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Studies On The Ore-forming Fluid Of The Dongguashan Copper Deposit In Tongling Area, Anhui Province

Posted on:2013-10-22Degree:MasterType:Thesis
Country:ChinaCandidate:Z W GaoFull Text:PDF
GTID:2230330371482478Subject:Mineralogy, petrology, ore deposits
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Tongling area in Anhui Province is an important part of the Middle-lowerYangtze River polymetallic metallogenic belt. Dongguashan copper deposit is one ofrepresentative stratabound skarn Cu deposits in Tongling, Anhui Province. It is typicaldue to its large scale, high grade and remarkable geologic feature. A detailed study hasbeen carried out on the fluid inclusions in the Dongguashan copper deposit, with afocus on the origin of the deposit.The following are major achievements obtained in this thesis.1. The petrographical study shows that there are many kinds of fluid inclusions,but the main types are liquid-rich and daughter mineral-bearing ones.2. The geochemical study of fluid inclusions indicates that the ore-forming fluidsmostly belong to NaCl-H2O system,the homogenization temperatures, densities andhomogenization pressure of the ore-forming fluids are defined mainly in the ranges of206.1~577.7℃,0.53~1.16g/cm3, and58.7~395.3×105Pa, respectively,indicating formation of the Dongguashan copper deposit mainly in the hightemperature and low pressure environment.3. From early to late, the number of liquid-rich inclusions increases withdecreasing in homogenization temperature, salinity and homogenization pressure,and an evident increasing in density occurs. The data mentioned above suggestmineralization in the Dongguashan copper deposit might be mainly affected bytemperature, salinity, and Cl-concentration. The ore-forming fluid with hightemperature and high salinity at the stages of skarnization and early mineralization issimple in composition, indicating its origin of magmatic evolution. In contrast withthis, The ore-forming fluid having two ends with high salinity and low salinity at thestage of the main mineralization has the similar homogenization temperature andsalinity,which indicates the boiling of the ore-forming fluids.4. The ore-forming elements of Dongguashan copper deposit is moved in theshape of complex compound, the main cause of metallogenic material precipitationmay be the boiling of the ore-forming fluids.
Keywords/Search Tags:fluid inclusion, skarn, copper deposit, fluid evolution, Tongling areain Anhui Province
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