Abstract:

The Yanwuping mercury deposit is an important mercury deposit in TongFeng mercury belt. The studies of fluid inclusions show that there are several types of inclusions in this deposit, including H2O inclusions, hydrocarbonH2O inclusions, hydrocarbon inclusions and solid cinnabar inclusions. The homogenization temperatures of the gasliquid H2O inclusions vary between of 82.4 ℃ and 176.5 ℃, with salinity ranging from 13.40％ to 21.75％NaCl and density varying between 1.05 g/cm3 and 1.10 g/cm3. The oreforming fluid has the characteristics of oilfield brine with high salinity and high density. Asphalt and cinnabar inclusions are typically found in the same microfissures, and asphalt inclusions are also captured in cinnabar crystals. Asphalt wraps cinnabar particles while hydrocarbon inclusions and solid cinnabar inclusions coexist. Evidence shows that the mercury mineralization was closely related to the organic matter, which provides important information for the study of the role of organic matter in the mercury mineralization process.

Key words:  inclusions, organic oreforming fluid, paleooil reservoir, mercury deposit, Yanwuping