, the rare earth elements content varies with the lithology.With the input the samples of w(La) /w(Yb) -w(ΣREE),it indicates that the source of A gulugou group is different from other groups.4)601 uranium deposit lies in the A gulugou group of Zha ertaishan group, the uranium mineralization is closely related with the iron cap,with the separation of Th,U.The rare earth elements are with big change between carbonaceous slate and veins, it indicates that there is a composition redistribution during the mineralization period.5)Through the correlation analysis,the element U is closely linked with W,Re,Mo,Ta both 601 uranium deposit and non-ore spot,it is possible that the ore-forming fluids originated from mantle; in conclusion,Fe,Pb,Cd,Re,Ni give certain direction on the role of U mineralization.