Show simple item record

dc.contributor.authorHorwell, CJ
dc.contributor.authorHillman, SE
dc.contributor.authorCole, Paul
dc.contributor.authorLoughlin, SC
dc.contributor.authorLlewellin, EW
dc.contributor.authorDamby, DE
dc.contributor.authorChristopher, TE
dc.date.accessioned2016-05-12T10:50:14Z
dc.date.available2016-05-12T10:50:14Z
dc.date.issued2014-01
dc.identifier.issn0435-4052
dc.identifier.issn2041-4722
dc.identifier.urihttp://hdl.handle.net/10026.1/4614
dc.description.abstract

<jats:title>Abstract</jats:title><jats:p>The Soufrière Hills Volcano (SHV) crystallizes cristobalite (crystalline silica) in its lava domes, and inhalation of cristobalite-rich ash may pose a chronic respiratory hazard. We investigate the causes of variation in cristobalite abundance (measured by X-ray diffraction) in ash from dome collapses, explosions and ash venting from 1997 to 2010.</jats:p><jats:p>Cristobalite abundance in bulk dome-collapse ash varies between 4 and 23 wt%. During periods of slow lava extrusion (&lt;5 m<jats:sup>3</jats:sup> s<jats:sup>−1</jats:sup>), cristobalite is abundant (7–23 wt%), which we attribute to extensive devitrification in slow-cooling lava; it can also form rapidly (15 wt% in 2 months), but we find no correlation between cristobalite abundance and dome residence time (DRT). By contrast, during rapid extrusion (&gt;5 m<jats:sup>3</jats:sup> s<jats:sup>−1</jats:sup>), cristobalite abundance is low (4–7 wt%, similar to that associated with Vulcanian explosions), and correlates strongly with DRT. We attribute this correlation to progressive vapour-phase mineralization or devitrification, and the lack of contamination by older lava. Cristobalite abundance is expected to be &gt;7 wt% for collapse of slowly extruded lava, for ash venting through a dome or for incorporation of hydrothermally altered edifice during explosions; cristobalite abundance is expected to be &lt;7 wt% for collapse of rapidly extruded lava, for ash venting without dome incorporation and from Vulcanian explosions at SHV.</jats:p>

dc.format.extent399-406
dc.languageen
dc.language.isoen
dc.publisherGeological Society of London
dc.titleChapter 21 Controls on variations in cristobalite abundance in ash generated by the Soufrière Hills Volcano, Montserrat in the period 1997 to 2010
dc.typejournal-article
plymouth.issue1
plymouth.volume39
plymouth.publication-statusPublished
plymouth.journalGeological Society, London, Memoirs
dc.identifier.doi10.1144/m39.21
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.eissn2041-4722
dc.rights.embargoperiodNot known
rioxxterms.versionofrecord10.1144/m39.21
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserved
rioxxterms.typeJournal Article/Review


Files in this item

Thumbnail
Thumbnail

This item appears in the following Collection(s)

Show simple item record


All items in PEARL are protected by copyright law.
Author manuscripts deposited to comply with open access mandates are made available in accordance with publisher policies. Please cite only the published version using the details provided on the item record or document. In the absence of an open licence (e.g. Creative Commons), permissions for further reuse of content should be sought from the publisher or author.
Theme by 
Atmire NV