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Volume 16 Issue 2
Jun 2005
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Zhenliang Zhang, Zhilong Huang, Bing Rao, Tao Guan, Zaifei Yan. Concentration Mechanism of Ore-Forming Fluid in Huize Lead-Zinc Deposits, Yunnan Province. Journal of Earth Science, 2005, 16(2): 152-159.
Citation: Zhenliang Zhang, Zhilong Huang, Bing Rao, Tao Guan, Zaifei Yan. Concentration Mechanism of Ore-Forming Fluid in Huize Lead-Zinc Deposits, Yunnan Province. Journal of Earth Science, 2005, 16(2): 152-159.

Concentration Mechanism of Ore-Forming Fluid in Huize Lead-Zinc Deposits, Yunnan Province

Funds:

the National Natural Science Foundation of China 40172038

the Collaboration Program sponsored by the Colleges and Universities of Yunnan Province 2000YK-04

the Major State Basic Research Program of China G1999043203

  • Received Date: 28 Dec 2004
  • Accepted Date: 30 Mar 2005
  • The Huize Pb-Zn deposits of Yunnan Province,located in the south-central part of the Sichuan-Yunnan-Guizhou (SYG) Pb-Zn multimetal mineralization district (MMD),are strictly controlled by fault zones. The sources of ore-forming fluid in the deposits have been debated for a long time. Calcite,a gangue mineral,has uniform C and O isotopes. The δ13CPDB and δ18OSMOW values vary respectively from -2.1×10-3 to -3.5×10-3 (mean -2.8×10-3) and 16.7×10-3-18.6×10-3 (mean 17.7×10-3). No obvious difference can be found in C and O isotopes among occurrences and elevations and even ore-bodies. Types of inclusions include those of pure liquid (L),liquid-rich gas-liquid (L+V),and three-phase ones containing a daughter mineral (S+L+V) and immiscible CO2 with three-phases (VCO2+LCO2+LH2O). Their homogenization temperatures vary from 110 to 400 ℃,and two peaks are shown. (87Sr/86Sr)0 ratios of calcite in the deposits are higher than those in the mantle and Emeishan basalts,and slightly higher than those in the Baizuo Formation,which the Huize lead-zinc deposits are found in. All of the (87Sr/86Sr)0 are low relative to those in the basement rocks. Fractionation of Sr isotope did not occur in the ore-forming fluid during the precipitation of minerals. The results indicate that the ore-forming fluid is homogeneous and derived from the mixing of different fluids. Gas-liquid inclusions can be separated into two groups in 300-400 ℃ with a salinity of 5%-6% and 12%-16% NaCl respectively. However,the salinities of inclusions vary from 7% to 23% NaCl in 100-300 ℃,especially in 150-250 ℃. The formation pressures of faulted zones are (50-320)×105 Pa. The estimated pressures of the overlying rocks on the ore bodies are 574×105-640×105 Pa. The pressures of ore-forming processes would be 145×105 to 754×105 Pa. Therefore,pressure sharply reduced and boiling occurred when the ore-forming fluid flew into the fault zones. As a result,the ore-forming fluid was highly concentrated,and metallic minerals began to precipitate from the fluid on a great scale. The high-grade lead-zinc deposits were formed when the fluid was under saturation or over-saturation conditions.

     

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