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 10 of 10 for “"Tholeiite"”.
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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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Petrogenesis of the False Bay dyke swarm, Cape Peninsula, South Africa
… evolution of a single magma type from olivine-tholeiite basalt to ferro-tholeiite andesite. This thesis presents detailed field observations of each dyke in the False Bay - Cape Peninsula region and the focus of the study is on the finer details of the differentiation process to define combined …
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The petrology of the Elephant's Head dyke and New Amalfi sheet
… the formation of the dike. A first intrusion of tholeiite magma was followed by the injection of a large volume of olivine-dolerite magma. The tholeiitic phase is absent in the sheet, which only contains the cooled representatives of the olivine-dolerite magma. A considerable degree of magmatic …
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Geochemistry and petrogenesis of unaltered and altered volcanic sequences in the southern Abitibi greenstone belt
… there are numerous, well preserved, komatiite-tholeiite sequences in fault-bounded tectonostratigraphic terranes, or "assemblages". Volcanism commenced at 2750 Ma and terminated at $\sim$2700 Ma. New analyses of relatively fresh komatiites by ICP-MS from the classical Pyke Hill locality for …
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The petrology and geochemistry of the minor intrusions in the central metasedimentary belt, Grenville Province, southern Ontario, Canada.
… and rhyolites, and a Highly Fractionated Tholeiite Suite consisting of a single, unevolved tholeiitic basalt. The geochemical suites were modelled from three distinct sources; two spinel lherzolites and a garnet lherzolite, by partial melting and fractional crystallization. The dykes are …
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Major element and isotopic studies on the James Run/Port Deposit association, Maryland: tectonic analogues and Taconic deformation
… classify the meta-igneous rocks as a bimodal tholeiite-dacite/tonalite suite with trondhjemitic affinities and indicate that subsolidus alteration during dynamic metamorphism was minor. Comparison of these data with other tectonic environments suggests their generation by partial fusion of …
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Temperature-dependent thermal transport properties of major Archean rock types and implications for the thermal evolution of Archean terranes
… [about]0.45 and 0.70 mm2/s for granodiorite and tholeiite basalt respectively by ~1000K. We applied these results to endmember numerical models of the thermal evolution primitive continental crust, and a model of dome-and-keel formation. The results show that a crustal profile with heat …
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The role of C-O-H volatiles in the martian mantle and the production of the martian atmosphere.
… in a less primitive Humphrey rock and a Hawaiian tholeiite. The small sensitivity of CO2 solubility to compositional variations among martian and tholeiitic basalts means that the experimentally determined solubilities may be applicable to a wide spectrum of martian magmatic products. In Chapter …
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Petrogenesis and evolution of alkalic basaltic magmas in a continental intraplate setting: the South Auckland Volcanic Field, New Zealand
… range in composition from basanites to quartz tholeiites. Two basalt groups are distinguished based on their contrasting mineralogical and geochemical characteristics: group A, a less silica-undersaturated transitional basalt to quartz tholeiite suite; and group B, a strongly …
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Timescales of magma residence and transport underneath Iceland
The focus of this thesis is the development and application of a new method of diffusion chronometry known as DFENS (Diffusion chronometry using Finite Elements and Nested Sampling). This method combines a flexible finite element numerical model with a nested sampling Bayesian inversion to provide …