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 11 of 11 for “"Sedimentary Systems"”.
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A STUDY OF THE METAL-BINDING ORGANIC CONSTITUENTS IN GREAT BAY SEDIMENTARY SYSTEMS
<p>The fact that the concentration of copper in pore fluids exceeds the values predicted by simple solubility products has led to the suggestion that the copper is solubilized by the formation of copper-organic matter complexes. Previous attempts by other workers to form these complexes have …
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The sedimentary record of seafloor uplift
… of the seafloor and subsurface influences sedimentary systems, hydrocarbon distribution, paleoclimate archives, and poses significant geohazard risks. This thesis investigates the different origins, evolution, and impacts of various uplifting mechanisms on deep-water sedimentary records …
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Using benthic microalgae as an indicator of recreational disturbance associated with bait collection and trampling in Langebaan Lagoon, South Africa
… response to environmental change in intertidal sedimentary systems. However, future research should build on this study to refine how the tool can be used in heterogeneous environments to assist managers to monitor ecosystems rapidly to prevent degradation.
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Deep-marine depositional systems of the western North Atlantic: Insights into climate and passive-margin evolution
Stratigraphic successions of sedimentary rocks represent an important repository for signals pertaining to the history and evolution of Earth. Whereas the specific processes reflected by the stratigraphic record differ with respect to a given depositional environment, deposits in deep-marine …
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Assessing the effects of trampling and bait-collecting on population, morphological and reproductive metrics of a key ecosystem engineer in Langebaan Lagoon
Coastal sedimentary habitats, like Langebaan Lagoon, provide vital ecological and economic services that many human livelihoods rely upon. However, they are vulnerable to multiple human-related disturbances such as intense bait collection and trampling, that compromise ecosystem resilience and …
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Quantitative approaches and applications to the sequence stratigraphy and biodiversity of Pleistocene – Holocene mollusk communities from the Po plain, Italy and San Salvador Island, the Bahamas
… use modern ecological data and modern marine systems to evaluate past marine depositional settings and the preservation potential of various environments in the geological record. While the chapters in this dissertation vary in terms of study area, sedimentary systems (carbonate vs. …
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Fundamental magnetic properties of Greigite (Fe3S4)
… in sulphate-reducing marine and lacustrine sedimentary systems. Its presence can significantly affect palaeomagnetic and environmental magnetic records. Understanding the recording characteristics of any magnetic mineral requires that its fundamental magnetic properties are known. However, …
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Tectonic Exhumation and Climate Driven Erosion in Extensional Mountain Blocks: Two Examples from California, USA
… mass fluxes from extensional mountains blocks to sedimentary basins over 104-5 yr timescales is debated. In the eastern California-Walker Lane shear zone, exposures of sedimentary basin fill allow inversion of erosion- and sediment-flux rates from a linked catchment-fan system within an …
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Architecture of fluvio-deltaic sandbodies: the Namurian of Co. Clare, Ireland, as an analogue for the Plio-Pleistocene of the Nile Delta
… and climate. When combined with the intrinsic sedimentary variability of deltas, this makes prediction of the internal facies distributions and architectures of deltaic sandbodies a challenging task. The aim of this thesis is to conduct a detailed qualitative and quantitative field study of …
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Characterization and prediction of long-term arsenic mobility, dissolution, and kinetic behavior in arsenic contaminated floodplain deposits of Whitewood Creek and the Belle Fourche River, South Dakota
… arsenic mobility appropriate to fluvial sedimentary systems; investigating mechanisms of arsenic mobilization, adsorption/desorption kinetics, and the effects of pH, changing redox conditions, etc., however, these studies were conducted on relatively short time scales and did not quantify …
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Interactions between ecosystem engineering by burrowing sandprawns (Callichirus kraussi) and nutrients: consequences for benthic community structure and ecosystem functioning
… particularly in shallow soft- littoral ecosystems. At a local level, such systems are dominated by allogenic engineers such as the burrowing axiid sandprawn Callichirus kraussi Stebbing, which has important effects on macro- and meiobenthic assemblages. C. kraussi is distributed across the …