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 20 of 406 for “"Geological sciences"”.
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A geophysical investigation of large-scale glaciotectonic deformation, Ludington Ridge, Michigan
… (M.S.)--Michigan State University. Dept. of Geological Sciences, 2008
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Upper paleozoic stratigraphic history and provenance of the Farewell terrane, SW Alaska
… (M.S.)--Michigan State University. Department of Geological Sciences, 2010
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Cross-disciplinary strategies for advancing equity, diversity, and inclusion in geoscience education and workplaces
… investigates systemic marginalization in the geosciences with the aim of creating more inclusive working and learning environments. Geoscience remains one of the least diverse STEM disciplines, shaped by histories of racial, gender-based, and other forms of discrimination. To address these …
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A geochemical investigation of the Lake Sibiya system, Northern Zululand
… analyses were conducted within the Department of Geological Sciences at the University of Cape Town, adhering to standard analytical methods wherever possible.
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Arsenic mobility in a changing northern climate: Implications for geochemical baselines and long-term stability of contaminants in lake systems
… knowledge with our research and teaching of geological sciences and engineering are also explored in this thesis, based on hands-on experience gained through this study.
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From clay slurries to mudrocks : a cryo-SEM investigation of the development of the porosity and microstructure
… reflect the in-situ structure. In the field of geological sciences, this contrasts a fundamental view of fabric evolution that has inferred the presence of honeycomb structures that gradually evolve to an oriented fabric. Furthermore, we developed a method to obtain representative information …
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The hydrochemical and isotopic characterization of groundwater in southern Mozambique
… of strontium were analyzed at the Department of Geological Sciences at the University of Cape Town. The aim of this study was to characterize the isotopic and hydrochemical composition of groundwater in the southern Mozambique study area, using major ions and stable isotopes. Samples were …
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An investigation into the geomorphology of the Hebron Fault, Namibia, using a satellite-derived, high-resolution digital elevation model (DEM)
The Hebron fault scarp in southern Namibia is 45 km in length with an average height of 5.5 m and a maximum height of 8.9 m. Namibia is a Stable Continental Region (SCR) — a slowly deforming area within a continental plate. The country also has little recorded seismicity with the largest earthquake …
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Neogene to quaternary foraminifera from the western margin of southern Africa
The western margin of southern Africa underwent major palaeoceanographic changes since the initiation of the Benguela Upwelling System during the Neogene. Microfossils in marine sediments provide key proxies in our understanding of how the margin evolved. Fossil shells (tests) of foraminifera …
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Classification and petrogenesis of the Tongo dike-01 from the Tongo-Tongoma cluster, Sierra Leone: constraints from bulk rock geochemistry
The Man Craton in West Africa, like the Kaapvaal Craton in southern Africa, hosts diamondiferous kimberlites. However, West African kimberlites are commonly micaceous and unusual relative to archetypal South African kimberlites. Petrographically, they appear more similar to orangeites (aka Group II …
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Petrology and geochemistry of the diamondiferous K-richteriteand leucite-bearing Kareevlei Kaapvaal lamproite
The Kareevlei diamond mine is the first mine on the evolved leucite-bearing Kaapvaal lamproite. These rock types have generally been believed to be non-diamondiferous or at least sub-economic and as a result, their petrogenesis has remained poorly constrained as the exploration programs focused …
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Thermobarometry and geochemistry of peridotite xenoliths from the southwestern margin of the Kaapvaal craton, South Africa
Globally, there are significant contrasts, both thermally and chemically, between peridotite xenoliths exhumed from Archean, and post-Archean terranes. Studies of the thermal structure of the lithosphere, in combination with surface heat flow data, suggest that thermal gradients beneath cratonic …
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A multi-isotopic geochemical investigation of the Lower Zone, Bushveld Complex, South Africa: implications for a crustal component for parental magmas
The current study focuses on the Lower Zone of the Bushveld Complex, South Africa using multiple geochemical and isotopic systems to determine the origin of crustal signatures, i.e. crustal assimilation or recycled crust in the mantle source, present throughout the Rustenburg Layered Suite (RLS) …
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The geochemistry and petrogenesis of lavas from the Comores Archipelago, Western Indian Ocean (Volume 2)
The islands of the Comores Archipelago define a short, NNW-trending, volcanic lineament across the northern entrance to the Mozambique Channel in the western Indian Ocean and are considered to represent the surface expression of the Comores mantle plume. New mineral and bulk-rock analyses, as well …
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Apophyllite weathering and the aqueous geochemistry of a Karoo breccia pipe
Apophyllite is a phyllosilicate mineral commonly associated with hydrothermal environments. It is a major secondary phase occupying fractures in a dolerite breccia pipe on the farm Kopoasfontein, outside Calvinia in the western Karoo, South Africa. Groundwater abstracted from this breccia is …
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Alteration reactions which affect the geochemistry of kimberlite and its xenoliths, and the search for unaltered mantle materials
[Volume 1 - needs to have volume 2 incorporated.] This thesis records a series of attempts to elicit from bulk kimberlites and their xenoliths, geochemical and mineralogical information meaningful with respect to the primary composition of their source in the mantle. Some of these attempts were …
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Contributions to the Study of Lithospheric Deformation and Seismicity in Stable Continental Regions
… How well do they correlate with stresses and geological proxies for rheological variation? The ultimate goal of this study was to better understand stable continental regions like southern Africa, where large earthquakes occur despite not being near plate boundaries, for example the 2017 Mw …
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The petrogenesis and geochemistry of the Namaqualand olivine melilitite pipe cluster, western South Africa
The Namaqualand olivine melilitite pipe cluster is a 40 km by 10 km north/south oriented area with at least 10 closely spaced alkaline ultramafic subvolcanic pipes and diatremes containing olivine melilitite and nephelinite, spanning an age range of 35-56 Ma. A related carbonatite complex …
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Evolution of tectonic and stratigraphic geometries in the Southern Outeniqua Basin
The evolution of the Southern Outeniqua Basin has been analysed within a tectono-stratigraphic framework by the interpretation of 3,700km of 2D seismic data constrained by five exploration wells, drilled on the adjacent shelf. The mapping of different fault families into distinct structural …
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The petrogenesis of Liberian diamondiferous rocks, Man Craton, West Africa
Kimberlites and lamproites are ultramafic igneous rocks believed to originate from the convective asthenosphere and sub-continental lithospheric mantle, respectively, however, the genetic link between these rock types is still a debate among researchers. Recently, it has been shown (e.g., in the …
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