Permeability evolution in variably glassy basaltic andesites measured under magmatic conditions

Abstract : Heat from inflowing magma may act to seal permeable networks that assist passive outgassing at volcanic conduit margins and in overlying domes, reducing the efficiency of overpressure dissipation. Here we present a study of the evolution of permeability – measured under magmatic conditions - with increasing temperature in glassy and glass-poor basaltic andesites from Merapi volcano (Indonesia). Whereas the permeability of glass-poor rocks decreases little up to a temperature of 1010°C, glassy specimens experience a pronounced decrease in permeability above the glass transition once the viscosity of the crystal suspension is low enough to relax under external stresses. Changes in temperature alone are thus not enough to significantly modify the permeability of the glass-poor rocks that commonly form Merapi's dome. However, the presence of glass-rich domains in a dome may lead to local sealing of the volcanic plumbing between eruptions, exacerbating localized overpressure development that could contribute to explosivity.
Document type :
Journal articles
Complete list of metadatas

Cited literature [55 references]  Display  Hide  Download

https://hal-insu.archives-ouvertes.fr/insu-01622091
Contributor : Nathalie Pothier <>
Submitted on : Thursday, November 16, 2017 - 2:50:40 PM
Last modification on : Friday, May 10, 2019 - 1:54:18 PM
Long-term archiving on : Saturday, February 17, 2018 - 2:39:19 PM

File

Kushnir_et_al-2017-Geophysical...
Publisher files allowed on an open archive

Identifiers

Collections

Citation

Alexandra Roma Larisa Kushnir, Caroline Martel, Rémi Champallier, F. B. Wadsworth. Permeability evolution in variably glassy basaltic andesites measured under magmatic conditions. Geophysical Research Letters, American Geophysical Union, 2017, 44, pp.10,262-10,271. ⟨10.1002/2017GL074042⟩. ⟨insu-01622091⟩

Share

Metrics

Record views

141

Files downloads

86