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dc.contributor.advisorWhittington, Alan G.en_US
dc.contributor.authorRomine, Williamen_US
dc.coverage.spatialCalifornia -- Mono Craters
dc.date.issued2008eng
dc.date.submitted2008 Fallen
dc.descriptionThe entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file.en_US
dc.descriptionTitle from PDF of title page (University of Missouri--Columbia, viewed on October 5, 2009).en_US
dc.descriptionThesis advisor: Dr. Alan G. Whittington.en_US
dc.descriptionIncludes bibliographical references.en_US
dc.descriptionM.S. University of Missouri--Columbia 2008.en_US
dc.descriptionDissertations, Academic -- University of Missouri--Columbia -- Geological sciences.en_US
dc.description.abstractThe nature of volcanic processes, including rate of magma ascent, exsolution of volatiles, eruption style, and flow distance, is highly dependent on the viscosity of the associated magma and its ability to transfer heat. We present measurements of the viscosity and thermal diffusivity of Quaternary rhyolitic lava flows from Mono Craters, California. We quantify the effects of temperature, dissolved water content, and crystallinity on viscosity and thermal diffusivity. We use the parallel plate and concentric cylinder methods to obtain viscosity measurements between 5 x 103̂ to 8 x 101̂2 Pas, from superliquidus conditions to the glass transition; the laser flash (LFA) method to measure thermal diffusivity of samples between room and subliquidus temperatures. The investigated obsidian samples, collected from three different flow lobes, contain between 0.1 and 1.1 wt.% H2O, and less than 2 vol.% crystals. We also remelted one sample from each lobe in a muffle furnace to produce nearly anhydrous, crystal free glass. We fit our viscosity data to four literature models relevant to rhyolitic melts, two developed specifically for rhyolites and two global models. We add to this by presenting our own models based on the empirical TVF equation and the theory-based Adam-Gibbs equation, finding that the Adam- Gibbs model fits our data slightly better. We also present a model relating the thermal diffusivity of the samples to their crystal contents and temperatures below the glass transition. Water has a negligible effect on thermal diffusivity at the low concentrations in the samples studied.en_US
dc.identifier.merlin.b7154639xen_US
dc.identifier.oclc449231138en_US
dc.identifier.otherRomineW-111008-T11931en_US
dc.identifier.urihttp://hdl.handle.net/10355/5685
dc.publisherUniversity of Missouri--Columbiaen_US
dc.relation.ispartof2008 Freely available theses (MU)en_US
dc.relation.ispartofcommunityUniversity of Missouri-Columbia. Graduate School. Theses and Dissertations. Theses. 2008 Theses
dc.subject.lcshHeat -- Transmissionen_US
dc.subject.lcshThermal diffusivityen_US
dc.subject.lcshRhyoliteen_US
dc.subject.lcshVolcanic ash, tuff, etc. -- Viscosityen_US
dc.titleFlow and heat transfer properties of Mono Craters rhyolites: effects of temperature, water content, and crystallinityen_US
dc.typeThesisen_US
thesis.degree.disciplineGeological sciencesen_US
thesis.degree.disciplineGeological scienceseng
thesis.degree.grantorUniversity of Missouri--Columbiaen_US
thesis.degree.levelMastersen_US
thesis.degree.nameM.S.en_US


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