Computer Science
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990gecoa..54.1255k&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 54, Issue 5, pp.1255-1265
Computer Science
22
Scientific paper
Experiments in the simple system CaO-MgO-Al 2 O 3 -SiO 2 -Na 2 O-FeO were carried out to investigate the control of temperature and melt composition on the partitioning of nickel between olivine and silicate melt ( D oliv / liq Ni ). Eleven experiments determine the influence of changing forsterite (Fo) content on D oliv / liq Ni in this simple system. The equation of and (1978) that accounts for the variation of D oliv / liq Ni in terms of MgO content of the silicate liquid is tested using experimental data from ironbearing simple and natural systems and found to be inadequate to explain the observed variation of D oliv / liq Ni (±39% relative average error of prediction). Two different equations are formulated to describe the partitioning behavior of Ni between olivine and silicate melt. The first is similar to that of and (1978) and uses an expression for Ni-Mg exchange between olivine and silicate melt. The second uses an expression for the Ni-olivine formation reaction. The Ni-Mg exchange equation for D oliv / liq Ni depends on the forsterite content of the olivine and the mole fraction MgO liq , and predicts the experimentally determined values within ±13% relative average error. The Ni-olivine formation reaction equation for D oliv / liq Ni depends on temperature, mole fraction SiO liq 2 , and melt compositional terms that arise from a symmetric, binary, Margules formulation of the activity coefficients for NiO liq and SiO liq 2 . This equation predicts the experimentally determined values within ±9% relative average error.
Grove Timothy L.
Kinzler Rosamond J.
Recca Steven I.
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