Permeability evolution in variably glassy basaltic andesites measured under magmatic conditions

Alexandra Roma Larisa Kushnir 1, 2, 3 Caroline Martel 1, 3 Rémi Champallier 1, 3 F. B. Wadsworth 4
1 ISTO - Institut des Sciences de la Terre d'Orléans - UMR7327
2 IPGS - Institut de physique du globe de Strasbourg
3 Magma - UMR7327
ISTO - Institut des Sciences de la Terre d'Orléans - UMR7327
4 Ludwig-Maximilians-Universität München
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.
Type de document :
Article dans une revue
Geophysical Research Letters, American Geophysical Union, 2017, 44, pp.10,262-10,271. 〈10.1002/2017GL074042〉
Liste complète des métadonnées

Littérature citée [55 références]  Voir  Masquer  Télécharger
https://hal-insu.archives-ouvertes.fr/insu-01622091
Contributeur : Nathalie Pothier <>
Soumis le : jeudi 16 novembre 2017 - 14:50:40
Dernière modification le : mercredi 19 septembre 2018 - 01:35:37
Document(s) archivé(s) le : samedi 17 février 2018 - 14:39:19

Fichier

Kushnir_et_al-2017-Geophysical...
Fichiers éditeurs autorisés sur une archive ouverte

Identifiants

Collections

INSU | BRGM | UNIV-ORLEANS | ISTO | OSUC | SITE-ALSACE

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〉

Exporter

BibTeX TEI DC DCterms EndNote

Partager

Métriques

Consultations de la notice

91

Téléchargements de fichiers

13

Contact

support.ccsd.cnrs.fr
hal.support@ccsd.cnrs.fr
Logo CCSD