Skip to main content


(underlined – student/ post-doc author)


Mangler, M.F., Humphreys, M.C.S., Geifman, E., Iveson, A.A., Wadsworth, F.B., Lindoo, A., Brooker, R.A, & Hammond, K. Thermodynamic and kinetic controls on euhedral crystal growth in silicate melts. (2023) Journal of Petrology (in revision)



61. Bretagne, E., Wadsworth, F.B., Vasseur, J., Humphreys, M.C.S., Dingwell, D.B., Dobson, K.J., Mangler, M.F. & Rooyakkers, S. (2023) The permeability of loose magma mush. Geology,

60. Tegner, C., Salmonsen, L.P., Holness, M.B., Lesher, C.E., Humphreys, M.C.S., Thy, P. & Nielsen, T.F.D. (2023) A whole rock dataset for the Skaergaard intrusion, East Greenland. GEUS Bulletin 53, and


59. Cassidy, M., Iveson, A.A., Humphreys, M.C.S., Mather, T.A., Helo, C., Castro, J.M., Ruprecht, P., Pyle, D.M. & EIMF. (2022) Experimentally derived F, Cl and Br fluid/melt partitioning of intermediate to silicic melts in magmatic systems. American Mineralogist 107 (10), 1825-1839,

58. Iveson, A.A., Humphreys, M.C.S., Jenner, F.E., Kunz, B.E., Savov, I.P., de Hoog, J.C.M., Churikova, T.G., Gordeychik, B.N., Hammond, S.J., Plechov, P.Yu., Blundy, J. & Agostini, S. (2022) Tracing volatiles, halogens, and the chalcophile metals during melt evolution at the Tolbachik monogenetic field, Kamchatka. Journal of Petrology 63 (9), egac087,

57. Mangler, M.F., Humphreys, M.C.S., Wadsworth, F.B., Iveson, A.A. & Higgins, M.D. (2022) Variation of plagioclase shape with size in intermediate magmas: a window into incipient plagioclase crystallisation. Contributions to Mineralogy and Petrology 177 (6): 64

56. Sokoƚ, K., Finch, A.A., Hutchison, W., Cloutier, J., Borst, A.M. & Humphreys, M.C.S. (2022) Quantifying metasomatic HFSE-HREE transport from alkaline magmas. Geology 50 (3): 305-310

55. Stow, M.A., Prytulak, J., Humphreys, M.C.S. & Nowell, G.M. (2022) Integrated petrological and Fe-Zn isotopic modelling of plutonic differentiation. Geochimica et Cosmochimica Acta 320: 366-391

54. Holness, M.B., Humphreys M.C.S., Namur, O., Tegner, C. & Nielsen, T. (2022) Crystallisation on a steep wall the Marginal Border Series of the Skaergaard Intrusion, East Greenland. Journal of Petrology 63, 1-21,


53. Humphreys, M.C.S., Smith, V.C., Coumans, J.P., Riker, J.M., Stock, M.J., de Hoog, J.C.M. & Brooker, R.A. (2021) Rapid pre-eruptive mush reorganisation and atmospheric volatile emissions from the 12.9 ka Laacher See eruption, determined using apatite. Earth and Planetary Science Letters 576, 117198

52. Iveson, A.A., Humphreys, M.C.S., Savov, I.P., de Hoog, J.C.M., Turner, S.J., Churikova, T.G., Macpherson, C.G., Mather, T.A., Gordeychik, B.N., Tomanikova, L., Agostini, S., Hammond, K., Pyle, D.M. & Cooper, G.F. (2021) Deciphering variable mantle sources and hydrous inputs to arc magmas in Kamchatka. Earth and Planetary Science Letters 562, 116848


51. Blundy, J., Melekhova, E., Ziberna, L., Humphreys, M.C.S., Cerantola, V., Brooker, R.A., McCammon, C.A., Pichavant, M. & Ulmer, P. (2020) Effect of redox on Fe-Mg-Mn exchange between olivine and melt and an oxybarometer for basalts. Contributions to Mineralogy and Petrology 175: 103

50. Coumans, J.P., Llewellin, E.W., Wadsworth, F.B., Humphreys, M.C.S., Mathias, S.A., Yelverton, B.M. & Gardner, J.E. (2020) An experimentally validated numerical model for bubble growth in magma. Journal of Volcanology & Geothermal Research, 107002

49. Coumans, J.P., Llewellin, E.W., Humphreys, M.C.S., Nowak, M., Brooker, R.A., Mathias, S.A. & McIntosh, I.M. (2020). An experimentally-validated numerical model of diffusion and speciation of water in rhyolitic silicate melt. Geochimica et Cosmochimica Acta 276, 219-238


48. Cooper, G.F., Blundy, J.D., Macpherson, C.G., Humphreys, M.C.S. & Davidson, J.P. (2019). Evidence from plutonic xenoliths for magma differentiation, mixing and storage of crystal mush beneath St Eustatius, Lesser Antilles. Contributions to Mineralogy and Petrology 174: 39

47. Humphreys, M.C.S., Zhang, J., Cooper, G.F., Macpherson, C.G. & Ottley, C.J. (2019) Identifying the ingredients of hydrous arc magmas: insights from Mt Lamington, Papua New Guinea. Philosophical Transaction of the Royal Society, A 377, 20180018

46. Humphreys, M.C.S., Cooper, G.F., Zhang, J., Loewen, M., Kent, A.J.R., Macpherson, C.G. & Davidson, J.P. (2019) Unravelling the complexity of magma plumbing at Mount St. Helens: a new trace element partitioning scheme for amphibole. Contributions to Mineralogy and Petrology 174: 9


45. Namur, O. & Humphreys, M.C.S. (2018) Trace element constraints on the differentiation and crystal mush solidification in the Skaergaard intrusion, Greenland. Journal of Petrology 59, 387-418

44. Stock, M.J., Humphreys, M.C.S., Smith, V.C., Isaia, R., Brooker, R.A. & Pyle, D.M. (2018) Tracking volatile behaviour in sub-volcanic plumbing systems using apatite and glass: Insights into pre-eruptive processes at Campi Flegrei, Italy. Journal of Petrology 59, 2463-2492

43. Plail, M., Edmonds, M., Woods, A., Barclay, J., Humphreys, M.C.S., Herd, R.A. & Christopher, T. Mafic enclaves record syn-eruptive basalt intrusion and mixing. Earth and Planetary Science Letters 484, 30-40

42. Riker, J.M., Humphreys, M.C.S., Brooker, R.A., de Hoog, C.J. & EIMF. (2018) First measurements of OH-C exchange and T-dependent partitioning of OH and halogens in the system apatite – silicate melt. American Mineralogist 183, 260-270


41. Zhang, J., Humphreys, M.C.S., Cooper, G.F., Davidson, J.P. & Macpherson, C.G. (2017) Magma mush chemistry at subduction zones, revealed by new melt major element inversion from calcic amphiboles. American Mineralogist 102, 1353-1367


40. Edmonds, M., Kohn, S.C., Hauri, E.H., Humphreys, M.C.S. & Cassidy, M. (2016) Extensive, water-rich magma reservoir beneath southern Montserrat. Lithos 252-253, 216-233

39. Stock, M.J., Humphreys, M.C.S., Smith, V.C., Isaia, R. & Pyle, D. (2016) Late-stage volatile saturation as a potential trigger for explosive volcanic eruptions. Nature Geoscience 9, 249-255

38. Humphreys, M.C.S., Kloecking, M.S. & Edmonds, M. (2016). Interrogating the validity of plagioclase-melt geothermometry for decompression-driven magma ascent. American Mineralogist 101, 769-779


37. Zhang, J., Davidson, J.P., Humphreys, M.C.S., Macpherson, C.G. & Neill, I. (2015). Petrology and geochemistry of magmatic enclaves and andesitic hosts from Mt. Lamington, Papua New Guinea: Implications for recycling earlier-fractionated minerals through magma recharge. Journal of Petrology 11, 2223-2256

36. Scott, J.A., Humphreys, M.C.S., Mather, T.A., Pyle, D.M. & Stock, M.J. (2015). Insights into the behaviour of S, F and Cl and Santiaguito Volcano, Guatemala, from apatite and glass. Lithos 232, 375-394

35. Riker, J.M., Blundy, J.D., Rust, A.C., Botcharnikov, R.E. & Humphreys, M.C.S. (2015). Experimental phase equilibria of a Mount St. Helens rhyodacite: A framework for interpreting crystallization paths in degassing silicic magmas. Contributions to Mineralogy and Petrology 170, 6, DOI 10.1007/s00410-015-1160-5

34. Humphreys, M.C.S., Brooker, R.A., Fraser, D.G., Burgisser, A., Mangan, M.T. & McCammon, C. (2015) Coupled interactions between volatile activity and Fe oxidation state during arc crustal processes. Journal of Petrology 56, 795-814

33. Humphreys, M.C.S., Edmonds, M., Christopher, T. & Hards, V. (2015) Discussion on ‘Magma storage region processes of the Soufrière Hills Volcano, Montserrat’, Geological Society, London, Memoirs, 39, 361-381. Journal of the Geological Society, doi: 10.1144/jgs2014-140

32. Melekhova, E., Blundy, J.D., Robertson, R. & Humphreys, M.C.S. (2015) Experimental evidence for polybaric differentiation of primitive arc basalt beneath St. Vincent, Lesser Antilles. Journal of Petrology 56, 161-192

31. Stock, M.J., Humphreys, M.C.S., Smith, V.C., Johnson, R.D. & Pyle, D.M. (2014). New constraints on electron-beam induced halogen migration in apatite. American Mineralogist 100, 281-293


30. Edmonds, M., Brett, A., Herd, R.A., Humphreys, M.C.S. & Woods, A. (2014) Magnetite-bubble aggregates at mixing interfaces in andesite magma bodies. Geological Society of London Special Publication 410, SP410-7

29. Bufe, N.A.B., Holness, M.B. & Humphreys, M.C.S. (2014) Contact metamorphism of Precambrian gneiss by the Skaergaard Intrusion. Journal of Petrology 55, 1595-1617

28. McIntosh, I., Llewellin, E., Humphreys, M.C.S., Burgisser, A., Schipper, I. & Nichols, A. (2014) Distribution of dissolved water in magmatic glass records growth and resorption of bubbles. Earth and Planetary Science Letters 401, 1-11

27. Namur, O.Humphreys, M.C.S. & Holness, M.B. (2014) Crystallization of interstitial liquid and latent heat buffering in solidifying gabbros: Skaergaard Intrusion, Greenland. Journal of Petrology 55, 1389-1427

26. Christopher, T., Humphreys, M.C.S., Barclay, J., Genareau, K., H. de Angelis, S., Plail, M. & Donovan, A. (2014) Petrological and geochemical variation during the Soufrière Hills eruption, 1995-2010. In: G. Wadge, R. Robertson, B. Voight (eds) The eruption of Soufrière Hills Montserrat from 2000 to 2010. Geological Society of London Memoir 39, 317-342

25. Edmonds, M., Humphreys, M.C.S., Hauri, E.H., Herd, R.A., Wadge, G., Rawson, H., Ledden, R., Plail, M., Barclay, J., Aiuppa, A., Christopher, T., Giudice, G. & Guida, R. (2014). Pre-eruptive vapour and its role in controlling eruption style and longevity at Soufrière Hills Volcano. In: G. Wadge, R. Robertson, B. Voight (eds) The eruption of Soufrière Hills Montserrat from 2000 to 2010. Geological Society of London Memoir 39, 291-315

24. Plail, M., Barclay, J., Humphreys, M.C.S., Edmonds, M., Herd, R.A. & Christopher, T.E. (2014). Characterization of mafic enclaves in the erupted products of Soufrière Hills Volcano, Montserrat, 2009-2010. In: G. Wadge, R. Robertson, B. Voight (eds) The eruption of Soufrière Hills Montserrat from 2000 to 2010. Geological Society of London Memoir 39, 343-360

23. Stamper, C., Melekhova, E., Blundy, J.D., Arculus, R.J., Brooker, R.A. & Humphreys, M.C.S. (2014). Oxidised phase relations of a primitive basalt from Grenada, Lesser Antilles. Contributions to Mineralogy & Petrology 167, 954

22. Plail, M., Edmonds, M., Humphreys, M.C.S., Barclay, J. & Herd, R.A. (2014). Geochemical evidence for relict degassing pathways preserved in andesite. Earth and Planetary Science Letters 386, 21-33


21. Phillips, J.C., Humphreys, M.C.S., Daniels, K.A., Brown, R.J. & Witham, F. (2013). Columnar joints produced by cooling in basalt. Bulletin of Volcanology 75, 715 (DOI 10.1007/s00445-013-0715-4)

20. Namur, O.Humphreys, M.C.S. & Holness, M.B. (2013). Lateral reactive infiltration in a vertical gabbroic crystal mush, Skaergaard Intrusion, East Greenland. Journal of Petrology 54, 985-1016

19. Humphreys, M.C.S., Edmonds, M., Plail, M., Barclay, J., Parkes, D. & Christopher, T. (2013). A new method to quantify the real supply of mafic components to a hybrid andesite. Contributions to Mineralogy and Petrology 165, 191-215


18. Holness, M.B., Humphreys, M.C.S., Sides, R., Helz, R.T. & Tegner, C. (2012). Towards an understanding of disequilibrium dihedral angles in mafic rocks. Journal of Geophysical Research 117, B06207, doi:10.1029/2011/JB008902


17. Holness, M.B., Stripp, G.R., Humphreys, M.C.S., Veksler, I. & Nielsen, T.F.D. (2011). Silicate liquid immiscibility within the crystal mush: Late-stage magmatic microstructures in the Skaergaard Intrusion, East Greenland. Journal of Petrology 52, 175-222

16. Humphreys, M.C.S. (2011). Silicate liquid immiscibility within the crystal mush: Evidence from Ti in plagioclase from the Skaergaard Intrusion. Journal of Petrology 52, 147-174


15. Humphreys, M.C.S. & Holness, M.B. (2010). Melt-rich segregations in the Skaergaard Marginal Border Series: Tearing of a vertical silicate mush. Lithos 119, 181-192

14. Edmonds, M., Aiuppa, A., Humphreys, M., Moretti, R., Guidice, G., Martin, R.S., Herd, R.A. & Christopher, T. (2010). Excess volatiles supplied by mingling of mafic magma at an andesite arc volcano. G-cubed 11, Q04005

13. Humphreys, M.C.S., Edmonds, M., Christopher, T. & Hards, V. (2010). Magma hybridisation and diffusive exchange recorded in heterogeneous glasses from Soufrière Hills Volcano, Montserrat. Geophysical Research Letters 37, L00E06

12. Christopher, T., Edmonds, M., Humphreys, M.C.S. & Herd, R.A. (2010). Volcanic gas emissions from Soufrière Hills Volcano, Montserrat 1995-2009, with implications for mafic magma supply and degassing. Geophysical Research Letters 37, L00E04


11. Humphreys, M.C.S., Edmonds, M, Christopher, T. & Hards, V. (2009). Chlorine variations in the magma of Soufrière Hills Volcano, Montserrat: Insights from Cl in amphibole. Geochimica et Cosmochimica Acta 73, 5693-5708

10. Humphreys, M.C.S. (2009). Chemical evolution of intercumulus liquid, as recorded in plagioclase overgrowth rims from the Skaergaard Intrusion. Journal of Petrology 50, 127-145

9. Humphreys, M.C.S., Christopher, T. & Hards, V. (2009). Microlite transfer by disaggregation of mafic inclusions following magma mixing at Soufrière Hills Volcano, Montserrat. Contributions to Mineralogy and Petrology 157, 609-624


8. Sparks, R.S.J., Folkes, C.B., Humphreys, M.C.S., Barford, D., Clavero, J., Mayel, S., McNutt, S. & Pritchard, M. (2008). Uturuncu volcano, Bolivia: Volcanic unrest due to mid-crustal magma intrusion. American Journal of Science, 308, 727-769 [24]

7. Humphreys, M.C.S., Menand, T., Blundy, J.D., Klimm, K. (2008) Magma ascent rates in explosive eruptions: Constraints from H2O diffusion in melt inclusions. Earth and Planetary Science Letters, 270, 25-40 [18]

6. Humphreys, M.C.S., Blundy, J.D. & Sparks, R.S.J. (2008). Shallow-level decompression crystallisation and deep magma supply at Shiveluch Volcano. Contributions to Mineralogy and Petrology, 155, 45-61


5. Blundy, J., Cashman, K. & Humphreys, M. (2006). Magma heating by decompression-driven crystallisation beneath andesite volcanoes. Nature, 443, 76-80 [111]

4. Humphreys, M.C.S., Blundy, J.D. & Sparks, R.S.J. (2006). Magma evolution and open system processes at Shiveluch Volcano: Insights from phenocryst zoning. Journal of Petrology, 47, 2303-2334. [54]

3. Dirksen, O., Humphreys, M.C.S., Pletchov, P., Melnik, O., Demyanchuk, Y., Sparks, R.S.J. & Mahony, S. (2006). The 2001-2004 dome-forming eruption of Shiveluch Volcano, Kamchatka: Observation, petrological investigation and numerical modelling. Journal of Volcanology and Geothermal Research, 155, 201-226 [26]

2. Humphreys, M.C.S., Kearns, S., Blundy, J.D. (2006). SIMS investigation of electron-beam damage to hydrous glasses. American Mineralogist, 91, 667-679


1. Holness, M.B. and Humphreys, M.C.S. (2003). The Traigh Bhàn na Sgùrra sill, Isle of Mull: Flow localisation in a major magma conduit. Journal of Petrology, 44, 1961-1976