Please use this identifier to cite or link to this item:
http://hdl.handle.net/2122/9030
DC Field | Value | Language |
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dc.contributor.authorall | Rivalta, E.; GFZ Potsdam, Helmholtzstraße 7, 14467 Potsdam, Germany | en |
dc.contributor.authorall | Pascal, K.; School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK | en |
dc.contributor.authorall | Phillips, G.; School of Earth Sciences, University of Bristol, Queen's Road, Bristol BS8 1RJ, UK | en |
dc.contributor.authorall | Bonaccorso, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione Catania, Catania, Italia | en |
dc.date.accessioned | 2014-06-13T12:22:29Z | en |
dc.date.available | 2014-06-13T12:22:29Z | en |
dc.date.issued | 2013 | en |
dc.identifier.uri | http://hdl.handle.net/2122/9030 | en |
dc.description.abstract | While ascending in the plumbing system of volcanoes, magma undergoes decompression at rates spanning several orders of magnitude and set by a number of factors internal and external to the volcano. Slow decompression generally results in an effusive or mildly explosive expansion of the magma, but counterexamples of sudden switches from effusive to explosive eruptive behaviour have been documented at various volcanoes worldwide. The mechanisms involved in this behavior are currently debated, in particular regarding basaltic magmas. Here, we explore the interplay between decompression rate and vesiculation vigour by decompressing a magma analog obtained by dissolving pine resin into acetone in varying proportions. Our mixtures contain solid particles and upon decompression experience the nucleation of acetone bubbles. We find mixtures high in acetone, containing smaller and fewer solid particles, experience strong supersaturation and fragment for very slow decompressions, despite having low viscosity, while mixtures low in acetone, with more and larger solid particles degas efficiently. We interpret our results in terms of delayed bubble nucleation due to a lack of efficient nucleation sites. We discuss how a similar mechanism might induce violent, explosive expansion in volatile-rich and poorly crystalline low-silica magmas, by analogy to previous inferences for rhyolitic magmas. | en |
dc.language.iso | English | en |
dc.publisher.name | American Geophysical Union | en |
dc.relation.ispartof | Geochemistry, Geophysics, Geosystems | en |
dc.relation.ispartofseries | /14 (2013) | en |
dc.subject | Magma fragmentation | en |
dc.subject | basaltic magma | en |
dc.subject | analog laboratory experiments | en |
dc.subject | slow decompression | en |
dc.subject | bubble nucleation | en |
dc.subject | explosive volcanic eruptions | en |
dc.title | Explosive expansion of a slowly-decompressed magma analog:evidence of delayed bubble nucleation | en |
dc.type | article | en |
dc.description.status | Published | en |
dc.type.QualityControl | Peer-reviewed | en |
dc.description.pagenumber | 3067-3084 | en |
dc.subject.INGV | 04. Solid Earth::04.08. Volcanology::04.08.02. Experimental volcanism | en |
dc.identifier.doi | 10.1002/gge.20183 | en |
dc.description.obiettivoSpecifico | 2V. Dinamiche di unrest e scenari pre-eruttivi | en |
dc.description.journalType | JCR Journal | en |
dc.description.fulltext | embargoed_20150613 | en |
dc.relation.eissn | 1525-2027 | en |
dc.contributor.author | Rivalta, E. | en |
dc.contributor.author | Pascal, K. | en |
dc.contributor.author | Phillips, G. | en |
dc.contributor.author | Bonaccorso, A. | en |
dc.contributor.department | School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK | en |
dc.contributor.department | School of Earth Sciences, University of Bristol, Queen's Road, Bristol BS8 1RJ, UK | en |
dc.contributor.department | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione OE, Catania, Italia | en |
item.openairetype | article | - |
item.cerifentitytype | Publications | - |
item.languageiso639-1 | en | - |
item.grantfulltext | open | - |
item.openairecristype | http://purl.org/coar/resource_type/c_18cf | - |
item.fulltext | With Fulltext | - |
crisitem.author.dept | GFZ German Research Center for Geosciences, Potsdam, Germany | - |
crisitem.author.dept | School of Earth and Environment, University of Leeds, Leeds LS2 9JT, UK | - |
crisitem.author.dept | School of Earth Sciences, University of Bristol, Queen's Road, Bristol BS8 1RJ, UK | - |
crisitem.author.dept | Istituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione OE, Catania, Italia | - |
crisitem.author.orcid | 0000-0001-8245-0504 | - |
crisitem.author.orcid | 0000-0002-4770-6006 | - |
crisitem.author.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
crisitem.classification.parent | 04. Solid Earth | - |
crisitem.department.parentorg | Istituto Nazionale di Geofisica e Vulcanologia | - |
Appears in Collections: | Article published / in press |
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File | Description | Size | Format | |
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2013 Rivalta et al_G-cubed_2013.pdf | main article | 6.24 MB | Adobe PDF | View/Open |
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