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.
Results
Showing 1 to 20 of 20 for “"Mantle Dynamics"”.
-
Expressions of Mantle Dynamics in Landscapes and Sedimentary Basins
… conclude that quantitative information about the dynamics of the Earth's mantle can be obtained by careful analysis of landscapes and the stratigraphic record.
-
Mantle plume-midocean ridge interaction : geophysical observations and mantle dynamics
… plume-ridge systems to constrain crustal and mantle density structure at these prominent oceanic features. Numerical models are then used to explore the physical mechanisms controlling plume-ridge interaction and to place theoretical constraints on the temperature anomalies, dimensions, and …
-
Mantle plume-midocean ridge interaction : geophysical observations and mantle dynamics
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1996.
-
Understanding lithospheric and mantle dynamics using geodynamic models with data-assimilation
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-12-04 without embargo terms
-
Seismic anisotropy and mantle dynamics beneath the central and western United States
<p>"Various tectonic features and the recent availability of high-quality broadband seismic data from the USArray and other seismic stations in the central and western United States (CWUS) provide a distinct opportunity to test different anisotropy-forming mechanisms. For the first part of the …
-
Localization of gravity and topography : constraints on the tectonics and mantle dynamics of Earth and Venus
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Earth, Atmospheric, and Planetary Sciences, 1996.
-
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 …
-
Imaging the D" Structure using Waveform Modelling
… lowermost few hundred kilometres of the lower mantle, is designated as a thermal boundary layer and chemically distinct layer above the core-mantle boundary (CMB). It plays an important role in mantle convection, core convection and the resulting geodynamics. Characterising the structure of …
-
Imaging the D" Structure using Waveform Modelling
… lowermost few hundred kilometres of the lower mantle, is designated as a thermal boundary layer and chemically distinct layer above the core-mantle boundary (CMB). It plays an important role in mantle convection, core convection and the resulting geodynamics. Characterising the structure of …
-
Unveiling the lithospheric and mantle dynamic controls on Antarctic topography
… influenced by spatially and temporally variable mantle dynamics. This study uses an interdisciplinary approach to probe the present-day crust and mantle beneath Antarctica. First, observed bathymetry and topography in the oceanic and continental realms are corrected for isostatic effects to …
-
An exploration of the effect of anisotropy on seismic tomography in different geological settings
… anisotropy. Despite it is well known that the mantle is seismically anisotropic, the isotropic mantle is often assumed in seismic tomography. In this dissertation, we explore the upper mantle velocity structure and seismic anisotropy in three distinct tectonic settings: 1) relic subduction zone …
-
Magma genesis in the northern Lau Basin, S.W. Pacific
… controls result from processes related to the mantle dynamics in the northern Lau Basin, and to along-trench variations and the degree of influence of the subduction component. The lavas associated with the Central Lau Spreading Centre are derived from the Lau Basin mantle reservoir, which has …
-
QUASI STATIC GRAVITY SIGNATURES IN SLOW TECTONIC ZONES: ASSIMILATION OF NOVEL AEROSPACE DATA AND GEOPHYSICAL MODELING
… numerical models are used to simulate the crust-mantle dynamics; in particular, complexities such as compositional stratification of crust-lithosphere system, mantle hydration, phase changes and degree of plate coupling are investigated, exploring how they affect the gravity field and its rate of …
-
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 …
-
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 …
-
Dynamics of the North American Plate: Numerical Development, Mantle Flow Modeling, and Receiver Function Analysis
… of numerical models needed to investigate the dynamics 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 …
-
Mapping the Core-Mantle Boundary Using Sdiff Postcursors
The core-mantle boundary – the interface between the rocky mantle and the fluid iron outer core – is host to a diverse collection of phenomena across all length scales. At the largest length scales, continent-sized structures characterised by low velocity anomalies lie opposite to each other on the …
-
Studying subduction zone dynamics and continental evolution in South America using data-oriented geodynamic models
… potentially linked to the underlying restless mantle convection that has persisted for billions of years. The purpose of my dissertation is to understand the causes and consequences of the major geological events in South America and evaluate the potential role of mantle convection in driving …
-
Silicon and oxygen self-diffusion in forsterite and implications to upper-mantle rheology
… be reconsidered. The viscosity in the upper mantle calculated from DSi continuously decreases with increasing depth without appearing a minimum zone by mineral hydration, and therefore, the asthenosphere softening cannot be caused by water effect. The CH2O differences between the source of …
-
A heavy stable isotope approach to tracing mantle source and process
The geochemistry of global mantle melts suggests that both mid-ocean ridge basalts (MORB) and ocean island basalts (OIB) sample lithological heterogeneities originating in both the upper and lower mantle, with recycled crustal material accounting for a significant part of this variability. …