Browsing ELibrary by Author "O'Neill H.St.C."
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Browsing ELibrary by Author "O'Neill H.St.C."
Now showing items 1-11 of 11
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Canil D.; O'Neill H.St.C. (1996)The distribution of ferric iron among the phases of upper-mantle rocks, as a function of pressure (P), temperature (T) and bulk composition, has been studied using 57Fe Mössbauer spectroscopy to determine the Fe3+/ΣFe ...
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O'Neill H.St.C.; Nell J. (1997)The Gibbs free energies of formation of RuO2, OsO2 and IrO2 have been determined by measuring the chemical potentials of oxygen (μO2) defined by the reactions M + O2 = MO2, where M = Ru, Os. or Ir, using an electrochemical ...
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Liu X.; O'Neill H.St.C. (2004)The compositions of multiply saturated partial melts are valuable for the thermodynamic information that the contain, but are difficult to determine experimentally because they exist only over a narrow temperature range ...
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Liu X.; O'Neill H.St.C. (2004)Chromium as Cr3+ substitutes for octahedrally coordinated Al in upper-mantle minerals, thereby reducing the activity of Al2O3 in the system and hence the concentration of Al2O3 in partial melts. The effect of Cr2O3 on melt ...
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Witt-Eickschen G.; O'Neill H.St.C. (2005)The abundance of 30 trace elements has been determined in the minerals of 16 well-equilibrated spinel lherzolite xenoliths by laser-ablation inductively-coupled-plasma mass-spectrometry (LA-ICP-MS). Major elements were ...
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O'Neill H.St.C.; Pownceby M.I.; McCammon C.A. (2003)The chemical potential of oxygen (µO2) in equilibrium with magnesiowustite solid solution (Mg, Fe)O and metallic Fe has been determined by gas-mixing experiments at 1,473 K supplemented by solid-cell EMF experiments at ...
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Klemme S.; O'Neill H.St.C. (2000)The position of the transition from spinel lherzolite to garnet lherzolite in the system CaO-MgO-Al2O3-SiO2 (CMAS) has been determined experimentally at near-solidus temperatures. In reversed experiments, the transition ...
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O'Neill H.St.C.; Wall V.J. (1987)The common upper mantle assemblage olivine-orthopyroxene-spinel may be used to calculate the oxygen fugacity at which mantle-derived peridotites have equilibrated. The equilibrium has been calibrated using the large amount ...
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O'Neill H.St.C.; Mavrogenes J.A. (2002)The solubility of sulfur as S2– has been experimentally determined for 19 silicate melt compositions in the system CaO–MgO–Al2O3–SiO2(CMAS) ± TiO2 ± FeO, at 1400°C and 1 bar, using CO–CO2–SO2 gas mixtures to vary oxygen ...
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Pownceby M.I.; O'Neill H.St.C. (2000)Activities of CoO in (Co,Mn)O solid solutions in contact with metallic Co have been determined on ten compositions ranging from 0.12 to 0.84 XCoO in order to calibrate the divariant equilibrium between (Co,Mn)O oxide ...
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Berry A.J.; O'Neill H.St.C.; Jayasuriya K.D.; Campbell S.J.; Foran G.J. (2003)Fe K-edge X-ray absorption near edge structure (XANES) spectra were recorded for a series of anorthite-diopside eutectic glasses containing 1 wt% 57 Fe2O3 quenched from melts equilibrated over a range of oxygen fugacities ...
Now showing items 1-11 of 11
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