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Xiaofeng Cao, China university of Geosciences(Wuhan) (China)
Xinbiao Lv, China university of Geosciences(Wuhan) (China)
Fang Li, China university of Geosciences(Wuhan) (China)
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The major objectives of this paper are to analyze fluid inclusions data from four deposits. To achieve this work data from pyrite, quartz and wolframite where used to extract fluid inclusions petrography and thermodynamic information. Fluid inclusions in ore minerals and gangue minerals were formed at the same mineralization period but differ in petrography and thermodynamic properties. Hence primary ore minerals are high temperature and salinity, and the later ore are with a more stable type of inclusions. Since it was recognized that infrared light intensity will result in overestimate of fluid salinity and underestimate of homogenization temperatures, little impact exits in the interpretation of these petrography and thermodynamic properties.
The different characters of fluid inclusions of coexisting ore minerals and gangue minerals formed at the same period also affect the interpretation of ore-forming mechanism. Thus fluid inclusions in wolframite indicated that the ore-forming fluid was not homogeneous. Then the ore fluid may be extracted form the intrusive rocks and enter into the fractures, where it mixed with underground water and with a release of pressure, and causes the deposition of ore minerals. In addition the fluid inclusions in quartz show that it may be form at the later stage when the groundwater with lower salinity and temperature dominates.
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