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 35 for “"Dynamic Topography"”.
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Continental Magmatism and Dynamic Topography
Isostasy, flexure and dynamic processes all influence the shape of the Earth’s surface. While the first two processes are well understood, dynamic topography remains controversial. On the continents, dynamic uplift is often expressed by positive long-wavelength gravity anomalies, radial drainage …
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Dynamic Topography of Madagascar and its Surroundings
Some portion of long-wavelength topography and bathymetry in the southwestern Indian Ocean is supported by convective processes within the Earth's mantle. Predictive models suggest that both southern Africa and the southwestern Indian Ocean are anomalously elevated by 0.5--1.5~km. In contrast, …
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Global Relationships Between Intraplate Magmatism and Dynamic Topography
… residual depth anomalies allow present-day dynamic topography to be estimated. However, the mantle convective planform evolves through time. Direct evidence of positive dynamic topography is dicult to obtain from the stratigraphic record since elevated topography is rapidly denuded. …
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Dynamic Topography of the Borborema Province, South America
… ∼ +30 mGal, which is consistent with sub-crustal dynamic support. This inference is corroborated by the presence of positive residual depth anomalies of 100s of meters which are observed along the abutting continental margin. Onshore, regional uplift is manifest by Albian marine limestones, which …
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Global Analysis of Predicted and Observed Dynamic Topography
While the bulk of topography on Earth is generated and maintained by variations in the thickness and density of crust and lithosphere, a significant time-variable contribution is expected as a result of convective flow in the underlying mantle. For over three decades, this dynamic topography has …
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Observations of Dynamic Topography from South American Atlantic Margin
Topography of the Earth is mainly controlled by its crustal and lithospheric architecture. Variations in thickness and density of the crust and of the lithospheric mantle create the most noticeable topography. However, it is also widely recognized that mantle convective processes dynamically …
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Basalt Magmatism as a Key to Unlocking Cenozoic Dynamic Topography
Reconstructing mantle dynamic topography through space and time remains a significant challenge. Nevertheless, useful insights can be gained by analysing Cenozoic basalt magmatism, which correlate with convectively driven regional uplift across the globe. This dissertation comprises three regional …
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The Significance of Densely Sampled Observations of Mantle Dynamic Topography
Dynamic topography is generated from mantle convection and can be isolated from isostatic topography using observational constraints. Quantifying observable dynamic topography yields valuable information on mantle convective processes. This study presents a revised and augmented dataset of 10,874 …
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Influence of static and dynamic topography on osteoblast proliferation and maturation
… which can be compressed to remove all surface topography and at 37˚C shows nearly complete recovery within 8 hours. The examination of pre-osteoblast MG63 cell behavior on these SMPs (with and without compression) by DNA and ELISAs indicates MG63 cells can be 'clued' to proliferate and then to …
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Effects Of Subduction History On Mantle Convection: Implications For True Polar Wander And Dynamic Topography
… maturation and location of fossil fuels, and the dynamics of Earth’s deep interior. However, the uncertainty of plate tectonic reconstructions increases rapidly backwards in time. In particular, the circum-Pacific region reaches nearly 60% uncertainty by the Mesozoic (~150 Ma). The primary source …
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Dynamic topography of the western Great Plains : geomorphic and 40Ar/39Ar evidence for mantle-driven uplift associated with the Jemez lineament, New Mexico and SE Colorado
… Several datasets indicate patterns of surface topography that are consistent with dynamic rock uplift along a NE-trending flexural bulge above the Jemez low-velocity mantle anomaly, but are not well-explained by climate. They include: (1) crude volcanic "belts" of similar age, (2) retreating …
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Geodetic and Geodynamic Constraints on Vertical Land Motions in the Chesapeake Bay
… of subsidence throughout the Chesapeake Bay are dynamic topography and glacial isostatic adjustment. We perform geodynamic modeling to assess the influence of both processes on the region. We estimate present-day rates of dynamic topography using ASPECT (Advanced Solver for Planetary Evolution, …
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Epeirogeny of South America and Evolution of Parnaíba Basin, Northeast Brazil
… some proportion of South American large-scale topography has been generated by convection within the Earth's mantle. Yet, spatial and temporal patterns of dynamic topography remain poorly understood. Variation of present-day dynamic topography can be mapped in the oceans by calculating residual …
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Inside-out diversity of rocky planets
… The first consequence of variability I model is topography. Topography sets the size of the largest ocean that planets could contain below their highest point—the capacity of the continental bathtub. I calculate the bare-minimum, dynamic topography due directly to mantle convection, by finding …
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Understanding topographic evolution of continents with landscape evolution simulations: the case of North America
Earth’s topography is constantly evolving due to tectonics, surface processes, and climatic forcing. Since Mid-Cretaceous, the North American continent has experienced dramatic topographic fluctuations, from the Cretaceous Western Interior Seaway (WIS) to the present high elevations within the …
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Generation of Buried Transient Landscapes and Residual Depth Anomalies
… along the west coast of Africa reveal that dynamic topography varies spatially on shorter wavelengths than previously described. These observations are consistent with earthquake tomographic models and geochemical analysis of basaltic rocks.
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Characterization of the East China Sea Continental Shelf Circulation Northeast of Taiwan surrounding Mien-Hua Canyon
… on continental shelf circulation and flow dynamics, especially in relation to western boundary currents. There are two key circulation features northeast of Taiwan on the East China Sea continental shelf: (1) the cold dome, a cyclonic feature that appears primarily in summer and is …
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Determining the upper mantle seismic structure beneath the northern transantarctic mountains, Antarctica, form regional p- and s-wave tomography
… associated with Cenozoic extension along the TR. Dynamic topography estimates based on the imaged S-wave velocity perturbations are consistent with observed surface topography in the central and northern TAMs, thereby providing support for uplift models that advocate for thermal loading and a …
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Continental Deformation: Collisional Orogenesis to Passive Margin Processes
… to evaluate numerical models of North American dynamic topography. GPS shows southern Tibet creeps south at the same rate river terraces are deformed at the range front. The India-Asia intracontinental subduction zone, the Main Himalayan Thrust (MHT) is a lithospheric fault whose style of motion …
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New Constraints For Convergent Margin Plate Tectonic Reconstructions From Imaged And Predicted Mantle Structure
… using seismic tomography and forward geodynamic models, respectively. We apply recently-developed P-wave tomographic filtering to create ‘synthetic tomography’ of the geodynamic models. East Asia is one the most uncertain areas in global plate tectonics. We therefore focus on the East …
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