Areas of expertise

• Planetary Science (Excl. Extraterrestrial Geology) 020108
• Igneous And Metamorphic Petrology 040304
• Inorganic Geochemistry 040202
• Mineralogy And Crystallography 040306

Current student projects

Publications

• Sievwright, R, O'Neill, H, Tolley, J et al. 2020, 'Diffusion and partition coefficients of minor and trace elements in magnetite as a function of oxygen fugacity at 1150C', Contributions to Mineralogy and Petrology, vol. 175, no. 5, pp. -.
• Jollands, M, Zhukova, I, O'Neill, H et al. 2020, 'Mg diffusion in forsterite from 1250-1600 c', American Mineralogist, vol. 105, no. 4, pp. 525-537.
• Mare, E, O'Neill, H, Berry, A et al. 2020, 'The stability of divalent Ge in silicate melts and its geochemical properties', Chemical Geology, vol. 532, pp. 1-14.
• Miller, L, O'Neill, H, Berry, A et al. 2019, 'The oxidation state and coordination environment of antimony in silicate glasses', Chemical Geology, vol. 524, pp. 283-294.
• Le Losq, C, Berry, A, Kendrick, M et al 2019, 'Determination of the oxidation state of iron in Mid-Ocean Ridge basalt glasses by Raman spectroscopy', American Mineralogist, vol. 104, no. 7, pp. 1032-1042.
• Firth, C, Adam, J, Turner, S et al 2019, 'Experimental constraints on the differentiation of low-alkali magmas beneath the Tonga arc: Implications for the origin of arc tholeiites', Lithos, vol. 344-345, pp. 440-451.
• O'Neill, H, Berry, A & Mallmann, G 2019, 'The oxidation state of iron in Mid-Ocean Ridge Basaltic (MORB) glasses: Implications for their petrogenesis and oxygen fugacities (vol 504, pg 152, 2018)', Earth and Planetary Science Letters, vol. 527.
• Anenburg, M & O'Neill, H 2019, 'Redox in Magmas: Comment on a Recent Treatment of the Kaiserstuhl Volcanics (Braunger et al., Journal of Petrology, 59, 1731-1762, 2018) and Some Other Misconceptions', Journal of Petrology, vol. 60, no. 9, pp. 1825-1832.
• Burnham, A & O'Neill, H 2019, 'Mineral�melt partition coefficients and the problem of multiple substitution mechanisms: insights from the rare earths in forsterite and protoenstatite', Contributions to Mineralogy and Petrology, vol. 175, no. 0010-7999.
• Sossi, P, Prytulak, J & O'Neill, H 2018, 'Experimental calibration of vanadium partitioning and stable isotope fractionation between hydrous granitic melt and magnetite at 800°C and 0.5 GPa', Contributions to Mineralogy and Petrology, vol. 173, pp. 1-18pp.
• Zhukova, I, O'Neill, H, Campbell, I et al 2018, 'Diffusion and solubilities of Rh, Ru and Ir in olivine and spinel', Chemical Geology, vol. 494, pp. 19-29.
• Berry, A, Stewart, G, O'Neill, H et al. 2018, 'A re-assessment of the oxidation state of iron in MORB glasses', Earth and Planetary Science Letters, vol. 483, pp. 114-123pp.
• O'Neill, H, Berry, A & Mallmann, G 2018, 'The oxidation state of iron in Mid-Ocean Ridge Basaltic (MORB) glasses: Implications for their petrogenesis and oxygen fugacities', Earth and Planetary Science Letters, 504, 152-162.
• King, H, Plümper, O, Putnis, C et al 2017, 'Mineral Surface Rearrangement at High Temperatures: Implications for Extraterrestrial Mineral Grain Reactivity', ACS Earth and Space Chemistry, vol. 1, no. 2, pp. 113-121pp.
• Sossi, P, Nebel, O, O'Neill, H et al 2017, 'Zinc isotope composition of the Earth and its behaviour during planetary accretion', Chemical Geology, vol. 477, pp. 73-84pp.
• Sossi, P & O'Neill, H 2017, 'The effect of bonding environment on iron isotope fractionation between minerals at high temperature', Geochimica et Cosmochimica Acta, vol. 196, pp. 121-143.
• O'Neill, H 2016, 'The smoothness and shapes of chondrite-normalized rare earth element patterns in basalts', Journal of Petrology, vol. 57, no. 8, pp. 1463-1508.
• Burnham, A & O'Neill, H 2016, 'The effect of melt composition on mineral-melt partition coefficients: The case of beryllium', Chemical Geology, vol. 442, pp. 139-147.
• Jollands, M, Padron-Navarta, J, Hermann, J et al 2016, 'Hydrogen diffusion in Ti-doped forsterite and the preservation of metastable point defects', American Mineralogist, vol. 101, no. 7-8, pp. 1571-1583.
• Sossi, P & O'Neill, H 2016, 'Liquidus temperatures of komatiites and the effect of cooling rate on element partitioning between olivine and komatiitic melt', Contributions to Mineralogy and Petrology, vol. 171, no. 5, pp. (25 pp).
• Jollands, M, Burnham, A, O'Neill, H et al 2016, 'Beryllium diffusion in olivine: A new tool to investigate timescales of magmatic processes', Earth and Planetary Science Letters, vol. 450, pp. 71-82.
• McKibbin S.J, Ireland T.R., Holden P., O'Neill H.St.C., Mallmann G. (2016) Rapid cooling of planetesimal core-mantle reaction zones from Mn-Cr isotopes in pallasites, Geochemical Perspectives Letters, 2(1), 68-77.
• Sossi, P.A., Eggins, S.M., Nesbitt, R.W., Nebel, O., Hergt, J.M., Campbell, I.H., O’Neill, H.S.C., Van Kranendonk, M. and Davies, D.R., 2016. Petrogenesis and geochemistry of Archean komatiites. Journal of Petrology, 57, 147-184.
• Brandl, P, Regelous, M, Beier, C et al 2016, 'The timescales of magma evolution at mid-ocean ridges', Lithos, vol. 240, pp. 49-68.
• McCoy-West, A, Bennett, V, O'Neill, H et al. 2015, 'The interplay between melting, refertilization and carbonatite metasomatism in off-cratonic lithospheric mantle under Zealandia: An integrated major, trace and platinum group element study', Journal of Petrology, vol. 56, no. 3, pp. 563-604.
• Stewart, G, Salama, H, Voyer, C et al 2014, 'A Mössbauer investigation of orthorhombic phase YbMnO3', Hyperfine Interactions, vol. 230, pp. 195-203.
• Tollan, P.M.E., O'Neill, H.S.C., Hermann, J., Benedictus, A. and Arculus, R.J., 2015, 'Frozen melt-rock reaction in a peridotite xenolith from sub-arc mantle recorded by diffusion of trace elements and water in olivine', Earth and Planetary Science Letters, vol. 422, pp. 169-181.
• Wykes, J, O'Neill, H & Mavrogenes, J 2015, 'The effect of FeO on the sulfur content at sulfide saturation (SCSS) and the selenium content at selenide saturation of silicate melts', Journal of Petrology, vol. 56, no. 7, pp. 1407-1424.
• Palme, H & O'Neill, H 2014, 'Cosmochemical Estimates of Mantle Composition', in H.D. Holland and K.K. Turekian (ed.), Treatise on Geochemistry, 2nd Edition, Elsevier, Amsterdam, Netherlands, Kidlington, UK, Waltham, MA, USA, pp. 1-39.
• Jollands, M, O'Neill, H & Hermann, J 2014, '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, vol. 168, no. 3, pp. 1-19.
• Padron- Navarta, J, Hermann, J & O'Neill, H StC 2014, 'Site-specific hydrogen diffusion rates in forsterite', Earth and Planetary Science Letters, vol. 392, pp. 100-112.
• Zhukova, I, O'Neill, H StC, Campbell, I & Kilburn, M 2014, 'The effect of silica activity on the diffusion of Ni and Co in olivine', Contributions to Mineralogy and Petrology, vol. 168, pp. article 1029.
• Mallmann, G & O'Neill, H StC 2013, 'Calibration of an empirical thermometer and oxybarometer based on the partitioning of Sc, Y and V between olivine and silicate melt', Journal of Petrology, vol. 54, no. 5, pp. 933-949.
• McKibbin S.J., O’Neill H.St.C., Mallmann G., 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.
• Pirard, C, Hermann, J & O'Neill, H StC 2013, 'Petrology and geochemistry of the crust-mantle boundary in a Nascent Arc, Massif du Sud Ophiolite, New Caledonia, SW Pacific', Journal of Petrology, vol. 54, no. 9, pp. 1759-1792.
• Jenner, F & O'Neill, H 2012, 'Analysis of 60 elements in 616 ocean floor basaltic glasses', Geochemistry, Geophysics, Geosystems, vol. 13, no. 1, pp. 1-11.
• Jenner, F & O'Neill, H 2012, 'Major and trace analysis of basaltic glasses by laser-ablation ICP-MS', Geochemistry, Geophysics, Geosystems, vol. 13, no. 3, pp. 1-17.
• Kovács, I., Green, D.H., Rosenthal, A., Hermann, J., O’Neill, H., Hibberson, W., Udvardi, B. (2012). An experimental study of water in nominally anhydrous minerals in the upper mantle near the water saturated solidus. Journal of Petrology 53, 10, 2067-2093. https://doi.org/10.1093/petrology/egs044
• Campbell, I & O'Neill, H 2012, 'Evidence against a chondritic Earth', Nature, vol. 483, no. 7391, pp. 553-558.
• O'Neill, H & Jenner, F 2012, 'The global pattern of trace-element distributions in ocean floor basalts', Nature, vol. 491, no. 7426, pp. 698-704.
• Tailby, N, Walker, A, Berry, A et al 2011, 'Ti site occupancy in zircon', Geochimica et Cosmochimica Acta, vol. 75, no. 3, pp. 905-921.
• Fonesca, R., Campbell, I, O'Neill, H, et al 2011, 'Solubility of Os and Ir in sulfide melt: Implications for Re/Os fractionation during mantle melting', Earth and Planetary Science Letters, vol. 311, pp. 339-350.
• Foley, S, Jacob, D & O'Neill, H 2011, 'Trace element variations in olivine phenocrysts from Ugandan potassic rocks as clues to the chemical characteristics of parental magmas', Contributions to Mineralogy and Petrology, vol. 162, no. 1, pp. 1-20.
• Tuff, J & O'Neill, H 2010, 'The effect of sulfur on the partitioning of Ni and other first-row transition elements between olivine and silicate melt', Geochimica et Cosmochimica Acta, vol. 74, no. 21, pp. 6180-6205.
• Jenner, F, O'Neill, H, Arculus, R et al 2010, 'The magnetite crisis in the evolution of arc-related magmas and the initial concentration of Au, Ag and Cu', Journal of Petrology, vol. 51, no. 12, pp. 2445-2464.
• Spandler, C & O'Neill, H 2010, 'Diffusion and partition coefficients of minor and trace elements in San Carlos olivine at 1300 degrees C with some geochemical implications', Contributions to Mineralogy and Petrology, vol. 159, no. 6, pp. 791-818.
• Mavrogenes, J & O'Neill, H 2010, 'PGE diffusion through oxide and silicate phases', Biennial SGA Meeting of the Society for Geology Applied to Mineral Deposits 2009 SGA2009, James Cook University, Townsville, pp. 191-193.
• Salama, H, Stewart, G, Hutchison, W et al 2010, 'A ¹⁶⁹Tm-Mossbauer spectroscopy investigation of orthorhombic phase o-TmMaO₃', Solid State Communications, vol. 150, no. 5-6, pp. 289-291.
• Metrich, N, Berry, A, O'Neill, H et al 2009, 'The oxidation state of sulfur in synthetic and natural glasses determined by X-ray absorption spectroscopy', Geochimica et Cosmochimica Acta, vol. 73, no. 8, pp. 2382-2399.
• Berry, A, Danyushevsky, L, O'Neill, H et al 2008, 'Oxidation state of iron in komatiitic melt inclusions indicates hot Archaean mantle', Nature, vol. 455, pp. 960-964.
• Tailby, N, Walker, A, Berry, A et al 2011, 'Ti site occupancy in zircon', Geochimica et Cosmochimica Acta, vol. 75, no. 3, pp. 905-921.
• QIAN, Q, O'Neill, H & Hermann, J 2010, 'Comparative diffusion coefficients of major and trace elements in olivine at ~950 degrees C from a xenocryst included in dioritic magma', Geology, vol. 38, no. 4, pp. 331-334.
• Kovacs, I, O'Neill, H, Hermann, J et al 2010, 'Site-specific infrared O-H absorption coefficients for water substitution into olivine', American Mineralogist, vol. 95, no. 2-3, pp. 292-299.
• Jenner, F, Holden, P, Mavrogenes, J et al. 2009, 'Determination of selenium concentrations in NIST SMR 610, 612, 614 and geological glass reference materials using the electron probe, LA-ICP-MS and SHRIMP II', Geostandards and Geoanalytical Research, vol. 33, no. 3, pp. 309-317.
• Da Fonseca, R, Campbell, I, O'Neill, H et al. 2009, 'Solubility of Pt in sulphide mattes: Implications for the genesis of PGE-rich horizons in layered intrustions', Geochimica et Cosmochimica Acta, vol. 73, no. 19, pp. 5764-5777.
• Metrich, N, Berry, A, O'Neill, H et al 2009, 'The oxidation state of sulfur in synthetic and natural glasses determined by X-ray absorption spectroscopy', Geochimica et Cosmochimica Acta, vol. 73, no. 8, pp. 2382-2399.
• Tuff, J & O'Neill, H 2009, 'Olivine-melt Ni partitioning as a function of sulfur content in basaltic systems', V.M. Goldschmidt Conference 2009, ed. F.A. Podosek, Elsevier, United Kingdom, pp. A1351.
• Laurenz, V, Ballhaus, C, O'Neill, H et al 2009, 'Ir partitioning between chromite and silicate melt - The influence of Æ?O₂', V.M. Goldschmidt Conference 2009, ed. F.A. Podosek, Elsevier, United Kingdom, pp. A727.
• Kovacs, I, O'Neill, H, Hermann, J et al 2009, 'O-H absorption coefficients of four common mechanisms for water substitution in olivine', V.M. Goldschmidt Conference 2009, ed. F.A. Podosek, Elsevier, United Kingdom, pp. A690.
• Witt-Eickschen, G, Palme, H, O'Neill, H et al. 2009, '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', Geochimica et Cosmochimica Acta, vol. 73, pp. 1577-1778.
• Evans, K, O'Neill, H, Mavrogenes, J et al. 2009, 'XANES evidence for sulphur speciation in Mn-, Ni and W-bearing silicate melts', Geochimica et Cosmochimica Acta, vol. 73, no. 22, pp. 6847-6867.
• Mallmann G., O’Neill H.St.C. (2009). 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). Journal of Petrology 50, 1765-1794.
• Mallmann G., O’Neill H.St.C., Klemme S. (2009). Heterogeneous distribution of phosphorus in olivine from otherwise well-equilibrated spinel peridotite xenoliths and its implications for the mantle geochemistry of lithium. Contributions to Mineralogy and Petrology 158, 485-504.
• Berry, A, Danyushevsky, L, O'Neill, H et al 2008, 'Oxidation state of iron in komatiitic melt inclusions indicates hot Archaean mantle', Nature, vol. 455, pp. 960-964.
• Berry, A, O'Neill, H & Foran, G 2008, 'The oxidation of state or uranium in mantle melts', V.M. Goldschmidt Conference 2008, Pergamon Press, United Kingdom.
• O'Neill, H, Berry, A & Eggins, S 2008, 'The solubility and oxidation state of tungsten in silicate melts: Implications for the comparative chemistry of W and Mo in planetary differentiation processes', Chemical Geology, vol. 255, pp. 346-359.
• O'Neill, H & Palme, H 2008, 'Collisional erosion and the non-chondritic composition of the terrestrial planets', Philosophical Transactions of the Royal Society Series A, vol. 366, pp. 4205-4238.
• Evans, K, Mavrogenes, J, O'Neill, H et al 2008, 'A preliminary investigation of chlorine XANES in silica melts', V.M. Goldschmidt Conference 2008, Pergamon Press, United Kingdom, pp. A248.
• Fonseca, R, Mallmann, G, Campbell, I et al. 2008, 'The solubility of Os and Ir in sulphide melts: Implications for Os heterogeneity in the Earth's mantle', V.M. Goldschmidt Conference 2008, Pergamon Press, United Kingdom, pp. A277.
• Kovacs, I, Hermann, J, O'Neill, H et al. 2008, 'Quantitative absorbance spectroscopy with unpolarized light: Part II. Experimental evaluation and development of a protocol for quantitative analysis of mineral IR spectra', American Mineralogist, vol. 93, pp. 765-778.
• Evans, K, O'Neill, H & Mavrogenes, J 2008, 'Sulphur solubility and sulphide immiscibility in silicate melts as a function of the concentration of manganese, nickel, tungsten and copper at 1 atm and 1400ËšC', Chemical Geology, vol. 255, no. 1-2, pp. 236-249.
• Sambridge, M, Fitzgerald, J, Kovacs, I et al. 2008, 'Quantitative absorbance spectroscopy with unpolarized light: Part I. Physical and mathematical development', American Mineralogist, vol. 93, pp. 751-764.
• O'Neill, H & Palme, H 2008, 'Collisional erosion and the non-chondritic composition of the Earth', V.M. Goldschmidt Conference 2008, Pergamon Press, United Kingdom, pp. A696.
• Evans, K, Mavrogenes, J, O'Neill, H et al. 2008, 'A preliminary investigation of chlorine XANES in silicate glasses', Geochemistry, Geophysics, Geosystems, vol. 9, no. 10, pp. 15p.
• Evans, T, O'Neill, H & Tuff, J 2008, 'The influence of melt composition on the partitioning of REEs, Y, Sc, Zr and Al between forsterite and melt in the system CMAS', Geochimica et Cosmochimica Acta, vol. 72, pp. 5708-5721.
• Green, D, Hibberson, W & O'Neill, H 2008, 'Clarification of the influence of water on mantle wedge melting', V.M. Goldschmidt Conference 2008, Pergamon Press, United Kingdom, pp. A325.
• Fonseca, R, Campbell, I, O'Neill, H et al 2008, 'Oxygen solubility and speciation in sulphide-rich mattes', Geochimica et Cosmochimica Acta, vol. 72, pp. 2619-2635.
• Liu, X & O'Neill, H 2007, 'Effects of P₂O₅ and TiO₂ on the partial melting of spinel lherzolite in the system CaO-MgO-Al₂O₃-SiO₂ at 1.1 GPa', The Canadian Mineralogist, vol. 45, pp. 649-655.
• Berry, A, O'Neill, H, Hermann, J et al 2007, 'The infrared signature of water associated with trivalent cations in olivine', Earth and Planetary Science Letters, vol. 261, pp. 134-142.
• Spandler, C, O'Neill, H & Kamenetsky, V 2007, 'Survival times of anomalous melt inclusions from element diffusion in olivine and chromite', Nature, vol. 447, no. 17 May, pp. 303-306.
• Berry, A, Walker, A, Hermann, J et al 2007, 'Titanium substitution mechanisms in forsterite', Chemical Geology, vol. 242, pp. 176-186.
• Walker, A, Hermann, J, Berry, A et al 2007, 'Three water sites in upper mantle olivine and the role of titanium in the water weakening mechanism', Journal of Geophysical Research, vol. 112, pp. B05211.
• Fonseca R.O.C., Mallmann G., O’Neill H.St.C., Campbell I.H. (2007). How chalcophile is rhenium? An experimental study of the solubility of Re in sulphide mattes. Earth and Planetary Science Letters 260, 537-548.
• Mallmann G., O’Neill H.St.C. (2007). The effect of oxygen fugacity on the partitioning of rhenium between crystals and silicate melt during mantle melting. Geochimica et Cosmochimica Acta 71, 2837-2857.
• Liu, X, O'Neill, H & Berry, A 2006, '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 G', Journal of Petrology, vol. 47, no. 2, pp. 409-434.
• Berry, A, O'Neill, H, Scott, D et al 2006, 'The effect of composition on Cr²⁺/Cr³⁺ in silicate melts', American Mineralogist, vol. 91, pp. 1901-1908.
• Spandler, C & O'Neill, H 2006, 'Element re-equilibration of high-T melt inclusions via diffusion through the host crystals', V.M. Goldschmidt Conference 2006, ed. Conference Program Committee, Elsevier, United Kingdom, pp. A605.
• Ulrich, T, O'Neill, H & Mavrogenes, J 2006, 'Sulphur solubility in hydrous silicic melts at diffeent oxygen fugacities', V.M. Goldschmidt Conference 2006, ed. Conference Program Committee, Elsevier, United Kingdom, pp. A680.
• Kovacs, I, Hermann, J & O'Neill, H 2006, 'Water solubility in forsterite and enstatite; implications for the secular evolution of mantle convection', V.M. Goldschmidt Conference 2006, ed. Conference Program Committee, Elsevier, United Kingdom, pp. A333.
• Mallmann, G & O'Neill, H 2006, 'The redox control upon the rhenium crystal/silicate-melt partitioning', V.M. Goldschmidt Conference 2006, ed. Conference Program Committee, Elsevier, United Kingdom, pp. A386.
• Tailby, N, Mavrogenes, J, Hermann, J et al 2006, 'Solubility, activity and phase relationships in silicate - H₂O systems: Insights from new hydrothermal experimental techniques', V.M. Goldschmidt Conference 2006, ed. Conference Program Committee, Elsevier, United Kingdom, pp. A634.
• Berry, A, O'Neill, H, Hermann, J et al 2006, 'The infrared signature of water associated with trivalent cations in olivine', V.M. Goldschmidt Conference 2006, ed. Conference Program Committee, Elsevier, United Kingdom, pp. A49.
• Da Fonseca, R, Mallmann, G, O'Neill, H et al. 2006, 'An experimental study of the chalcophile character of Re: The effect of fO₂, fS₂ and temperature', V.M. Goldschmidt Conference 2006, ed. Conference Program Committee, Elsevier, United Kingdom, pp. A180.
• O'Neill, H & Liu, X 2006, 'The effect of H₂O on the spinel peridotite solidus', V.M. Goldschmidt Conference 2006, ed. Conference Program Committee, Elsevier, United Kingdom, pp. A458.
• Berry, A, O'Neill, H & Foran, G 2006, 'Electron exchange between V and Cr in silicate glasses', V.M. Goldschmidt Conference 2006, ed. Conference Program Committee, Elsevier, United Kingdom, pp. A48.
• Sinmyo, R, Hirose, K, O'Neill, H et al 2006, 'Ferric iron in Al-bearing post-perovskite', Geophysical Research Letters, vol. 33, pp. L12S13.
• O'Neill, H 2006, 'Free energy of formation of zircon and hafnon', American Mineralogist, vol. 91, pp. 1134-1141.
• O'Neill, H, Berry, A, McCammon, C et al 2006, 'An experimental determination of the effect of pressure on the Fe³⁺/ΣFe ratio of an anhydrous silicate melt to 3.0 GPa', American Mineralogist, vol. 91, pp. 404-412.
• Norman, M, McCulloch, M, O'Neill, H et al 2006, 'Magnesium isotopic analysis of olivine by laser-ablation multi-collector ICP-MS: composition dependent matrix effects and a comparison of the Earth and Moon', Journal of Analytical Atomic Spectrometry, vol. 21, pp. 50-54.
• O'Neill, H & Berry, A 2006, 'Activity coefficients at low dilution of CrO, NiO and CoO in melts in the system CaO-MgO-Al₂O₃-SiO₂ at 1400C: Using the thermodynamic behaviour of transition metal oxides in silicate melts to probe their structure', Chemical Geology, vol. 231, pp. 77-89.
• Golla-Schindler, U, O'Neill, H & Putnis, A 2005, 'Direct observation of spinodal decomposition in the magnetite-hercynite system by susceptibility measurements and transmission electron microscopy', American Mineralogist, vol. 90, pp. 1278-83.
• Witt-Eickschen, G & O'Neill, H 2005, 'The effect of temperature on the equilibrium distribution of trace elements between clinopyroxene, orthopyroxene, olivine and spinel in upper mantle peridotite', Chemical Geology, vol. 221, pp. 65-101.
• Hermann, J, O'Neill, H & Berry, A 2005, 'Titanium solubility in olivine in the system TiO₂-MgO-SiO₂: no evidence for an ultra-deep origin of Ti-bearing olivine', Contributions to Mineralogy and Petrology, vol. 148, pp. 746-760.
• O'Neill, H 2005, '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', American Mineralogist, vol. 90, pp. 497-501.
• Berry, A, Hermann, J, O'Neill, H et al 2005, 'Fingerprinting the water site in mantle olivine', Geology, vol. 33, no. 11, pp. 869-872.
• O'Neill, H, James, M, Dollase, W et al 2005, 'Temperature dependence of the cation distribution in CuAl2O4 spinel', European Journal of Mineralogy, vol. 17, pp. 581-6.
• O'Neill, H & Scott, D 2005, 'The free energy of formation of Mg2TiO4 (synthetic qandilite), an inverse spinel with configurational entropy', European Journal of Mineralogy, vol. 17, pp. 315-23.
• Liu, X & O'Neill, H 2004, 'Partial melting of spinel lherzolite in the system CaO�MgO�Al₂O₃�SiO₂�K₂O at 1.1 GPa', Journal of Petrology, vol. 45, no. 7, pp. 1339-1368.
• Jayasuriya, K, O'Neill, H, Berry, A et al 2004, 'A Mossbauer study of the oxidation state of Fe in silicate melts', American Mineralogist, vol. 89, pp. 1597-1609.
• Berry, A & O'Neill, H 2004, 'A XANES determination of the oxidation state of chromium in silicate glasses', American Mineralogist, vol. 89, no. 5-6, pp. 790-798.
• Palme, H & O'Neill, H 2004, 'Cosmochemical Estimates of Mantle Composition', in R.W. Carlson (ed.), Treatise on Geochemistry, Elsevier, Oxford, UK, pp. 1-38.
• Liu, X & O'Neill, H 2004, 'The effect of Cr₂O₃ on the partial melting of spinel lherzolite in the system CaO-MgO-Al₂O₃-SiO₂-Cr₂O₃ at 1.1 GPa', Journal of Petrology, vol. 45, no. 11, pp. 2261-2286.
• Wang, Z, Saxena, S, Lazor, P et al 2003, 'An in situ Raman spectroscopic study of pressure induced dissociation of spinel NiCr₂O₄', Journal of Physics and Chemistry of Solids, vol. 64, no. 3, pp. 425-431.
• Berry, A, Shelley, J, Foran, G et al 2003, 'A furnace design for XANES spectroscopy of silicate melts under controlled oxygen fugacities and temperatures to 1773 K', Journal of Synchrotron Radiation, vol. 10, no. 4, pp. 332-336.
• O'Neill, H, Redfern, S, Kesson, S et al 2003, 'An in situ neutron diffraction study of cation disordering in synthetic qandilite Mg₂TiO₄ at high temperatures', American Mineralogist, vol. 88, no. 5-6, pp. 860-865.
• O'Neill, H 2003, 'The influence of next nearest neighbours on cation radii in spinels: the example of the Co₃O₄ - CoCr₂O₄ solid solution', Mineralogical Magazine, vol. 67, no. 3, pp. 547-554.
• Berry, A, O'Neill, H, Jayasuriya, K et al 2003, 'XANES calibrations for the oxidation state of iron in a silicate glass', American Mineralogist, vol. 88, no. 7, pp. 967-977.
• O'Neill, H, Pownceby, M & McCammon, C 2003, 'The magnesiowustite: iron equilibrium and its implications for the activity-composition relations of (Mg,Fe)₂SiO₄ olivine solid solutions', Contributions to Mineralogy and Petrology, vol. 146, no. 3, pp. 308-325.
• Wang, Z, Schiferl, D, Zhao, Y et al 2003, 'High pressure Raman spectroscopy of spinel-type ferrite ZnFe₂O₄', Journal of Physics and Chemistry of Solids, vol. 64, pp. 2517-2523.
• O'Neill, H & Mavrogenes, J 2002, 'The sulfide capacity and the sulfur content at sulfide saturation of silicate melts at 1400Ë?C and 1 bar', Journal of Petrology, vol. 43, no. 6, pp. 1049-1087.
• Kesson, S, Fitzgerald, J, O'Neill, H et al. 2002, 'Partitioning of iron between magnesian silicate perovskite and magnesiowustite at about 1 Mbar', Physics of the Earth and Planetary Interiors, vol. 131, no. 3-4, pp. 295-310.
• Wang, Z, Lazor, P, Saxena, S et al 2002, 'High pressure Raman spectroscopy of ferrite MgFe₂O₄', Materials Research Bulletin, vol. 37, no. 9, pp. 1589-1602.
• Berry, A, O'Neill, H & Jayasuriya, K 2002, 'A Mossbauer and XANES spectroscopic study of Fe oxidation states in silicate glasses', Geochimica et Cosmochimica Acta, vol. 66, no. 15A, pp. A73-A73 Suppl. 1.
• Palme, H & O'Neill, H 2002, 'Meteorites and the composition of the earth', Geochimica et Cosmochimica Acta, vol. 66, no. 15A, pp. A578-A578 Suppl. 1.
• Wang, Z, O'Neill, H, Lazor, P et al 2002, 'High pressure Raman spectroscopic study of spinel MgCr₂O₄', Journal of Physics and Chemistry of Solids, vol. 63, no. 11, pp. 2057-2061.
• O'Neill, H & Eggins, S 2002, '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', Chemical Geology, vol. 186, no. 1-2, pp. 151-181.
• Ertel, W, O'Neill, H, Sylvester, P et al 2001, 'The solubility of rhenium in silicate melts: implications for the geochemical properties of rhenium at high temperatures', Geochimica et Cosmochimica Acta, vol. 65, no. 13, pp. 2161-2170.
• Matveev, S, O'Neill, H, King, I et al. 2001, 'Effect of silica activity on OH^- IR spectra of olivine: implications for low-aSiO₂ mantle metasomatism', Journal of Petrology, vol. 42, no. 4, pp. 721-729.
• McCammon, C, Griffin, W, Shee, S et al 2001, 'Oxidation during metasomatism in ultramafic xenoliths from the Wesselton kimberlite, South Africa: implications for the survival of diamond', Contributions to Mineralogy and Petrology, vol. 141, no. 3, pp. 287-296.
• Pownceby, M & O'Neill, H 2000, 'Thermodynamic data from redox reactions at high temperatures. VI. Thermodynamic properties of CoO-MnO solid solutions from emf measurements', Contributions to Mineralogy and Petrology, vol. 140, no. no 1, pp. 28-39.
• Klemme, S & O'Neill, H 2000, 'The effect of Cr on the solubility of Al in orthopyroxene: experiments and thermodynamic modelling', Contributions to Mineralogy and Petrology, vol. 140, no. no 1, pp. 84-98.
• Klemme, S & O'Neill, H 2000, 'The near-solidus transition from garnet lherzolite to spinel lherzolite', Contributions to Mineralogy and Petrology, vol. 138, no. no 3, pp. 237-248.
• Holzheid, A, Sylvester, P, O'Neill, H et al 2000, 'Evidence for a late chondritic veneer in the Earths mantle from high-pressure partitioning of palladium and platinum', Nature, vol. 406, no. no 6794, pp. 396-399.
• Grey, I, Madsen, I, Hibberson, W et al 2000, 'CaAl₁₂Si₄O₂₇, a New High-Pressure Phase Containing Al₆O₁₉ Clusters', Journal of Solid State Chemistry, vol. 153, no. no 2, pp. 391-397.
• Klemme, S, O'Neill, H, Schnelle, W et al. 2000, 'The heat capacity of MgCr₂O₄, FeCr₂O₄, and Cr₂O₃ at low temperatures and derived thermodynamic properties', American Mineralogist, vol. 85, no. no 11-12, pp. 1686-1693.
• Mavrogenes, J & O'Neill, H 1999, 'The relative effects of pressure, temperature and oxygen fugacity on the solubility of sulfide in mafic magmas', Geochimica et Cosmochimica Acta, vol. 63, pp. 1173-1180.

Projects and Grants

Grants information is drawn from ARIES. To add or update Projects or Grants information please contact your College Research Office.

• Understanding the Earth: a perspective from the science of advanced materials (Primary Investigator)
• Experimental investigation of the fractionation of Non-traditional stable isotopes by planetary processes (Primary Investigator)
• Deep time in deep Earth: using the relationship between trace elements and transport properties to constrain deep Earth processes (Primary Investigator)