The determination of phase relations in the CH 4 -H 2 O-NaCl system at 1 kbar, 400 to 600°C using synthetic fluid inclusions

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Synthesis of fluid inclusions in the CH 4 -H 2 O-NaCl system was accomplished by subjecting fractured quartz, along with known quantities of CH 4 , H 2 O, and NaCl, to a pressure of 1 kbar and temperatures of 400, 500, or 600°C, in sealed Au capsules. Under the elevated P - T conditions some of the fractures healed, trapping fluids as inclusions. Microthermometric measurements conducted on the fluid inclusions show that at 1 kbar and 400 to 600°C, there are very broad regions of fluid unmixing in the CH 4 -H 2 O-NaCl system. For those bulk fluid compositions that lie in the two-phase (i.e., immiscible fluids) field, the high density phase is enriched in NaCl, whereas the low density phase is enriched in CH 4 . For any given bulk composition, the degree of NaCl enrichment in the high density phase increases, whereas the degree of CH 4 enrichment in the low density phase decreases, as temperature increases from 400 to 600°C.

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