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 36 for “"mantle flow"”.
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Seismic anisotropy and mantle flow beneath Africa and Arabia
… phenomena involve edge-driven small-scale mantle convection and the thermal or dynamic effects of one or more mantle plumes. In this study we use continental scale shear-wave splitting (SWS) measurements to provide additional constraints on the various models of rifting, uplifting, and …
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Quantifying slab evolution and mantle flow using global subduction models with data assimilation
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-05-01
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Dynamics of the North American Plate: Numerical Development, Mantle Flow Modeling, and Receiver Function Analysis
… of the whole plate. Recently, a new generation mantle convection code, ASPECT (Advanced Solver for Problems in Earth ConvecTion) equipped with fully adaptive mesh refinement (AMR) technology opens up the potential to build a multi-scale global mantle flow model with a local high-resolution focus …
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Investigating large-scale mantle flow and its surface expression: a tale of multiscale dynamic interaction shaping earth’s tectonics
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-10-20 without embargo terms
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MANTLE FLOW AND TRANSITION ZONE DISCONTINUITIES BENEATH THE CARRIBEAN PLATE: CONSTRAINTS FROM SHEAR WAVE SPLITTING AND RECEIVER FUNCTION ANALYSES
… lithospheric deformation and asthenospheric flow beneath the boundary zone of the North American and Caribbean plates and adjacent areas. A total of 4915 XKS and 1202 pairs of local S wave splitting parameters were obtained at 24 broad band seismic stations. The XKS observations can be …
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Mantle flow and lithosphere-asthenosphere coupling beneath the southwestern edge of the North American craton: constraints from shear-wave splitting measurements
<p>"High-quality broadband seismic data recorded by the USArray and other stations in the southwestern United States provide a unique opportunity to test different models of anisotropy-forming mechanisms in the vicinity of a cratonic edge. Systematic spatial variations of anisotropic …
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Mantle upwelling, melt generation, and magma transport beneath mid-ocean ridges
… result of a complex geodynamic system in which mantle rises beneath spreading centers and undergoes decompression melting. The melt segregates from the matrix and is focused to the rise axis, where it is eventually intruded and/or erupted to form the oceanic crust. This thesis combines surface …
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A Geodynamic Investigation of Continental Rifting and Mantle Rheology: Madagascar and East African Rift case studies
… rifting, the lack of knowledge of the underlying mantle dynamics, and poor knowl-edge of mantle rheology. Here, we use state-of-art computational modeling of the upper660 km of the Earth to: 1) provide a better understanding of mantle flow patterns and themantle rheology beneath Madagascar, 2) to …
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3D trench-parallel flow in the subduction region and correlation with seismic anisotropy direction
… direction of shear wave, are observed. In the mantle the general assumption is that seismic anisotropy is caused by Lattice Preferred Orientation (LPO) of olivine minerals and that the direction of anisotropy is an indicator of the direction of mantle flow. The complex pattern of seismic …
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The Structure and Behavior of Plate Boundary Regions Through the Wilson Cycle
… constraints on the extent of enriched mantle from upwelling mantle plumes relative to the observed extent of topographic swells related to mantle flow. It builds on this data by presenting a new geophysical model of mantle flow around mantle plumes that constrains the viscosity …
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Two-dimensional, viscous flow modeling of roll-back subduction : numerical investigation into the role of slab density in subduction dynamics
… effort to construct a two-dimensional, viscous flow model of "roll-back" subduction to explicitly examine how slab density influences retreat rate, mantle flow, and slab geometry. For a given lithosphere-mantle density contrast, the model computes the evolution of a viscous, thermal slab using a …
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Dynamics of mantle plumes
Mantle plumes are a link between different scales in the Earth’s mantle: They are an important part of large-scale mantle convection, transporting material and heat from the core-mantle boundary to the surface, but also affect processes on a smaller scale, such as melt generation and transport and …
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Interactions between mantle plumes and mid-ocean ridges : constraints from geophysics, geochemistry, and geodynamical modeling
… interactions between mid-ocean ridges and mantle plumes using geophysics, geochemistry, and geodynamical modeling. Chapter 1 investigates the effects of the Marion and Bouvet hotspots on the ultra-slow spreading, highly-segmented Southwest Indian Ridge (SWIR). Gravity data indicate that …
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Insights from geodynamic models into ice flow, mantle magmatism, and their interactions
… 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 generate low-degree carbonate …
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Insights from geodynamic models into ice flow, mantle magmatism, and their interactions
… 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 generate low-degree carbonate …
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Geophysical insights into the histories of Venus, Mercury and the Moon
… ratios inform models of crustal thickness and mantle density, which in turn have implications for the formation of Venus's highland crust. I perform spatio-spectral localization of gravity and topography on Mercury from the MErcury Surface, Space ENvironment, GEochemistry, and Ranging …
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Understanding late Cenozoic western United States mantle dynamics and surface tectonics using forward-adjoint data assimilation models
Understanding mantle evolution is essential for investigating many processes of the Earth’s surface and interior. A straightforward way to study mantle evolution is through mantle convection simulation. However, a self-consistent and fully dynamic representation of past mantle convection for the …
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Constraints on mantle convection from seismic tomography and flow modeling
… high resolution seismic tomography and realistic flow modeling to constrain mantle convection. The bulk of the data used in the tomographic imaging are millions of P, pP and pwP travel time residuals, read from high frequency seismic records. The distribution of earthquakes and stations results in …
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Geochemical and rheological constraints on the dynamics of the oceanic upper mantle
I provide constraints on mantle convection through observations of the rheology and composition of the oceanic upper mantle. Convection cannot be directly observed, yet is a fundamental part of the plate tectonic cycle. Relative motion among plates is accommodated by localized deformation at their …
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Geochemical and rheological constraints on the dynamics of the oceanic upper mantle
I provide constraints on mantle convection through observations of the rheology and composition of the oceanic upper mantle. Convection cannot be directly observed, yet is a fundamental part of the plate tectonic cycle. Relative motion among plates is accommodated by localized deformation at their …
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