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 116 for “"Dyke"”.
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The geochemistry, kinematics and geodynamics of the Gannakouriep dyke swarm
The Gannakouriep dyke swarm comprises a linear swarm of north to northeast striking mafic dykes emplaced during late Proterozoic rifting in the Gariep belt. The swarm has a strike length of over 300 km crossing terrane boundaries of the Gordonia sub-province, Richtersveld igneous sub-province and 8 …
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Petrogenesis of the False Bay dyke swarm, Cape Peninsula, South Africa
The False Bay dyke swarm is the southern-most set of Early Cretaceous dolerite dyke intrusions along the western margin of southern Africa associated with rifting of Gondwana and opening of the South Atlantic Ocean. Previous work highlighted the evolution of a single magma type from …
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The petrology of the Elephant's Head dyke and New Amalfi sheet
The following is a detailed study of two allied intrusions of Karroo dolerite, situated in the Matatiele district of East Griqualand (South Africa). The one intrusion is a multiple dike of exceptional form and great length. It served as the main feeder of the second intrusion, a thick transgressive …
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Origin and Emplacement Mechanisms of the Slieve Gullion Ring Dyke Complex, Ireland
… study the rock units of the Slieve Gullion ring dyke complex, to determine their composition, structure and position within the stratigraphic sequence; as well as producing a model for the emplacement of these units. A combination of detailed field observations, mapping, rock sample collection …
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Dyke-induced earthquakes during the 2014-15 Bárðarbunga-Holuhraun rifting event, Iceland
Understanding dykes is vital as they serve both as bodies that build the crust and as conduits that feed eruptions. The 2014-15 Bárðarbunga-Holuhraun rifting event comprised the best-monitored dyke intrusion to date and the largest eruption in Iceland in 230 years. Over a 13 day period magma …
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A study of unusual diamonds from the George Creek K1 Kimberlite dyke, Colorado
… from the George Creek Kl (section 28) kimberlite dyke in Colorado reveal complex intergrowth relationships between CO?-free and CO?-bearing diamond growth generations. The distribution of the CO?-bearing diamond in some specimens suggests that this generation is younger than the CO?-free diamond …
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Petrogenesis of the Swartruggens and Star Group II kimberlite dyke swarms, South Africa
… Group II, diamondiferous, hypabyssal kimerlite dyke swarms, situated in the Northern Province and the Free State respectively, South Africa. Representative samples from all dykes exposed in the mining operations, the Main and Changhouse Dykes, South Fissure and the barren Muil Dyke at …
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Playing on-line : sexual subjectivity, gender play and the construction of the dyke SM fantasy
… and mediation; the erotic interplay between the dyke SM fantasy, sexual and gender identity and the computer mediated communication practices of on-line chatting and email correspondence. The dyke SM fantasy, when toyed with in cyberspace produces a multiplicity and fluidity of sexual and gender …
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The Sheeted Dyke-Gabbro Transition Zone: the Key to Unravelling the Palaeomagnetic Record of the Oman Ophiolite
… lower crustal gabbros, and upper crustal sheeted dykes and lava flows. Previous palaeomagnetic studies have suggested that the southern massifs of the ophiolite were affected by a large-scale remagnetization event during emplacement, which completely replaced original remanences acquired during …
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A Process Mineralogical Study on the effect of Alteration on the Flotation of Great Dyke Platinum Group Element (PGE) Ores
… mineralogical differences between three Great Dyke platinum group element (PGE) ores in Zimbabwe. These ores are known to be characterized by extensive oxidation and alteration resulting in numerous metallurgical challenges in recovering the PGE. The behaviour of three different ores sampled …
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Metamorphism and Deformation in Early Proterozoic Basic Dykes Near Scourie, Northwest Scotland (Amphibolite)
Early Proterozoic amphibolite dykes of the Scourie Dyke swarm, exposed in the transitional Archean to Proterozoic Lewisian basement near Scourie, Northwest Scotland, exhibit complex morphologies, mineralogies, and microfabrics. Dyke morphology is often highly variable, and was controlled to a large …
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The 2014-15 Bárðarbunga-Holuhraun magmatic rifting episode: A seismic study
… central Iceland. Over the course of two weeks a dyke propagated 48 km beneath the glacier northeastwards and into the Holuhraun lava field, where it erupted for six months, becoming the largest eruption in Iceland for over 200 years. During this time, a gradual, incremental caldera collapse took …
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Butch, Femme, Dyke, Or Lipstick, Aren't All Lesbians The Same?: An Exploration Of Labels And "Looks" Among Lesbians In The U.S. South
<p>This thesis is an exploratory qualitative sociological analysis of gender, sexuality, and race among "out" lesbians in the U.S. south. In this thesis, I explore the following questions: (1) what labels are self-identified lesbians in the south using and/or applying to themselves, and how do they …
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Magma emplacement and deformation in rhyolitic dykes : insight into magmatic outgassing
Exposed rhyolitic dykes at eroded volcanoes arguably provide in situ records of conduit processes during rhyolitic eruptions, thus bridging the gap between surface and sub-surface processes. This study involved micro- to macro-scale analysis of the textures and water content within shallow …
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Tertiary and carboniferous magmatism around Lundy Island and the outer Bristol Channel - a geophysical and geochemical perspective
… of continental flood basalts and regional dyke swarms. The Lundy Island is the southern most expression of Tertiary volcanism and consists of granite intruded by around 200 dykes and associated with positive gravity and magnetic anomalies. The Lundy Dyke Swarm comprises basalt/dolerite and …
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Seismicity associated with magmatic intrusions: insights from the Reykjanes Peninsula, southwest Iceland
… during the February - March 2021 Fagradalsfjall dyke intrusion, which preceded the peninsula’s first eruption for almost 800 years. A catalogue of over 80,000 earthquake hypocentres was produced covering the 9.5 km-long two-segment dyke throughout three-week period of dyking. Through a …
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Kimberlites of the central Cape Province, RSA [Vol.2]
… (3o0 3s' .. s, 23°2s 1 E) Two kimberlites, a dyke 1-:'S, 5 ' 6 and a pipe <?.t'~ 8 occur irr.lTl.ediately W and SW of Britstown respectively. Both are of unknown .extentl though pitting3 has proved kimberlitel,3. The dyke, on the western fringes of the town a.nd just south of the road to …
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