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 27 for “"Age Dating"”.
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Incorporating Recent Geochemical and Isotopic Constraints in Age Dating the Waters of Hot Springs National Park, Arkansas
<p>Mean water age for spring discharge in Hot Springs National Park was calculated as approximately 4,400 years by Bedinger et al (1978) using carbon-14. Their analysis indicated that the water was a mixture of a small portion of cold water that was less than twenty years old with a preponderance …
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Evaluation of Fracture Flow at the Coles Hill Uranium Deposit in Pittsylvania County, VA using Electrical Resistivity, Bore Hole Logging, Pumping Tests, and Age Dating Methods
… bore hole logging, a pumping test, and age dating and water chemistry. In this thesis groundwater flow is confirmed to occur from the Piedmont crystalline rocks across the Chatham Fault and into the Triassic basin at the study area as evidenced by pumping test data and static water-level …
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Luminous red galaxies in simulations
… measure the expansion rate of the Universe using age-dating of Luminous Red Galaxies (LRGs).Assuming stars in LRGs form at the same time, age-dating of two populations of LRGs at different redshifts can provide an estimate of the time difference associated with the corresponding redshift interval …
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Thermoluminescence in Carbonate Rocks and its Application to Stratigraphic correlation and Geologic Age Determination
… are in stratigraphic correlation and geologic age dating. Both short- and long-range correlations have been attempted. No figures pertaining to geologic age dating by this method have been published. </p><p>Results of investigations show that, while glow curve data may be of some value, many …
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Radioactivity of Fossil Fuel Waste Products and Associated Environmental Implications
… human and environmental health risks if not managed properly. In particular, elevated activities of NORM have been measured in coal combustion residuals (CCRs) generated from coal combustion and oil and gas wastewater (OGW) drawn from both conventional and unconventional oil and gas producing …
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The formation history of Olympus Mons from paleo-topography
… the weight of Olympus. Applying crater retention age dating to images from THEMIS VIS and THEMIS IR, we proposed the bulk formation of Olympus Mons occurred between 3.67 -010+005 Ga and 3.53-0.28+0 09 Ga.
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Temporal and petrogenetic constraints on volcanic accretionary processes at 9-10 degrees north East Pacific Rise
… side of the axial summit trough (AST). Eruption ages are critical for understanding the distribution and timing of volcanic and magmatic activity. Uranium series nuclides are susceptible to fractionation by magmatic processes that occur beneath mid-ocean ridges, and the half-lives of 226Ra (1.6 …
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Temporal and petrogenetic constraints on volcanic accretionary processes at 9-10 degrees North East Pacific Rise
… side of the axial summit trough (AST). Eruption ages are critical for understanding the distribution and timing of volcanic and magmatic activity. Uranium series nuclides are susceptible to fractionation by magmatic processes that occur beneath mid-ocean ridges, and the half-lives of 22 6Ra (1.6 …
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Deep-seated bedrock landsliding in Grand Canyon's Surprise Valley area
… strath terrace heights, and cosmogenic burial dating of river deposits buried by landslides. Mapping shows failures involving ~1000 m Paleozoic section localized within basal shale detachments, dammed and diverted the Colorado River and local tributaries, and forced the creation of epigenetic …
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U-Pb calcite dating of fossil eggshell and its impact on continental terrestrial sedimentology
… biostratigraphic and paleogeographic linkages tenuous at best. One of these key sites is that of Tel Ulaan Chaltsai, a fossil egg and nest bearing locality that has cryptically been placed both within the Early and the Late Cretaceous by different researchers. Therefore, Tel Ulaan Chaltsai …
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Star Formation History of the Milky Way Galaxy Disk Using a Hierarchical Model
… must be? It is vital to know the universe's age or that of our Galaxy – the Milky Way, to understand how the universe evolved to its current state. First, the Galactic population must be studied to understand the universe. A well-grounded way to understand the Galactic population is to learn …
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Development and Testing of a New Method for Velocity-Selecting White Dwarfs from Gaia by Galactic Population
… in formation theories and likely have distinct ages. Using the Milky Way as an example to probe this question, we are studying the formation history of these structures.</p> <p>This work details our approach to age-dating the galaxy, velocity-selecting targets from a sample of white dwarfs from …
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Aquifer Characterization in the Blue Ridge Physiographic Province
… the porous regolith as the primary water storage reservoir for the entire aquifer system. In this research, detailed hydrogeologic studies in the Blue Ridge Province in Floyd County, Virginia reveal a substantially different framework for groundwater flow. Recent acquisition of two-dimensional …
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Age, Stratigraphy and Depositional Environment of the Pliocene Copper Canyon Formation, Death Valley, California
… fauna/flora population to thrive. Radiometric age dating of</p> <p>three basalt flows within the CCF and magnetostratigraphic analysis of interbedded sedimentary rocks constrain deposition between 5 and 3 Ma. Further stratigraphic works limits the upper Copper Canyon Formation lacustrine …
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The Fraser Lakes Zone B U-Th-REE deposit and its host rocks : implications for pegmatite- and leucogranite-hosted U-Th-REE deposits in northern Saskatchewan, Canada
… material. Field relationships and chemical age dating of the pegmatites suggests that they formed between 1.85 to 1.80 Ga, during peak thermal metamorphism and ensuing decompression related to the ca. 1.9 to 1.8 Ga Trans-Hudson Orogen (THO). Examination of the pelitic gneiss host rocks at …
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Novel Insights into the Hydrogeochemical Evolution of Groundwater within the Transboundary Milk River Aquifer
… controlling groundwater flow, apparent average groundwater ages, chloride distribution, and groundwater quality evolution remain incompletely understood. Previous conceptual models have not fully reconciled the mismatch between regional hydraulic gradients, north-to-northwest trending …
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The geology, petrography, geochemistry and uranium ore mineralogy of the Namibplaas sheeted leucogranites, Damaran orogen, Namibia
… propect is typically a low grade high tonnage deposit with a resource in the measured category; 25 Mt at an average grade of 206 ppm U30s at a cut-off grade of 160 ppm. The project may not be economically viable under the current global uranium price; however, the project may become viable …
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Application of Polychlorinated Biphenyl Signatures for Environmental Fingerprinting
… to determine the source of PCB contamination and age date exposure in workers at a transformer dismantling plant. A total of 84 different PCB congeners were identified in the sera of 30 workers with concentrations of the 7 indicator PCBs ranging from 1.2 - 39 μg g-1 lipid. Analysis of PCB …
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Landscape evolution and preservation of ice over one million years old quantified with cosmogenic nuclides 26Al, 10Be, and 21Ne, Ong Valley, Antarctica
… (CTM) and the preservation of Pleistocene aged ice underneath an insulating lag deposit. </p><p> Ong Valley in the Central Transantarctic Mountains (CTM) contains ancient buried glacier ice derived from past flow of the adjacent Argosy Glacier. The valley floor is covered with patterned …
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Moving hotspots
… upwelling mantle. In turn, the azimuths and age progressions of seamount trails can be used to quantify plate motions with respect to an independent reference frame of hotspots in the mantle. Also, assuming fixed hotspots, the direction of characteristic remanent magnetization in the basalts …
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