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《ACTA MINERALOGICA SINICA》 1998-01
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GEOCHEMISTRY OF ORE-FORMING FLUIDS OF CHANGKENG GOLD-SILVER DEPOSIT,GUANGDONG PROVINCE,CHINA

Zhang Sheng; Li Tongjing; Wang Liankui(Guangzhou lnstitute of Geochemistry,Chinese Academy of Sciences,Guangzhou, 510640)  
There are mainly two types of fluid inclusions,i. e.,mono-phase liquid type and liquid-dominated two-phase type,in the Changkeng gold-silver deposit,in addition to minor gas-type in-clusions coexisting with liquid-dominated-type inclusions,which reflects boiling of the ore-formingfluids- The temperatures and pressures of mineralizing fluids which are weakly acid to weakly ba-sic solutions with moderate-low salinities and relatively high densities range from 3OO'Cto 17OCand from 2O to 45 MPa, respectively. The concentration of total sulfur in the ore~forming solutionsis on the 10-5-10 -2 magnitude order, while logfo2= - 32~ - 50 and logfs2: =-1O~- 20. Themineralizing fluids are of the K-Ca-Cl type in the early stage,f ol1owed by the evolution into the Ca-Na-Cl type during the late stage,whose compositions are significantly different from those of thetypical hydrothermal solutions in modern sea floor.
【Fund】: 中国科学院黄金办科研基金;;中科院博士点基金
【CateGory Index】: P618.5
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