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 53 for “"Geodynamics"”.
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Some more problems of geodynamics
This dissertation presents new theoretical methods that could contribute to constraining the deep Earth’s long-wavelength density structure. In Chapter 2 we present a numerically exact method for calculating the internal and external gravitational potential of aspherical and heterogeneous planets. …
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The geochemistry, kinematics and geodynamics of the Gannakouriep dyke swarm
The Gannakouriep dyke swarm comprises a linear swarm of north to northeast striking mafic dykes emplaced during late Proterozoic rifting in the Gariep belt. The swarm has a strike length of over 300 km crossing terrane boundaries of the Gordonia sub-province, Richtersveld igneous sub-province and 8 …
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Neogene paleomagnetism and geodynamics of the Hikurangi margin, East Coast, New Zealand
Vertical-axis rotations are an important component of Neogene deformation in the New Zealand plate boundary region, and potentially offer fundamental insights into the rheology of continental crust. Extensive paleomagnetic sampling along the Hikurangi margin, on the East Coast of the North Island, …
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Surface uplift, fluvial incision, and geodynamics of plateau evolution, from the western margin of the Central Andean plateau
The Colca-Majes and Cotahuasi-Ocona rivers in southwest Peru that cut through the western margin of the Andean plateau en route to the Pacific Ocean incised canyons over 3 km deep in response to late Cenozoic surface uplift. This latest uplift represents a fundamental shift in the style and …
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INTEGRATION OF NATURAL DATA WITHIN NUMERICAL MODEL TO THE GEODYNAMICS RECONSTRUCTION OF AN INNER PART OF THE ALPINE BELT.
… analysis some original results regarding general geodynamics observation are obtained. Model predictions pointed out that a direct relationship exists between mantle rheology and the amount of recycled crustal material: the larger the viscosity contrast between hydrated and dry mantle, the larger …
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The structural geology of the Naukluft Nappe Complex and its relationship to the Damara Orogenic Belt, South West Africa/Namibia
… evidence bearing on the timing and large-scale geodynamics of the Late Precambrian-Early Palaeozoic Damara orogeny, particularly the hypothesis that it involved plate tectonic processes of subduction and continental collision in the southern zones.
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Tectonic and magmatic processes during extension in planetary lithospheres : rifting, spreading, delamination, and recycling on Earth and Venus
… formation and link their formation to global geodynamics, highlighting that Venus’ regional tectonics is highly sensitive to thermal conditions in the lithosphere and mantle. All of this shows the importance of understanding regional tectonics and local lithosphere dynamics, since they can …
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Inferring the thermomechanical state of the lithosphere using geophysical and geochemical observables
… lithology is important for lower crustal geodynamics. In Chapter 2, I utilize thermobarometry, diffusion models, and thermodynamic modelling to constrain the ultra-high formation conditions and cooling rates of the Gore Mountain Garnet Amphibolite in order to understand the rheology of the …
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Inferring the Thermomechanical State of the Lithosphere Using Geophysical and Geochemical Observables
… lithology is important for lower crustal geodynamics. In Chapter 2, I utilize thermobarometry, diffusion models, and thermodynamic modelling to constrain the ultra-high formation conditions and cooling rates of the Gore Mountain Garnet Amphibolite in order to understand the rheology of the …
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Análise do risco à erosão do solo no município de Lucena - Paraíba.
… loss in Brazil are derived from factors external geodynamics of the Earth, such as floods and floods, landslides of soil and / or rocks and storms. Several municipalities in Paraíba suffer the intense action of erosion. The municipality of Lucena, located in the Paraíba coast, not unlike this …
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Studying 3D Spherical Shell Convection using ASPECT
… more modern and advanced solver methods than geodynamics legacy codes. I use ASPECT to calculate 2-dimensional Cartesian as well as 2- and 3-dimensional spherical-shell convection cases. All cases use the Boussinesq approximation. The 2D cases come from Blankenbach et al. (1989), van Keken et …
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Cosa si potrebbe fare per monitorare e comprendere meglio l'evoluzione delle faglie dell'Etna?Monitoraggio e analisi della deformazione superficiale tramite tecniche geodetiche e topografiche comparate. Caso studio del versante orientale del vulcano Etna.
… strutture. Dal 2014 Il gruppo di ricerca del GEODynamics & GEOMatic Laboratory dell’Università degli Studi di Catania, nell’ambito di un progetto multidisciplinare orientato allo studio e comportamento di strutture geologiche attive, ha individuato dei laboratori naturali a cielo aperto, dove …
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Revealing interior structure of planetary bodies from their tidal response
… density structure, which is key for fields like geodynamics and geodesy, as it drives mantle convection and shapes the geoid. Consequently, additional methods are required to constrain the density structure. Tidal phenomena are ubiquitous in the universe. On Earth, tidal forces lead to periodic …
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Receiver function imaging of mantle transition zone discontinuities beneath Alaska
… processes, yet many aspects of subduction zone geodynamics remain unsolved and poorly understood, such as the depth extent of the subducted slab and its geometry. The Alaska subduction zone, which is associated with the subduction of the Pacific Plate beneath the North America plate, has a …
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Analysis and interpretation of clustered microseismicity at geothermal and petroleum reservoirs
… this cluster was attributed to the natural geodynamics of this complex area. Analysis of a set of events from the LAGO seismogenic zone in the Larderello Geothermal field again showed a spatial association with the seismic "1(11 horizon and a lateral NW-SE linear distribution that correlated …
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Mantle Heterogeneity Through Mid-Ocean Ridge Basalts
… history, thereby illuminating chemical geodynamics in Earth's mantle.
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Tectonic-Climate Interactions And Glacial History Within The Chugach And Kenai Mountains, Alaska
… the erosion of orogens, sedimentation rates, and geodynamics of the crust. Glaciers are the most effective climate driven erosive processes, where the frequency of glacial periods has a direct impact on the structure of mountain ranges through time. The late Cenozoic global cooling period was the …
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A model of the crust and upper mantle structure of the Hellenic and Cyprus subduction zones constrained by gravity and seismic data
… Recovery and Climate Experiment) LAGEOS (Laser Geodynamics Satellites), and GOCE (Gravity field and steady-state Ocean Circulation Explorer) missions. The results of the gravity modeling, as constrained by geophysical data and models such as receiver function and seismic tomography, show that …
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Polluted White Dwarfs: Insights into Ancient Extrasolar Planetary Systems
… determine a rocky world’s bulk composition, geodynamics, and subsequent climate is of vital importance to this pursuit. In this thesis, I demonstrate how the pollution of white dwarf stars by rocky exoplanetary material offers an insight into the bulk composition of rocky exo-planets, and …
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