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 183 for “"Magmatism"”.
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Continental Magmatism and Dynamic Topography
… geochemical compositions of intracontinental magmatism and geophysical, geomorphological and geodetic observations of dynamic uplift. Three volcanic regions are considered in detail: western North America, northeast Brazil and Madagascar. The combined database includes 348 new whole-rock …
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Duality of magmatism at Kirkland Lake, Ontario, Canada.
One of the world's most productive gold camps is located along the major east-trending Larder Lake fault (LLF), which extends approximately 250km from Val d'Or to Kirkland Lake. The western portion of the LLF consists of a 60 km long narrow (less than 5 km wide) and sinuous deformation zone …
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Global Relationships Between Intraplate Magmatism and Dynamic Topography
… of longitudinal river profiles. Cenozoic magmatism of Australia is manifest both as linear chains of volcanoes and seamounts, which track the passage of mantle plumes beneath the plate, and suites of non-age-progressive volcanic fields. 76 new samples were collected and analysed from both …
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Pan-African magmatism and regional tectonics of South Brazil
The Dam Feliciano Belt is a Pan-African mobile belt from the Ribeira orogen of southern Brazil. A detailed field and geochemical traverse along the BR392 road section between Pelotas and Caҫapava do Sul identifies two major tectonic domains; the Pelotas Batholith and the Santana Metamorphic Belt, …
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Arc magmatism at different crustal levels, North Cascades, WA
… on a single crustal level. However, the study of magmatism throughout the crust is critical for understanding how magma ascends through and intrudes surrounding crustal material. I present new field, geochronologic and geochemical data from three intrusive complexes emplaced at a range of crustal …
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Cenozoic potassic magmatism and uplift of the Western United States
… is proposed for non-extensional, uplift-related, magmatism within the Western Cordillera. <br></br><br></br>The Oligo-Miocene potassic-ultrapotassic lamprophyres of the Navajo Volcanic Field, Colorado Plateau, and the late Miocene-Pliocene shoshonites of the San Joaquin- Kings Volcanic Field, …
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Geochemistry of Variscan lamprophyre magmatism in the Saxo-Thuringian Zone
Lamprophyres are mantle-derived magmatic rocks, commonly occurring as dikes. They are readily identified from their field setting, petrography, chemical and mineralogical composition. These rocks not only provide important information on melting processes in the mantle, but also on geodynamic …
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Basalt Magmatism as a Key to Unlocking Cenozoic Dynamic Topography
… can be gained by analysing Cenozoic basalt magmatism, which correlate with convectively driven regional uplift across the globe. This dissertation comprises three regional studies. First, Neogene-Quaternary magmatism of the Western Mediterranean region is analysed within a mantle …
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Insights from geodynamic models into ice flow, mantle magmatism, and their interactions
In this thesis, I use geodynamic models to study processes within the Earth’s mantle and cryosphere. I begin by quantifying previously unconsidered sources of magmatic CO2. In Chapter 2, I predict how small concentrations of CO2 found in passively upwelling mantle throughout ocean basins may …
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Magmatism in southern Uruguay and the early rifting of the South Atlantic
… to the rates ca1cuIated for the waning stages of magmatism on the Serra Geral escarpment, southern Brazil. These rates are consistent with the notion that by this time the principal melt production was located in the newly forming ocean with Uruguay at the margins of the influence of the plume.
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Insights from geodynamic models into ice flow, mantle magmatism, and their interactions
In this thesis, I use geodynamic models to study processes within the Earth's mantle and cryosphere. I begin by quantifying previously unconsidered sources of magmatic CO₂. In Chapter 2, I predict how small concentrations of CO₂ found in passively upwelling mantle throughout ocean basins may …
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Magmatism and dynamics of continental breakup in the presence of a mantle plume
This thesis studies the dynamics of mantle melting during continental breakups by geophysical, geochemical, and numerical analyses. The first part focuses on the mantle melting and crustal accretion processes during the formation of the Southeast Greenland margin, on the basis of deep-crustal …
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Mafic magmatism in the Eastern Cordillera and Putumayo Basin, Colombia : causes and consequences
… work is focused on the study of the Cretaceous magmatism with the intention to understand the processes causing the genesis of these rocks and their significance in the regional tectonic setting of the Northern Andes. The magmatic rocks cut the Cretaceous sedimentary succession of black shales …
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Origin and timing of magmatism and mineralization in the Cripple Creek district, Colorado
Includes bibliographical references.
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Decarbonization related to continental arc magmatism as a possible mechanism for Cretaceous warming
… examines the possibility of continental arc magmatism as a mechanism for CO2 release, specifically as a volatile produced during crustal assimilation and contact metamorphism of carbonates around plutons. Bedrock maps of the North American Cordillera (a region of active continental arc …
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Magmatism and dynamics of continental breakup in the presence of a mantle plume
This thesis studies the dynamics of mantle melting during continental breakups by geophysical, geochemical, and numerical analyses. The first part focuses on the mantle melting and crustal accretion processes during the formation of the Southeast Greenland margin, on the basis of deep-crustal …
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High-resolution temporal records of magmatism, sedimentation, and faulting at evolving plate boundaries
… the spatial and temporal distribution of magmatism, deformation, and sedimentation during Paleogene ridge-trench interaction in western Washington. Chapter 1 creates a regional stratigraphy for nonmarine sedimentary and volcanic rocks throughout central and western Washington and …
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