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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 111 for “"electron microprobe"”.
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Quantitative compositional mapping with the electron microprobe
Includes bibliographical references (page 108).
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An electron microprobe study of luminescence centers in cassiterite
An electron microprobe equipped with a device for making luminescence measurements has been used to determine the concentration of luminescence activators in zoned cassiterites of hydrothermal origin. Micron-scale growth zones contain variable amounts of Ti, Fe, W and other impurities. The impurity …
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Electron Microprobe and X-Ray Diffraction Study of Natural Idocrase
Made available in DSpace on 2014-12-11T18:09:57Z (GMT). No. of bitstreams: 1 7207078.pdf: 3037853 bytes, checksum: aafc716a41bd573f1db649c5d11795f2 (MD5) Previous issue date: 1971
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Electron Microprobe Study of Diabase-Granite Contact Zones in Composite Dikes, Mount Desert Island, Maine
Made available in DSpace on 2014-12-11T18:09:55Z (GMT). No. of bitstreams: 1 7121240.pdf: 2896233 bytes, checksum: 3ef43ff314bf0174515e82f8a55f24e3 (MD5) Previous issue date: 1971
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Argon and Neon Diffusion in Lunar Impact Glass & The Development of the Electron Microprobe Zircon Fission-Track Dating Technique
<p>This dissertation is subdivided into three independent chapters on low temperature thermochronology. In chapter one a new methodology is presented for dating zircon using the fission-track technique. Chapters two and three describe experiments and modeling to determine the diffusion kinetics of …
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A comparison of iddingsite alteration in two terrestrial basalts and the ALHA 77005 martian meteorite using Raman spectroscopy and electron microprobe analyses.
… the Raman traverses are combined with data from electron microprobe traverses at the same locations to provide information regarding element mobility near the zones of alteration and to confirm mineral identifications made by Raman spectroscopy. This information is used along with petrographic …
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Iron oxidation in (Mg,Fe)0: Calibration of the Flank method on synthetic samples and applications on natural inclusions from lower mantle diamonds
… research is to calibrate the “flank method” by electron microprobe using synthetic (Mg,Fe)O, and then apply the method to determine in situ Fe3+/Fetot in ferropericlase inclusions from lower mantle diamonds. Up to now a calibration of the flank method is available only for garnets. Initially, …
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Aspects of the geology of the mountain ore body, Rosh Pinah mine, Namibia
… light microscopy, staining and quantitative electron-microprobe analyses, carbonate isotope determination and an extensive literature survey.
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Crack coalescence in molded gypsum and Carrara marble
… but not in gypsum. With the use of the scanning electron microprobe (SEM) and the environmental scanning electron microprobe (ESEM) techniques, the development of white patches and their evolution into macroscopic tensile cracks in marble, and the initiation of hair-line tensile cracks and their …
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Micro PIXE analyses of Furnace and Converter Mattes for the determination of trace element distribution and concentrations
… levels of sensitivity are beyond that of the electron microprobe. The objective of these analyses was to examine low level concentrations (ppm or ppb) in phases such as alloys, oxides and sulphides. The analyses were done at the nuclear microprobe chamber of Material Research Group in iThemba …
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The geology and geochemistry of the Etendeka Formation quartz latites, Namibia
… were selected for detailed mineral analyses by electron microprobe.
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The behavior of uranium in the environment : bacterial reduction of an aqueous uranium species
… putrefaciens use aqueous uranium as the electron acceptor in lieu of oxygen. The reduction of U(VI) to U(IV) removes uranium from solution and forms an insoluble compound known as uraninite. Ultraviolet/Visible Spectroscopy was used to analyze uranium ion complexion with several oxazine …
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The geochemistry of a suite of eclogite xenoliths from the Rietfontein Kimberlite, South Africa
… analysed for major element compositions using electron microprobe techniques and garnet and clinopyroxene trace element compositions were determined by Laser Ablation Inductively-Coupled-Plasma Mass Spectrometry (LA-ICP-MS) techniques. Oxygen isotopic compositions of five garnet samples were …
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A pertographic and geochemical study of selected peridotitic and pyroxenitic xenoliths from the three kimberlite localities in the Lac de Gras region, Northwest Territories, Canada
… were determined using a wavelength dispersive electron microprobe, and trace element abundances were determined using laser ablation ICP-MS. Pressures and temperatures of equilibration were then determined using 'garnet-olivine, garnet-orthopyroxene and trace element geothermobarometers (TNi, …
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Later Stone Age Lithic Raw Material Use at Lukenya Hill, Kenya
… GvJm22, and GvJm46 are described and compared. Electron microprobe analysis of obsidian artifacts from GvJm62 identified the source localities of raw materials. Differences in typology and raw material source use among the Lukenya Hill sites show that the sites differed in function, size, and …
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A Targeted Investigation of the Upper Contact Unit of the Sudbury Igneous Complex in the North Range, Sudbury Impact Structure, Canada
… whole rock geochemistry, petrography, and electron microprobe analysis, this study concludes that the SIC upper contact is in fact extensive across the North Range of the SIC. Additionally, the geochemistry of the SIC units, offset dykes, and upper contact unit (UCU) of the SIC presented …
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Garnet-biotite thermometry, garnet-aluminum silicate-silica-plagioclase barometry, and Emp monazite geochronology of the early Proterozoic Ivanpah Mountains, eastern Mojave Desert, Se California
… were recorded by the largest garnet studied; Electron Microprobe Analysis on monazite, using U-Th-Pb radioactive decay, suggest metamorphism occurred between 1752 +/- 86 Ma and 1689 +/- 34 Ma, similar to the age of the Yavapai terrane (∼1.70--1.69 Ma). These ages are constrained from six …
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Sodium metasomatism and magnesio-riebeckite mineralization in the Wilson Ridge pluton
… networks, and diffusive alteration fronts. Electron microprobe analyses of the hydrothermal amphibole reveal a range of Na-rich compositions, most notably magnesio-riebeckite. Magnesio-riebeckite in the Wilson Ridge pluton formed by Na-metasomatism related to subsolidus hydrothermal …
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