Professor Hugh O'Neill

Professor
ARC Laureate Fellow
Researcher - Experimental Petrology
J1, 122
 +61 2 61255159

Profile

Biography

Academic Qualifications

BA Geology (Oxford University) 1975

PhD (Manchester University) 1978

Publications

  • Palme, H and O’Neill, H.St.C. Cosmochemical Estimates of Mantle Composition. Treatise on Geochemistry, 2nd Edition, Vol. 3: The Mantle and Core. Ed. R.W. Carlson.  Elsevier. 2014. http://www.sciencedirect.com/science/article/pii/B9780080959757002011
  • Jollands, M.C., O’Neill, H.St.C. and Hermann, J. The importance of defining chemical potentials, substitution mechanisms and solubility in trace element diffusion studies: the case of Zr and Hf in olivine. Contributions to Mineralogy and Petrology, 168, Article Number: 1055, 2014.
  • Padrón-Navarta, J.A., Hermann, J. and O'Neill, H.St. C. Site-specific hydrogen diffusion rates in forsterite. Earth and Planetary Science Letters, 392, 100-112, 2014.
  • Zhukova, I., O’Neill, H. St.C., Cambell, I.H. and Kilburn, M.R. The effect of silica activity on the diffusion of Ni and Co in olivine. Contributions to Mineralogy and Petrology, 168, Article Number: 1029, 2014.
  • Stewart, G.A., Salama, H.A., Voyer, C.J., Ryan, D.H., Scott, D. and O’Neill, H.St.C. A Mössbauer investigation of orthorhombic phase YbMnO3. Hyperfine Interactions, 1-9, 2014.
  • McKibbin, S.J., O’Neill, H.St.C., Mallmann, G. and Halfpenny, A. (2013). LA-ICP-MS mapping of olivine from the Brahin and Brenham meteorites: Complex elemental distributions in the pallasite olivine precursor. Geochimica et Cosmochimica Acta, 119, 1-17, 2013.
  • McKibbin, S.J., Ireland, T.R., Amelin, Y., O’Neill, H.St.C. and Holden, P. Mn–Cr relative sensitivity Factors for Secondary Ion Mass Spectrometry analysis of Mg–Fe–Ca olivine and implications for the Mn–Cr chronology of meteorites. Geochimica et Cosmochimica Acta, 110, 216-228, 2013.
  • Pirard, C., Hermann, J., and O’Neill, H.St.C. Petrology and geochemistry of the crust–mantle boundary in a nascent arc, Massif du Sud Ophiolite, New Caledonia, SW Pacific. Journal of Petrology, 54, 1759-1792, 2013.
  • Mallmann, G. and O’Neill, H.St.C. Calibration of an empirical thermometer and oxybarometer based on the partitioning of Sc, Y and V between olivine and silicate melt. Journal of Petrology, 54, 933-949, 2013.
  • O’Neill, H.St.C. and Jenner, F.E. The global pattern of trace-element distributions in ocean floor basalts. Nature, 491 (7426) 698-704 (doi:10.1038/nature11678), 2012.
  • Jenner, F.E. and O’Neill, H.St.C. Major and trace analysis of basaltic glasses by laser-ablation ICP-MS. Geochem. Geophys. Geosystems 13, doi:10.1029/2011GC003890, 2012.
  • Jenner, F.E. and O’Neill, H.St.C. Analysis of 60 Elements in 616 Ocean Floor Basaltic Glasses. Geochem. Geophys. Geosystems 13, doi:10.102/2011GC004009, 2012.
  • Campbell, I.H and O’Neill, H.St.C. Evidence against a chondritic Earth. Nature, 483 (7391) 553-558 (doi:10.1038/nature11678), 2012.
  • Kovács, I., Green,D.H., Rosenthal, A., Hermann, J., O’Neill H St. C,. Hibberson, W.O., Udvardi, B. An Experimental Study of Water in Nominally Anhydrous Minerals in the Upper Mantle near the Water-saturated Solidus. J. Petrology (2012) 53(10): 2067-2093 doi:10.1093/petrology/egs044 2012
  • Tailby, N.D., Walker, A.M., Berry, A.J, Hermann, J., Evans, K.A., Mavrogenes, J.A., O’Neill, H.St.C., Rodina, I.S., Soldatov A.V., Rubatto D., and S. R. Sutton. Ti site occupancy in zircon. Geochim. Cosmochim. Acta 75, 905-921 (doi: 10.1016/j.gca.2010.11.004), 2011.
  • Foley, S.F., Jacob, D.E. and O’Neill, H.St.C. Trace element variations in olivine phenocrysts from Ugandan potassic rocks as clues to the chemical characteristics of parental magmas. Contrib. Mineral. Petrol. 162, 1-20 (doi:10.1007/s00410-010-0579-y), 2011.
  • Fonseca, R.O, Mallmann, G., O’Neill, H.St.C., Campbell, I.H. and Laurenz, V. Solubility of Os and Ir in sulfide melt: Implications for Re/Os fractionation during mantle melting. Earth Planet. Sci. Lett 311, 339-350 (doi: 10.1016/j.epsl.2011.09.035), 2011.
  • Tuff, J. and O'Neill, H.St.C. The effect of sulfur on the partitioning of Ni and other first-row transition elements between olivine and silicate melt. Geochim. Cosmochim. Acta. 74, 6180-6205 doi:10.1016/j.gca.2010.08.01. 2010
  • Qian, Q., O’Neill, H.St.C., and Hermann, J. Comparative diffusion coefficients of major and trace elements in olivine at ~ 950ºC from a xenocryst included in dioritic magma. Geology, 38, 331-334, 2010.
  • Kovács I, O’Neill, H.St.C., Hermann, J., and Hauri, E.H. Site-specific infrared O-H absorption coefficients for water substitution into olivine. Amer. Mineral. 95, 292-299, 2010.
  • Spandler, C. and O’Neill, H.St.C., Diffusion and partition coefficients of minor and trace elements in San Carlos olivine at 1300 ºC with some geochemical implications. Contrib. Mineral. Petrol. 159, 791-818 (doi:10.1016/j.gca.2009.06.038), 2010.
  • Salama, H.A., Stewart, G.A., Nishimura, K, Scott, D.R. and O'Neill, H.St.C. A 169Tm-Mossbauer spectroscopy investigation of orthorhombic phase o-TmMnO3. Solid State Communications, 150, 289-291 (doi:10.1016/j.ssc.2009.11.002), 2009.
  • Evans, K.A., O’Neill, H.St.C., Mavrogenes, J.A., Keller, N.S., Jang L-Y. and Lee, J-F. XANES evidence for sulphur speciation in Mn-, Ni- and W-bearing silicate melts. Geochim. Cosmochim. Acta, 73, 6847-6867 doi:10.1016/j.gca.2009.08.013, 2009.
  • Jenner, F.E., Holden, P., Mavrogenes, J.A., O’Neill, H.St.C. and Allen, C. Determination of selenium concentrations in NIST SRM 610, 612, 614 and geological glass reference materials using the electron probe, LA-ICP-MS and SHRIMP II. Geostandards and Geoanalytical Research 33, 309-317., 2009.
  • Mallmann, G., and O’Neill, H.St.C. The crystal/melt partitioning of V during mantle melting as a function of oxygen fugacity compared with some other elements (Al, P, Ca, Sc, Ti, Cr, Fe, Ga, Y, Zr and Nb). J. Petrol. 50: 1765-1794, 2009.
  • Fonseca, R.O.C., Campbell, I.H., O’Neill, H.St.C. and Allen, C.M. Solubility of Pt in sulphide mattes: Implications for the genesis of PGE-rich horizons in layered intrusions. Geochim. Cosmochim. Acta 73: 5764-5777 (doi:10.1016/j/gca.2009.06.038), 2009
  • Métrich, N., Berry, A.J., O’Neill, H.St.C. and Susini, J. The oxidation state of sulfur in synthetic and natural glasses determined by X-ray absorption spectroscopy. Geochim. Cosmochim. Acta, 73: 2382-2399 (doi:10.1016/j.gca.2009.01.025), 2009.
  • Witt-Eickschen, G., Palme, H., O’Neill, H.St.C. and Allen, C.M. The geochemistry of the volatile trace elements As, Cd, Ga, In and Sn in the Earth's mantle: New evidence from in situ analyses of mantle xenoliths. Geochim. Cosmochim. Acta 73: 1755-1778 (doi:10.1016/j.gca.2008.12.013), 2009
  • Mallmann, G., O’Neill, H.St.C. and Klemme, S. Heterogeneous distribution of phosphorus in olivine from otherwise well-equilibrated spinel peridotite xenoliths and its implications for the mantle geochemistry of lithium. Contrib. Mineral. Petrol. 158: 485-504, 2009.
  • *O’Neill, H.St.C. and Palme, H. Collisional erosion and the non-chondritic composition of the terrestrial planets. Phil. Trans. Roy. Soc. A. 366: 4205-4238, 2008.
  • Fonseca, R.O.C., Campbell, I.H., O’Neill, H.St.C. and Fitz Gerald, J.D. Oxygen solubility and speciation in sulphide-rich mattes. Geochim. Cosmochim. Acta 72: 2619-2635, 2008.
  • Kovacs, I., Hermann, J., O’Neill, H.St.C, Fitz Gerald, J.D. and Sambridge, M. Quantitative absorbance spectroscopy with unpolarized light: Part II. Experimental evaluation and development of a protocol for quantitative analysis of mineral IR spectra. Amer. Min. 93: 765-778, 2008.
  • Sambridge, M. Fitz Gerald, J.D. Kovacs, I. O’Neill, H.St.C. and Hermann, J. Quantitative absorbance spectroscopy with unpolarized light: Part I. Physical and mathematical development. Amer. Min. 93: 751-764, 2008.
  • Evans, K.A., O’Neill, H.St.C. and Mavrogenes, J.A. Sulphur solubility and sulphide immiscibility in silicate melts as a function of the concentration of manganese, nickel, tungsten and copper at 1 atm and 1400˚C. Chem. Geol. 255: 236-249. 2008.
  • Berry, A.J., Danyushevsky, L.V., O’Neill, H.St.C., Newville, M. and Sutton, S.R. Oxidation state of iron in komatiitic melt inclusions indicates hot Archaean mantle. Nature, 455: 960-963, 2008.
  • O’Neill, H.St.C., Berry, A.J., and Eggins, S.M. The solubility and oxidation state of tungsten in silicate melts: Implications for the comparative chemistry of W and Mo in planetary differentiation processes. Chem. Geol., 255: 346-359, 2008.
  • Evans, K.A., Mavrogenes, J.A., O’Neill, H.St.C., Keller, N.S. and Jang, L.-Y. A preliminary investigation of chlorine XANES in silicate glasses. Geochem. Geophys. Geosystems, G3, 9: doi:10.1029/2008GC002157, 2008.
  • Evans, T.M., O’Neill, H.St.C. and Tuff, J. The influence of melt composition on the partitioning of REEs, Y, Sc, Zr and Al between forsterite and melt in the system CMAS. Geochim. Cosmochim. Acta, 72: 5708-5721, 2008
  • Berry, A.J., Walker, A.M., Hermann, J., O’Neill, H.St.C., Foran, G.J. and Gale, J.D. Titanium substitution mechanisms in forsterite. Chemical Geology, 242: 176-186, 2007.
  • Berry, A.J., O’Neill, H.St.C., Hermann, J. and Scott, D.R. The infrared signature of water associated with trivalent cations in olivine. Earth Planet. Sci. Lett. 261: 134-142, 2007.
  • Fonseca, R.O.C., Mallmann, G., O’Neill, H.St.C. and Campbell, I.H. How chalcophile is rhenium? An experimentalstudy of the solubility of Re in sulphite mattes. Earth Planet. Sci. Lett. 260: 537-548, 2007.
  • Xi, L., and O’Neill, H.St.C. Effects of P2O5 and TiO2 on the partial melting of spinel lherzolite in the system CaO-MgO-Al2O3-SiO2 at 1.1 GPa, Canadian Min., 45: 649-655, 2007.
  • *Spandler, C., O’Neill, H.St.C., and Kamenetsky, V. Survival times of anomalous melt inclusions: constraints from element diffusion in olivine and chromite, Nature, 447: 303-306, 2007.
  • Walker, A.M., Hermann, J., Berry, A.J., and O’Neill, H.St.C. Three water sites in upper mantle olivine and the role of titanium in the water weakening mechanism. J. Geophy. Res., 112: B05211, 2007.
  • Mallmann, G., and O’Neill, H.St.C. The effect of oxygen fugacity on the partitioning of Re between crystals and silicate melt during mantle melting. Geochim. Cosmochim. Acta. 71: 2837-2857, 2007.
  • Berry, A.J., O’Neill, H.St.C., Scott, D.R., Foran, G.J. and Shelley, J.M.G. The effect of composition on Cr2+/Cr3+in silicate melts. Am. Mineral., 91: 1901-1908, 2006.
  • O’Neill, H.St.C., Free energy of formation of zircon and hafnon. Amer. Mineral., 91: 1134-1141, 2006.
  • Sinmyo, R., Hirose, K., O’Neill, H.St.C., Okunishi, E. Ferric iron in Al-bearing post-perovskite, Geophys. Res. Lett., 33: L12S13, doi: 10.1029/2006GL025858.
  • O’Neill, H.St.C., and Berry, A.J. Activity coefficients at low dilution of CrO, NiO and CoO in melts in the system CaO-MgO-Al2O 3-SiO2 at 1400˚C: Using the thermodynamic behaviour of transition metal oxides in silicate melts to probe their structure. Chem. Geol., 231: 77-89, 2006.
  • O’Neill, H.St.C., Berry, A.J., McCammon, C.C., Jayasuriya, K.D., Campbell, S.J., Foran, G. An experimental determination of the effect of pressure on the Fe3+/∑Fe ratio of an anhydrous silicate melt to 3.0 GPa. Amer. Mineral., 91: 2-3, 404-412, 2006.
  • Norman, M.D., McCulloch, M.T., O’Neill, H.St.C., and Yaxley, G.M. Magnesium isotopic analysis of olivine by laser-ablation multi-collector ICP-MS: composition dependent matrix effects and a comparison of the Earth and Moon. J. Anal. At. Spectrom. 21: 1, 50-54, 2006
  • *Liu, X, O’Neill, H.St.C., and Berry, A.J. The effects of small amounts of H2O, CO2 and Na2O on the partial melting of spinel lherzolite in the system CaO-MgO-Al2O3-SiO2 ± H2O ± CO2 ± Na2O at 1.1 GPa. J. Petrol., 47: 409-434, 2006.
  • Golla-Schindler, U., O’Neill, H.St.C., and Putnis, A. Direct observation of spinodal decomposition in the magnetite-hercynite system by susceptibility measurements and transmission electron microscopy. Amer. Mineral., 90: 1278-1283, 2005.
  • O’Neill, H.St.C. A method for controlling alkali-metal oxide activities in one-atmosphere experiments and its application to measuring the relative activity coefficients of NaO0.5 in silicate melts. Amer. Mineral. 90: 497-501, 2005.
  • Berry, A.J., Hermann, J., O’Neill, H.St.C., and Foran, G.J. Fingerprinting the water site in mantle olivine. Geology, 33: 869-872, 2005.
  • *Witt-Eickschen, G., and O’Neill, H.St.C. The effect of temperature on the equilibrium distribution of trace elements between clinopyroxene, orthopyroxene, olivine and spinel in upper mantle peridotite. Chem. Geol., 221: 65-101, 2005.
  • O’Neill, H.St.C., James, M., Dollase, W.A., and Redfern, S,A,T. Temperature dependence of the cation distribution in CuAl2O4 spinel. Eur. J. Mineral, 17: 581-586, 2005.
  • O’Neill, H.St.C., and Scott, D.R. The free energy of formation of Mg2TiO4 (synthetic qandilite), an inverse spinel with configurational entropy, Eur. J. Mineral, 7: 315-323, 2005
  • Hermann, J., O’Neill, H.St.C., and Berry, A.J. Titanium solubility in olivine in the system TiO2-MgO-SiO2: no evidence for an ultra-deep origin of Ti-bearing olivine. Contrib. Mineral. Petrol., 48: 746-760, 2005
  • Jayasuriya, K.D., O’Neill, H.St.C., Berry, A.J. Campbell, S.J. A Mossbauer study of the oxidation state of Fe in silicate melts, Amer. Mineral., 89: 1597-1609, 2004.
  • Liu, X., and O’Neill, H.St.C. The effect of Cr2O3 on the partial melting of spinel lherzolite in the system CaO-MgO-Al2O3-SiO2-Cr2O3 at 1.1 GPa. J. Petrol., 45: 2261-2286, 2004.
  • Liu, X., and O’Neill, H.St.C. Partial melting of spinel lherzolite in the system CaO-MgO-Al2O3-SiO2 +/- K2O at 1 center dot 1 GPa. J. Petrol., 45: 1339-1368, 2004
  • *Berry, A.J., O’Neill, H.St.C. A XANES determination of the oxidation state of chromium in silicate glasses, Amer. Mineral., 89: 790-798, 2004
  • *O’Neill, H.St.C., Pownceby, M.I., and McCammon, C.A. The magnesiowustite: iron equilibrium and its implications for the activity-composition relations of (Mg,Fe)2SiO4 olivine solid solutions. Contrib. Mineral. Petrol., 146: 308-325, 2003.
  • Wang, Z.W., Schiferl, D., Zhao, Y.S., and O’Neill, H.St.C. High pressure Raman spectroscopy of spinel-type ferrite ZnFe2O4. J. Phys. Chem. Solids, 64: 2517-2523, 2003.
  • O’Neill, H.St.C. The influence of next nearest neighbours on cation radii in spinels: the example of the Co2O4-CoCr2O2 solid solution, Min. Mag., 67: 547-554, 2003.
  • Berry, A.J., O’Neill, H.St.C., Jayasuriya, K.D., Campbell, S.J., and Foran, G.J. XANES calibrations for the oxidation state of iron in a silicate glass. Amer. Mineral., 88: 967-977, 2003
  • Berry, A.J., Shelley, J.M.G., Foran, G.J., O’Neill, H.St.C., Scott, D.R.A furnace design for XANES spectroscopy of silicate melts under controlled oxygen fugacities and temperatures to 1773 K, J. Synchrotron Rad., 10: 332-336, 2003.
  • Wang, Z.W., Saxena, S.K., Lazor, P. and O’Neill, H.St.C. An in situ Raman spectroscopic study of pressure induced dissociation of spinel NiCr2O4. J. Phys. Chem. Solids 64: 425-431, 2003.
  • O’Neill, H.St.C., Redfern, S.A.T., Kesson, S. and Short, S. An in situ neutron diffraction study of cation disordering in synthetic qandilite Mg2TiO4 at high temperatures. Amer. Mineral. 88: 860-865, 2003.
  • Wang, Z., O’Neill, H.St.C., Lazor, P. and Saxena, S.K. High pressure Raman spectroscopy study of spinel MgCr2O4. J. Phys. Chem. Solids 63: 2057-2061, 2002.
  • Wang, Z., Lazor, P., Saxena, S.K. and O’Neill, H.St.C. High pressure Raman spectroscopy of ferrite MgFe2O4. Mat. Res. Bull. 37: 1589-1602, 2002
  • *O’Neill, H.St.C. and Mavrogenes, J.A. The sulfide capacity and the sulfur content at sulfide saturation of silicate melts at 1400°C and 1 bar. J. Petrol. 43: 1049-1087, 2002.
  • *O’Neill, H.St.C. and Eggins, S.M. The effect of melt composition on trace element partitioning: an experimental investigation of the activity coefficients of FeO, NiO, CoO, MoO2 and MoO3 in silicate melts. Chem. Geol. 186: 151-181, 2002.
  • Kesson, S.E., FitzGerald, J.D., O’Neill, H.St.C. and Shelley, J.M.G. Partitioning of iron between magnesian silicate perovskite and magnesiowüstite at about 1 Mbar. Phys. Earth Planet. Int. 131: 295-310, 2002.
  • Matveev, S., O’Neill, H.St.C., Ballhaus, C., Taylor, W.R. and Green, D.H. Effect of Silica Activity on OH IR Spectra of Olivine: Implications for low-a SiO2 Mantle Metasomatism. J. Petrol. 42: 721-729,2001
  • Ertel, W., O’Neill, H.St.C., Sylvester, P.J., Dingwell, D.B. and Spettel, B. The solubility of rhenium in silicate melts: Implications for the geochemical properties of rhenium at high temperatures. Geochim. Cosmochim. Acta 65: 2161-2170, 2001.
  • McCammon, C.A., Griffin, W.L., Shee, S.R. and O’Neill, H.St.C. Oxidation during metasomatism in ultramafic xenolitH. St.C., from the Wesselton kimberlite, South Africa: implications for the survival of diamond. Contrib. Mineral. Petrol. 141: 287-296, 2001.
  • Klemme, S., O’Neill, H.St.C., Schnelle, W. and Eberhard, G. The heat capacity of MgCr2O4, FeCr2O4, and Cr2O3 at low temperatures and derived thermodynamics properties. Amer. Mineral. 85: 1686-1693, 2000.
  • Klemme, S. and O’Neill, H.St.C. The near-solidus transition from garnet lherzolite to spinel-lherzolite: Experiments in the system CaO-MgO-Al2O3-SiO2. Contrib. Mineral. Petrol. 138: 237-248, 2000.
  • *Klemme, S. and O’Neill, H.St.C. The effect of Cr on the solubility of Al in orthopyroxene: experiments and thermodynamic modelling. Contrib. Mineral. Petrol. 140: 84-98, 2000.
  • Holzheid, A., Sylvester, P., O’Neill, H.St.C., Rubie, D.C. and Palme, H. Evidence for a late chondritic veneer in the Earth’s mantle from high-pressure partitioning of palladium and platinum. Nature 406: 396-399, 2000.
  • Grey, I.E., Madsen, I.C., Hibberson, W.O. and O’Neill, H.St.C. CaAl12Si4O27, a new high-pressure phase containing Al6O19 clusters. J. Solid State Chem. 153: 391-397, 2000.
  • Klemme, S., O’Neill, H.St.C., Schnelle, W. and Eberhard, G. The heat capacity of MgCr2O4, FeCr2O4, and Cr2O3 at low temperatures and derived thermodynamics properties. Amer. Mineral. 85: 1686-1693, 2000
  • Pownceby, M.I. and O’Neill, H.St.C. Thermodynamic data from redox reactions at high temperatures. VI. Thermodynamic properties of CoO-MnO solid solutions from emf measurements. Contrib. Mineral. Petrol. 140: 28-39, 2000.
  • Redfern, S.A.T., Harrison, R.J., O’Neill, H.St.C. and Wood, D.R.R. Thermodynamics and kinetics of cation ordering in MgAl2O4 spinel up to 1600°C from in-situ neutron diffraction. Amer. Mineral. 84: 299-310, 1999.
  • Mavrogenes, J.A. and O’Neill, H.St.C. The relative effects of pressure, temperature and oxygen fugacity on the solubility of sulfide in mafic magmas. Geochim. Cosmochim. Acta 63: 1173-1180, 1999.
  • Jephcoat, A.P., Hriljac, J.A., McCammon, C.A., O’Neill, H.St.C., Rubie, D.C. and Finger, L. W. High-resolution synchrotron X-ray powder diffraction and Rietveld structure refinement of two (Mg0.95, Fe0.05) SiO3 perovskite samples synthesized under different oxygen fugacity conditions. Amer. Mineral. 84: 214-220, 1999.
  • Grey, I.E., Madsen, I.C., O’Neill, H.St.C., Kesson, S. E. and Hibberson, W. O. Rietveld refinement of high-pressure CaAl4Si2O11 with the R-type ferrite structure. Neues Jahrbuch Mineral. Monatshefte: 104-112, 1999.
  • Ertel, W., O’Neill, H.St.C., Sylvester, P. and Dingwell, D.B. Solubilities of Pt and Rh in a haplobasaltic melt at 1300°C. Geochim. Cosmochim. Acta 63: 9-2449, 1999.
  • O’Neill, H.St.C., Canil, D. and Rubie, D.C. Oxide-metal equilibria to 2500°C and 25 GPa: Implications for core formation and the light component in the Earth’s core. J. Geophys. Res. 103(B): 12,239-12,260, 1998.
  • O’Neill, H.St.C. Partitioning of Fe and Mn between ilmenite and olivine at 1100°C: constraints on the thermodynamic mixing properties of (Fe,Mn) TiO3 ilmenite solid solutions. Contrib. Mineral. Petrol. 133: 284-296, 1998.
  • Harrison, R.J., Redfern, S.A.T. and O’Neill, H.St.C. The temperature dependence of the cation distribution in synthetic hercynite (FeAl2O4) from in-situ neutron structure refinements. Amer. Mineral. 83: 1092-1099, 1998.
  • O’Neill, H.St.C. and Nell, J. Gibbs free energies of formation of RuO2, IrO2, and OsO2: a high temperature electrochemical and calorimetric study. Geochim. Cosmochim. Acta 61: 5279-5293, 1997.
  • Woodland, A.B. and O’Neill, H.St.C. Thermodynamic data for Fe-bearing phases obtained using noble metal alloys as redox sensors. Geochim. Cosmochim. Acta 61: 4359-4366, 1997.
  • Nell, J. and O’Neill, H.St.C. The Gibbs free energy of formation and heat capacity of -Rh2O3 and "MgRh2O4", the Mg-Rh-O phase diagram, and constraints on the stability of Mg2Rh4+O4. Geochim. Cosmochim. Acta 61: 4159-4171, 1997.
  • Klemme, S. and O’Neill, H.St.C. The reaction MgCr2O4+SiO2=Cr2O3+MgSiO3 and the free energy of formation of magnesiochromite (MgCr2O4). Contrib. Mineral. Petrol. 130: 59-65, 1997.
  • Falloon, T.J., Green, D.H., O’Neill, H.St.C. and Hibberson, W.O. Experimental tests of low degree peridotite partial melt compositions: implications for the nature of anhydrous near-solidus peridotite melts at 1 GPa. Earth Planet. Sci. Lett. 152: 149-162, 1997.
  • Ertel, W., Dingwell, D.B. and O’Neill, H.St.C. Compositional dependence of the activity of Ni in silicate melts. Geochim. Cosmochim. Acta 61: 4707-4722, 1997.
  • Dollase, W.A. and O’Neill, H.St.C. The spinels CuCr2O4 and CrRh2O4. Acta Cryst. C53: 657-659, 1997.
  • Ross, C.R. II., Keppler, H., Canil, D. and O’Neill, H.St.C. Structure and crystal- field spectra of Co2Al2(SiO4)3 and (Mg, Ni)3Al2(SiO4) garnet. Amer. Mineral. 81: 61-66, 1996.
  • Palme, H. and O’Neill, H.St.C. Formation of the Earth’s core. Geochim. Cosmochim. Acta 60: 1105-1108, 1996.
  • Nell, J. and O’Neill, H.St.C. Gibbs free energy of formation and heat capacity of PdO: A new calibration of the Pd-PdO buffer to high temperatures and pressures. Geochim. Cosmochim. Acta 60: 2487-2493, 1996.
  • Falloon, T. J., Green, D. H. and O’Neill, H.St.C. Quest for low-degree mantle melts. Nature 381: 285, 1996.
  • Ertel, W., O’Neill, H.St.C., Dingwell, D. B. and Spettel, B. Solubility of tungsten in a haplobasaltic melt as a function of temperature and oxygen fugacity. Geochim. Cosmochim. Acta 60: 1171-1180, 1996.
  • *Canil, D. and O’Neill, H.St.C. Distribution of ferric iron in some upper-mantle assemblages. J. Petrol. 37: 609-635, 1996.
  • Woodland, A. B. and O’Neill, H.St.C. Phase relations between - garnet and CaFeSi2O6-Fe2Si2O6 pyroxene solid solutions. Contrib. Mineral. Petrol. 121: 87-98, 1995.
  • Woodland, A.B., Droop, G. and O’Neill, H.St.C. Very almandine-rich garnet from near Collobrières, Southern France, and its petrological significance. Eur. J. Mineral. 7: 187-194, 1995.
  • Wendschuh-Josties, M., O’Neill, H.St.C., Bente, K. and Brey, G. Lattice and oxygen parameters of ZnGa2O4 as a function of equilibration temperature. Neues Jahrbuch Mineral. Monatshefte: 273-280, 1995.
  • Pownceby, M.I. and O’Neill, H.St.C. Thermodynamic data from redox reactions at high temperatures. V. Thermodynamic properties of NiO-MnO solid solutions by a solid electrolyte (EMF) cell technique. Contrib. Mineral. Petrol. 119: 409-421, 1995.
  • O’Neill, H.St.C., Dingwell, D.B., Borisov, A., Spettel, B. and Palme, H. Experimental petrochemistry of some highly siderophile elements at high temperatures, and some implications for core formation and the mantle’s early history. Chem. Geol. 120: 255-273, 1995.
  • Li, J.-P., O’Neill, H.St.C. and Seifert, F. Subsolidus phase relations in the system MgO-SiO2-Cr-O in equilibrium with metallic Cr, and their significance for the petrochemistry of chromium. J. Petrol. 36: 107-132, 1995.
  • Holzheid, A. and O’Neill, H.St.C. The Cr-Cr2O3 oxygen buffer and the free energy of formation of Cr2O3 from high-temperature electrochemical measurements. Geochim. Cosmochim. Acta 59: 475-479, 1995.
  • Pownceby, M.I. and O’Neill, H.St.C. Thermodynamic data from redox reactions at high temperatures. IV. The Re-ReO2 oxygen buffer: an experimental calibration using emf and hydrothermal methods. Contrib. Mineral. Petrol. 118: 130-137, 1994.
  • Pownceby, M.I. and O’Neill, H.St.C. Thermodynamic data from redox reactions at high temperatures. III. The nickel-palladium oxygen fugacity sensor: calibration from EMF measurements at 850K-1250K. Contrib. Mineral. Petrol. 116: 327-339, 1994.
  • O’Neill, H.St.C. Temperature dependence of the cation distribution in CoAl2O4 spinel. Eur. J. Mineral. 6: 603-609, 1994.
  • Larsson, L., O’Neill, H.St.C. and Annersten, H. Crystal chemistry of synthetic hercynite (FeAl2O4) from XRD structural refinements and Mössbauer spectroscopy. Eur. J. Mineral. 6: 39-51, 1994.
  • Dollase, W.A., Seifert, F. and O’Neill, H.St.C. Structure of Cr2SiO4 and possible metal-interactions in crystal and melt. Phys. Chem. Minerals 21: 104-109, 1994.
  • O’Neill, H.St.C. and Dollase, W.A. Crystal structures and cation distributions in simple spinels from powder XRD structural refinements: MgCr2O4, ZnCr2O4, Fe3O4 and the temperature dependence of the cation distribution in ZnAl2O4. Phys. Chem. Minerals 20: 541-555, 1994.
  • Dingwell, D.B., O’Neill, H.St.C., Ertel, W. and Spettel, B. The solubility and oxidation state of Ni in silicate melt at low oxygen fugacity: results using a mechanically assisted equilibration technique. Geochim. Cosmochim. Acta 58: 1967-1974, 1994.
  • Canil, D., O’Neill, H.St.C., Pearson, D.G., Rudnick, R., McDonough, W.F. and Carswell, D.A. Ferric iron in peridotites and mantle oxidation states. Earth Planet. Sci. Lett. 123: 205-220, 1994.
  • Woodland, A.B. and O’Neill, H.St.C. Synthesis and stability of garnet and phase relations with Fe3Al2Si3O12 - solid solutions. Amer. Mineral. 78: 1002-1015, 1993.
  • von Seckendorff, V. and O’Neill, H.St.C. Experimental determination of the partitioning of Mg and Fe2+ between olivine and orthopyroxene at 900, 1000 and 1150°C and 1.6 GPa: constraints on activity-composition relations in binary Mg-Fe olivine and orthopyroxene solid solutions. Contrib. Mineral. Petrol. 113: 196-207, 1993.
  • Rubie, D.C., Karato, S., Yan, H. and O’Neill, H.St.C. Low differential stress and controlled chemical environment in multianvil high-pressure experiments. Phys. Chem. Minerals 20: 315-322, 1993.
  • O’Neill, H.St.C., Rubie, D.C., Canil, D., Geiger, C.A., Ross, C.R. II., Seifert, F. and Woodland, A. B. Ferric iron in the upper mantle, and in transition zone assemblages: implications for relative oxygen fugacities in the mantle. Proceedings of the IUGG Symposium on Chemical Evolution of the Earth and Planets. IUGG Volume 14: 73-88, 1993.
  • O’Neill, H.St.C. and Pownceby, M.I. Thermodynamic data from redox reactions at high temperatures. II. The MnO-Mn3O4 oxygen buffer, and implications for the thermodynamic properties of MnO and Mn3O4. Contrib. Mineral. Petrol. 114: 315-320, 1993.
  • O’Neill, H.St.C., McCammon, C., Rubie, D. .C., Canil, D., Ross, C.R. II. and Seifert, F. Mössbauer parameters and minimum Fe3+ contents in transition zone phases. Amer. Mineral. 78: 456-460, 1993
  • O’Neill, H.St.C. and Pownceby, M.I. Thermodynamic data from redox reactions at high temperatures. I. An experimental and theoretical assessment of the electrochemical method using stabilized zirconia electrolytes, with revised values for the Fe-"FeO", Co-CoO, Ni-NiO and Cu-Cu2O oxygen buffers, and new data for the W-WO2 buffer. Contrib. Mineral. Petrol. 114: 296-314, 1993.
  • Ganguly, J., Cheng, W. and O’Neill, H.St.C. Syntheses, volume, and structural changes of garnets in the pyrope-grossular join: implications for stability and mixing properties. Amer. Mineral. 78: 583-593, 1993.
  • O’Neill, H.St.C., Annersten, H. and Virgo, D. The temperature dependence of the cation distribution in magnesioferrite (MgFe2O4) from powder XRD structural refinements and Mössbauer spectroscopy. Amer. Mineral. 77: 725-740, 1992.
  • O’Neill, H.St.C. Temperature dependence of the cation distribution in zinc ferrite (ZnFe2O4) from powder XRD structural refinements. Eur. J. Mineral. 4: 571-580, 1992.
  • O’Neill, H.St.C. Siderophile elements and the Earth’s formation. Technical comment on "Early differentiation of the Earth and the problem of mantle siderophile elements" by V.R. Murthy. Science 257: 1282-1284, 1992.
  • McCammon, C. A., Rubie, D.C., Ross C.R. II,, Seifert, F. and O’Neill, H.St.C. Mössbauer spectra of 57Fe0.05Mg0.95SiO3 perovskite at 80 and 298 K. Amer. Mineral. 77: 894-897, 1992.
  • Pownceby, M.I., Wall, V.J. and O’Neill, H.St.C. An experimental study of the effect of Ca upon garnet-ilmenite Fe-Mn exchange equilibria. Amer. Mineral. 76: 1580-1589, 1991.
  • O’Neill, H.St.C., Dollase, W.A. and Ross, C.R. II. Temperature dependence of the cation distribution in nickel aluminate (NiAl2O4) spinel: a powder XRD study. Phys. Chem. Mineral. 18: 302-319, 1991.
  • O’Neill, H.St.C., Annersten, H. and Virgo, D. Fe3+, Mg order-disorder in heated MgFe2O4; a powder XRD and 57Fe Mössbauer study. Carnegie Inst. of Washington Yearbook 1990-1991: 93-100, 1991.
  • O’Neill, H.St.C. The origin of the Moon and the early history of the Earth -a chemical model. Part 2: The Earth. Geochim. Cosmochim. Acta 55: 1159-1172, 1991.
  • O’Neill, H.St.C. The origin of the Moon and the early history of the Earth - a chemical model. Part 1: The Moon. Geochim. Cosmochim. Acta 55: 1135-1157, 1991.
  • Jaques, A.L., O’Neill, H.St.C., Smith, C.B., Moon, J. and Chappell, B.W. Diamondiferous periodite xenoliths from the Argyle (AK1) lamproite pipe, Western Australia. Contrib. Mineral. Petrol. 104: 255-276, 1990.
  • O’Neill, H.St.C., Pownceby, M.I. and Wall, V.J. Activity - composition relations in FeTiO3-MnTiO3 ilmenite solid solutions from emf measurements. Contrib. Mineral. Petrol. 103: 216-222, 1989.
  • Seifert, S., O’Neill, H.St.C. and Brey, G. The partitioning of Fe, Ni and Co between olivine, metal and basaltic liquid : An experimental and thermodynamic investigation with application to the composition of the lunar core. Geochim. Cosmochim. Acta 52: 603-616, 1988.
  • O’Neill, H.St.C., Pownceby, M.I. and Wall, V.J. Ilmenite-rutile-iron and ulvospinel-ilmenite-iron equilibria and the thermochemistry of ilmenite (FeTiO3) and ulvospinel (Fe2TiO4). Geochim. Cosmochim. Acta 52: 2065-2072, 1988.
  • O’Neill, H.St.C. Systems Fe-O and Cu-O: thermodynamic data for the equilibria Fe-"FeO," Fe-Fe3O4, "FeO"-Fe3O4, Fe3O4-Fe2O3, Cu-Cu2O, and Cu2O-CuO from emf measurements. Amer. Mineral. 73: 470-486, 1988.
  • Seifert, S. and O’Neill, H.St.C. Experimental determination of activity - composition relations in Ni2SiO4-Mg2SiO4 and Co2SiO4-Mg2SiO4 olivine solid solutions at 1200K and 0.1 MPa and 1573K and 0.5GPa. Geochim. Cosmochim. Acta 51: 97-104, 1987.
  • Pownceby, M. I., Wall, V.J. and O’Neill, H.St.C. Fe-Mn partitioning between garnet and ilmenite: experimental calibration and applications. Contrib. Mineral. Petrol. 97: 116-126, 1987.
  • O’Neill, H.St.C. and Wall, V.J. The olivine-orthopyroxene-spinel oxygen geobarometer, the nickel precipitation curve, and the oxygen fugacity of the earth’s upper mantle. J. Petrol. 28: 1169-1191, 1987.
  • O’Neill, H.St.C. Quartz-fayalite-iron and quartz-fayalite-magnetite equilibria and the free energy of formation of fayalite (Fe2SiO4) and magnetite (Fe3O4). Amer. Mineral. 72: 67-75, 1987.
  • O’Neill, H.St.C. Free energies of formation of NiO, CoO, Ni2SiO4, and Co2SiO4. Amer. Mineral. 72: 280-291, 1987.
  • O’Neill, H.St.C. Mo-MoO2 (MOM) oxygen buffer and the free energy of formation of MoO2. Amer. Mineral. 71: 1007-1010, 1986.
  • O’Neill, H.St.C. The free energies of formation of the hexagonal and tetragonal forms of germanium dioxide. J. Chem. Thermodynamics 18: 465-471, 1986.
  • Holmes, R.D., O’Neill, H.St.C. and Arculus, R.J. Standard Gibbs free energy of formation for Cu2O, NiO, CoO, and FexO: High resolution electrochemical measurements using zirconia solid electrolytes from 900-1400 K. Geochim. Cosmochim. Acta 50: 2439-2452, 1986.
  • O’Neill, H.St.C. Thermodynamics of Co3O4: a possible electron spin unpairing transition in Co3+. Phys. Chem. Minerals 12: 149-154, 1985.
  • O’Neill, H.St.C. and Navrotsky, A. Cation distributions and thermodynamic properties of binary spinel solid solutions. Amer. Mineral. 69: 733-753, 1984.
  • O’Neill, H.St.C. and Navrotsky, A. Simple spinels: crystallographic parameters, cation radii, lattice energies and cation distribution. Amer. Mineral. 68: 181-194, 1983.
  • O’Neill, H.St.C. The transition between spinel lherzolite and garnet lherzolite and its use as a geothermometer. Contrib. Mineral. Petrol. 77: 185-194, 1981.
  • O’Neill, H.St.C. and Wood, B.J. An experimental study of Fe-Mg partitioning between garnet and olivine and its calibration as a geothermometer. Contrib. Mineral. Petrol. 70: 59-70, 1979.

Updated:  23 November 2017/Responsible Officer:  RSES Webmaster/Page Contact:  RSES Webmaster