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dc.contributor.advisorNabelek, Peter Igoreng
dc.contributor.authorGrzovic, Mark L.eng
dc.contributor.otherUniversity of Missouri-Columbia. Graduate School. Theses and Dissertations. Theses. 2013 Theseseng
dc.date.issued2013eng
dc.date.submitted2013 Springeng
dc.descriptionTitle from PDF of title page (University of Missouri--Columbia, viewed on September 9, 2013).eng
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.eng
dc.descriptionThesis advisor: Dr. Peter I. Nabelekeng
dc.descriptionIncludes bibliographical references.eng
dc.descriptionM.S. University of Missouri--Columbia 2013.eng
dc.descriptionDissertations, Academic -- University of Missouri--Columbia -- Geological sciences.eng
dc.description"May 2013"eng
dc.description.abstractFluid inclusions are potential trapped samples of magmatic fluids, and they therefore provide a way to directly measure the composition of magmatic fluids. Understanding the composition of magmatic fluids is important because the fluids can influence the differentiation of magmas and the mobility of elements within igneous systems. The composite Harney Peak granite-pegmatite pluton (HPG) in the Black Hills, South Dakota, is a good location to study the composition of trapped magmatic fluids because of its unaltered and simple mineralogy. The core of the HPG consists of sills and dikes with biotite as the dominant ferromagnesian mineral, whereas tourmaline is dominant ferromagnesian mineral in the perimeter. In this investigation, fluid inclusions in quartz were measured by microthermometry and laser ablation (LA) ICP-MS to determine the composition of the magmatic fluids in the HPG system. Samples were collected from three locations within the HPG system: the core, the perimeter, and from a tourmaline-poor pegmatite, called the “New” pegmatite. Three types of fluid inclusions were identified: inclusions with H2O+CO2+salts, inclusions with H2O+salts, and CO2-rich inclusions. Compositions of the inclusions show that magmatic fluids emanating from the HPG and pegmatites contained significant concentrations of Na, K, and Li, but variable concentrations of B. In the tourmaline- and biotite-bearing granites, magmatic fluids contained a significant amount of Na, K, and Li, but little or no B. In comparison with the binary NaCl-H2O system, many inclusions of these fluids have depressed eutectic and freezing point depression temperatures, which show their complex compositions. In contrast, fluids in the “New” pegmatite contained relatively little Na, but abundant Li, K and B. These inclusions have elevated eutectic and freezing point depression temperatures. Therefore, the data provides strong evidence that in the tourmaline-bearing granites B was retained in the tourmaline whereas in the “New” pegmatite, B was scavenged from the magma by the low salinity fluid and caused tourmaline growth in its wall rocks. The data supports previous inferences that Li enrichments in contact aureoles of pegmatites in the Black Hills were caused by metasomatism from fluids emanating from the HPG.eng
dc.format.extentviii, 37 pageseng
dc.identifier.urihttp://hdl.handle.net/10355/37940
dc.languageEnglisheng
dc.publisherUniversity of Missouri--Columbiaeng
dc.relation.ispartof2013 Freely available theses (MU)eng
dc.relation.ispartofcollectionUniversity of Missouri--Columbia. Graduate School. Theses and Dissertationseng
dc.source.originalSubmitted by the University of Missouri--Columbia Graduate Schooleng
dc.subjectmagmatic fluidseng
dc.subjectmetasomatismeng
dc.subjectfluid inclusionseng
dc.subjectelement mobilityeng
dc.titleComposition of magmatic fluids in the Harney Peak granite, Black Hills, South Dakotaeng
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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