An assessment of the accuracy of isochore location techniques for H 2 O-CO 2 -NaCl fluids at granulite facies pressure-temperature conditions

Details An assessment of the accuracy of isochore location techniques for H 2 O-CO 2 -NaCl fluids at granulite facies pressure-temperature conditions An assessment of the accuracy of isochore location techniques for H 2 O-CO 2 -NaCl fluids at granulite facies pressure-temperature conditions

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992gecoa..56..295j&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 56, Issue 1, pp.295-302

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Scientific paper

Synthetic H 2 O-CO 2 -NaCl fluid inclusions with XCO 2 compositions ranging from 0.10-0.51 and relative salinities (r-s = wt NaCl /(wt NaCl + wt H 2 O )) of 6 to 23.9 wt% have been produced in spontaneously nucleated forsterite, diopside, and orthopyroxene hosts. Molar volumes of the fluids at the pressure and temperature of formation have been calculated using microthermometric data from the fluid inclusions. These P - V - T data are used to compare the accuracy of published methods of isochore location for H 2 O-CO 2 -NaCl fluids at elevated pressures and temperatures. The results of these analyses show that isochores calculated with the MRK equation of and ( Geochim. Cosmochim. Acta , vol. 47 , 1247-1275, 1983) reproduce the trapping pressures and temperatures well for fluids with XCO 2 0.3 and up to 23.9 wt% NaCl. For a fluid with XCO 2 = 0.49 and relative salinity of 15%, however, the agreement is poor. For these fluid compositions, the observed molar volume is larger than that predicted from the MRK equation of Bowers and Helgeson and, if not corrected, will give isochores that are too low in pressure for a given temperature. The ideal geometric mixing model of and ( Geochim. Cosmochim. Acta , vol. 53 , 1209-1221, 1989) provides less satisfactory results for the fluid compositions studied.

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