Global ETD Search
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 106 for “"Major element"”.
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Major element geochemistry of the Amazon River system
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth and Planetary Sciences, 1980.
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The isotope, trace element, and major element geochemistry of the Mesozoic Appalachian tholeiite province
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1986.
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The petrography and major element geochemistry of the phosphorite nodule deposits on the Agulhas Bank, South Africa
… phase of the phosphorites. Studies on the major element geochemistry of the various phosphorite classes has shown that the bulk geochemistry of the nodules corresponds to the dominant mineralogy and that variations in the bulk geochemistry of the nodules from within a given group reflects …
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Major element diffusion in garnet and the exsolution of majoritic garnet from aluminous enstatite in Earth's Upper Mantle
Majorite is a high pressure polymorph of enstatite with the garnet structure. The amount of enstatite that can be dissolved in garnet as a majorite component increases significantly with pressure, and therefore, majoritic garnet is thought to be a major constituent of the Earth's transition zone. …
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Major element and isotopic studies on the James Run/Port Deposit association, Maryland: tectonic analogues and Taconic deformation
The gneissic Port Deposit pluton and associated James Run metavolcanics bear a fault relation with the Wissahickon metasediments of the Glenarm terrane of the northeastern Maryland Piedmont, USA. Bulk chemical and mineralogical data classify the meta-igneous rocks as a bimodal …
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Chemical stratification of the crust : isotope, trace element, and major element constraints from crustally contaminated lavas and lower crustal xenoliths
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric and Planetary Sciences, 1987.
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Spatial-Statistical Properties of Geochemical Variability as Constraints on Magma Transport and Evolution Processes at Ocean Ridges
… employs spatial and statistical properties of major element variability in basaltic lavas and mantle residues to constrain some of the processes and dynamics occurring beneath ocean ridge magmatic systems. Ocean ridges represent a critical setting for many geochemical fractionation processes …
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"The struggle towards self-fulfillment in comparative perspective: The theme of woman's awakening in three realist novels--Gustave Flaubert's ""Madame Bovary"", Kate Chopin's ""The Awakening"", and Arishima Takeo's ""Aru Onna"""
The struggle for self-fulfillment is a major element in three realistic novels: Gustave Flaubert's Madame Bovary (1857), Kate Chopin's The Awakening (1899), and Arishima Takeo's Aru onna (A Certain Woman) (1919). In these three novels, romantic female characters of the bourgeois class try to free …
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Classification and petrogenesis of the Tongo dike-01 from the Tongo-Tongoma cluster, Sierra Leone: constraints from bulk rock geochemistry
… Leone have been analysed for their bulk-rock major and trace elements as well as Sr-Nd-Pb isotope geochemistry. The primary objectives of this study are: 1) provide detailed petrographic observations of the dike, 2) classify the dike relative to kimberlites worldwide, 3) constrain the …
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Thermobarometry and geochemistry of peridotite xenoliths from the southwestern margin of the Kaapvaal craton, South Africa
… linked to large-scale tectonic processes. Major element P-T results from peridotite xenoliths sampled during Group II kimberlite magmatism (~ 150 Ma), that erupted through the southwestern Proterozoic NamaquaNatal Province record geothermal gradients akin to those of cratonic terranes. In …
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Magmatic processes that generated the rim andesites of Medicine Lake Volcano, N. California
… on a primitive andesite reproduce most of the major element compositional variability exhibited in the high-Na lavas.
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Magmatism and dynamics of continental breakup in the presence of a mantle plume
… igneous province is studied on the basis of the major element chemistry of erupted lavas. A new fractionation correction scheme based on the Ni concentrations of mantle olivine is used to estimate primary melt compositions, which suggest that this province is characterized by a large degree of …
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Magmatism and dynamics of continental breakup in the presence of a mantle plume
… igneous province is studied on the basis of the major element chemistry of erupted lavas. A new fractionation correction scheme based on the Ni concentrations of mantle olivine is used to estimate primary melt compositions, which suggest that this province is characterized by a large degree of …
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The geochemistry of a suite of eclogite xenoliths from the Rietfontein Kimberlite, South Africa
… and secondary minerals were 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 …
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Oxygen and hydrogen isotopic analysis of tourmaline by secondary ion mass spectrometry
… tourmalines), there are large variations in major element composition between species. This study uses three of these tourmaline species (schorl, dravite, and elbaite) to construct calibration curves to correct for IMB during SIMS analysis of O and H isotopes. I have applied my technique to …
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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
… and binocular microscopy was followed by major anti trace element analysis. Major element compositions of individual minerals were determined using a wavelength dispersive electron microprobe, and trace element abundances were determined using laser ablation ICP-MS. Pressures and …
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Development of a leaching procedure for isotopic study of metal/silicate partitioning experiments
… not consistent between all of the samples, and major element concentration measurements will allow identification of the phase being digested in each step. The contamination from silicate and graphite in the metal fractions prevents uranium from being accurately measured.
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Trace element geochemistry of marine biogenic particulate matter
… necessary to prevent contamination for major and trace-chemical analysis. Immediately after collection, the samples were subjected to a series of physical and chemical leaching-decomposition experiments designed to identify the major and trace element composition of particulate carrier …
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Timing and Source of Alkali Enrichment at Mt. Etna, Sicily: Constraints from Clinopyroxene Geobarometry and In Situ SR Isotope Data
… have documented higher abundances of alkali elements (K, Rb, Cs) as well as elevated <sup>87</sup>Sr/<sup>86</sup>Sr in Etnean lavas. The source of this alkali-enrichment has been hotly debated, with end-member hypotheses involving mantle vs. crustal contributions. To further characterize the …
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Low rare earth element concentration impact glass from the K/T Boundary at Beloc
… layer at Beloc that is depleted in rare earth elements (REE) relative to continental crust. It is widely agreed that a large bolide struck the Yucatan Peninsula roughly 65 Ma spreading a worldwide iridium anomaly. However, there is only one case of a piece of the impactor being found (Kyte et …
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