An extended equation to calculate NaCl contents from final clathrate melting temperatures in H 2 O-CO 2 -NaCl fluid inclusions: Implications for P - T isochore location

Details An extended equation to calculate NaCl contents from final clathrate melting temperatures in H 2 O-CO 2 -NaCl fluid inclusions: Implications for P - T isochore location An extended equation to calculate NaCl contents from final clathrate melting temperatures in H 2 O-CO 2 -NaCl fluid inclusions: Implications for P - T isochore location

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991gecoa..55.3869d&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 55, Issue 12, pp.3869-3871

Physics

8

Scientific paper

This report informs fluid inclusion researchers of an extended equation to calculate wt% NaCl from final CO 2 -clathrate melting temperatures in H 2 O-CO 2 -NaCl fluid inclusions. This equation is valid only if melting occurs in the presence of CO 2 -liquid, CO 2 -vapor, and salt solution. Previous workers used the equation of Bozzo et al. (1973, 1975 ) for salinity calculations; however, their equation is limited to clathrate melting temperatures between 10 and about 0°C (0-16 wt% NaCl). Application of this equation to final clathrate melting temperatures from 0°C to the peritectic temperature of -10.0°C (16-24.2 wt% NaCl) yields significant errors in calculated NaCl content. Experimental data over the entire range of 10 to -10.0°C is provided by Chen (1972b) and his best fit equation is W = +0.00098241(10- T )( T 2 + 45.385 T + 1588.75), where W is the wt% NaCl and T is the final clathrate melting temperature (°C). The values of W calculated by this equation are relative only to the salt solution (independent of CO 2 content) and have an average and maximum deviation of 1.33 and 5.61%, respectively ( from the experimentally determined values of W ). This equation should be used instead of the equation of Bozzo et al. (1973, 1975) in fluid inclusion data reduction programs such as HAL W AT and CHNACL described by Nicholls and Craw-Ford (1985) and FLINCOR described by Brown (1989). Without such correction, calculation of isochore position in P - T space using these programs may yield significant errors if fluid inclusions have final clathrate melting temperatures between 0 and --10.0°C.

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