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 31 for “"Tectonic settings"”.
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Paleo-environmental conditions and tectonic settings of cretaceous-tertiary kaolins in the Eastern Dahomey and Niger Delta Basins in Nigeria.
… respect to paleoenvironmental conditions and tectonic settings during the Cretaceous- Tertiary periods have been concentrated more on the use of flora and fauna as indicators with less application of kaolinite as paleoenviromental proxies, hence, this study. The research involved the …
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Analysis of Chemical Elements in Basalts using Mislabeled Data, a Machine Learning Approach
… basalt chemistry to discriminate among different tectonic settings. There are well-known chemical elements used to classify tectonic settings. An exploration of new features is done using Logistic Regression and Random Forest to discover any new elements of interest. The models were used with …
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An exploration of the effect of anisotropy on seismic tomography in different geological settings
… and seismic anisotropy in three distinct tectonic settings: 1) relic subduction zone in the westernmost Mediterranean, 2) isostatically-unbalanced the Moroccan Atlas Mountains in the intraplate of Africa, and 3) geologically active Central Appalachian Mountains in the passive margin of …
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Towards Enhanced Earthquake Resilience: Linking Early Warning Systems, Ground Motion Prediction, and Stress Field Analysis
… motion and event characteristics in complex tectonic settings. To address this, we examine how fault complexity affects ground motion predictions, emphasizing that realistic fault geometries and fault-zone properties can significantly influence seismic behavior. The study also analyzes the …
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Crustal structure beneath hi-climb seismic array in western Tibetan plateau from a generalized H-κ method
… ratio (κ) are essential for understanding the tectonic setting and other fundamental geological questions. However, the traditional H-κ method may provide some questionable results in regions where crustal structures are complex and uncertain, like crustal anisotropy and dipping crust. …
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Global investigation of large earthquakes using InSAR and long-period seismic data
… and for three real earthquakes in various tectonic settings (Mw 6.0 Eureka Valley, Mw 6.6 Aiquile and Mw 6.5 Zarand events). These tests clearly show the advantages of taking into account 3-D Earth structure in the modelling, and the combination of InSAR and seismic datasets reduces …
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Tectonic evolution of Pegasus Basin and the Hikurangi Trench, offshore New Zealand, The
The Pegasus Basin overlies part of the tectonic transition between oblique southwest subduction of the Pacific Plate below the East Coast of the North Island of New Zealand, and the strike-slip faulting that dominates the majority of the South Island of New Zealand. The transition from this …
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Structural Controls of the San Emidio Geothermal System, Northwestern Nevada
… deposits and geothermal systems in extensional tectonic settings.
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Lithospheric Structure Across the Northern Canadian Cordillera from Teleseismic Receiver Functions
… structure of the crust and can be related to the tectonic setting of a region. Teleseismic P-wave receiver function techniques can provide estimates of the depth of the Moho and therefore crustal thickness under a broadband station. In this research we are interested in the structure of the crust …
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Seismic Analysis of a United States Navy Structure Using Finite Element Modeling
… using finite element modeling. The geologic and tectonic settings of the site were investigated and the expected earthquake sources were determined. A probabilistic seismic hazard analysis was performed for the site, including a deaggregation of the earthquake sources affecting the site. The …
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Mantle and crustal controls on the distribution of chalcophile elements in silicate melts
… can vary substantially across different tectonic settings, the mechanisms which control the abundance and distribution of CSE in different magmatic environments are poorly constrained. In this thesis, I use the major, trace and volatile element systematics, together with in situ Fe3+/∑Fe …
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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
… most dynamically complex and seismically active tectonic settings on Earth. The dynamic evolution of this region is dominated by the African plate subduction along the Hellenic and Cyprus trenches and collision between the Anatolian and Eurasian plates. The region is characterized by active …
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Deformation mechanisms of naturally deformed rocksalt
… Tools used for the analysis involve simple microtectonic methods: transmitted and reflected light microscopy of gamma-irradiated thin sections and orientation measurements with EBSD. Case studies were chosen to represent different tectonic settings. Slightly deformed bedded Lower Triassic Röt …
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Why are there no low-δ18O magmas In convergent margins? A case of the Central Andes, Northern Chile
… 18O magmas (<5.7‰) are only found in extensional tectonic settings. Low-δ 18O magmas are rare, worldwide, especially in subduction zone settings. The main objective of this study was to conduct a search for low-δ 18O magmas in the Central Volcanic Zone (CVZ) of the Andes, to verify if their rarity …
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Volatile metal degassing from volcanoes: source processes, atmospheric transport and deposition
… volcanogenic trace element degassing in multiple tectonic settings (arcs, ocean islands, and continental rifts) and outgassing environments (magmatic vents and lava-seawater interactions), and extends to the compositional evolution of volcanic plumes in the atmosphere. Starting within the magmatic …
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INTO THE STRUCTURE OF THE PERMIAN DEEP CONTINENTAL CRUST: A MULTISCALE APPROACH TO RECONSTRUCT MIGMATIZATION IN THE VALPELLINE SERIES (DENT BLANCHE TECTONIC SYSTEM, WESTERN ITALIAN ALPS)
… and migmatite are widespread across different tectonic settings, such as those associated with collisional crustal thickening during orogenic events and post-collisional or back-arc lithospheric thinning. Studying these rocks provides an exceptional opportunity to observe the deep portions of …
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Tectono-hydrothermal evolution of the Neoarchean Abitibi greenstone belt, Canada
… are consistent with deposition in a variety of tectonic settings, although they are most consistent with sedimentation in continental rift or strike slip basins. The alluvial-fluvial conglomerates and sandstones of the Timiskaming assemblage contain abundant quartz clasts and igneous clasts …
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Geochemical controls on the fluid evolution of submarine and subaerial ore-forming hydrothermal systems
… to temperature and composition. The diversity of tectonic settings in which submarine hydrothermal systems are documented is then considered to investigate the possible role of crustal composition on the chemistry of hydrothermal fluids. Fluid-rock interaction simulations in peridotite-, basalt-, …
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Investigation of the upper mantle as a source for contribution to magnetic anomalies
… to compare magnetic properties across different tectonic settings. The metasomatized cratonic upper mantle of the United States interior contains ferromagnetic phases that exist at temperatures lower than the Curie temperature. This upper mantle would likely contribute to magnetic anomalies. …
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Improvement of aftershock models based on Coulomb stress changes and rate-and-state dependent friction
… I focus on two case studies from different tectonic settings: the Mw 9.0 Tohoku megathrust and the Mw 6.0 Parkfield strike slip earthquake. I study aleatoric uncertainties using a Monte Carlo method. I find that the existence of multiple receiver faults is the most important source of …
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