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dc.contributor.advisorWhittington, Alan G.eng
dc.contributor.authorGetson, Jacquelineeng
dc.date.issued2006eng
dc.date.submitted2006 Summereng
dc.descriptionThe entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file.eng
dc.descriptionTitle from title screen of research.pdf file viewed on (June 25, 2007)eng
dc.descriptionIncludes bibliographical references.eng
dc.descriptionThesis (M.S.) University of Missouri-Columbia 2006.eng
dc.descriptionDissertations, Academic -- University of Missouri--Columbia -- Geological sciences.eng
dc.description.abstractSiO2 (CMAS) glasses were synthesized as analogs for dacitic and basaltic lavas. Liquid viscosities were measured between 101 and 1013 Pa s, over the temperature range of approximately 1600 to 700⁰C, using concentric cylinder and parallel plate viscometry. Phase diagrams combined with calculations of the crystal fraction during cooling were used to calculate the viscosity of the magma as a function of temperature. The results demonstrate that magma viscosities increase during cooling and crystallization as expected. However, in basaltic systems the residual liquid viscosities change little during cooling, due to removal of the anorthite component and the depolymerization of the melt with progressive crystallization. Changing liquid composition counteracts decreasing temperature and increasing crystal content, until the physical effect of crystals begins to dominate at crystal fractions greater than about 40%, assuming crystals remain in the magma. In contrast to basalts, liquid and magma viscosity in dacitic systems always increases during cooling. This suggests that the viscosity of cooling basaltic magma chambers may change little over extended temperature intervals.eng
dc.identifier.merlinb58876157eng
dc.identifier.urihttp://hdl.handle.net/10355/4628
dc.languageEnglisheng
dc.publisherUniversity of Missouri--Columbiaeng
dc.relation.ispartofcollectionUniversity of Missouri--Columbia. Graduate School. Theses and Dissertationseng
dc.subject.lcshPlagioclase -- Viscosityeng
dc.subject.lcshRocks, Igneous -- Viscosityeng
dc.titleEffect of plagioclase crystallization on liquid and magma viscosity in the Anorthite-diopside-dorsterite-quartz systemeng
dc.typeThesiseng
thesis.degree.disciplineGeological sciences (MU)eng
thesis.degree.grantorUniversity of Missouri--Columbiaeng
thesis.degree.levelMasterseng
thesis.degree.nameM.S.eng


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