| The weng kong lead-zinc polymetallic ore of Zhenkang is located in the southern section of the Sanjiang metallogenic belt,The area produces a large number of lead-zinc polymetallic deposits,which is produced in the Upper Cambrian formation in the layered,vein lead-zinc deposit is an important type.In recent years,more geologists have studied the area and get a lot of knowledge.However,there are few studies on its mechanism,especially the role of ore-forming fluid,ore-forming material sources.The weng kong lead-zinc deposit is found in recent years at the Yunnan Province of the west,Its produced in the Baoshan group of sericite mud slate and marble limestone,which is a vein-like lead-zinc deposit in the north-west steeply inclined crushing zone,a plurality of substantially parallel ore composition,it is ideal to study the ore-forming fluid and the source of ore-forming material.The No.4 orebody is the main research object in this paper,analysis of characteristics of the fluid deposit and mineral source,and then explore its causes,and found of mineralization model at the preliminary.This paper concluded the following understanding:(1)The weng kong lead-zinc deposit is located in the southern part of the Baoshan block,The ore body is irregularly layered,and the vein is produced in the fault zone and interlayer fracture zone of the Siluran mudstone slate and the marbleized limestone in the Upper Cambrian Baoshan Formation,The boundary between the ore body and the surrounding rock is clear.(2)This study show about REE and trace element studies of ore and surrounding rock:Ore trace elements are similar,it may be the same period under the same mineralization products;Ore and surrounding rock Rare earth element distribution pattern shows a low angle to the right tilt tends to flat curve(Knock>Kore),it is presumed that the ore-forming material comes from the surrounding rock(the Cambrian strata),the main source of ore-forming material may be hydrothermal after magmatic period.(3)This study show about the isotope geochemistry of deposit:The ore-forming fluid is a crust-mantle mixed fluid,where the source of the shell may be provided by the Cambrian carbonate formation in the mining area,and mantle source components may be associated with the area of hidden rock.(4)The type of fluid encapsulation is mainly gas-liquid two-phase aqueous inclusions(LH2O+VH2O),the inclusions are mostly clustered in clusters,mainly to the original inclusions,secondary inclusions are small,the secondary inclusions are mostly linear,the fluid inclusions are uniformly distributed in the range of 200?240?,belong to the low temperature deposits,ore-forming fluid salinity is 0.7wt%?10wt%NaCl,Ore-forming fluid density is 0.7?0.9g/cm,ore-forming fluid pressure is 39-66.2MPa.Laser Raman results show that the main component of fluid inclusions is H2O.The ore-forming fluids behave the medium-low temperature,low salinity,low density characteristic.(5)The weng kong lead-zinc deposit should be hydrothermal filled lead-zinc deposits.Deposit should be formed in the various geological processes at the specific geological environment,but also is the result of the upper crust evolution. |
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