Physical-Chemical Conditional Evolution of Ore-forming Fluid in the Damoqujia Gold Deposit in Jiaodong Peninsula

Abstract

Abstract:

In the Damoqujia gold deposit, fluid inclusions can be divided into three types, namely aqueous inclusion, CO₂-rich inclusion and brine inclusion. The former two types dominate, while the last one is rare. For aqueous inclusions, the homogenization temperatures vary from 98 ℃ to 376 ℃ with salinities varying from 0.53% to 8.28 % and the homogenization pressures are below 50×105 Pa. For CO₂-rich inclusions, the whole homogenization temperatures range from 255 ℃ to 348 ℃ with salinities varying from 2.42% to 11.43% and homogenization pressures are from 1,000×10⁵Pa to 2,500×10⁵Pa; the CO₂homogenization temperatures vary from 23.0 ℃ to 32.4 ℃ which indicates the existence of CH₄ or H₂S. The oreforming depth was estimated at about 1 km, based on homogenization temperatures of pure CO₂ inclusions assuming hydrostatic pressure. At about 270 ℃, the homogenization pressures decrease rapidly, indicating that the fluid system experienced a decompression boiling process near 270 ℃; at the same time, the salinity and density of ore fluid varied remarkably. Therefore, it is proposed that decompression boiling and related ore fluid dramatic change in physical and chemical properties are responsible for gold deposition in Damoqujia.

Key words: gold deposit, Damoqujia, fluid inclusion, decompression boiling, physical-chemical evolution

CLC Number:

P618.1

GUO Chun-Ying GAO Bang-Fei ZHANG Jing WANG Qiang-Fei GONG Qiang-Jie XU Hai-Jun. Physical-Chemical Conditional Evolution of Ore-forming Fluid in the Damoqujia Gold Deposit in Jiaodong Peninsula[J]. Geoscience, 2008, 22(5): 743-750.

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Physical-Chemical Conditional Evolution of Ore-forming Fluid in the Damoqujia Gold Deposit in Jiaodong Peninsula

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