Synthetic fluid inclusions: XIII. Experimental determination of PVT properties in the system H 2 O+ 40 wt % NaCl + 5 mol% C0 2 at elevated temperature and pressure

Details Synthetic fluid inclusions: XIII. Experimental determination of PVT properties in the system H 2 O+ 40 wt % NaCl + 5 mol% C0 2 at elevated temperature and pressure Synthetic fluid inclusions: XIII. Experimental determination of PVT properties in the system H 2 O+ 40 wt % NaCl + 5 mol% C0 2 at elevated temperature and pressure

Oct 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995gecoa..59.3953s&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 59, Issue 19, pp.3953-3959

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The location of the liquid + vapor liquid phase boundary and the P - T slopes of iso- Th lines were determined for a constant composition of 40 ± 0.1 wt% NaCl and 5 ± 0.15 mol% C0 2 (both relative to H 2 O) at high density. Synthetic fluid inclusions with this composition were formed in cold-seal pressure vessels at pressures of 2 and 4 kbar and temperatures between 350° and 700°C. The inclusions were analyzed on a gas-flow heating/cooling stage to determine the temperatures of halite dissolution [ Tm (H+L+V L+V) ] and total homogenization [ Th (L+v L) ]. Addition of 40 wt% NaCl to an aqueous solution containing 5 mol% C0 2 causes a significant shift of the liquid + vapor liquid boundary towards higher pressures. The slopes of the iso- Th lines decrease from 29.5 bars/°C for Th (L+V L) of 400°C, to 6.4 bars/°C for Th (L+v L) = 600°C. Addition of 5 mol% C0 2 to an aqueous solution containing 40 wt% NaCl results in halite dissolution temperatures that are slightly higher ( TM (H+L+V L+V) 332°C) than the literature value of 323 C for the vapor-saturated liquidus of an H 2 O-40 wt% NaCI mixture. Calculated molar volumes for 40 wt% NaCl + 5 mot% C0 2 solutions at 2 and 4 kbar show trends that are similar to those of other compositions in the ternary system H 2 O---CO 2 ---NaCl at the same pressures and temperatures. In the P - T range of this study, all excess volumes are negative and lie between the values for the compositions H 2 O---5 mot% C0 2 and H 2 O---40 wt% NaCl.

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