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 16 of 16 for “"Mineral Physics"”.
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Single-crystal X-ray diffraction at extreme conditions in mineral physics and material sciences
Single crystal X-ray diffraction (XRD) is a powerful non-destructive method which allows unambiguously identify crystalline phases, determine a crystal structure (unit cell parameters, a space group, atomic coordinates and atomic occupancies) and, if required, a phase composition. This thesis deals …
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Seismic imaging of the mantle transition zone
… tomography models. Through integration with mineral physics data, the GRT seismic sections can put important constraints on the mantle temperature and mineralogy of the transition zone. Our GRT imaging results beneath the Central Pacific (including the Hawaii hotspot) reveal a more …
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Probing the Mantle Transition Zone beneath the Central Pacific Region Using PP Precursors
… along with pressure-temperature data from mineral physics suggest an average mantle temperature of 1,200-1,250 ºC with no differentiation among compositional types. A more promising method is used by measuring and comparing the peak amplitude ratios of precursors to the main PP between the …
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Studying subduction zone dynamics and continental evolution in South America using data-oriented geodynamic models
… seismic anisotropy, topography and gravity, mineral physics, as well as geological data such as mountain shortening and paleo-altimetry. The synergy among all these disciplines not only increases the spatial and temporal coverage of the research topics, but also narrows down the intrinsic …
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Documenting the Origin of Compositional Diversity of Subduction Zone Magmatism, Alicudi, Aeolian Arc (Southern Tyrrhenian Sea, Italy) Using in situ Plagioclase Data
<p>Processes that generate magma compositional diversity are important to document because composition affects degree of explosivity, which impacts hazard mitigation. Magnesium to silicon rich magmas are produced by processes such as magma recharge, assimilation, and fractional crystallization …
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Documenting Magma Evolution of the Fossa delle Felci (Salina Island, South Tyrrhenian Sea) by Integrating In Situ Plagioclase Data with Quantitative Modeling
<p>Compositional diversity occurs via processes dominated by recharge, assimilation and fractional crystallization (RAFC), quantification of which can provide insights into eruption catalysts, and therefore assist in hazard mitigation. This study evaluates the relative roles of RAFC processes in …
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Giant Plagioclase in the Steens Basalt, SE Oregon: Cumulate Entrainment Revealed by Textural and In Situ Chemical Analysis
Many of the lava flows comprising the Steens Basalt in SE Oregon, the oldest and most mafic formation of the Columbia River Basalt Group (CRBG), contain exceptionally large (up to 5 cm) and abundant (up to 40 modal %) plagioclase crystals. This thesis presents a model for giant plagioclase …
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Documenting Magnatic Processes at Filicudi Island, Aeolian Arc, Italy: Integrating Quantitative Modeling and Plagioclase Textural and in situ Compositional Data
<p>Documenting the physiochemical processes that influence magma composition is critical for forecasting eruption styles and managing volcanic hazards. Compositional diversity of magmas develops through recharge, assimilation, and fractional crystallization (RAFC) within subvolcanic magma …
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Framework Grain Composition and Texture of the Wedington Sandstone Member, Fayetteville Shale, as a Provenance and Sediment Dispersal Indicator for Clastic Depositional Systems Across the Northern Arkansas Structural Platform During the Late Mississippian
<p>The Wedington Sandstone Member of the Fayetteville Shale is a constructive delta complex in the Chesterian section of the Late Mississippian record in Northwest Arkansas. A comparative analysis of framework grain composition between the Wedington and two other stratigraphically proximal …
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Comparative Geochemical Analysis of Ordovician and Mississippian Cherts in Relation to the Northern Arkansas and the Tri-State Mississippi Valley-type Ore Districts
<p>It has been hypothesized that Ordovician, Mississippian, and younger carbonate and clastic formations found within the Ouachita Basin of west-central Arkansas and northward onto the Ozark Dome have experienced interaction with hydrothermal fluids due to tectonic forces produced by the Ouachita …
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Elastic properties of mantle minerals by multiple methods and at high pressures and temperatures
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2025-08-01
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Fluid Budget of Metasedimentary Rocks from a Tertiary Accretionary Prism and Connections to Seismicity, Olympic Peninsula, Northwest Washington State
<p>Metamorphic dehydration reactions and fluid movement in accretionary prisms have been linked to the recently discovered episodic tremor and slip (ETS) earthquake events along subduction zones, but prior studies lack the detail to effectively test the hypothesis that fluid flow triggers ETS …
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Elasticity of single-crystal iron-bearing pyrope to 20 GPa and 750 K
Elastic properties of the major constituent minerals in the Earth’s upper mantle at relevant high pressure-temperature (P-T) conditions are crucial for understanding the composition and seismic velocity structures of the region. In this study, we have measured the single-crystal elasticity of …
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Infrared Spectra Analysis of Thermally Altered Iron Phyllosilicates and the Implications for Mars
… which may be present on Mars. The minerals, greenalite and hisingerite, are rich in iron-II and iron-III, respectively. Small samples (~0.40 grams) of each mineral were crushed and heated in a Lindberg Tube Oven for approximately twenty-four hours at temperatures selected to mimic …
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Using Conservative and Biological Tracers to Better Understand the Transport of Agricultural Contaminants from Soil Water through the Epikarstic Zone
Agriculture contamination is very common in karst systems due to the vulnerability of these aquifers. Animal waste is often spread across crop land to enrich the soil with nitrates and phosphates. Herbicides and pesticides are also applied to the crops. The transport of these pollutants through the …
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The Role of the State, Multinational Oil Companies, International Law & the International Community: Intersection of Human Rights & Environmental Degradation Climate change in the 21st Century caused by Traditional Extractive Practices, The Amazon Rainforest, Indigenous People and Universal Jurisdiction to Resolve the Accountability Issue
<p>Local, national and international conventions that protect indigenous sovereignty and their territories, where many of the resources are extracted from by multinational corporations (MNCs) particularly oil, the number one commodity of the world and cause of climate change, continue to be …