| Woxi Au-Sb-W Deposit is located in the west of Hunan Province,Which is also located in turning parts of xuefeng arcuate structural belt.The deposit is located in SLATE of madiyi fm of late proterozoic group,Which is controlled by the structure and formation.The deposit is famous for achieving industrial grade,respectively,of both gold,antimony and tungsten,Which is one of famous large Au-Sb-W deposits in our country.The ore bodies are divided into layered orebodies and veins.The main ore minerals are natural gold,antimony and white tungsten,and the types of surrounding rocks are mainly discoloration,pyrite and silication.On the basis of previous studies,this paper studies the metallogenic fluid by using the method of fluid inclusion.Through gathering the different stages of quartz,scheelite and calcite samples to making indoor observation,description,test and calculation,and mak ing the following conclusions:The fluid inclusion consists mainly of H2O inclusion and CO2-H2O inclusion,and is mainly composed of H2O inclusion.Mineralization mainly includes four phases,the first phase of the uniform temperature range is 117185?,the average of 157.6?,the ore-forming temperature between 173214?,salinity values between 3.856.52wt%Na C l,with a mean of 5.25 wt%Na C l,p H value of 5.74,showing a weak alkaline,Eh value is 0.0578,show the weak reducibility,f O2 value of 10-50.84,f CO2 value of 3.202,f S2 value of 10-13.35.The second phase of uniform temperature range is 120182?,the average of 157.5?,the ore-forming temperature between 185210?,salinity values between 1.247.14 wt%Na Cl,with a mean of 4.95 wt%Na C l,p H value of 5.73,showing a weak alkaline,Eh value is 0.0775,show the weak reducibility,f O2 value of10-50.66,f CO2 value of 2.687,f S2 value of 10-13.36.In the third phase of a uniform temperature range is 125170?,the average of 150.0?,the mineralization temperature is between 183201?,salinity values between 3.536.17 wt%Na Cl,with a mean of 4.66 wt%Na Cl,p H value of 5.73,showing a weak alkaline,Eh value is0.0596,show the weak reducibility,f O2 value of 10-51.47,f CO2 value of 3.521,f S2 value of10-13.55;The fourth stage of uniform temperature range is 95153?,the average of132.6?,metallogenic temperature range between 162186?,p H value of 5.73,showing a weak alkaline,Eh value is 0.073,showing weak reducibility,f O2 value of10-54.23,f CO2 value of 3.609,f S2 value of 10-14.05.The average is 391.6 bar,and the corresponding mineralization depth is 1.111.91 km,with the average of 293.1-505.8bar.The density value of the metallogenic fluid was 0.936-0.982 g/cm3,and there was no significant change in the mineralization stage density.Isotopic evidence indicates that the mineral comes from a shell source,possibly from deep basement rock.Dielectric water is derived from the mixing of metamorphic water and atmospheric precipitation.It is mainly carried out in the form of the Au?HS?-2,which is mainly carried out in the form of the sulfur-complex HSb2S-4which is mainly carried out in the form of WO2-4 and HWO-4.The mechanism of deposit of gold,antimony and tungsten is reduced by temperature. |
PDF Full Text Request