Fluid inclusion filling temperature

The fluid inclusions can be divided into two types vapor- and liquid-rich fluid inclusions. The filling degree of fluid inclusions from some samples from the silicified and alunite zones is variable and homogenization temperatures vary widely. This indicates... 

Figure 1.87. Summary of filling temperatures of fluid inclusions from Neogene vein-type deposits in Japan. Solid circle represents average filling temperatures of fluid inclusions for individual deposits (Shikazono, 1985b).

Filling temperature and NaCl eq. concentration of fluid inclusions from epithermal gold-silver and base-metal vein-type deposits (Shikazono and Shimizu, 1992)... 

Figure 1.178. Comparison between the stannite-sphalerite temperatures and filling temperatures of fluid inclusions or sulfur isotope temperatures. NT Nakatatsu, OB Obira, KN Kano, KG Kuga, TM Tsumo, KM Kamioka, OT Ohtani, KU Kaneuchi, Ak Akenobe, TT Takatori, YT Yatani (Shimizu and Shikazono, 1985).

Shikazono, N. (1985d) A comparison of temperatures estimated from the electrum-sphalerite-pyrite-argentite assemblage and filling temperatures of fluid inclusions from epithermal Au-Ag vein-type deposits in Japan. Econ. Geol, 80, 1415-1424. 

Figure 1. Excess internal energy (split in ion-dipole (fluio = flU o/V) and dipole-dipole (3un = SU fl/V) contributions) and chemical potential for a dipolar fluid inclusion in ionic matrices quenched at low temperature floe2/a — 1 (solid line and filled triangles) and high temperature floe2/a = 0.005 (dashed line and filled circles). The dotted lines correspond to the ion-dipole equilibrated mixture at fle2 /a = 1 for the corresponding charge densities. Curves denote ROZ results and symbols GCMC data[18].

In summary, it appears that the chemistry of the fluids that passed through the fractures, was regulated by the water-mineral interactions occurring in contact with the matrix of the shales. The pressure/temperature conditions in the past, which are not well constrained, needs further investigation. Temperatures below 60°C are derived from a preliminary study of the scarce fluid inclusions within the calcite fillings. 

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