| Fluids are widely distributed in every sphere of the earth, and they participate in many geological activities and the evolution of earth. More and more researchers pay attention to geofluids’ studies at present. H2 O and Na Cl-H2 O systems are very important geofluids whose thermodynamic properties are always the basis to estimate the physicochemical parameters of hydrothermal deposits. With the development of hydrothermal diamond anvil cell technique, we can obtain the quantitative relationship between Raman shift and temperature and pressure of H2 O and Na Cl-H2 O systems in a closed and isometric condition. We can also obtain the relationship between Raman intensity ratio and temperature of the two systems.In this paper, the quantitative relationship among Raman shift, temperature and pressure for the two important systems(H2O and Na Cl-H2 O system) have been systematically studied by using hydrothermal diamond anvil cell(HDAC) and Raman spectra technique with bubble to determine pressure. At the same time, we also found the relationship between Raman intensity ratio and temperature and salinity of the two systems. The results indicate that Raman shift difference of OH stretching band under closed and isometric condition increases with the rise of temperature, and some increase first and then decrease which take a shape of parabola with the downward opening. A binomial relation has been found between the Raman shift of OH stretching band and pressure. The Raman intensity ratios decrease with the increase of salinity. These results are a significant supplement for the study of Raman spectrometry quality under medium-low temperature, filling the data blank of this temperature and pressure. |
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