| Huayangchuan Deposit is located in Hua County,Huayin city,Shaanxi Province,and belongs to the Xiaoqinling area Continental orogenic belt in the southern margin of the North China land block on the geodetic tectonics.The exposed strata in the mining area are mainly Precambrian metamorphic rocks,the exposed magma rocks are Laojunshan pluton and Huashan granite body.The mining area fault structure is developed,the ore body is mainly controlled by the Huayangchuan fault zone in the NW trending fault,and the major ore mineral in the Huayangchuan deposit is niobium titanium uranium ore and galena.Based on the study of geological characteristics and mineralogical characteristics of the deposit,Research on isotope geochemistry study of trace elements in the surrounding rock and different ore minerals and gangue mineral of the deposit is carried out in this paper,and the following new understanding and results have been obtained:(1)Huayangchuan deposit is a U-Nb-Pb-REE polymetallic deposit,mineral composition is very complex,appraisal and electron microprobe analyses of the rock ore shows that the main ore minerals of Huayangchuan polymetallic deposit are niobium ampangabeite and galena,in addition to crystalline uranium ore,galena,uranothorite,changbaiite,monazite,sphenite,barite,zircon,celestine and strontianite,The ore minerals containing uranium,thorium,rare earth metal,Sr-Ba and other metallogenic elements,such as brown curtain stone,and gangue minerals are composed of feldspar,quartz,calcite,mica,aegirine augite and other minerals.(2)The ore types of Huayangchuan deposit can be divided into three categories of uranium-niobium ore,blanch ore and uranium-niobium-Pb mixed ore.The ore the texture and structure of ores has granular structure,ring structure,containing structure and replacement-corrosion texture,and the ore structure has star-point dispersion,irregular mass structure,dipping structure,sparse speckle structure,mesh vein structure,sparse mass block,fine vein structure and stripe structure.(3)The average Si O2 content analysis is 69.44% of granite in the mining area emergence in Huayangchuan deposit;Al2O3 mean value of granite is 15.61%;the mean value of total alkali(Na2O+K2O)is 8.33%;Na2O mean 4.7%;the mean value of the(?)value is 2.63,which belongs to calcium alkaline;A/CNK is 1.43,and the alkalinity rate index(AR)mean is 2.70.According to the illustrations of granite AR-Si O2,K2 O and Si O2,A/CNK-A/NK and Ti O2-Si O2,the granite of this deposit is alkaline,high potassium calcium alkaline series and aluminum "I" type granite.(4)The metallogenic elements of U,Nb and Pb are obviously enriched in the ore-bearing surrounding rocks(metamorphic rocks and granite)exposed in Huayangchuan uranium niobium lead mine,which indicates that the ore-bearing surrounding rock in the mining area has the material basis as the ore-source rock of the deposit.(5)Quartz is one of the main gangue minerals in the deposit,because trace elements are difficult to enter the quartz lattice with the same image,so the trace elements in quartz he reflects the characteristics of trace elements in metallogenic fluids.Quartz in the enrichment of B,As,Rb,Sr,Ba,Pb,Bi,U and other trace elements,of which the main metallogenic elements U and Sn,Sb,Nb,Ta,Hf,Co,Ni,Cr correlation are better,showing obvious positive correlation,of which Nb,Ta,Zr,Hf and other high field strength elements,Sc,Co,Ni,Cr and V are pro-magmatic elements,so the positive correlation between U and them indicates that uranium mineralization is closely related to magmatic activity,and more deep fluid is involved in the uranium mineralization process.(6)Calcite is also the main gangue mineral in the deposit,calcite enrichment Be,Mn,As,Se,Sr,Cd,Ba,W,Pb,Bi,U and other trace elements,calcite trace elements on the one hand from the mineral fluid inclusions,on the other hand,from the Ca elements of the same image(such as Sr,Ba and other elements).The analysis of trace element characteristics and correlation of calcite shows that the metallogenic minerals of calcite are not a single source and the metallogenic fluid is a reductive fluid.(7)Barite is obviously enriched with Be,As,Sr,Pb,Bi,W,U and other elements,barite trace elements on the one hand from the mineral fluid inclusions,on the other hand from the Ba elements of the same kind of image(such as Sr element).(8)The characteristics of trace elements in Galena and pyrite show that the Galena is the genetic type of magmatic hydrothermal genesis,the product of the early stage of magma action,the fluid forming galena is a fluid with high temperature reduction,live in the oxygen-deprived environments,the metallogenic fluid is mainly rich Cl-,and the mineralization has the characteristics of crust and mantle mixing.The trace elements of pyrite indicate that the formation temperature of pyrite is higher,the fluid oxygen degree is higher,and it is in the environment of relative reduction,and the overall performance is the genetic characteristics of hydrothermal fluid.Both Co and Ni show a large range of changes,suggesting the multi-source nature of pyrite material and the characteristics of shell and mantle mixing. |
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