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Permeability Evolution in Variably Glassy Basaltic Andesites Measured Under Magmatic Conditions

Kushnir, A.R.L.; Martel, C.; Champallier, R.; Wadsworth, F.B.

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Authors

A.R.L. Kushnir

C. Martel

R. Champallier



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 1,010°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.

Citation

Kushnir, A., Martel, C., Champallier, R., & Wadsworth, F. (2017). Permeability Evolution in Variably Glassy Basaltic Andesites Measured Under Magmatic Conditions. Geophysical Research Letters, 44(20), 10,262-10,271. https://doi.org/10.1002/2017gl074042

Journal Article Type Article
Acceptance Date Oct 8, 2017
Online Publication Date Oct 25, 2017
Publication Date Oct 12, 2017
Deposit Date Mar 20, 2018
Publicly Available Date Mar 29, 2024
Journal Geophysical Research Letters
Print ISSN 0094-8276
Electronic ISSN 1944-8007
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 44
Issue 20
Pages 10,262-10,271
DOI https://doi.org/10.1002/2017gl074042

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Published Journal Article (854 Kb)
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Copyright Statement
Kushnir, A. R. L. and Martel, C. and Champallier, R. and Wadsworth, F. B. (2017) 'Permeability evolution in variably glassy basaltic andesites measured under magmatic conditions.', Geophysical research letters., 44 (20). 10,262-10,271, 10.1002/2017GL074042. To view the published open abstract, go to https://doi.org/ and enter the DOI.





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