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• W120848110 abstract "In the scope of our efforts t o include the metallic phase into computer models simulating the melting-crystallisation relationships in meteoritic igneous systems [I -21, we present 2 empirical equations which describe the Fe and solubilities in silicate melts at 1 atm as a function of temperature, oxygen fugacity and the melt composition. A ~ ~ r o a c h . The empirical basis for this study is a library of 1-atm melting experiments that have been carried out in synthetic and natural systems. Data on the equilibrium between the pure iron and silicate melts include 396 runs conducted at 11 50-1327OC under controlled oxygen fugacities -1 4.5 < logf02 < -1 1.0 [3-51. The melt compositions range from basaltic t o andesitic, with FeO contents varying from 6 to 60 wt.%. The data set contains systems enriched both in K20 (up to 13 wt%) and AI2O3 (up to 23 wt%); several experiments were conducted on magnesium-free and high-Ti compositions. The data on solubility include 31 experiments on natural melts equilibrated with FeNi alloys (highly enriched in Ni) [6,71 and 22 runs conducted on An-Di eutectic composition equilibrated with the pure metal 181. These experiments were conducted in the range of temperatures 1 1 22-1 437OC and oxygen fugacities -1 2.6 < logf02 < -8.2 and cover compositional range as large as '3 orders of magnitude of contents in the melts. These data were processed by the least-squares fitting to obtain expressions: where Me0 is FeO or NiO, a ~ , (Metal) is the activity of Fe or in the metal 191, and the regression parameters h and di account for the effects of temperature and melt composition. The division of FeO, in melts into ~ e ~ + and ~ e ~ + species was carried out using the Borisov and Shapkin's equation [ lo ] ; the XI values (mol%) were calculated on the ironand nickel-free basis. The calculated regression parameters with standard deviation for each are listed in Table 1. Testina the eaua tions. A t given parameters of the regression, one can use the equation (1) to calculate FeO or NiO solubility in the experimental melts used to calibrate the equation. Plots in Fig. 1 (A,C) compare the calculated values with those obtained in experiments. This fitting is good, and we would specially emphasize an excellent agreement of the calculated and experimental contents at 100-200 ppm level (INAA, synthetic composition [81) and at 1-2% level (microprobe analyses, natural compositions [6,71). One can also invert the calculations t o reproduce the oxygen fugacity or the temperature of the metal-silicate equilibrium at given FeO or NiO contents in the melts. These data are shown on Fig. 1 (B,D) and indicate a high accuracy of 0.1 log units for the log fop calculations. The difference between the calculated and experimental temperatures is shown in frequency histograms. Conclusion. The equations presented above provide a good thermodynamic basis for the development of a numerical model simulating Fe-Ni metal-silicate equilibrium in meteoritic igneous systems [I 1 I. O Lunar and Planetary Institute Provided by the NASA Astrophysics Data System 134 LPS XXVII FE AND NI SOLUBILITY IN SILICATE MELTS: Borisov, A. and Ariskin, A. Table 1. Regression constants h and d, for the empirical expressions (1) which best describeFe and N/ solubilities a I CaO 1 -0.00411(0.00147) 1 -0.00950(0.00586~ 1 ~a; iablm 1 K.K References. 11 I Ariskin,A.A. et al. (1 993) Geochem.lntern., 30, 13-22; 121 Ariskin,A.A. et al. (1 994) LPSC XXV, 37-38; [31 Roeder, P.L. (1974) Earth Planet. Sci. Lett., 23, 397410; [41 Doyle, C.D. and Naldrett, A.J. (1986) GCA, 50, 435-443; 151 Doyle,C.D. (1988) GCA, 52, 1827-1 834; [61 Campbell, I.H. et al. (1 979) Can. Mineral., 17,495-505; [71 Snyder,D.A. and Carmichael, I.S.E. (1 992) GCA, 56, 303-318; [81 Holzheid,A. et al. (1 994) GCA, 58, 1975-1 981; [91 Tomiska, J. and Neckel, A. (1985) Ber. Bunsenges. Phys.Chem., 89, 1 104-1 109; [I01 Borisov, A.A. and Shapkin, A.I. (1990) Geochem. Intern., 27, 1 1 1-1 16; [I 1 I Ariskin, A.A. et at. ( 1 996) This volume. Fig. 1. Comparison of values IogFeO, IogNiO and fiD, observed in experiments with those calculated using the parameters given in Table 1 (A, B Fen equation; C, D Ni equation). 2.0 0.5 'Fen muation: Constant (la)" @default.
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• W120848110 date "1996-03-01" @default.
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• W120848110 title "Fe and NI Solubility in Silicate Melts Equilibrated with Metal" @default.
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