Application of in situ cryogenic Raman spectroscopy to analyze synthetic fluid inclusions in the systems CaCl2-H2O and MgCl2-H2O II: Phase transformation behaviour at lower temperatures

In situ cryogenic Raman spectra technique had been successfully used in studying the synthetic fluid inclusions of systems CaCl2-H2O and MgCl2-H2O. The combination of laser Raman microspectroscopy and microthermometry was applied to collect cryogenic Raman spectra on inclusions at different lower temperatures. This study shows that the different freezing methods, which depend on the salt content of inclusions, can be applied to collect effectively the Raman spectra. The salt kinds can be identified by the lower temperature Raman spectra of given salt hydrate and phase transformation behaviour can be record precisely by the systemic Raman spectra collecting. In situ cryogenic Raman spectra study on the synthetic inclusions laid the basis for the application of this technique to natural produced inclusions. It is believed that it will playing an irreplaceable role on the fluid inclusion research field in the future.