Rapid onset of mafic magmatism facilitated by volcanic edifice collapse - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles Geophysical Research Letters Year : 2015

Rapid onset of mafic magmatism facilitated by volcanic edifice collapse

M. R Palmer
  • Function : Author
M. Edmonds
  • Function : Author
M. Jutzeler
  • Function : Author
M. Manga
  • Function : Author
M. Coussens
  • Function : Author
T. Gernon
  • Function : Author
R. N Taylor
  • Function : Author
A. Michalik
  • Function : Author
E. Inglis
C. Breitkreuz
  • Function : Author
G. Boudon
T. Adachi
  • Function : Author
M. Hornbach
  • Function : Author
A. Fujinawa
  • Function : Author
K. S Kataoka
  • Function : Author
F. Maeno
  • Function : Author
Y. Tamura
  • Function : Author
F. Wang


Volcanic edifice collapses generate some of Earth's largest landslides. How such unloading affects the magma storage systems is important for both hazard assessment and for determining long-term controls on volcano growth and decay. Here we present a detailed stratigraphic and petrological analyses of volcanic landslide and eruption deposits offshore Montserrat, in a subduction zone setting, sampled during Integrated Ocean Drilling Program Expedition 340. A large (6-10 km 3) collapse of the Soufrière Hills Volcano at ~130 ka was followed by explosive basaltic volcanism and the formation of a new basaltic volcanic center, the South Soufrière Hills, estimated to have initiated <100 years after collapse. This basaltic volcanism was a sharp departure from the andesitic volcanism that characterized Soufrière Hills' activity before the collapse. Mineral-melt thermobarometry demonstrates that the basaltic magma's transit through the crust was rapid and from midcrustal depths. We suggest that this rapid ascent was promoted by unloading following collapse.


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insu-01892585 , version 1 (10-10-2018)



M. Cassidy, S F L Watt, P. J. Talling, M. R Palmer, M. Edmonds, et al.. Rapid onset of mafic magmatism facilitated by volcanic edifice collapse. Geophysical Research Letters, 2015, 42 (12), pp.4778-4785. ⟨10.1002/2015gl064519⟩. ⟨insu-01892585⟩
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