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UNRAVELING MAGMATIC HISTORIES AT MULTIPLE SCALES

dc.creatorWallrich, Blake Marshall
dc.date.accessioned2020-08-22T17:39:58Z
dc.date.available2019-07-22
dc.date.issued2019-07-22
dc.identifier.urihttps://etd.library.vanderbilt.edu/etd-07192019-134340
dc.identifier.urihttp://hdl.handle.net/1803/13291
dc.description.abstractIn this study, we take a multi-faceted approach to better understand silicic magmatism. The broad questions that we were aiming to address include: (1) How do magmatic systems and silicic magmas evolve through time following supereruptions? (2) Is elemental partitioning in titanite temperature dependent? (3) Can core to rim profiles in crystals provide insight into how late stage silicic melts evolve during the waning stages of magmatism? To address question (1) we investigated post-supereruption silicic magmas that erupted near the source caldera of the Peach Spring Tuff. Glass and phenocryst geochemistry from a suite of post supereruption ignimbrites suggest a transition from cool-wet-oxidizing to hot-dry-reducing magmatic conditions over a ~240 ka period. To address questions (2) and (3) we investigated elemental partitioning between titanite and melt by collecting geochemical analyses of the titanite rims and coexisting glass from a variety of different samples. Our results suggest variation (factor of 2) in partitioning over ~100 ¼C; higher partition coefficients were observed with decreasing temperatures (as recorded by zircon saturation and Zr-in-titanite thermometers). Core to rim transects using the temperature-dependent partitioning model suggest some titanite grains experienced complex crystallization histories, and others experience simple down temperature crystallization histories.
dc.format.mimetypeapplication/pdf
dc.subjectgeochemistry
dc.subjectPost-supereruption
dc.subjectSitgreaves Tuff
dc.subjectmagmatism
dc.subjectHigh-silica rhyolite
dc.subjectTitanite
dc.subjectSphene
dc.subjectPartition coefficients
dc.titleUNRAVELING MAGMATIC HISTORIES AT MULTIPLE SCALES
dc.typethesis
dc.type.materialtext
thesis.degree.nameMS
thesis.degree.levelthesis
thesis.degree.disciplineEarth and Environmental Sciences
thesis.degree.grantorVanderbilt University
local.embargo.terms2019-07-22
local.embargo.lift2019-07-22
dc.contributor.committeeChairGuilherme A.R. Gualda
dc.contributor.committeeChairCalvin Miller


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