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Showing 1 to 20 of 21 for “"Organic Geochemistry"”.
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Organic geochemistry and stable isotope constraints on Precambrian biogeochemical processes
Details of the biogeochemical cycles and the dominant mechanisms present in Precambrian remain heavily debated topics. The events of the Late Proterozoic onset to glaciations and what types of early life existed in the Archean are two of the many provoking topics within the Precambrian. We set out …
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Organic geochemistry of an oil and gas seep in northern Gulf of Mexico sediments
… cores were recovered which had visible liquid organic deposits. In three of the cores deposits were observed concentrated in oblique fracture planes. Other occurrences included large deposits as liquid veins and smaller disseminated pockets in gassy and non-gassy sediments. The benzene soluble …
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Inorganic and organic geochemistry of the zinc ores of the Idol Mine, East Tennessee
The Idol Mine, operated by Clinch Valley Mining Company, is located at the southern end of the Copper Ridge District in Northeastern Tennessee. It is a relatively typical carbonatehosted zinc (Mississippi valley Type) deposit. The ores occur as interfragmental fillings within carbonate breccia …
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Environmental organic geochemistry of sediments from Wadi Gaza and investigation of bioremediation of petroleum derivatives and herbicides by cyanobacterial mats under different experimental conditions
… presents for the first time results of (i) an organic geochemical analysis of sediments from Wadi Gaza, and (ii) an investigation of the degradation potential of naturally occurring cyanobacterial mats originating from Wadi Gaza. In the Wadi Gaza sediments, the presence of pristane and phytane, …
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Dinoflagellate Cyst Biostratigraphy, Palynofacies and Paleoenvironmental Analysis of the Maastrichtian and Basal Danian, Brazon River, Texas
… are combined with ?13C and ?18O stable isotope geochemistry and TEX86 and BIT Index organic geochemistry data for paleoenvironmental interpretations. Biostratigraphically important species of dinoflagellates divide the section into three intervals. Interval 1 occurs within the Neylandville …
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Marine sedimentary organic matter : delineation of marine and terrestrial sources through radiocarbon dating; and the role of organic sulfur in early petroleum generation
… project. All of the projects are related to the organic geochemistry of marine sediments, however, this is a fairly encompassing area of study. Chapters 1 and 2 stem from the same experimental study -the use of hydrous-pyrolysis to investigate mechanisms leading to the production of …
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Marine sedimentary organic matter: delineation of marine and terrestrial sources through radiocarbon dating; and the role of organic sulfur in early petroleum generation
… project. All of the projects are related to the organic geochemistry of marine sediments, however, this is a fairly encompassing area of study. Chapters 1 and 2 stem from the same experimental study -- the use of hydrous-pyrolysis to investigate mechanisms leading to the production of …
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Organic Phosphorus Dynamics and Contributions to Eutrophication in a Shallow, Freshwater Bay
… for aquatic life; cycling between both inorganic and organic forms to maintain an ecological balance. Its addition into P-scarce freshwaters, either through terrestrial (external) or sedimentary (internal) loading, may disrupt this balance causing blooms of phytoplankton to flourish, often …
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Compositional heterogeneity within oceanic POM : a study using flow cytometry and mass spectrometry
… statistics to the study of marine particulate organic matter (POM) collected from the North Atlantic. DT-MS is an important asset to marine organic geochemistry as a single two minute analysis (with 16 eV, EI+ ionization) provides information on polysaccharides, proteins, and lipids within …
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Molecular studies of the sources and significance of archaeal lipids in the oceans
… well understood. Here, I paired techniques of organic geochemistry and molecular biology to explore the sources and significance of archaeal tetraether lipids in the marine water column. Using metagenomics, 16S rDNA pyrosequencing, QPCR and mass spectrometric analyses, I found that uncultivated …
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Paleoenvironment reconstruction in extreme climates using organic geochemical investigations
Organic geochemistry provides researchers with an extensive suite of tools for reconstructing past environments. Using these tools, a set of unique locations situated in climatic extremes have been investigated. During the Early Cenozoic the planet was much warmer than today. In addition to this …
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Characterisation of unresolved complex mixtures of hydrocarbons by degradative methods
… work have been published [Revill et al. (1991), Organic Geochemistry: Advances and Applications in Energy and the Natural Environment, Manchester University Press
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An organic geochemical approach to problems of glacial-interglacial climatic variability
… isotopic composition (δ13C) of sedimentary organic carbon (Corg), N/C ratios, and terrigenous and marine δ13C-Corg end-members form a basis from which to address problems of Late Quaternary glacial-interglacial climatic variability in a 208.7 m hydraulic piston core (DSDP 619) from the Pigmy …
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A multi-proxy study of the Palaeocene - Eocene Thermal Maximum in northern Spain
… of carbon, and mobilisation of different organic matter (OM) pools as a response to the climate change. The sections studied span a continental to marine transect in northern Spain. This represents the first organic geochemical study of these PETM sections, one of the first comparisons of …
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Depositional constraints on lacustrine carbonates from the Winnemucca Dry Lake Basin, Nevada, USA
… petrographically, and analyzed for trace element geochemistry, stable isotope geochemistry, and organic geochemistry. Textural variations were found to result primarily from variations in water temperature and microbial influence. Early deposition of tufas occurred in cold, relatively lowstand …
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Characterisation and environmental effects of unresolved complex mixtures of hydrocarbons
… work have been published [Thomas et al., (1993) Organic Geochemistry, Falch Hurtigtrykk, Non%-ay(A bstract), 717-719; Thomas et al., (1995) [Vater Research. 29,371-382]. iv
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COMBINING GEOCHEMICAL AND NUMERICAL MODELING FOR CHLORINATED SOLVENTS GROUNDWATER CONTAMINATION
… approach, spanning from hydrogeology, organic geochemistry and microbiology. While expert knowledge and laboratory analyses provide initial inputs for the design of SBS, field monitoring data are needed to evaluate if and how bioremediation is carried out. Reactive transport models …
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Multi-Disciplinary Analyses of Outcropping Late Cretaceous Clinoform Stratigraphy, Magallanes Basin, Chile
… are critical transfer zones where sediment, organic matter, and associated fluids move from continents to deep-marine basins. Clinoforms, shelf-edge deltas, submarine canyons, and deep-water channels are central components of these systems, yet their stratigraphic architecture, …
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Lipid Biomarkers of Bering and Chukchi Sea Euphausiids and Their Application to Diet History
<p>In the eastern Bering Sea, <em>Thysanoessa raschii</em> are the most abundant krill species and a keystone trophic member that serve as both an important grazer and link to upper level consumers. In this system krill experience large annual variation in food resources, especially during ice …
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