Study On Ore-forming Fluids Of Guidong Coral Tungsten Tin Deposit

The Shanhu mine in Eastern Guangxi is one of typical mineral deposits in the Nanling region tungsten-tin metallogenetic belt,since the last century,domestic and foreign scholars and researchers in the mining area has carried out a series of research work,the mineral resources exploitation of shallow has been basically finished,so in deep and periphery pros pecting of ore deposits is imminent.In this paper,based on Southwest university of Science and Technology doctoral graduate student fund project ?the Fluid Inclusions of The Shanhu Tungsten-Tin deposit in eastern Guangxi metallogenic mechanism research?,project number is 14 ZX7125.Study of ore-forming fluid mainly from two directions,one of the two directions of trace and rare earth elements analysis,dating from the side of lay particular stress on analysis methods,and the inclusion petrography observation and microscopic measuring temperature of ore-forming fluid has carried on the positive research,research and development of the ore-forming fluid of hydrothermal deposit,source of ore-forming materials,ore-forming conditions and metallogenic process provides the theoretical support,targeted for the next step prospecting.The research on coral tungsten tin deposit ore-forming fluid,the following results:1?Wolframite showed the characteristics of the relative enrichment of heavy rare earth,and the nanling region is associated with shell source granite of wolframite in tungsten-tin deposit in similar distribution pattern,and belong to shell source type granites,yantianling ridge and wolframite is europium anomalies,consistent with the shell sou rce type granite are europium anomalies,may account for the formation of wolframite ore fluid is closely related to granite rock salt ridge.Wolframite oxyphilic elements Nb and Ta content is higher,more than in the enrichment of the earth's crust,sugge sts that coral tungsten tin deposit metallogenic material mainly comes from the earth's crust,and the Y/Ho ratio is less than 28,to illustrate wolframite formed hydrothermal ore-forming carbonate ions and complex bicarbonate2?Cassiterite high content of trace elements can be characterized as high field strength elements,show that ore deposit formation process is strongly influenced by magmatism,prove that the formation of tungsten tin deposit is closely related to the magmatic activity.Yantian ridge r egion with long camp hill mining area of sericite trace rare earth elements analysis can be found that the two are characterized by relative enrichment of light rare earth,the characteristics of the heavy rare earth content is less,Gd,Dy,Er,Yb present a positive anomaly,while the adjacent elements present a negative anomaly,trace elements spider diagram is significant to the right type,both ridge rock mass on the causes of coral deposits and yantian may be closely related.The Y/Ho ratio is more than 28,sericite formation,ore-forming hydrothermal predominantly F complex system,with the first stage of mineralization of fluorite4?Quartz of fluid inclusions in quartz vein is mainly for the rich liquid two-phase inclusions??a type?.THE uniform temperature mainly between 190 ? 260 ?,The freezing point temperature mainly concentrated in-1 ^-5 ?.The salinity mainly concentrated in the 5.55 12.63 wt % Na Cl,density range is 0.758 g/cm³ 0.943 g/cm³,with an average of 0.865 g/cm³.This type of f luid inclusions in the gas phase composition is mainly water,containing a small amount of CO₂ and trace amounts of CH₄,N₂.The ore-forming fluid is the low density of the fluid medium temperature low salinity.5?By the uniform temperature-salinity scatterplot can be concluded that ore-forming process of the ore deposit in multiphase pulses metallogenic characteristics.Speculated that ore-forming material concentration is closely related to the ore-forming fluid boiling process.Linear positive correlatio n shows that the original fluid was mixed with low salinity atmospheric precipitation,this may also explain during the late stages of mineralization of ore-forming fluid mixed with a small amount of precipitation.With other vein tungsten-tin ore bed nanling metallogenic belt,high similarity,suggests that the ore-forming fluid is mainly derived from magmatic hydrothermal,metallogenic environment is relatively closed.