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dc.contributor.advisorNabelek, Peter Igoreng
dc.contributor.authorGammel, Elizabeth M.eng
dc.coverage.spatialCalifornia -- San Diego Countyeng
dc.date.issued2014eng
dc.date.submitted2014 Springeng
dc.description"May 2014."eng
dc.descriptionThesis advisor: Professor Peter I. Nabelek.eng
dc.description.abstractThe San Diego County pegmatites occur in the Mesozoic Peninsular Ranges Batholith that stretches from southwestern California to Baja California, Mexico. These zoned, lithium-cesium-tantalum type pegmatite dikes intruded between 2 and 3 kbar and thus contain miaroles, or "pockets," that may contain gem-quality minerals including euhedral quartz, elbaite tourmaline, and spodumene. Feldspars in pockets are usually altered to kaolinite. This study investigates the role that fluid-soluble elements, Li, B, Cl, and F, have in controlling the mineralogy of pegmatites and subsolidus alteration includes two of these pegmatites: the gem-bearing San Diego and the more barren La Posta pegmatite suites. The fluxing properties of Li and B in melt, in particular, may be responsible for increasing water solubility in pegmatite melts, and therefore the development of large pockets that form by accumulation of aqueous fluids near centers of dikes. Pressure-corrected microthermometric homogenization temperatures >350 ??C of primary fluid inclusions in intermediate morphologic zones support sub-thermodynamic solidus crystallization of the pegmatites. Chemical analysis of fluid inclusions by laserablation inductively coupled plasma mass spectrometry (LA-ICP-MS) and ion chromatography (IC) reveals that Li, B, Na, Cl, and F are all components in both pegmatite systems. Li concentrations in the San Diego pegmatite range between 0-51 atom % (relative to all detected cations) and B ranges from 10-65 at.%. In the La Posta pegmatite, inclusions contain significantly less Li, but B is a large component (up to 50 at.%). Significant Ca (up to 10 at.%) is also present in primary fluid inclusions. In both pegmatites, secondary inclusions, thought to represent fluids that equilibrated with feldspars after crystallization, are dominated by Na. The fluid inclusion data shows that in the San Diego pegmatite Li was highly concentrated in residual liquids and separated aqueous fluids, which ultimately led to crystallization of Li-rich minerals ieng
dc.description.bibrefIncludes bibliographical references (pages 50-54).eng
dc.format.extent1 online resource (x, 59 pages) : illustrations (some color), maps (some color)eng
dc.identifier.merlinb106938630eng
dc.identifier.oclc900024157eng
dc.identifier.urihttps://hdl.handle.net/10355/44268
dc.identifier.urihttps://doi.org/10.32469/10355/44268eng
dc.languageEnglisheng
dc.publisherUniversity of Missouri--Columbiaeng
dc.relation.ispartofcommunityUniversity of Missouri-Columbia. Graduate School. Theses and Dissertations. These. 2014 Theses. 2014 Freely available theseseng
dc.subjectAuthor supplied: pegmatite, boron, fluid inclusions, lithium, San Diego, CAeng
dc.subject.lcshIgneous rockseng
dc.subject.lcshLithiumeng
dc.subject.lcshBoroneng
dc.subject.lcshSodiumeng
dc.subject.lcshChlorineeng
dc.subject.lcshFluorineeng
dc.titleRole of Li and B bearing fluids in crystallization and alteration of granitic pegmatites, San Diego, Californiaeng
dc.title.alternativeRole of lithium and boron bearing fluids in crystallization and alteration of granitic pegmatites, San Diego, Californiaeng
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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