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 24 for “"Deep Earth"”.
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Deep Earth volatile cycles as revealed by basalt chemistry
Earth’s volatiles (e.g. CO$_2$ and H$_2$O) are thought to be stored largely in the interior of the planet. The partitioning of these volatile elements between Earth’s surface and interior controls the evolution of our atmosphere and oceans, acting as a regulator on our planet’s long term climate. …
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Dismantling the deep earth : geochemical constraints from hotspot lavas for the origin and lengthscales of mantle heterogeneity
Chapter 1 presents the first published measurements of Sr-isotope variability in olivine-hosted melt inclusions. Melt inclusions in just two Samoan basalt hand samples exhibit most of the total Sr-isotope variability observed in Samoan lavas. Chapter 3 deals with the largest possible scales of …
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Dismantling the deep earth : geochemical constraints from hotspot lavas for the origin and lengthscales of mantle heterogeneity
Chapter 1 presents the first published measurements of Sr-isotope variability in olivine-hosted melt inclusions. Melt inclusions in just two Samoan basalt hand samples exhibit most of the total Sr-isotope variability observed in Samoan lavas. Chapter 3 deals with the largest possible scales of …
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The Evolution of the Galapagos Mantle Plume: From Large Igneous Province to Ocean Island Basalt
… melts indicate that these structures sample deep Earth geochemical and lithological heterogeneities. Studying plume-derived lavas can clarify important planetary-scale questions relating to the accretion of the Earth, primordial geochemical reservoirs, the fate of subducted materials, …
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Reservoir characterization of the Deadwood formation western North Dakota, Williston Basin
… the Williston Basin in southern Saskatchewan by DEEP Earth Energy Production Corporation and various other researchers. This study focuses on determining the geographic extent of geothermal energy prospectivity in western North Dakota. This project combines traditional hydrocarbon reservoir …
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Experimental constraints on the rheological behavior of olivine at upper mantle conditions
… the dynamic system driving the evolution of the earth, both at the surface and in the deep interior. While the deep earth contains far fewer phases than the crust, the inaccessibility of the mantle and core present a different challenge: unraveling the physical behavior of materials at conditions …
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The Effect of Minor Elements on the Physical and Chemical Properties of Lower Mantle Minerals at High-Pressure
… elasticity, and crystal chemistry of minerals in Earth's lower mantle are of general importance for the interpretation of seismic wave observations, geochemical modeling, and geodynamic simulations. Aluminum-bearing (Mg,Fe)SiO3 perovskite and (Mg,Fe)O ferropericlase are proposed to be the most …
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Numerical Analysis of Thermal Behavior and Fluid Flow in Geothermal Energy Piles
… combines ground source heat pump technology with deep earth structural foundations of buildings. GEPs are relatively new technology and robust standards and guidelines have not yet been developed for the design of these systems. The main operational difference between GEPs and conventional BHEs is …
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Geochemical fractionation during melting of sulfide and sulfate bearing mantle lithologies
Earth’s surficial biogeochemical sulfur (S) cycle is connected to the deep sulfur cycle at convergent margins, where, crust and oceanic lithospheric mantle subducts beneath an overriding plate and transporting sulfur and other materials from the surface to the deep Earth. A part of the subducted …
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Elasticity across the post-stishovite transition in subducted basalt
… hydrated mid-ocean ridge basalt (MORB) into deep Earth, which is chemically and physically distinct from the surrounding mantle. Physical properties of MORB materials are thus important to understand observed seismic Vₛ anomalies. In this dissertation, physical properties of stishovite and …
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The origin and behaviour of carbonate minerals in diverse environments: from subduction zones to asteroids
… three distinct environments: subduction zones in Earth’s mantle, a clay- rich near-surface terrestrial environment, and the CM parent asteroid(s). Subduction zones play an important role in the deep carbon cycle that includes the transport of carbon-bearing phases in subducting slabs to deep …
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Structure-property relationships of earth and engineered materials
… of the physical world, from unraveling deep-earth dynamics to developing and tuning profitable materials. A comprehensive characterization of the structure of minerals and materials (from their atomic- to microstructure) is necessary for their full and informed implementation. This …
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Imaging subduction zones: slab structure, fluids, and fault slip
… production of arc magmas, and controlling the deep Earth water cycle. The magnitude of hydration depends heavily on the tectonic structure of the incoming plate, which can vary significantly over short along-strike distances, with regions of increased faulting and internal deformation enhancing …
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Modeling of mineral-melt interfaces
… is an important geological process in the deep Earth that affects physical, chemical and rheological properties of rocks. The effect of partial melting on mantle dynamics depends on both the amount of melt and how it is distributed within the crystalline matrix. A few percent of melt have …
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New high pressure phase transition of natural orthoenstatite and sound velocity measurements at simultaneous high pressures and temperatures by laser heating
… composition and physical processes of Earth’s interior. Phase transitions in candidate deep earth minerals under high-pressure high-temperature conditions is one of the main causes of the seismically observed discontinuities that define the boundaries between major layers of the Earth. …
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Application of passive seismic interferometry for local and shallow imaging
… (e.g., microseisms) for global scale imaging of deep earth structures. Application of these methods at shallow scales is challenged by the scarcity of high-frequency ambient noise sources in local settings. Areas away from anthropological activity have very weak noise sources of sufficiently high …
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Towards using seismic anisotropy to interpret ductile deformation in mafic lower crust
… and coupling of kinematics between surface and deep-Earth processes. An understanding of the relationship between seismic properties, finite strain and fabric orientation thus provides a useful tool in the remote sensing and interpretation of deformation in the lower crust. This thesis outlines …
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Genetic decoding dynamics: from its exploitation to enhance or rescue gene expression to a search for relevance for early evolution
… for radical new life has been undertaken here on Earth. The likely theory of the RNA World postulates that an RNA-organism predated the emergence of DNA and protein catalysts. We undertook a multidisciplinary search of deep earth cores and pockets of ancient water that have been isolated from …
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Receiver function imaging of deep and shallow subsurface structures of Oklahoma
… of humanity about the geological history of the Earth and its prospective evolution. While active seismic imaging is dominantly applied in the exploration industry, passive seismic imaging methods which extract the subsurface information from natural sources (e.g., earthquakes, ambient noise, …
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First principles phase diagram calculations in group IV carbides and Mg2SiO4 liquid from Molecular Dynamics
… on stability and physical properties of Earth materials are playing an increasingly important role in high pressure mineralogy. Such computations can provide guidance for experimental studies and insight into underlying causes of observations, or explore conditions and properties that are …
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