Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/7599
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dc.contributor.authorallCimarelli, C.; Department für Geo‐ und Umweltwissenschaften, Ludwig‐Maximilians‐Universität München, Germanyen
dc.contributor.authorallCosta, A.; Istituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italiaen
dc.contributor.authorallMueller, S.; School of Earth Sciences, University of Bristol, UKen
dc.contributor.authorallMader, H. M.; School of Earth Sciences, University of Bristol, UKen
dc.date.accessioned2012-01-27T08:28:10Zen
dc.date.available2012-01-27T08:28:10Zen
dc.date.issued2011-07-28en
dc.identifier.urihttp://hdl.handle.net/2122/7599en
dc.description.abstractMagmas in volcanic conduits commonly contain microlites in association with preexisting phenocrysts, as often indicated by volcanic rock textures. In this study, we present two different experiments that investigate the flow behavior of these bidisperse systems. In the first experiments, rotational rheometric methods are used to determine the rheology of monodisperse and polydisperse suspensions consisting of smaller, prolate particles (microlites) and larger, equant particles (phenocrysts) in a bubble‐free Newtonian liquid (silicate melt). Our data show that increasing the relative proportion of prolate microlites to equant phenocrysts in a magma at constant total particle content can increase the relative viscosity by up to three orders of magnitude. Consequently, the rheological effect of particles in magmas cannot be modeled by assuming a monodisperse population of particles. We propose a new model that uses interpolated parameters based on the relative proportions of small and large particles and produces a considerably improved fit to the data than earlier models. In a second series of experiments we investigate the textures produced by shearing bimodal suspensions in gradually solidifying epoxy resin in a concentric cylinder setup. The resulting textures show the prolate particles are aligned with the flow lines and spherical particles are found in well‐organized strings, with sphere‐depleted shear bands in high‐shear regions. These observations may explain the measured variation in the shear thinning and yield stress behavior with increasing solid fraction and particle aspect ratio. The implications for magma flow are discussed, and rheological results and textural observations are compared with observations on natural samples.en
dc.language.isoEnglishen
dc.publisher.nameAGUen
dc.relation.ispartofGeochemistry, Geophysics, Geosystemsen
dc.relation.ispartofseries7/12(2011)en
dc.subjectanalog experimentsen
dc.subjectcrystal bearingen
dc.subjectpolydisperse suspensionsen
dc.subjectrheologyen
dc.titleRheology of magmas with bimodal crystal size and shape distributions: Insights from analog experimentsen
dc.typearticleen
dc.description.statusPublisheden
dc.type.QualityControlPeer-revieweden
dc.description.pagenumberQ07024en
dc.subject.INGV04. Solid Earth::04.08. Volcanology::04.08.99. General or miscellaneousen
dc.identifier.doi10.1029/2011GC003606en
dc.description.obiettivoSpecifico3.6. Fisica del vulcanismoen
dc.description.journalTypeJCR Journalen
dc.description.fulltextrestricteden
dc.contributor.authorCimarelli, C.en
dc.contributor.authorCosta, A.en
dc.contributor.authorMueller, S.en
dc.contributor.authorMader, H. M.en
dc.contributor.departmentDepartment für Geo‐ und Umweltwissenschaften, Ludwig‐Maximilians‐Universität München, Germanyen
dc.contributor.departmentIstituto Nazionale di Geofisica e Vulcanologia, Sezione OV, Napoli, Italiaen
dc.contributor.departmentSchool of Earth Sciences, University of Bristol, UKen
dc.contributor.departmentSchool of Earth Sciences, University of Bristol, UKen
item.openairetypearticle-
item.cerifentitytypePublications-
item.languageiso639-1en-
item.grantfulltextrestricted-
item.openairecristypehttp://purl.org/coar/resource_type/c_18cf-
item.fulltextWith Fulltext-
crisitem.author.deptIstituto Nazionale di Geofisica e Vulcanologia (INGV), Sezione Bologna, Bologna, Italia-
crisitem.author.deptLudwig-Maximilians-Universität (LMU) München, Earth and Environmental Sciences, Munich, Germany.-
crisitem.author.deptUniversity of Bristol-
crisitem.author.orcid0000-0002-5707-5930-
crisitem.author.orcid0000-0002-4987-6471-
crisitem.author.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
crisitem.classification.parent04. Solid Earth-
crisitem.department.parentorgIstituto Nazionale di Geofisica e Vulcanologia-
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