Bulletin of Volcanology

, 75:691 | Cite as

Relating vesicle shapes in pyroclasts to eruption styles

  • Pranabendu MoitraEmail author
  • Helge M. Gonnermann
  • Bruce F. Houghton
  • Thomas Giachetti
Research Article


Vesicles in pyroclasts provide a direct record of conduit conditions during explosive volcanic eruptions. Although their numbers and sizes are used routinely to infer aspects of eruption dynamics, vesicle shape remains an underutilized parameter. We have quantified vesicle shapes in pyroclasts from fall deposits of seven explosive eruptions of different styles, using the dimensionless shape factor \(\Omega \), a measure of the degree of complexity of the bounding surface of an object. For each of the seven eruptions, we have also estimated the capillary number, Ca, from the magma expansion velocity through coupled diffusive bubble growth and conduit flow modeling. We find that \(\Omega \) is smaller for eruptions with \({\rm{Ca}} \ll 1\) than for eruptions with Ca\(\gg 1\). Consistent with previous studies, we interpret these results as an expression of the relative importance of structural changes during magma decompression and bubble growth, such as coalescence and shape relaxation of bubbles by capillary stresses. Among the samples analyzed, Strombolian and Hawaiian fire-fountain eruptions have \({\rm{Ca}} \ll 1\), in contrast to Vulcanian, Plinian, and ultraplinian eruptions. Interestingly, the basaltic Plinian eruptions of Tarawera volcano, New Zealand in 1886 and Mt. Etna, Italy in 122 BC, for which the cause of intense explosive activity has been controversial, are also characterized by \({\rm{Ca}} \gg 1\) and larger values of \(\Omega \) than Strombolian and Hawaiian style (fire fountain) eruptions. We interpret this to be the consequence of syn-eruptive magma crystallization, resulting in high magma viscosity and reduced rates of bubble growth. Our model results indicate that during these basaltic Plinian eruptions, buildup of bubble overpressure resulted in brittle magma fragmentation.


Vesicle shape Pyroclast Basaltic Plinian eruption Regularity Capillary number Bubble growth Conduit flow model Magma fragmentation 



The study was funded by the National Science Foundation grants EAR-1019872 and EAR-0810332. The authors thank J. E. Gardner, A. A. Proussevitch, and one anonymous reviewer for the thorough and constructive comments.


  1. Adams NK, Houghton BF, Hildreth W (2006) Abrupt transitions during sustained explosive eruptions: examples from the 1912 eruption of Novarupta, Alaska. Bull Volcanol 69:189–206CrossRefGoogle Scholar
  2. Amon M, Denson CD (1984) A study of the dynamics of foam growth: analysis of the growth of closely spaced spherical bubbles. Poly Eng Sci 24:1026–1034CrossRefGoogle Scholar
  3. Arefmanesh A, Advani SG (1991) Diffusion-induced growth of a gas bubble in a viscoelastic fluid. Rheol Acta 30:274–283CrossRefGoogle Scholar
  4. Alidibirov M (1994) A model for viscous magma fragmentation during volcanic blasts. Bull Volcanol 56:459–465CrossRefGoogle Scholar
  5. Blackburn EA, Wilson L, Sparks RSJ (1976) Mechanisms and dynamics of strombolian activity. J Geol Soc Lon 132:429–440CrossRefGoogle Scholar
  6. Brugger CR, Hammer JE (2010) Crystallization kinetics in continuous decompression experiments: implications for interpreting natural magma ascent processes. J Petrol 51:1941–1965CrossRefGoogle Scholar
  7. Burkhard DJM (2005) Nucleation and growth rates of pyroxene, plagioclase, and Fe-Ti oxides in basalt under atmospheric conditions. Eur J Mineral 17:675–685CrossRefGoogle Scholar
  8. Burgisser A, Gardner JE (2005) Experimental constraints on degassing and permeability in volcanic conduit flow. Bull Volcanol 67:42–56CrossRefGoogle Scholar
  9. Burgisser A, Poussineau S, Arbaret L, Druitt TH, Giachetti T, Bourdier J-L (2010) Pre-explosive conduit conditions of the 1997 Vulcanian explosions at Soufrière Hills Volcano (Montserrat): I. Pressure and vesicularity distributions. J Volcanol Geotherm Res 194:27–41CrossRefGoogle Scholar
  10. Burgisser A, Arbaret L, Druitt TH, Giachetti T (2011) Pre-explosive conduit conditions of the 1997 Vulcanian explosions at Soufrière Hills Volcano (Montserrat): II. Overpressure and depth distributions. J Volcanol Geotherm Res 199:193–205CrossRefGoogle Scholar
  11. Burton M, Allard P, Murè F, La Spina A (2007) Magmatic gas composition reveals the source depth of slug-driven Strombolian explosive activity. Science 317:227–230CrossRefGoogle Scholar
  12. Cashman KV (1993) Relationship between plagioclase crystallization and cooling rate in basaltic melts. Conrib Mineral Petrol 113:126–142CrossRefGoogle Scholar
  13. Cashman KV, Mangan MT (1994) Physical aspects of magmatic degassing: II. Constraints on vesiculation processes from textural studies of eruptive products. In: Carroll MR, Holloway JR (eds) Volatiles in magmas. Reviews in mineralogy, vol 30. Minarological Society of America, Washington, DC, pp 447–478Google Scholar
  14. Coltelli M, Del Carlo P, Vezzoli L (1998) Discovery of a Plinian basaltic eruption of Roman age at Etna volcano, Italy. Geology 26:1095–1098CrossRefGoogle Scholar
  15. Costa A, Caricchi L, Bagdassarov N (2009) A model for the rheology of particle-bearing suspensions and partially molten rocks. Geochem Geophys Geosys 10(3):Q03010. doi: 10.1029/2008GC002138 CrossRefGoogle Scholar
  16. Costantini L, Bonadonna C, Houghton B, Wehrmann H (2009) New physical characterization of the Fontana lapilli basaltic Plinian eruption, Nicaragua. Bull Volcanol 71:337–355CrossRefGoogle Scholar
  17. Del Carlo P, Pompilio M (2004) The relationship between volatile content and the eruptive style of basaltic magma: the Etna case. Annal Geophys 47:1423–1432Google Scholar
  18. Dingwell DB (1996) Volcanic dilemma: flow or blow? Science 273:1054–1055CrossRefGoogle Scholar
  19. Dixon JE (1997) Degassing of alkalic basalts. Am Mineral 82:368–378Google Scholar
  20. Dobran F (1992) Nonequilibrium flow in volcanic conduits and applications to the eruptions of Mount St. Helens on May 18, 1980, and Vesuvius in A.D. 79. J Volcanol Geotherm Res 49:285–311CrossRefGoogle Scholar
  21. Druitt TH, Young SR, Baptie B, Bonadonna C, Calder ES, Clarke AB, Cole PD, Harford CL, Herd RA, Luckett R, Ryan G, Voight B (2002) Episodes of cyclic Vulcanian explosive activity with fountain collapse at Soufrière Hills Volcano, Montserrat. In: Druitt TH, Kokelaar BP (eds) The eruption of the Soufrière Hills Volcano from 1995 to 1999, Montserrat, Antilles. Geol Soc London Mem, vol 21, pp 281–306Google Scholar
  22. Dunbar N, Kyle PR, Wilson CJN (1989) Evidence of limited zonation in silicic magma systems, Taupo Volcanic Zone, New Zealand. Geology 17:234–236CrossRefGoogle Scholar
  23. Dunbar NW, Kyle P (1993) Lack of volatile gradient in the Taupo plinian-ignimbrite transition: evidence from melt inclusion analysis. Am Mineral 78:612–618Google Scholar
  24. Gamble JA, Smith IEM, Graham IJ, Kokelaar BP, Cole JW, Houghton BF, Wilson CJN (1990) The petrology, phase relations and tectonic setting of basalts from the Taupo Volcanic Zone, New Zealand and the Kermadec Island Arc-Havre Trough, SW Pacific. J Volcanol Geotherm Res 43:235–270CrossRefGoogle Scholar
  25. Gardner JE (2007) Bubble coalescence in rhyolitic melts during decompression from high pressure. J Volcanol Geotherm Res 166:161–176CrossRefGoogle Scholar
  26. Gardner JE, Ketcham RA (2011) Bubble nucleation in rhyolite and dacite melts: temperature dependence of surface tension. Contrib Mineral Petr 162:929–943CrossRefGoogle Scholar
  27. Giachetti T, Druitt TH, Burgisser A, Arbaret L, Galven C (2010) Bubble nucleation, growth and coalescence during the 1997 Vulcanian explosions of Soufrière Hills Volcano, Montserrat. J Volcanol Geotherm Res 193:215–231CrossRefGoogle Scholar
  28. Giordano D, Dingwell DB (2003) Viscosity of hydrous Etna basalt: implications for Plinian-style basaltic eruptions. Bull Volcanol 65:8–14Google Scholar
  29. Goepfert K, Gardner JE (2010) Influence of pre-eruptive storage conditions and volatile contents on explosive Plinian style eruptions of basic magma. Bull Volcanol 72:511–521CrossRefGoogle Scholar
  30. Gonnermann HM, Manga M (2007) The fluid mechanics inside a volcano. Annu Rev Fluid Mech 39:321–356CrossRefGoogle Scholar
  31. Gonnermann HM, Houghton BF (2012) Magma degassing during the Plinian eruption of Novarupta, Alaska, 1912. Geochem Geophys Geosys 13:Q10009. doi: 10.1029/2012GC00427 CrossRefGoogle Scholar
  32. Hammer J, Rutherford M, Hildreth W (2002) Magma storage prior to the 1912 eruption at Novarupta, Alaska. Contrib Mineral Petr 144:144–162CrossRefGoogle Scholar
  33. Hammer J (2008) Experimental studies of the kinetics and energetics of magma crystallization. Rev Mineral Petr 69:9–59CrossRefGoogle Scholar
  34. Hildreth W, Fierstein J (2012) The Novarupta-Katmai eruption of 1912 Largest eruption of the twentieth century: centennial perspectives. US Geol Surv Prof Pap 1791:259Google Scholar
  35. Houghton BF, Wilson CJN, Carlo PD, Coltelli M, Sable JE, Carey R (2004) The influence of conduit processes on changes in style of basaltic plinian eruptions: Tarawera 1886 and Etna 122 BC. J Volcanol Geotherm Res 137:1–14CrossRefGoogle Scholar
  36. Houghton BF, Gonnermann HM (2008) Basaltic explosive volcanism: constraints from deposits and models. Chem Erde 68:117–140CrossRefGoogle Scholar
  37. Houghton BF, Carey RJ, Cashman KV, Wilson CJN, Hobden BJ, Hammer JE (2010) Diverse patterns of ascent, degassing, and eruption of rhyolite magma during the 1.8 ka Taupo eruption, New Zealand: evidence from clast vesicularity. J Volcanol Geotherm Res 195:31–47CrossRefGoogle Scholar
  38. Hui H, Zhang Y (2007) Toward a general viscosity equation for natural anhydrous and hydrous silicate melts. Geochim Cosmochim Acta 71:403–416CrossRefGoogle Scholar
  39. Kaminski E, Jaupart C (1997) Expansion and quenching of vesicular magma fragments in Plinian eruptions. J Geophys Res 102:11287–12203CrossRefGoogle Scholar
  40. Kerrick D, Jacobs G (1981) A modified Redlich-Kwong equation for H2O, CO2, and H2O-CO2 mixtures at elevated pressures and temperatures. Am J Sci 281:735–767CrossRefGoogle Scholar
  41. Klug C, Cashman KV (1996) Permeability development in vesiculating magmas: implications for fragmentation. Bull Volcanol 58:87–100CrossRefGoogle Scholar
  42. Koerner C (2008) Foam formation mechanisms in particle suspensions applied to metal foams. Mater Sci Eng A 495:227–235CrossRefGoogle Scholar
  43. Koyaguchi T (2005) An analytical study for 1-dimensional steady flow in volcanic conduits. J Volcanol Geotherm Res 143:29–52CrossRefGoogle Scholar
  44. Lautze NC, Houghton B (2005) Physical mingling of magma and complex eruption dynamics in the shallow conduit at Stromboli volcano, Italy. Geology 33:425–428CrossRefGoogle Scholar
  45. Lautze NC, Houghton BF (2007) Linking variable explosion style and magma textures during 2002 at Stromboli volcano, Italy. Bull Volcanol 69:445–460CrossRefGoogle Scholar
  46. Lensky NG, Lyakhovsky V, Navon O (2001) Radial variations of melt viscosity around growing bubbles and gas overpressure in vesiculating magmas. Earth Planet Sci Lett 186:1–6CrossRefGoogle Scholar
  47. Liu Y, Zhang Y, Behrens H (2005) Solubility of H2O in rhyolitic melts at low pressures and a new empirical model for mixed H2O-CO2 solubility in rhyolitic melts. J Volcanol Geotherm Res 143:219–235CrossRefGoogle Scholar
  48. Mangan MT, Cashman KV, Newman S (1993) Vesiculation of basaltic magma during eruption. Geology 21:157–160CrossRefGoogle Scholar
  49. Mangan MT, Cashman KV (1996) The structure of basaltic scoria and reticulite and inferences for vesiculation, foam formation, and fragmentation in lava fountains. J Volcanol Geotherm Res 73:1–18CrossRefGoogle Scholar
  50. Marsh BD (1998) On the interpretation of crystal size distributions in magmatic systems. J Petrol 39:553–599CrossRefGoogle Scholar
  51. Mastin LG (2002) Insights into volcanic conduit flow from an open-source numerical model. Geochem Geophy Geosy 3:1037. doi: 10.1029/2001GC000192 CrossRefGoogle Scholar
  52. McBirney A, Murase T (1970) Factors governing the formation of pyroclastic rocks. Bull Volcanol 34:372–384CrossRefGoogle Scholar
  53. Melnik O, Sparks RSJ (2002) Modelling of conduit flow dynamics during explosive activity at Soufrière Hills Volcano, Montserrat. In: Druitt TH, Kokelaar BP (eds) The eruption of Soufrière Hills Volcano, Montserrat, from 1995 to 1999. Geological Society, London, Memoirs, vol 21, pp 307–317Google Scholar
  54. Mueller S, Scheu B, Spieler O, Dingwell DB (2008) Permeability control on magma fragmentation. Geology 36:399–402CrossRefGoogle Scholar
  55. Namiki A, Manga M (2006) Influence of decompression rate on the expansion velocity and expansion style of bubbly fluids. J Geophys Res 111:B11208. doi: 10.1029/2005JB004132 CrossRefGoogle Scholar
  56. Namiki A, Manga M (2008) Transition between fragmentation and permeable outgassing of low viscosity magmas. J Volcanol Geotherm Res 169:48–60CrossRefGoogle Scholar
  57. Okumura S, NakamuraM, Tsuchiyama A, Nakano T, Uesugi K (2008) Evolution of bubble microstructure in sheared rhyolite: formation of a channel-like bubble network. J Geophys Res 133:B07208. doi: 10.1029/2007JB005362 CrossRefGoogle Scholar
  58. Parfitt EA (2004) A discussion of the mechanisms of explosive basaltic eruptions. J Volcanol Geotherm Res 134:77–107CrossRefGoogle Scholar
  59. Picard D, Arbaret L, Pichavant M, Champallier R, Launeau P (2011) Rheology and microstructure of experimentally deformed plagioclase suspensions. Geology 39:747–750Google Scholar
  60. Pistolesi M, Delle Donne D, Pioli L, Rosi M, Ripepe M (2011) The 15 March 2007 explosive crisis at Stromboli volcano, Italy: assessing physical parameters through a multidisciplinary approach. J Geophys Res 116:B12206. doi: 10.1029/2011JB008527 CrossRefGoogle Scholar
  61. Polacci M, Pioli L, Rosi M (2003) The Plinian phase of the Campanian Ignimbrite eruption (Phlegrean Fields, Italy): evidence from density measurements and textural characterization of pumice. Bull Volcanol 65:418–432CrossRefGoogle Scholar
  62. Proussevitch AA, Sahagian DL, Anderson AT (1993) Dynamics of diffusive bubble growth in magmas: isothermal case. J Geophys Res 98:22283–22307CrossRefGoogle Scholar
  63. Proussevitch A, Sahagian D (2005) Bubbledrive-1: a numerical model of volcanic eruption mechanisms driven by disequilibrium magma degassing. J Volcanol Geotherm Res 143:89–111CrossRefGoogle Scholar
  64. Proussevitch AA, Sahagian DL, Tsentalovich EP (2007) Statistical analysis of bubble and crystal size distributions: formulations and procedures. J Volcanol Geotherm Res 164:95–111CrossRefGoogle Scholar
  65. Pupier E, Cuchene S, Toplis MJ (2008) Experimental quantification of plagioclase crystal size distribution during cooling of a basaltic liquid. Contrib Mineral Petrol 155:555–570CrossRefGoogle Scholar
  66. Rallison JM (1984) The deformation of small viscous drops and bubbles in shear flows. Annu Rev Fluid Mech 16:45–66CrossRefGoogle Scholar
  67. Ripepe M, Ciliberto S, Della Schiava M (2001) Time constraints for modeling source dynamics of volcanic explosions at Stromboli. J Geophys Res 106:8713–8727CrossRefGoogle Scholar
  68. Russ JC, Dehoff RT (2000) Practical Stereology, 2nd Ed. Kluwer, New York, p 382Google Scholar
  69. Rust AC, Manga M (2002a) Bubble shapes and orientations in low Re simple shear flow. J Colloid Interface Sci 249:476–480CrossRefGoogle Scholar
  70. Rust AC, Manga M (2002b) Effects of bubble deformation on the viscosity of dilute suspensions. J NonNewt Fluid Mech 104:53–63CrossRefGoogle Scholar
  71. Rust AC, Manga M, Cashman KV (2003) Determining flow type, shear rate and shear stress in magmas from bubble shapes and orientations. J Volcanol Geotherm Res 122:111–132CrossRefGoogle Scholar
  72. Rust AC, Cashman KV (2011) Permeability controls on expansion and size distributions of pyroclasts. J Geophys Res 116:B11202CrossRefGoogle Scholar
  73. Sable JE, Houghton BF, Del Carlo P, Coltelli M (2006) Changing conditions of magma ascent and fragmentation during the Etna 122 BC basaltic Plinian eruption: evidence from clast microtextures. J Volcanol Geotherm Res 158:333–354CrossRefGoogle Scholar
  74. Sable JE, Houghton BF, Wilson CJN, Carey RJ (2009) Eruption mechanisms during the climax of the Tarawera 1886 basaltic Plinian eruption inferred from microtextural characteristics of the deposits. In: Thordarson T, Self S, Larsen J, Rowland K, Hoskuldsson A (eds) Studies in volcanology. The legacy of George Walker. Geological Society, London, pp 129–154Google Scholar
  75. Schneider CA, Rasband WS, Eliceiri KW (2012) NIH Image to ImageJ: 25 years of image analysis. Nat Methods 9:671–675CrossRefGoogle Scholar
  76. Scriven L (1959) On the dynamics of phase growth. Chem Eng Sci 10:1–13CrossRefGoogle Scholar
  77. Seyfried R, Freundt A (2000) Experiments on conduit flow and eruption behavior of basaltic volcanic eruptions. J Geophys Res 105:23727–23740CrossRefGoogle Scholar
  78. Shea T, Houghton BF, Gurioli L, Cashman KV, Hammer JE, Hobden BJ (2010) Textural studies of vesicles in volcanic rocks: an integrated methodology. J Volcanol Geotherm Res 190:271–289CrossRefGoogle Scholar
  79. Sparks RSJ (1978) The dynamics of bubble formation and growth in magmas: a review and analysis. J Volcanol Geotherm Res 3:1–37CrossRefGoogle Scholar
  80. Spieler O, Kennedy B, Kueppers U, Dingwell DB, Scheu B, Taddeucci J (2004) The fragmentation threshold of pyroclastic rocks. Earth Planet Sci Lett 226:139–148CrossRefGoogle Scholar
  81. Stone HA (1994) Dynamics of drop deformation and breakup in viscous fluids. Annu Rev Fluid Mech 26:65–102CrossRefGoogle Scholar
  82. Stovall WK, Houghton BF, Gonnermann HM, Fagents SA, Swanson DA (2011) Eruption dynamics of Hawaiian-style fountains: the case study of episode 1 of the Kı̄lauea Iki 1959 eruption. Bull Volcanol 73:511–529CrossRefGoogle Scholar
  83. Szramek L, Gardner JE, Larsen J (2006) Degassing and microlite crystallization of basaltic andesite magma erupting at Arenal volcano, Costa Rica. J Volcanol Geotherm Res 157:182–201CrossRefGoogle Scholar
  84. Szramek LA (2010) Basaltic volcanism: deep mantle recycling, Plinian eruptions, and cooling-induced crystallization. PhD thesis, UT AustinGoogle Scholar
  85. Szramek L, Gardner JE, Hort M (2010) Cooling-induced crystallization of microlite crystals in two basaltic pumice clasts. Am Mineral 95:503–509CrossRefGoogle Scholar
  86. Taylor GI (1932) The viscosity of a fluid containing small drops of another fluid. Proc Roy Soc A 138:41–48CrossRefGoogle Scholar
  87. Taylor GI (1934) The formation of emulsions in definable fields of flow. Proc Roy Soc A 146:501–523CrossRefGoogle Scholar
  88. Thomas RME, Sparks RSJ (1992) Cooling of tephra during fallout from eruption columns. Bull Volcanol 54:542–553CrossRefGoogle Scholar
  89. Vergniolle S, Mangan M (2000) Hawaiian and Strombolian eruptions. In: Sigurdsson H, Houghton BF, McNutt S, Rymer H, Stix J (eds) Encyclopedia of volcanoes. Academic, San Diego, pp 447–461Google Scholar
  90. Walker GPL (1973) Explosive volcanic eruptions—a new classification scheme. Geol Rund 62:431–446CrossRefGoogle Scholar
  91. Walker G (1980) The Taupo pumice—product of the most powerful known (ultraplinian) eruption. J Volcanol Geotherm Res 8:69–94CrossRefGoogle Scholar
  92. Walker GPL, Self S, Wilson L (1984) Tarawera 1886, New Zealand—a basaltic Plinian fissure eruption. J Volcanol Geotherm Res 21:61–78CrossRefGoogle Scholar
  93. Wallace PJ, Anderson AT Jr (1998) Effects of eruption and lava drainback on the H2O contents of basaltic magmas at Kilauea volcano. Bull Volcanol 59:327–344CrossRefGoogle Scholar
  94. Wilson L (1980) Relationships between pressure, volatile content and ejecta velocity in three types of volcanic explosion. J Volcanol Geotherm Res 8:297–313CrossRefGoogle Scholar
  95. Wright HM, Cashman KV, Gottesfeld EH, Roberts JJ (2009) Strain localization in vesicular magma: implications for rheology and fragmentation. Geology 37:1023–1026CrossRefGoogle Scholar
  96. Wright HM, Weinberg RF (2009) Pore structure of volcanic clasts: measurements of permeability and electrical conductivity. Earth Planet Sci Lett 280:93–104CrossRefGoogle Scholar
  97. Zhang YX (1999) A criterion for the fragmentation of bubbly magma based on brittle failure theory. Nature 402:648–650CrossRefGoogle Scholar
  98. Zhang Y, Behrens H (2000) H2O diffusion in rhyolitic melts and glasses. Chem Geol 169:243–262CrossRefGoogle Scholar
  99. Zhang Y, Xu Z, Zhu M, Wang H (2007) Silicate melt properties and volcanic eruptions. Rev Geophys 45:1–27CrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Pranabendu Moitra
    • 1
    Email author
  • Helge M. Gonnermann
    • 1
  • Bruce F. Houghton
    • 2
  • Thomas Giachetti
    • 1
  1. 1.Department of Earth ScienceRice UniversityHoustonUSA
  2. 2.Department of Geology and GeophysicsUniversity of Hawai‘i at ManoaHonoluluUSA

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