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Molybdenum Valence in Basaltic Silicate Melts: Effects of Temperature and Pressure

机译：玄武岩硅酸盐熔体中的钼价：温度和压力的影响

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The metal-silicate partitioning behavior of molybdenum has been used as a test for equilibrium core formation hypotheses (for example, 1-6). However, current models that apply experimental data to equilibrium core-mantle differentiation infer the oxidation state of molybdenum from solubility data or from multivariable coefficients from metal-silicate partitioning data (1,3,7). Molybdenum, a multi-valent element with a valence transition near the fO2 of interest for core formation (approx.IW-2) will be sensitive to changes in fO2 of the system and silicate melt structure. In a silicate melt, Mo can occur in either 4+ or 6+ valence state, and Mo(6+) can be either octahedrally or tetrahedrally coordinated. Here we present X-ray absorption near edge structure (XANES) measurements of Mo valence in basaltic run products at a range of P, T, and fO2 and further quantify the valence transition of Mo.

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Danielson, L. R.; Righter, K.; Newville, M.; Sutton, S.; Choi, Y.; Pando, K.;
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年度 2011
页码 1-2
总页数 2
原文格式 PDF
正文语种 eng
中图分类工业技术;
关键词
Melts(Crystal growth) ; Molybdenum ; Silicates ; Temperature effects ; X ray absorption ; Valence ; Oxidation ; Coefficients ; Hypotheses ; Sensitivity;

机译：熔体（晶体生长）;钼;硅酸盐;温度效应; X射线吸收;化合价;氧化;系数;假设;灵敏度;

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2. Valence state partitioning of Cr between pyroxene-melt: Effects of pyroxene and melt composition and direct determination of Cr valence states by XANES. Application to Martian basalt QUE 94201 composition [J] . J.M. Karner, J.J. Papike, S.R. Sutton, American Mineralogist . 2007,第11a12期

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3. Valence state partitioning of Cr between pyroxene-melt: Effects of pyroxene and melt composition and direct determination of Cr valence states by XANES. Application to Martian basalt QUE 94201 composition [J] . Karner JM, Papike JJ, Sutton SR, The American mineralogist . 2007,第11a12期

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Molybdenum Valence in Basaltic Silicate Melts: Effects of Temperature and Pressure

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