Tracking bubble evolution inside a silicic dike

Antonio M. Álvarez-Valero, Satoshi Okumura, Fabio Arzilli, Javier Borrajo, Clemente Recio, Masao Ban, Juan C. Gonzalo, José M. Benítez, Madison Douglas, Osamu Sasaki, Piedad Franco, Juan Gómez-Barreiro, Asunción Carnicero

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Pressure estimates from rapidly erupted crustal xenoliths constrain the depth of intrusion of the silicic lavas hosting them. This represents an opportunity for tracking magmatic bubble's evolution and quantifying the variation in bubble volume during rapid magma ascent through a volcanic dike just prior to eruption. The petrology, stable-isotope geochemistry and X-ray micro-tomography of dacites containing crustal xenoliths, erupted from a Neogene volcano in SE Spain, showed an increase in porosity from ~ 1.7 to 6.4% from ~ 19 to 13 km depth, at nearly constant groundmass and crystal volumes. This result provides additional constraints for experimental and numerical simulations of subvolcanic magma-crust degassing processes in silicic systems, and may allow the characterization of volcanic eruptive styles based on volatile content.

Original languageEnglish
Pages (from-to)668-676
Number of pages9
Early online date16 Aug 2016
Publication statusPublished - 1 Oct 2016


  • Conduit depths
  • Crustal xenoliths
  • Dacite
  • Stable isotopes
  • Volcanic bubbles
  • X-ray micro-tomography


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