Major- and trace-element magnetite-melt equilibria
作者： Roger L. Nielsen , Lance M. Forsythe , William E. Gallahan , Martin R. Fisk
DOI: 10.1016/0009-2541(94)90127-9
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摘要: The effects of composition and temperature on the partitioning behavior Sc, Ni, V, U Th, high field strength elements (HFSE) Zr, Nb, Ta Hf between magnetite natural silicate melts were evaluated from doped experiments mafic- to intermediate-composition lavas at 1-atm pressure. Composition was found be strongest controlling factor behavior. partition coefficients (D) for correlate with DTi are similar one another any given magnetite-melt pair, but vary 2 in titanomagnetite. DSc is higher than DZr, DNb, DHf DTa, also correlated DTi. In contrast, Ni more compatible Al-Cr-rich magnetites titanomagnetites, all pairs our experiments. V generally Hf, its complicated by multiple valence states. Th incompatible (D < 0.035) magnetites. Expressions derived describe relationship D most strongly parameters, oxide Fe/Mg ratio Al, These patterns consistent observed miscibility gap spinel-group end-members. Equilibrium constants spinel end-member-melt reactions parameterized terms temperature, pressure composition. expressions can used predict equilibrium spinels. major-element constraints spinel-melt using describing DHFSE as a function
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