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dc.contributor.authorChristopher, TEen
dc.contributor.authorBlundy, Jen
dc.contributor.authorCashman, Ken
dc.contributor.authorCole, Pen
dc.contributor.authorEdmonds, Men
dc.contributor.authorSmith, PJen
dc.contributor.authorSparks, RSJen
dc.contributor.authorStinton, Aen
dc.date.accessioned2017-02-13T14:31:03Z
dc.date.available2017-02-13T14:31:03Z
dc.date.issued2015-09-01en
dc.identifier.urihttp://hdl.handle.net/10026.1/8459
dc.description.abstract

© 2015. American Geophysical Union. All Rights Reserved. Activity since 1995 at Soufrière Hills Volcano (SHV), Montserrat has alternated between andesite lava extrusion and quiescence, which are well correlated with seismicity and ground deformation cycles. Large variations in SO2 flux do not correlate with these alternations, but high and low HCl/SO2 characterize lava dome extrusion and quiescent periods respectively. Since lava extrusion ceased (February 2010) steady SO2 emissions have continued at an average rate of 374 tonnes/day (± 140 t/d), and incandescent fumaroles (temperatures up to 610oC) on the dome have not changed position or cooled. Occasional short bursts (over several hours) of higher (∼ 10x) SO2 flux have been accompanied by swarms of volcano-tectonic earthquakes. Strain data from these bursts indicate activation of the magma system to depths up to 10 km. SO2 emissions since 1995 greatly exceed the amounts that could be derived from 1.1 km3 of erupted andesite, and indicating extensive partitioning of sulfur into a vapour phase, as well as efficient decoupling and outgassing of sulfur-rich gases from the magma. These observations are consistent with a vertically extensive, crustal magmatic mush beneath SHV. Three states of the magmatic system are postulated to control degassing. During dormant periods (103 to 104 years) magmatic vapour and melts separate as layers from the mush and decouple from each other. In periods of unrest (years) without eruption, melt and fluid layers become unstable, ascend and can amalgamate. Major destabilization of the mush system leads to eruption, characterized by magma mixing and release of volatiles with different ages, compositions and sources. Key Points: SO2 fluxes from the Soufriere Hills volcano are decoupled from magma SO2 gas is sourced at depth and emerges in pulses associated with seismicity Magma systemssegregate fluids and melt then destablize to erupt

en
dc.format.extent2797 - 2811en
dc.language.isoenen
dc.titleCrustal-scale degassing due to magma system destabilization and magma-gas decoupling at Soufrière Hills Volcano, Montserraten
dc.typeJournal Article
plymouth.issue9en
plymouth.volume16en
plymouth.publication-statusPublisheden
plymouth.journalGeochemistry, Geophysics, Geosystemsen
dc.identifier.doi10.1002/2015GC005791en
plymouth.organisational-group/Plymouth
plymouth.organisational-group/Plymouth/Faculty of Science and Engineering
plymouth.organisational-group/Plymouth/Faculty of Science and Engineering/School of Geography, Earth and Environmental Sciences
plymouth.organisational-group/Plymouth/REF 2021 Researchers by UoA
plymouth.organisational-group/Plymouth/REF 2021 Researchers by UoA/UoA07 Earth Systems and Environmental Sciences
plymouth.organisational-group/Plymouth/Users by role
plymouth.organisational-group/Plymouth/Users by role/Academics
dc.identifier.eissn1525-2027en
dc.rights.embargoperiodNot knownen
rioxxterms.versionofrecord10.1002/2015GC005791en
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.typeJournal Article/Reviewen


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