Staff profile

My research is in petrology, volcanology and magmatism, with a focus on understanding processes of magma storage, metal enrichment, geochemical evolution and migration within the crust using both natural materials and experimental approaches. My current research interests (i) use crystal textures to understand and quantify magma solidification and the physical behaviour of crystal mushes; (ii) focus on volatiles in volcanic processes, including the timing of magmatic fluid exsolution; and (iii) define the enrichment and depletion of metals during granite solidification and alteration. 

Current and recent research projects include:

• using crystal textures combined with apatite geochemistry to interpret crystal mush behaviour in the lead-up to big eruptions (ERC Consolidator; PI)
• using plagioclase crystal textures to understand mush processes (NERC; PI)
• effects of sintering on transitions in volcanic eruptive behaviour (NERC; Co-I) 
• metal enrichment and depletion during hydrothermal alteration of granites
• defining speciation and structural environments for metals and volatiles complexes in silicate melts (in collaboration with Alex Iveson; Leverhulme Early Career Fellowship)
• using apatite volatile geochemistry to interpret the formation conditions for porphyry copper mineralising systems

We have a very active volcanology-petrology group in Durham. Currently working in the group with me are Dr Amanda Lindoo, who is working on crystal shape in plagioclase, and Dr David Colby, who is working on the behaviour of volatiles in apatite. 

Current PhD students include Gemma Brown, who is working on apatite volatile geochemistry in the Canary islands; Katie Schofield, who is working on crystal textures and chemistry in plutonic rocks from the Adamello batholith, and Ella Richmond, who is investigating lithium enrichment and mobilisation in granites. I also co-supervise Emily Jones (University of St Andrews, primary supervisor Will McCarthy) working on crystal mush properties at Illimaussaq, Greenland, and co-supervise Louis Chambers (Durham, MScR) on zoned pumice falls in southern Tenerife (primary supervisor Rich Brown).

Recent postdoctoral researchers include Dr Brenna Halverson, Dr Martin Mangler (now at University of Southampton), Dr Alex Iveson, now at PPNL (USA), and Dr Charline Lormand (now at University of Geneva). Recent postgraduate students include Rebecca ughes (MScR; currently studying for a PhD at University of Manchester), Will Nicholson (MScR), Dr Annabelle Foster, who studied sintering in obsidian, Dr Ceri Allgood (now at University of Lancaster), who worked on dyke propagation and flow, Dr Madeleine Stow, who worked on transition metal stable isotope fractionation in granites (primary supervisor Julie Prytulak); and Dr Kris Sokól (St Andrews) who worked on fenite alteration around alkaline intrusions (primary supervisor Adrian Finch).

I am always happy to hear from potential graduate students or post-docs interested in developing projects at Durham.

• 2020 - 2024: Associate Editor, Journal of Petrology:
• 2019: Wager Medal, IAVCEI:
• 2017: Editorial board member, Geology:
• 2012: Max Hey medal, Mineralogical Society of Great Britain:
• 2008: President's Award, Geological Society of London:

Chapter in book

• Pre-eruptive vapour and its role in controlling eruption style and longevity at Soufriere Hills Volcano
  
  Edmonds, M., Humphreys, M., Hauri, E., Herd, R., 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 Soufriere Hills Volcano. In G. Wadge, R. Robertson, & B. Voight (Eds.), The eruption of Soufrière Hills Volcano, Montserrat from 2000 to 2010. (pp. 291-315). Geological Society. https://doi.org/10.1144/m39.16
• Petrological and geochemical variation during the Soufrière Hills eruption, 1995 to 2010
  
  Christopher, T., Humphreys, M., Barclay, J., Genareau, K., De Angelis, S., Plail, M., & Donovan, A. (2014). Petrological and geochemical variation during the Soufrière Hills eruption, 1995 to 2010. In G. Wadge, R. Robertson, & B. Voight (Eds.), The Eruption of Soufrière Hills Volcano, Montserrat from 2000 to 2010. (pp. 317-342). Geological Society. https://doi.org/10.1144/m39.17
• Characterization of mafic enclaves in the erupted products of Soufrière Hills Volcano, Montserrat, 2009 to 2010
  
  Plail, M., Barclay, J., Humphreys, M., Edmonds, M., Herd, R., & Christopher, T. (2014). Characterization of mafic enclaves in the erupted products of Soufrière Hills Volcano, Montserrat, 2009 to 2010. In G. Wadge, R. Robertson, & B. Voight (Eds.), The eruption of Soufrière Hills Volcano, Montserrat from 2000 to 2010. (pp. 343-360). Geological Society. https://doi.org/10.1144/m39.18

Conference Paper

• Exploring for hydrogen, helium and lithium: is it as easy as 1, 2, 3?
  
  Gluyas, J., Humphreys, M., Karolytė, R., Cheng, A., Sherwood, B., & Ballentine, C. (2025). Exploring for hydrogen, helium and lithium: is it as easy as 1, 2, 3? In C. Gill, G. Goffey, & J. Underhill (Eds.), Powering the Energy Transition through Subsurface Collaboration: Proceedings of the 1st Energy Geoscience Conference. https://doi.org/10.1144/egc1-2024-13

Journal Article

• Sintering dynamics of fine-grained rhyolitic obsidian particles from Hrafntinnuhryggur (Krafla, Iceland) with implications for silicic volcanic eruptions
  
  Foster, A., Wadsworth, F., Vasseur, J., Humphreys, M., Tuffen, H., Dingwell, D., & Dobson, K. (2025). Sintering dynamics of fine-grained rhyolitic obsidian particles from Hrafntinnuhryggur (Krafla, Iceland) with implications for silicic volcanic eruptions. Journal of Volcanology and Geothermal Research, 467, Article 108330. https://doi.org/10.1016/j.jvolgeores.2025.108330
• A general model for the permeability of magma mush
  
  Bretagne, E., Wadsworth, F. B., Vasseur, J., Schofield, K., Humphreys, M., & Dobson, K. J. (2025). A general model for the permeability of magma mush (No. e2025GC012461). 26(9), Article e2025GC012461. https://doi.org/10.1029/2025GC012461
• Silica substituted carbonate apatite: synthesis and analytical challenges
  
  Anenburg, M., Chen, J., Gardiner, M., de Hoog, J., Humphreys, M., Missen, O., Mills, S., & Pasic, B. (2025). Silica substituted carbonate apatite: synthesis and analytical challenges. Journal of Materials Chemistry B, 13(32), 9968-9981. https://doi.org/10.1039/D5TB01061F
• Microstructures reveal mechanical compaction and volatile-rich liquid migration in the layered alkaline Ilímaussaq complex, South Greenland
  
  Jones, E., McCarthy, W., Piazolo, S., Magee, C., Humphreys, M., & Hutchison, W. (2025). Microstructures reveal mechanical compaction and volatile-rich liquid migration in the layered alkaline Ilímaussaq complex, South Greenland. Journal of Petrology, 66(8), Article egaf067. https://doi.org/10.1093/petrology/egaf067
• Crystal mush processes and crustal magmatism
  
  Humphreys, M. C. S., Namur, O., Bohrson, W. A., Bouilhol, P., Cooper, G. F., Cooper, K. M., Huber, C., Lissenberg, C. J., Morgado, E., & Spera, F. J. (2025). Crystal mush processes and crustal magmatism. Nature Reviews Earth & Environment, 6, 401-416. https://doi.org/10.1038/s43017-025-00682-x
• Igneous layering and magma dynamics in alkaline intrusions: textural evidence for gravitational settling and compaction within cumulates
  
  Jones, E., McCarthy, W., Magee, C., Mattsson, T., Piazolo, S., Hutchison, W., & Humphreys, M. C. (2025). Igneous layering and magma dynamics in alkaline intrusions: textural evidence for gravitational settling and compaction within cumulates. Journal of the Geological Society, 182(4), Article 181. https://doi.org/10.1144/jgs2024-181
• Magmatic initial and saturated water thresholds determine copper endowments: Insights from apatite F-Cl-OH compositions
  
  Sun, Y., Zhou, Q., Wang, R., & Humphreys, M. C. (2025). Magmatic initial and saturated water thresholds determine copper endowments: Insights from apatite F-Cl-OH compositions. Geoscience Frontiers, 16(1), Article 101962. https://doi.org/10.1016/j.gsf.2024.101962
• Vanadium isotope fractionation during plutonic differentiation and implications for the isotopic composition of the upper continental crust
  
  Stow, M. A., Prytulak, J., Humphreys, M. C., Hammond, S. J., & Nowell, G. M. (2024). Vanadium isotope fractionation during plutonic differentiation and implications for the isotopic composition of the upper continental crust. Earth and Planetary Science Letters, 643, Article 118825. https://doi.org/10.1016/j.epsl.2024.118825
• Crystal resorption as a driver for mush maturation: an experimental investigation
  
  Mangler, M. F., Humphreys, M. C. S., Iveson, A. A., Cooper, K. M., Clynne, M. A., Lindoo, A., Brooker, R. A., & Wadsworth, F. B. (2024). Crystal resorption as a driver for mush maturation: an experimental investigation. Journal of Petrology, 65(9), Article egae088. https://doi.org/10.1093/petrology/egae088
• Abrupt climate change at the MIS 5/4 transition recorded in a speleothem from the Eastern Mediterranean
  
  Paine, A. R., Baldini, J. U., Ünal-İmer, E., Wadsworth, F. B., Iveson, A. A., Humphreys, M. C., Brown, R. J., Müller, W., & Ottley, C. J. (2024). Abrupt climate change at the MIS 5/4 transition recorded in a speleothem from the Eastern Mediterranean. Quaternary Science Reviews, 339, Article 108841. https://doi.org/10.1016/j.quascirev.2024.108841
• Evidence for the formation of silicic lava by pyroclast sintering
  
  Foster, A., Wadsworth, F. B., Tuffen, H., Unwin, H. E., & Humphreys, M. C. S. (2024). Evidence for the formation of silicic lava by pyroclast sintering. Nature Communications, 15(1), 5347. https://doi.org/10.1038/s41467-024-49601-6
• Volatile budgets and evolution in porphyry-related magma systems, determined using apatite
  
  Lormand, C., Humphreys, M. C., Colby, D. J., Coumans, J. P., Chelle-Michou, C., & Li, W. (2024). Volatile budgets and evolution in porphyry-related magma systems, determined using apatite. Lithos, 480-481, Article 107623. https://doi.org/10.1016/j.lithos.2024.107623
• Banding in the Margins of Basaltic Dykes Indicates Pulsatory Propagation During Emplacement
  
  Allgood, C., Llewellin, E. W., Humphreys, M. C. S., Mathias, S. A., Brown, R. J., & Vye‐Brown, C. (2024). Banding in the Margins of Basaltic Dykes Indicates Pulsatory Propagation During Emplacement. Journal of Geophysical Research: Solid Earth, 129(4), Article e2023JB028007. https://doi.org/10.1029/2023jb028007
• The permeability of loose magma mush
  
  Bretagne, E., Wadsworth, F. B., Vasseur, J., Humphreys, M. C., Dingwell, D. B., Dobson, K. J., Mangler, M. F., & Rooyakkers, S. M. (2023). The permeability of loose magma mush. Geology, 51(9), 829-832. https://doi.org/10.1130/g51133.1
• Melt diffusion-moderated crystal growth and its effect on euhedral crystal shapes
  
  Mangler, M. F., Humphreys, M. C. S., Geifman, E., Iveson, A. A., Wadsworth, F. B., Brooker, R. A., Lindoo, A., & Hammond, K. (2023). Melt diffusion-moderated crystal growth and its effect on euhedral crystal shapes. Journal of Petrology, 64(8). https://doi.org/10.1093/petrology/egad054
• Tracing Volatiles, Halogens, and Chalcophile Metals during Melt Evolution at the Tolbachik Monogenetic Field, Kamchatka
  
  Iveson, A. A., Humphreys, M. C., Jenner, F. E., Kunz, B. E., Savov, I. P., De Hoog, J. C., Churikova, T. G., Gordeychik, B. N., Hammond, S. J., Plechov, P. Y., Blundy, J., & Agostini, S. (2022). Tracing Volatiles, Halogens, and Chalcophile Metals during Melt Evolution at the Tolbachik Monogenetic Field, Kamchatka. Journal of Petrology, 63(9). https://doi.org/10.1093/petrology/egac087
• Variation of plagioclase shape with size in intermediate magmas: a window into incipient plagioclase crystallisation
  
  Mangler, M. F., Humphreys, M. C., Wadsowrth, 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), Article 64. https://doi.org/10.1007/s00410-022-01922-9
• Integrated Petrological and Fe-Zn Isotopic Modelling of Plutonic Differentiation
  
  Stow, M. A., Prytulak, J., Humphreys, M. C., & Nowell, G. M. (2022). Integrated Petrological and Fe-Zn Isotopic Modelling of Plutonic Differentiation. Geochimica et Cosmochimica Acta, 320, 366-391. https://doi.org/10.1016/j.gca.2021.12.018
• Experimentally-derived F, Cl and Br fluid/melt partitioning of intermediate to silicic melts in magmatic systems
  
  Cassidy, M., Iveson, A., Humphreys, M., Mather, T., Helo, C., Castro, J., Ruprecht, P., Pyle, D., & 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. https://doi.org/10.2138/am-2022-8109
• Quantifying metasomatic high-field-strength and rare-earth element transport from alkaline magmas
  
  Sokół, K., Finch, A. A., Hutchison, W., Cloutier, J., Borst, A. M., & Humphreys, M. C. (2022). Quantifying metasomatic high-field-strength and rare-earth element transport from alkaline magmas. Geology, 50(3), 305-310. https://doi.org/10.1130/g49471.1
• Crystal mush growth and collapse on a steep wall: the Marginal Border Series of the Skaergaard Intrusion, East Greenland
  
  Holness, M. B., Humphreys, M. C., Namur, O., Andersen, J., Tegner, C., & Nielsen, T. (2022). Crystal mush growth and collapse on a steep wall: the Marginal Border Series of the Skaergaard Intrusion, East Greenland. Journal of Petrology, 63(1). https://doi.org/10.1093/petrology/egab100
• Rapid pre-eruptive mush reorganisation and atmospheric volatile emissions from the 12.9 ka Laacher See eruption, determined using apatite
  
  Humphreys, M. C., Smith, V. C., Coumans, J. P., Riker, J. M., Stock, M. J., de Hoog, J., & 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, Article 117198. https://doi.org/10.1016/j.epsl.2021.117198
• Deciphering variable mantle sources and hydrous inputs to arc magmas in Kamchatka
  
  Iveson, A. A., Humphreys, M. C., Savov, I. P., de Hoog, J. C., 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. https://doi.org/10.1016/j.epsl.2021.116848
• Effect of redox on Fe–Mg–Mn exchange between olivine and melt and an oxybarometer for basalts
  
  Blundy, J., Melekhova, E., Ziberna, L., Humphreys, M. C., 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(11), Article 103. https://doi.org/10.1007/s00410-020-01736-7
• An experimentally validated numerical model for bubble growth in magma
  
  Coumans, J., Llewellin, E., Wadsworth, F., Humphreys, M., Mathias, S., Yelverton, B., & Gardner, J. (2020). An experimentally validated numerical model for bubble growth in magma. Journal of Volcanology and Geothermal Research, 402, Article 107002. https://doi.org/10.1016/j.jvolgeores.2020.107002
• An experimentally-validated numerical model of diffusion and speciation of water in rhyolitic silicate melt
  
  Coumans, J. P., Llewellin, E. W., Humphreys, M. C., 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. https://doi.org/10.1016/j.gca.2020.02.026
• Evidence from plutonic xenoliths for magma differentiation, mixing and storage in a volatile-rich crystal mush beneath St. Eustatius, Lesser Antilles
  
  Cooper, G. F., Blundy, J. D., Macpherson, C. G., Humphreys, M. C., & Davidson, J. P. (2019). Evidence from plutonic xenoliths for magma differentiation, mixing and storage in a volatile-rich crystal mush beneath St. Eustatius, Lesser Antilles. Contributions to Mineralogy and Petrology, 174(5), Article 39. https://doi.org/10.1007/s00410-019-1576-4
• Identifying the ingredients of hydrous arc magmas: insights from Mt Lamington, Papua New Guinea
  
  Humphreys, M., Zhang, J., Cooper, G., Macpherson, C., & Ottley, C. (2019). Identifying the ingredients of hydrous arc magmas: insights from Mt Lamington, Papua New Guinea. Philosophical Transactions of the Royal Society of London A: Mathematical, Physical and Engineering Sciences., 377(2139), Article 20180018. https://doi.org/10.1098/rsta.2018.0018
• Unravelling the complexity of magma plumbing at Mount St. Helens: a new trace element partitioning scheme for amphibole
  
  Humphreys, M. C., Cooper, G. F., Zhang, J., Loewen, M., Kent, A. J., 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(1), Article 9. https://doi.org/10.1007/s00410-018-1543-5
• Tracking volatile behaviour in sub-volcanic plumbing systems using apatite and glass: insights into pre-eruptive processes at Campi Flegrei, Italy
  
  Stock, M. J., Humphreys, M. C., 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(12), 2463-2492. https://doi.org/10.1093/petrology/egy020
• Trace element constraints on the differentiation and crystal mush solidification in the Skaergaard intrusion, Greenland
  
  Namur, O., & Humphreys, M. C. (2018). Trace element constraints on the differentiation and crystal mush solidification in the Skaergaard intrusion, Greenland. Journal of Petrology, 59(3), 387-418. https://doi.org/10.1093/petrology/egy032
• Mafic enclaves record syn-eruptive basalt intrusion and mixing
  
  Plail, M., Edmonds, M., Woods, A., Barclay, J., Humphreys, M. C., Herd, R. A., & Christopher, T. (2018). Mafic enclaves record syn-eruptive basalt intrusion and mixing. Earth and Planetary Science Letters, 484, 30-40. https://doi.org/10.1016/j.epsl.2017.11.033
• First measurements of OH-C exchange and temperature-dependent partitioning of OH and halogens in the system apatite - silicate melt
  
  Riker, J., Humphreys, M., Brooker, R., de Hoog, J., & EIMF. (2018). First measurements of OH-C exchange and temperature-dependent partitioning of OH and halogens in the system apatite - silicate melt. American Mineralogist, 103(2), 260-270. https://doi.org/10.2138/am-2018-6187ccby
• Magma mush chemistry at subduction zones, revealed by new melt major element inversion from calcic amphiboles
  
  Zhang, J., Humphreys, M., Cooper, G., Davidson, J., & Macpherson, C. (2017). Magma mush chemistry at subduction zones, revealed by new melt major element inversion from calcic amphiboles. American Mineralogist, 102(6), 1353-1367. https://doi.org/10.2138/am-2017-5928
• Extensive, water-rich magma reservoir beneath southern Montserrat
  
  Edmonds, M., Kohn, S., Hauri, E., Humphreys, M., & Cassidy, M. (2016). Extensive, water-rich magma reservoir beneath southern Montserrat. Lithos, 252-253, 216-233. https://doi.org/10.1016/j.lithos.2016.02.026
• The validity of plagioclase-melt geothermometry for degassing-driven magma crystallization
  
  Humphreys, M., Edmonds, M., & Kloecking, M. (2016). The validity of plagioclase-melt geothermometry for degassing-driven magma crystallization. American Mineralogist, 101(4), 769-779. https://doi.org/10.2138/am-2016-5314
• Late-stage volatile saturation as a potential trigger for explosive volcanic eruptions
  
  Stock, M., Humphreys, M., Smith, V., Isaia, R., & Pyle, D. (2016). Late-stage volatile saturation as a potential trigger for explosive volcanic eruptions. Nature Geoscience, 9(3), 249-254. https://doi.org/10.1038/ngeo2639
• Magmatic Enclaves and Andesitic Lavas from Mt. Lamington, Papua New Guinea: Implications for Recycling of Earlier-fractionated Minerals through Magma Recharge
  
  Zhang, J., Davidson, J., Humphreys, M., Macpherson, C., & Neill, I. (2015). Magmatic Enclaves and Andesitic Lavas from Mt. Lamington, Papua New Guinea: Implications for Recycling of Earlier-fractionated Minerals through Magma Recharge. Journal of Petrology, 56(11), 2223-2256. https://doi.org/10.1093/petrology/egv071
• Insights into the behaviour of S, F, and Cl at Santiaguito Volcano, Guatemala, from apatite and glass
  
  Scott, J., Humphreys, M., Mather, T., Pyle, D., & Stock, M. (2015). Insights into the behaviour of S, F, and Cl at Santiaguito Volcano, Guatemala, from apatite and glass. Lithos, 232, 375-394. https://doi.org/10.1016/j.lithos.2015.07.004
• Discussion on ‘Magma storage region processes of the Soufrière Hills Volcano, Montserrat’, Geological Society, London, Memoirs, 39, 361-381
  
  Humphreys, M. C., 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, 172(4), 533-539. https://doi.org/10.1144/jgs2014-140
• Coupled interactions between volatile activity and Fe oxidation state during arc crustal processes
  
  Humphreys, M., Brooker, R., Fraser, D., Burgisser, A., Mangan, M., & McCammon, C. (2015). Coupled interactions between volatile activity and Fe oxidation state during arc crustal processes. Journal of Petrology, 56(4), 795-814. https://doi.org/10.1093/petrology/egv017
• New constraints on electron-beam induced halogen migration in apatite
  
  Stock, M., Humphreys, M., Smith, V., Johnson, R., Pyle, D., & EIMF. (2015). New constraints on electron-beam induced halogen migration in apatite. American Mineralogist, 100(1), 281-293. https://doi.org/10.2138/am-2015-4949
• Magnetite-bubble aggregates at mixing interfaces in andesite magma bodies
  
  Edmonds, M., Brett, A., Herd, R., Humphreys, M., & Woods, A. (2015). Magnetite-bubble aggregates at mixing interfaces in andesite magma bodies. Geological Society Special Publications, 410(1), 95-121. https://doi.org/10.1144/sp410.7
• Experimental evidence for polybaric differentiation of primitive arc basalt beneath St. Vincent, Lesser Antilles
  
  Melekhova, E., Blundy, J., Robertson, R., & Humphreys, M. (2015). Experimental evidence for polybaric differentiation of primitive arc basalt beneath St. Vincent, Lesser Antilles. Journal of Petrology, 56(1), 161-192. https://doi.org/10.1093/petrology/egu074
• Distribution of dissolved water in magmatic glass records growth and resorption of bubbles
  
  McIntosh, I., Llewellin, E., Humphreys, M., Nichols, A., Burgisser, A., Schipper, C., & Larsen, J. (2014). Distribution of dissolved water in magmatic glass records growth and resorption of bubbles. Earth and Planetary Science Letters, 401, 1-11. https://doi.org/10.1016/j.epsl.2014.05.037
• Contact metamorphism of Precambrian gneiss by the Skaergaard Intrusion
  
  Bufe, N. A., Holness, M. B., & Humphreys, M. C. (2014). Contact metamorphism of Precambrian gneiss by the Skaergaard Intrusion. Journal of Petrology, 55(8), 1595-1617. https://doi.org/10.1093/petrology/egu035
• Crystallization of interstitial liquid and latent heat buffering in solidifying gabbros: Skaergaard Intrusion, Greenland
  
  Namur, O., Humphreys, M. C., & Holness, M. B. (2014). Crystallization of interstitial liquid and latent heat buffering in solidifying gabbros: Skaergaard Intrusion, Greenland. Journal of Petrology, 55(7), 1389-1427. https://doi.org/10.1093/petrology/egu028
• Geochemical evidence for relict degassing pathways preserved in andesite
  
  Plail, M., Edmonds, M., Humphreys, M., Barclay, J., & Herd, R. (2014). Geochemical evidence for relict degassing pathways preserved in andesite. Earth and Planetary Science Letters, 386, 21-33. https://doi.org/10.1016/j.epsl.2013.10.044
• Oxidised phase relations of a primitive basalt from Grenada, Lesser Antilles
  
  Stamper, C., Melekhova, E., Blundy, J., Arculus, R., Humphreys, M., & Brooker, R. (2014). Oxidised phase relations of a primitive basalt from Grenada, Lesser Antilles. Contributions to Mineralogy and Petrology, 167(1). https://doi.org/10.1007/s00410-013-0954-6
• Lateral Reactive Infiltration in a Vertical Gabbroic Crystal Mush, Skaergaard Intrusion, East Greenland.
  
  Namur, O., Humphreys, M. C., & Holness, M. B. (2013). Lateral Reactive Infiltration in a Vertical Gabbroic Crystal Mush, Skaergaard Intrusion, East Greenland. Journal of Petrology, 54(5), 985-1016. https://doi.org/10.1093/petrology/egt003
• A new method to quantify the real supply of mafic components to a hybrid andesite
  
  Humphreys, M., 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(1), 191-215. https://doi.org/10.1007/s00410-012-0805-x
• Toward an understanding of disequilibrium dihedral angles in mafic rocks
  
  Holness, M., Humphreys, M., Sides, R., Helz, R., & Tegner, C. (2012). Toward an understanding of disequilibrium dihedral angles in mafic rocks. Journal of Geophysical Research. Solid Earth, 117(B6). https://doi.org/10.1029/2011jb008902
• Silicate liquid immiscibility within the crystal mush: Evidence from Ti in plagioclase from the Skaergaard Intrusion.
  
  Humphreys, M. (2011). Silicate liquid immiscibility within the crystal mush: Evidence from Ti in plagioclase from the Skaergaard Intrusion. Journal of Petrology, 52(1), 147-174. https://doi.org/10.1093/petrology/egq076
• Silicate Liquid Immiscibility within the Crystal Mush: Late-stage Magmatic Microstructures in the Skaergaard Intrusion, East Greenland
  
  Holness, M., Stripp, G., Humphreys, M., Veksler, I., Nielsen, T., & Tegner, C. (2011). Silicate Liquid Immiscibility within the Crystal Mush: Late-stage Magmatic Microstructures in the Skaergaard Intrusion, East Greenland. Journal of Petrology, 52(1), 175-222. https://doi.org/10.1093/petrology/egq077
• Melt-rich segregations in the Skaergaard Marginal Border Series: Tearing of a vertical silicate mush
  
  Humphreys, M., & Holness, M. (2010). Melt-rich segregations in the Skaergaard Marginal Border Series: Tearing of a vertical silicate mush. Lithos, 119(3-4), 181-192. https://doi.org/10.1016/j.lithos.2010.06.006
• Volcanic gas emissions from Soufriere Hills Volcano, Montserrat 1995-2009, with implications for mafic magma supply and degassing
  
  Christopher, T., Edmonds, M., Humphreys, M., & Herd, R. (2010). Volcanic gas emissions from Soufriere Hills Volcano, Montserrat 1995-2009, with implications for mafic magma supply and degassing. Geophysical Research Letters, 37(19), Article L00E04. https://doi.org/10.1029/2009gl041325
• Magma hybridisation and diffusive exchange recorded in heterogeneous glasses from Soufriere Hills Volcano, Montserrat
  
  Humphreys, M., Edmonds, M., Christopher, T., & Hards, V. (2010). Magma hybridisation and diffusive exchange recorded in heterogeneous glasses from Soufriere Hills Volcano, Montserrat. Geophysical Research Letters, 37, Article L00E06. https://doi.org/10.1029/2009gl041926
• Excess volatiles supplied by mingling of mafic magma at an andesite arc volcano
  
  Edmonds, M., Aiuppa, A., Humphreys, M., Moretti, R., Giudice, G., Martin, R., Herd, R., & Christopher, T. (2010). Excess volatiles supplied by mingling of mafic magma at an andesite arc volcano. Geochemistry, Geophysics, Geosystems, 11, Article Q04005. https://doi.org/10.1029/2009gc002781
• Microlite transfer by disaggregation of mafic inclusions following magma mixing at Soufrière Hills Volcano, Montserrat
  
  Humphreys, M., Christoper, 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(5), 609-624. https://doi.org/10.1007/s00410-008-0356-3
• Chlorine variations in the magma of Soufriere Hills Volcano, Montserrat: Insights from Cl in hornblende and melt inclusions
  
  Humphreys, M., Edmonds, M., Christopher, T., & Hards, V. (2009). Chlorine variations in the magma of Soufriere Hills Volcano, Montserrat: Insights from Cl in hornblende and melt inclusions. Geochimica et Cosmochimica Acta, 73(19), 5693-5708. https://doi.org/10.1016/j.gca.2009.06.014
• Chemical evolution of intercumulus liquid, as recorded in plagioclase overgrowth rims from the Skaergaard Intrusion.
  
  Humphreys, M. (2009). Chemical evolution of intercumulus liquid, as recorded in plagioclase overgrowth rims from the Skaergaard Intrusion. Journal of Petrology, 50(1), 127-145. https://doi.org/10.1093/petrology/egn076
• Magma ascent rates in explosive eruptions:Constraints from H2O diffusion in melt inclusions
  
  Humphreys., M., Menand, T., Blundy, J., & Klimm, K. (2008). Magma ascent rates in explosive eruptions:Constraints from H2O diffusion in melt inclusions. Earth and Planetary Science Letters, 270(1-2), 25-40. https://doi.org/10.1016/j.epsl.2008.02.041
• Uturuncu volcano, Bolivia: Volcanic unrest due to mid-crustal magma intrusion
  
  Sparks, R., Folkes, C., Humphreys, M., Barfod, D., Clavero, J., Sunagua, M., McNutt, S., & Pritchard, M. (2008). Uturuncu volcano, Bolivia: Volcanic unrest due to mid-crustal magma intrusion. American Journal of Science., 308(6), 727-769. https://doi.org/10.2475/06.2008.01
• Shallow-level decompression crystallisation and deep magma supply at Shiveluch Volcano
  
  Humphreys, M., Blundy, J., & Sparks, R. (2007). Shallow-level decompression crystallisation and deep magma supply at Shiveluch Volcano. Contributions to Mineralogy and Petrology, 155(1), 45-61. https://doi.org/10.1007/s00410-007-0223-7
• Magma evolution and open-system processes at Shiveluch Volcano: Insights from phenocryst zoning
  
  Humphreys, M., Blundy, J., & Sparks, R. (2006). Magma evolution and open-system processes at Shiveluch Volcano: Insights from phenocryst zoning. Journal of Petrology, 47(12), 2303-2334. https://doi.org/10.1093/petrology/egl045
• Magma heating by decompression-driven crystallization beneath andesite volcanoes
  
  Blundy, J., Cashman, K., & Humphreys, M. (2006). Magma heating by decompression-driven crystallization beneath andesite volcanoes. Nature, 443(7107), 76-80. https://doi.org/10.1038/nature05100
• The 2001-2004 dome-forming eruption of Shiveluch volcano, Kamchatka: Observation, petrological investigation and numerical modelling
  
  Dirksen, O., Humphreys, M., Pletchov, P., Melnik, O., Demyanchuk, Y., Sparks, R., & 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(3-4), 201-226.
• SIMS investigation of electron-beam damage to hydrous, rhyolitic glasses: Implications for melt inclusion analysis
  
  Humphreys, M., Kearns, S., & Blundy, J. (2006). SIMS investigation of electron-beam damage to hydrous, rhyolitic glasses: Implications for melt inclusion analysis. American Mineralogist, 91(4), 667-679. https://doi.org/10.2138/am.2006.1936
• The Traigh Bhan na Sgurra Sill, Isle of Mull: Flow localization in a major magma conduit
  
  Holness, M., & Humphreys, M. (2003). The Traigh Bhan na Sgurra Sill, Isle of Mull: Flow localization in a major magma conduit. Journal of Petrology, 44(11), 1961-1976. https://doi.org/10.1093/petrology/egg066