Other
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984gecoa..48.2713l&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 48, Issue 12, pp.2713-2722
Other
2
Scientific paper
The solubility of bunsenite (NiO) in Cl-bearing fluids in the range of 450°-700°C, 1-2 kbar was determined using the Ag + AgCl acid buffer technique. Based on the results of the experiments, it is concluded that the associated NiCl 0 2 complex is the dominant Ni species in the fluid over the entire temperature-pressure range investigated. The temperature dependence of the equilibrium constant for the reaction NiO ( s ) + 2 HCl 0 ( aq ) = NiCl 0 2 ( aq ) + H 2 O is given by log K = -4.17(±0.55) + 4629(±464)/ T ( K ) at 1 kbar, and log K = -4.75(±0.91) + 5933(±756)/ T ( K ) at 2 kbar. The calculated difference in standard state Gibbs free energy of formation between NiCl 0 2 and 2HCl 0 in kcal is G 0 ( NiCl 0 2 ) - 2 G 0 ( HCl 0 ) = -20.77(±2.22) + 0.03264(±0.0026) T ( K ), at 1 kbar and G 0 ( NiCl 0 2 ) - 2 G 0 ( HCl 0 ) = -25.01(±1.35) + 0.03264(±0.0016) T ( K ) at 2 kbar. Comparison of the solubilities of Ni end-member minerals with those of Ca, Mn, Fe, and Mg indicates that nickel minerals generally are the least soluble at a given temperature and pressure. The relatively low solubility of Ni end-member minerals, combined with the relatively low concentration of Ni in most rocks, should result in a quite low mobility of Ni in hydrothermal fluids.
Lin Saulwood
Popp Robert K.
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