Chapter 21 Controls on variations in cristobalite abundance in ash generated by the Soufrière Hills Volcano, Montserrat in the period 1997 to 2010
dc.contributor.author | Horwell, CJ | |
dc.contributor.author | Hillman, SE | |
dc.contributor.author | Cole, Paul | |
dc.contributor.author | Loughlin, SC | |
dc.contributor.author | Llewellin, EW | |
dc.contributor.author | Damby, DE | |
dc.contributor.author | Christopher, TE | |
dc.date.accessioned | 2016-05-12T10:50:14Z | |
dc.date.available | 2016-05-12T10:50:14Z | |
dc.date.issued | 2014-01 | |
dc.identifier.issn | 0435-4052 | |
dc.identifier.issn | 2041-4722 | |
dc.identifier.uri | http://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 (<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 (>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 >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 <7 wt% for collapse of rapidly extruded lava, for ash venting without dome incorporation and from Vulcanian explosions at SHV.</jats:p> | |
dc.format.extent | 399-406 | |
dc.language | en | |
dc.language.iso | en | |
dc.publisher | Geological Society of London | |
dc.title | Chapter 21 Controls on variations in cristobalite abundance in ash generated by the Soufrière Hills Volcano, Montserrat in the period 1997 to 2010 | |
dc.type | journal-article | |
plymouth.issue | 1 | |
plymouth.volume | 39 | |
plymouth.publication-status | Published | |
plymouth.journal | Geological Society, London, Memoirs | |
dc.identifier.doi | 10.1144/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.eissn | 2041-4722 | |
dc.rights.embargoperiod | Not known | |
rioxxterms.versionofrecord | 10.1144/m39.21 | |
rioxxterms.licenseref.uri | http://www.rioxx.net/licenses/all-rights-reserved | |
rioxxterms.type | Journal Article/Review |