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Hydrothermal alteration of andesitic lava domes can lead to explosive volcanic behaviour
Univ Strasbourg, EOST, UMR 7516, CNRS, Inst Phys Globe Strasbourg, Strasbourg, France.
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, Mineralogy Petrology and Tectonics. Univ Padjajaran UNPAD, Fac Geol Engn, Bandung, Indonesia.
Univ Strasbourg, EOST, UMR 7516, CNRS, Inst Phys Globe Strasbourg, Strasbourg, France.
Tech Univ Munich, Chair Engn Geol, Munich, Germany.
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2019 (English)In: Nature Communications, ISSN 2041-1723, E-ISSN 2041-1723, Vol. 10, article id 5063Article in journal (Refereed) Published
Abstract [en]

Dome-forming volcanoes are among the most hazardous volcanoes on Earth. Magmatic outgassing can be hindered if the permeability of a lava dome is reduced, promoting pore pressure augmentation and explosive behaviour. Laboratory data show that acid-sulphate alteration, common to volcanoes worldwide, can reduce the permeability on the sample lengthscale by up to four orders of magnitude and is the result of pore- and microfracture-filling mineral precipitation. Calculations using these data demonstrate that intense alteration can reduce the equivalent permeability of a dome by two orders of magnitude, which we show using numerical modelling to be sufficient to increase pore pressure. The fragmentation criterion shows that the predicted pore pressure increase is capable of fragmenting the majority of dome-forming materials, thus promoting explosive volcanism. It is crucial that hydrothermal alteration, which develops over months to years, is monitored at dome-forming volcanoes and is incorporated into real-time hazard assessments.

Place, publisher, year, edition, pages
2019. Vol. 10, article id 5063
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Geology
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URN: urn:nbn:se:uu:diva-397637DOI: 10.1038/s41467-019-13102-8ISI: 000494938500001PubMedID: 31700076OAI: oai:DiVA.org:uu-397637DiVA, id: diva2:1372268
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EU, Horizon 2020Available from: 2019-11-22 Created: 2019-11-22 Last updated: 2019-11-22Bibliographically approved

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