Thesis (Ph.D.) - James Cook University, 2002. / Typescript (photocopy) Includes bibliography.

Thesis (doctoral)--Université de Rennes, 2004. / Includes bibliographical references (p. 405-423). Also available on the World Wide Web.

Thesis (Ph. D.)--University of Hong Kong, 2009. / Includes bibliographical references (leaf 200-224) Also available in print.

Thesis (Ph.D.) -- Memorial University of Newfoundland, 1990. / Typescript. Bibliography: leaves 474-496. Also available online.

Thesis (M.Sc.)--University of Alberta, 2010. / Title from PDF file main screen (viewed on July 2, 2010). A thesis submitted to the Faculty of Graduate Studies and Research in partial fulfillment of the requirements for the degree of Master of Science, Department of Earth & Atmospheric Sciences, University of Alberta. Includes bibliographical references.

Magmatism is a critical process throughout the geological history of Earth and Mars, and one of the few processes capable of producing significant changes in the Martian surface and subsurface past the Noachian. The interaction between mafic magmatism and host rock has the potential to contribute to the surface volatile species, chief among which is sulfur. On Earth, mafic magmas intruding sulfur-rich sediments are rare; however, sulfur–rich soils exist with a near global extent on Mars, and evidence exists for both recent and ancient mafic magmatism. The intrusion of mafic magmas into sulfur-rich sediments is therefore expected on Mars, and is especially pertinent concerning proposed landing site for the ESA ExoMars mission, and the landing site of the NASA Mars 2020 mission, both of which are in proximity to a potential volcanic capping unit in direct contact with sulfate bearing sediments. Here we investigate a terrestrial analog in the San Rafael Swell on the Colorado Plateau in which numerous mafic dikes intrude, alter, and bake sulfur-rich sediments. Mafic dikes intruding the Curtis, Entrada Sandstone, and Carmel Formations act as analogs for volcanic/sediment interaction on Mars, specifically for Jezero Crater, Mawrth Vallis, and N-E Syrtis Major. Using Mars relevant instruments, mineralogical changes with respect to distance from the magmatic intrusion, as well as the spatial resolution necessary to detect these changes, are constrained. The investigated analogs are discovered to be dynamic, and similar systems on Mars will likely require both orbital and in-situ measurements to be detected due to resolution constraints.

A dissertation submitted in fulfilment of the requirements for the degree of Master of Science in Geology to the Faculty of Science, at the University of the Witwatersrand, 2019 / The Palaeoproterozoic Baoulé-Mossi domain of the West African Craton in north-central Ivory Coast is crosscut by a north-northeast trending Ferké Batholith, confined by first-order crustal-scale Ferké Shear Zone (FSZ). To present a geodynamic evolution of the FSZ, incorporation of strato-tectonic, geophysical, geochemical, geochronological revisions is pivotal. In the study region, crosscutting relationship resolved that the oldest unit is formed by gneiss that is uncomfortably overlain by volcano-sedimentary sequences which are intruded by post-basin granitoids, i.e. Ferké Batholith. Volcano-sedimentary sequences consist of conglomeratesandstone-siltstone-mudstone succession and meta-volcaniclastic greywacke unit. Intrusive units making up Ferké Batholith include granodioritic gneiss, granodiorite, granite, tonalite, diorite and pegmatite. U-Pb zircon analysis of samples from the orthogneiss gave a crystallization age of the orthogneiss at 2282 ± 4 Ma, and these were affected by Dext extensional phase around 2132 ± 12 Ma that resulted in basin formation. Fining-upwards volcano-sedimentary sequences were deposited in the extensional-subsiding setting between 2109–2079 Ma. At 2097 Ma, Ferké Batholith emplacement was coeval with the formation of the FSZ. Four main deformational events were recognised crosscutting these rock units. D1 is a progressive deformation event that is dominated by ductile-brittle structures that formed at ~2097 Ma, and is responsible for development of north-northeast trending sinistral shear zones, steeply dipping foliation (S1 and S1-C), sub-horizontal L1 lineation and tight F1 folds. Ferké Batholith emplacement is constrained between 2097 and 1842 Ma U-Pb ages supported by crosscutting relationships. U-Pb age of 2097 Ma constrains D1 and minimum age for deposition of metasedimentary units. Late D1 structures are defined by northwest trending sub-vertical displaced fractures. Northwest trending dilational jogs and sigmoidal en-echelon fractures were formed during late D1. D1 event is related to north-northwest and south-southeast directed principal compressive strain axis. The D2 structures comprise northwest trending F2 folds and foliation (S2) from refolding of D1 structures S1 and F1. Dextral sense of displacement from north-northeast trending shear zones and L2 lineation along the Ferké-Bandama branch developed during D2. West, northwest and west-northwest trending veins (V2) are associated with D2 deformation. Kinematic analysis indicated that the principal compressive strain axis was northnortheast or northeast directed during D2 deformation. iii Brittle fractures, including the northwest to west trending fractures and faults formed the third generation of structure (D3). The traces of D3 structures crosscut those of D1 and D2 features throughout the study area. Northwest sinistral en echelon structures and northeast trending displaced fractures correlate with D3 characteristics i.e. overall north-northeast to northeast maximum shortening direction. Geochemical data show that various granitoids making up the Ferké Batholith are true granites. These intrusive units geochemical character shows calc-alkaline affinities with a very high-K character, mostly I-type and peraluminous composition. Tectonic discrimination diagrams confine the batholith within syn-collision fields. Gold mineralisation associated with FSZ occurs in the metasedimentary units to the southwest (Tortiya region) and northeast (north of Kouloukorosso) of the Ferké Batholith. These regions are structurally controlled and spatially associated with FSZ and hydrothermal veins that formed in response to the regional extensional stress field. The shape of the batholith and/or shear zone sense of displacement permits releasing bends (normal faults) to develop in the regions of Tortiya and Kouloukorosso. / TL (2020)

Ph.D. / Preserved Archean crust dominantly recording lower temperature conditions (greenschist to amphibolites facies), the earliest widespread record of ultrahigh- temperature metamorphism occur in the Neoarchean. Considering that, collisional tectonic setting has been postulated as a possible tectonic scenario for the generation of ultrahigh-temperature metamorphism, sites where Archean cratons underwent collision can be potential sites for preservation of ultrahigh-temperature metamorphic granulites. The Limpopo Complex is a high-grade metamorphic terrain considered to have formed by collision in Neoarchean time between the Archean Kaapvaal and Zimbabwe cratons.Detailed petrographic and mineral chemical characterization of representative high Mg-Al granulites from the Southern Marginal Zone, Central Zone and the Northern Marginal Zone – forming the three subzones of the Limpopo Complex – was carried out. Evidence for the preservation of mineral assemblages considered diagnostic of ultrahigh- temperature metamorphic conditions, such as orthopyroxene+sillimanite±quartz, high-Al/(MgTs) orthopyroxene, sapphirine+quartz, spinel+quartz, corundum+quartz and antiperthite, are shown from these high Mg-Al granulites. Most of these mineral assemblages are reported for the first time from the Limpopo Complex. In addition, two unique textures are also reported – one, the discovery of corundum lamellar intergrowth with orthopyroxene from a high Mg-Al granulite from the Southern Marginal Zone, and second, the rare occurrence of sapphirine+quartz post dating orthopyroxene+sillimanite±quartz from two Mg-Al granulites from the Central Zone. Pressure-temperature calculations including representative P-T phase diagrams computed for the bulk compositions of the granulites studied clearly indicate ultrahigh- temperature conditions for all the three subzones. In contrast to two previous studies, one each for the Southern Marginal Zone (~950°C) and the Central Zone (~930°C), this study presents higher temperature estimates of ~1050 to ~1100°C for the three subzones. Together with examples of ultrahigh-temperature metamorphic conditions reported by the two previous studies, this study shows that the ultrahigh-temperature event reported here has affected the length and breadth of the three subzones of the Limpopo Complex. Further, the high-pressure conditions inferred from the early composition of orthopyroxene from the unique orthopyroxene-corundum intergrowth and the P-T phase diagrams computed for representative granulites from the three zones suggest a common high pressure event in all the three sub zones of the Limpopo Complex.

Thesis (M.S.)--Oregon State University, 2007. / Printout. Includes bibliographical references (leaves 178-186). Also available on the World Wide Web.

Thesis (Ph. D.)--University of Canterbury, 2003. / Typescript (photocopy). Includes bibliographical references (leaves 250-261). Also available via the World Wide Web