Characterization of CO2-CH4-H2O fluid inclusions by microthermometry and laser Raman microprobe spectroscopy - Inferences for clathrate and fluid equilibria

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Carbon Dioxide, Clathrates, Methane, Raman Lasers, Raman Spectra, Water, Geophysical Fluids, Phase Diagrams, Room Temperature

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A set of 33 synthetically produced CO2-CH4-H2O fluid inclusions in quartz have been subjected to microthermometry (MT) and laser Raman microprobe (LRM) spectroscopy. The inclusions encompass an aqueous liquid, a CO2-CH4 supercritical carbonic fluid, and graphite. A method is presented by means of which MT data for these inclusions can be projected within the CO2-CH4 binary phase diagram to infer CO2:CH4 ratios in the carbonic fluid, taking into account the formation of CO2-CH4 clathrate during MT analysis. Comparison of LRM analyses on the bulk carbonic fluid and the residual carbonic fluid confirm the preferential partitioning of CH4 in the clathrate.

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