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 34 for “"geochemical modeling"”.
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Geochemical modeling of an aquifer storage and recovery project in Union County, Arkansas
… of ASR systems is to assess the potential geochemical reactions between the injected water and the local aquifer water, which are typically of very distinctive compositions and environmental conditions. The goal of this paper is to use the geochemical modeling software PHREEQC to simulate …
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Geochemical modeling of diagenesis, hydrothermal alteration, and unconformity-related uranium mineralization in the Athabasca Basin, Saskatchewan, Canada
… deposition mechanisms of ores. This study uses geochemical modeling to: 1) determine fluid flow patterns responsible for U leaching and transport in the Athabasca basin; 2) recognize critical factors controlling ore deposition near the unconformity intersected by basement faults; and 3) …
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Geochemical modeling-based prediction of water-rock interaction during aquifer storage and recovery utilizing selected Colorado Front Range aquifers
… major, minor and trace elements from bulk rock geochemical analysis and mineral identification from petrography are used to infer a generalized mineral suite to represent each of the formations of interest. Similarly, compositional analyses from domestic water well samples, including major …
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Geochemistry of Arsenic, Manganese, and Iron in the Dexter Pit Lake, Tuscarora, Nevada
… served to outline local hydrogeology and aqueous geochemical behavior of numerous conservative elements in pit lake waters. The previous studies additionally identified arsenic (As), manganese (Mn), and iron (Fe) as elements that displayed non-conservative behavior in the pit lake. The purpose of …
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Modeling Groundwater Denitrification by Ferrous Iron Using PHREEQC
… studies mainly because of two reasons: 1) the geochemical evidence for ferrous iron is more difficult to decipher due to the precipitation of Fe(III)-oxyhydroxides from the aqueous solution. 2) in the event when denitrification by both Fe(II) and organic carbon gave rise to precipitating …
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The impact of nonpoint source pollution from mining wastes on water quality, Elko County, Nevada
… River as it flows through the mine site. Geochemical modeling and historical data suggested that waste rock from the mine is primarily responsible for the increase in dissolved solids concentration. Electrical conductivity of the water exhibits seasonal fluctuations, with high values …
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Hydrogeology and hydrogeochemistry of the Spring Mountains, Clark County, Nevada
… in the central portion of the mountain block. Modeling of {dollar}\delta\sp{13}{dollar}C in ground water suggest low P{dollar}\sb{\rm CO\sb2}{dollar} and enriched {dollar}\delta\sp{13}{dollar}C in soil, and open system conditions at high elevations. Analysis of {dollar}\sp{14}{dollar}C in …
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Hydrogeological controls of uranium and arsenic mobility in groundwater of the Pine Ridge Reservation, South Dakota
This study integrates geochemical modeling, spatial analysis and several statistical methods including principal component analysis, multivariate regression and cluster analysis to investigate hydrogeologic controls of arsenic and uranium contamination within groundwater of the Arikaree aquifer on …
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Experimental determination of the volumetric properties for the system CO₂-CH₄-N₂ at 100-1000 bars and 50-300°C
… species and their mixtures find application in geochemical modeling of crustal fluids in a wide variety of geologic environments. However, volumetric data for gaseous mixtures are scarce, particularly at high pressures and temperatures. In this study, the volumetric properties of binary and …
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Implications of geological carbon sequestration on shallow freshwater aquifers geochemistry
… The experimental work was supplemented with geochemical modeling, both equilibrium and kinetic (predictive).
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Experimental Constraints on Melting Processes in the Earth and Small Rocky Bodies
… that integrates high-pressure experiments, geochemical analysis, and petrologic modeling. In Chapter 1, I examine the mantle source lithology of Hawaiian pre-shield tholeiitic volcanism through high-pressure equilibrium experiments and geochemical modeling. In Chapter 2, I define the …
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A Quantitative Analysis of Interstitial Fluid-Chemistry and Limestone Dissolution Rates Within the Clastic Sediment of a Karst Aquifer Conduit, Mammoth Cave, Kentucky
… loss experiments, along with water sampling and geochemical modeling, has been undertaken to understand the nature of fluid movement and chemistry with the sediment beneath an active flowing cave stream within the Kentucky's Mammoth Cave System. Fluid flow and carbonate chemistry were compared …
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Modeling & Optimization of CO2-Mixture Frost Growth as a Carbon Capture Process & Integration with Sequestration
… in-house model, performed by coupling PHREEQC geochemical modeling with flow and continuity equations, examines the behavior of the injected brine in deep saline aquifers. The model quantifies permeability changes driven by geochemical reactions and fines migration. By linking cryogenic CO2 …
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Controls on arsenic mobility in contaminated wetland and riverbed streams
… As associations were compared to XANES analyses. Geochemical modeling was used to predict redox conditions and As associations. We found that most As in the wetland was adsorbed onto amorphous Fe (hydr)oxide phases. Riverbed sediments differed from wetland sediments in that redox conditions were …
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Impacts of Rock-Brine Interactions on Petrophysical Properties of a Sandstone Reservoir, Utilizing Geochemical and Pore Network Modeling
Unfavorable consequences of geochemical reactions, such as calcite and silica scaling, in geothermal power plant surface facilities have been discussed in many recent studies. However, the impact of brine-rock interactions related to geothermal projects on reservoir properties has not been …
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The dynamics of oceanic transform faults : constraints from geophysical, geochemical, and geodynamical modeling
… geophysical data analysis and geodynamical and geochemical modeling. Chapter 1 examines the effect of fault segmentation on the maximum predicted earthquake magnitude of an oceanic transform fault system. Results of thermal modeling suggest that fault segmentation by intra-transform spreading …
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SYNTHESIS, CHARACTERIZATION, AND THERMAL INVESTIGATION OF METAL PHOSPHITES AND POTENTIAL IMPLICATIONS FOR ASTROBIOLOGY
… is scarce and could be a result of oxidative geochemical processes. We present the synthesis, characterization, and thermal investigation of four metal phosphites with prebiotically plausible cations: Ca<sup>2+</sup>, Mg<sup>2+</sup>, Fe<sup>2+</sup>, and Fe<sup>3+</sup>. Structural …
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The Effect of Minor Elements on the Physical and Chemical Properties of Lower Mantle Minerals at High-Pressure
… 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 abundant minerals in Earth's lower mantle, with aluminum-bearing (Mg,Fe)SiO3 perovskite occupying …
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The dynamics of oceanic transform faults : constraints from geophysical, geochemical, and geodynamical modeling
… geophysical data analysis and geodynamical and geochemical modeling. Chapter 1 examines the effect of fault segmentation on the maximum predicted earthquake magnitude of an oceanic transform fault system. Results of thermal modeling suggest that fault segmentation by intra- transform spreading …
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Hydrogeologic Controls on Groundwater Quality in the West Mamprusi Area, Northern Ghana
… major control on the highest TDS groundwater. Geochemical modeling with NETPATH did not corroborate groundwater flow paths determined from static water levels in many cases, suggesting that shallow aquifers reflect localized groundwater flow. The localized problems with contaminants such as …
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