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.
Results
Showing 1 to 19 of 19 for “"Volatile elements"”.
-
The nature and co-behaviour of volatile and non-volatile elements in the sub-continental lithospheric mantle
… mantle represents a critical interface in global volatile cycles because it separates Earth’s convecting mantle from the rigid crust. Nevertheless, the source, abundance and flux of volatiles stored in this reservoir are poorly constrained. In this work, the concentrations of volatiles stored both …
-
An investigation into the determination of some volatile elements in silicate rocks employing d.c. arc emission spectroscopy in artificial atmospheres
The determination of 14 trace elements, namely As, Ag, Bi, Cd, Cu, Ga, Ge, Hg, In, Pb, Sb, Sn, Tl and Zn, in silicate rocks using d.c. arc optical emission spectrography (O.E.S.) and X-ray fluorescence spectroscopy (X.R,F.) was investigated. X.R.F, was shown to be capable of determining Cu, Ga, Pb …
-
Siderophile Element Partitioning at high Pressures and Temperatures : Implications for Core Formation Processes
Abstract Siderophile (Fe-loving) elements are depleted in the Earth´s mantle because they have been extracted into the Earth´s core by core formation processes. Metal – silicate partitioning of siderophile elements can provide major constraints on the conditions that prevailed during core formation …
-
Water and volatile element accretion to the inner planets
… the timing and source(s) of water and volatile elements to the inner solar system by studying the basaltic meteorites angrites and eucrites. In chapters 2 and 3, I present the results from angrite meteorites. Chapter 2 examines the water and volatile element content of the angrite …
-
Water and volatile element accretion to the inner planets
… the timing and source(s) of water and volatile elements to the inner solar system by studying the basaltic meteorites angrites and eucrites. In chapters 2 and 3, I present the results from angrite meteorites. Chapter 2 examines the water and volatile element content of the angrite …
-
Nominally volatile-free mantle minerals: a reservoir for water and fluorine in the Kaapvaal Craton
… mantle acts as a major repository for volatile elements is poorly constrained. This study presents the first systematic investigation into water, fluorine and chlorine storage in nominally volatile-free mantle minerals from sub-cratonic mantle. Full petrologic and chemical …
-
Deep Earth volatile cycles as revealed by basalt chemistry
Earth’s volatiles (e.g. CO$_2$ and H$_2$O) are thought to be stored largely in the interior of the planet. The partitioning of these volatile elements between Earth’s surface and interior controls the evolution of our atmosphere and oceans, acting as a regulator on our planet’s long term climate. …
-
Implementation of Intermittent-robust Computing on RISC-V Architecture
… cores. The framework avoids reliance on non-volatile elements within the processor itself, ensuring CMOS compatibility and scalability. Backup and restore operations are executed concurrently with regular computation, thereby minimizing performance and energy overhead. The framework was …
-
The volatile contents of melt inclusions and implications for mantle degassing and ocean island evolution
The amount of volatile elements dissolved in silicate melts is a controlling factor in a range of geologic processes, which include hazardous volcanic eruptions, economically-significant ore-forming systems, and global-scale volatile fluxes, which contribute to planetary evolution. While melt …
-
Investigating the Distribution and Source(s) of Lunar Volatiles
Following the renewed interest in the volatile inventory of the Moon witnessed in the last decade, from both sample studies and data from orbital missions, it is timely to reassess the distribution and likely source(s) of light element volatiles (C, N, He, Ne, and Ar) in a diverse suite of lunar …
-
The spectra of manganese and zirconium in the wavelength region 0.8 μm [microns] - 2.6 μm [microns or micrometres]
… new methods of preparing tubes containing less volatile elements such as manganese. This involved new design of material containers used inside the reaction line as well as some changes in the reaction system used in the preparation of the tube. Investigations into the phenomenon of Zeeman …
-
Modeling Arsenic, Antimony, And Selenium Partitioning During Coal Combustion
… of pollution associated with coal. Several trace elements liberated from the coal matrix during combustion represent additional pollutants that must be understood and controlled. These elements have a variety of ways in which they are associated within coal, which impacts how they may be released …
-
Exogeology as Revealed by Polluted White Dwarfs
… their atmospheres to become polluted by heavy elements. The relative quantities of these elements contain a wealth of information about the composition of the accreted planetary bodies. This thesis focuses on the interpretation of white dwarf pollution, with the aim of better understanding …
-
Interactions of the Air Electrode with Electrolyte and Interconnect in Solid Oxide Cells
… reactions and vaporization/deposition of some volatile elements — have been investigated in the simulated SOC operating environment. The interactions demonstrate the material degradation mechanisms of the cell components and the effects of different factors such as chemical composition and …
-
Physical and chemical constraints on core - mantle differentiation in terrestrial planets.
… - liquid silicate partitioning behaviour of the elements Ta, Nb, V, Cr, Si, Mn, Ga, In and Zn have been studied experimentally over a wide range of high-P and high-T conditions of 2-24 GPa, 1750-2600°C and at low oxygen fugacities of -1.3 to -4.2 log units below the iron wüstite buffer. With the …
-
The heterogeneity and volatile content of Earth’s mantle, magmas and crust
This thesis explores the volatile content of the mantle, subducted oceanic crust, and arc magmas as well as the structure of slow spreading ocean crust and the heterogeneity of Earth’s upper mantle. In Chapter 2, I directly explore the halogen (F and Cl) content of mantle minerals in situ, then use …
-
Processing, Structure and Properties of High Temperature Thermoelectric Oxide Materials
… 500°C or higher, due to the presence of volatile elements. Oxide thermoelectric materials are considered to be potential candidates for high temperature applications due to their robust thermal and chemical stability in oxidizing atmosphere along with the reduced toxicity, relatively …
-
THE CONCENTRATION OF HYDROGEN IN INCOMPLETELY AND WHOLLY MELTED TERRESTRIAL BUILDING BLOCKS
… on the source(s) of H and other highly volatile elements (HVEs; e.g., H, C, F, Cl, and S) to the bulk Earth can be provided by analyzing meteorites, which are the remnants of early-formed rocky bodies that were present during the accretion of the terrestrial planets. Such samples either …
-
The carbon speciation in the Earth’s interior as function of pressure, temperature and oxygen fugacity
… interior will influence the speciation of volatile elements both in the mantle and in mantle derived magmas. Carbon is one of the principal elements to be affected in this way because under reducing conditions it forms graphite or diamond, and under oxidizing conditions carbonate (or …