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 17 of 17 for “"Carbonate dissolution"”.
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Seagrass-Mediated Carbonate Dissolution and Early Diagenesis in Bahamas Bank Sediments
… examining the role that seagrasses play in carbonate dissolution and early diagenesis of Bahamas Bank sediments. Three aspects of this problem are addressed: (1) stable carbon isotopes as an indicator of early diagenesis of carbonates, using results of a field study; (2) carbonate …
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MAJOR AND MINOR ION GEOCHEMISTRY OF GROUNDWATERS FROM BERMUDA
… Ghyben-Herzberg/freshwater-seawater mixing, carbonate dissolution and recrystallization, redox and the hydrology. The major ions calcium, magnesium and strontium have been previously studied by Plummer et al. (1976) near these two marshes and across the Devonshire lens. This study focuses on …
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Marine carbonate accumulation during the greenhouse climate of the Eocene
… with significant fluctuations in the oceanic carbonate saturation horizons. This study documents changes in carbonate dissolution indices and carbonate mass accumulation rate through the entire Eocene (56–34 Ma) at ODP Site 1209 on Shatsky Rise, north-central Pacific and ties it to a stable …
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Novel Insights into the Hydrogeochemical Evolution of Groundwater within the Transboundary Milk River Aquifer
… elevated sulphate from pyrite oxidation, carbonate dissolution, cation exchange, and a Na-HCO₃-SO₄ water type. Zone 2, from 50–75 km, records sulphate depletion through bacterial sulphate reduction, organic matter oxidation, silicate dissolution, and transition to a Na-HCO₃ water type. …
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Carbon Cycling Dynamics Inferred from Carbon Isotope Sourcing in a Mid-Latitude Karst-Influenced River
… soil respiration (34%). Groundwater dissolving carbonate bedrock and carbonate dissolution/precipitation reactions contributed 31% and 11%, respectively. The more carbonate-dominated downstream catchment also was influenced greatly by soil respiration (35%). Due to the more pronounced levels of …
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Effect of Various Saturation Levels, Leaching Solution pH, and Leaching Cycle on Electrical Conductivity from Coal Mine Spoil Leachate
… pH, EC level, and the release of sulfate, bicarbonate, and associated cations by potentially affecting trace sulfide oxidation and carbonate dissolution reactions. Little evidence of saturation was noted with the standard method. Leaching solution bulk chemistry did not alter leachate …
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Permanence and Life Cycle Performance of Biocementation Soil Improvement
… granular soils through the generation of calcium carbonate minerals on soil particles surfaces and at interparticle contacts. The process can offer an environmentally beneficial alternative to conventional ground improvement methods, which have traditionally relied on energy-intensive …
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Climate change and anthropogenic effects on shallow-water carbonate biogeochemistry
… state of surface ocean waters with respect to carbonate minerals will decline during the twenty-first century owing to increasing atmospheric CO2. As a result calcareous organisms could have difficulty calcifying, leading to production of weaker skeletons and their greater vulnerability to …
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Carbon Dioxide Flooding Induced Geochemical Changes in a Saline Carbonate Aquifer
… which reacts with the host rock to dissolve carbonate minerals. Dissolution of carbonate minerals may compromise the integrity of the formation, leading to the eventual escape of CO2 to the surface. In order for CO2 sequestration to be effective, CO2 must remain below the surface …
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Examining Aspects of Copper and Brass Corrosion in Drinking Water
… ratio, pH, phosphate, iron, aluminum, bicarbonate and organic matter levels are altered. In some cases, these changes will be beneficial and in other detrimental. This research project is the first to systematically evaluate the effect of some key changes in the chemistry of the treated …
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A central Texas drying event identified at the Younger Dryas-early Holocene transition using coupled speleothem 𝛿¹³C-¹⁴C analysis
… activities can result from changes in epikarst carbonate dissolution due to variable CO2 ventilation or pore space moisture. A decrease in the proportion of ¹⁴C-free carbon (the dead carbon proportion, DCP) to 0% is interpreted as a change from partial dissolution in a water-saturated closed …
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Assessing the Potential for Carlin-type Gold in Northern Nye County, Nevada
… with known occurrences of Carlin-type, carbonate-hosted, and ow sulfidation epithermal gold mineralization.A total of 119 drainage basins are highlighted as geochemically prospective for Carlin-type mineralization through FA. However, this technique does not differentiate between …
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Formation waters in petroleum reservoirs : their controls and applications
… waters is controlled by the introduction of bicarbonate through carbonate dissolution and methane/coal oxidation leading to leaching of Na-bearing clay minerals, and by ion exchange on clay minerals and dilution by meteoric waters in certain locations. The time series of produced waters from …
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Reconsidering Lead Corrosion in Drinking Water: Product Testing, Direct Chloramine Attack and Galvanic Corrosion
… in the test waters and a failure to control carbonate dissolution from the atmosphere. Due to these deficiencies, small devices made of pure lead could actually pass the performance test. The public therefore has no assurance that devices passing NSF Section 8 testing are safe and reforms to …
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Patterns of Lithology, Structure, Alteration, Trace Elements, Carbonate Mineralogy, and Stable Isotopes around High-Grade Carlin-type Gold Deposits: Turquoise Ridge Deposit, Getchell District, Nevada
… ore zones at the Turquoise Ridge CTGD. Carbonate staining was utilized to determine differences in carbonate mineralogy associated with more reactive and non-reactive carbonate host-rocks (Chapter 2). Stable isotopes (δ 18O and δ13C) are presented in Chapter 3 to test for the presence of …
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Refinement and application of a new paleotemperature estimation technique
… the effect on Uk37 of conditions that cause dissolution of carbonates in the sediment, and methods of storage and 'sample handling. These are two problems that must be resolved before the method can be applied rigorously and quantitatively to sediments for paleotemperature estimations. A …
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PCO2 EFFECTS ON THE PRODUCTION OF PELAGIC BIOGENIC CARBONATE AND OCEAN CHEMISTRY: A CASE HISTORY FROM THE CRETACEOUS.
… of OAE1a is marked by: (a) a drastic drop in carbonate, (b) demised nannoconids, (c) abundant mesotrophic species B.constans, Z.erectus, and D.rotatorius, represented by dwarf coccoliths, and (d) a large number of W.barnesiae deformed specimens affected by reduced size and marked ellipticity. …