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Articles 1 - 12 of 12
Full-Text Articles in Geochemistry
Diatom-Inferred Hydroclimate Variability In Marl Lake, Wi Over The Past ~2050 Years, Christian E. Sizemore
Diatom-Inferred Hydroclimate Variability In Marl Lake, Wi Over The Past ~2050 Years, Christian E. Sizemore
All-Inclusive List of Electronic Theses and Dissertations
Hydroclimate variability in the Midwest has increased over the past few decades, as as evidenced by increases in average precipitation and frequency of extreme hydroclimate events. Understanding natural climate variability in this region will help communities in the Midwest to better prepare and mitigate the risks associated with extreme hydroclimate variability in the future. Natural lakes in the Midwest are often effective archives of hydroclimate; many have been shown to respond directly to changes in climate both locally and regionally. We extracted a 4.5-meter sediment core, representing approximately 2050 years of sediment accumulation, from the deepest part of Marl Lake …
Introduction To Nuclear Magnetic Resonance Spectroscopy In A Geochemical Setting, Evan Mack
Introduction To Nuclear Magnetic Resonance Spectroscopy In A Geochemical Setting, Evan Mack
University Honors College
Nuclear magnetic resonance (NMR) spectroscopy is a powerful analytical tool that is heavily employed in organic chemistry, but lacks use in geochemistry. The technique is most useful for characterization and structural analysis of analytes, but also sees use in kinetics analysis, speciation, and detection. This work aims to answer these questions regarding NMR spectroscopy’s use in geochemical settings: Which nuclei are studied? For what purposes is each nucleus studied? What affects the scope of the technique and has caused it to not be widely used? How often is NMR spectroscopy used? What trends are there in the technique’s use? The …
Estimating Land Surface Temperature Using A Thermal Sharpening Technique, Yitong Jiang, Qihao Weng
Estimating Land Surface Temperature Using A Thermal Sharpening Technique, Yitong Jiang, Qihao Weng
Symposium 2012
No abstract provided.
Determining Chemical Signatures Of Geologic Materials For Establishing Provenience Of Anasazi Red And Gray Wares Using Esem-Eds And Icp-Ms, Champagne Springs Ruins, Co, Steven Mathew Di Naso
Determining Chemical Signatures Of Geologic Materials For Establishing Provenience Of Anasazi Red And Gray Wares Using Esem-Eds And Icp-Ms, Champagne Springs Ruins, Co, Steven Mathew Di Naso
All-Inclusive List of Electronic Theses and Dissertations
Compositional analyses of prehistoric ceramics and geological materials allow archaeologists to establish provenience of artifacts through comparative analysis of the materials used in prehistoric ceramic production. Where pottery clay pastes and tempering constituents originate from locally or regionally available geological materials, identifying their chemical composition and their geographic location and distribution facilitates a better understanding of the inter and intra socio-spatial and socioeconomic patterns among neighboring communities. The Champagne Springs Ruins were occupied during the late Pueblo I (A.D. 700 -A.D. 900) to early Pueblo II (A.D. 900 TO A.D. 1100) periods. The traditional view of local ceramic production from …
The Impact Of Acid Mine Drainage On West Little Sugar Creek, Vigo Co., In, Jodie L. Gibson
The Impact Of Acid Mine Drainage On West Little Sugar Creek, Vigo Co., In, Jodie L. Gibson
All-Inclusive List of Electronic Theses and Dissertations
This study evaluates the degree and extent of contamination in West Little Sugar Creek by analyzing water chemistry in the stream during low and moderate flow conditions. West Little Sugar Creek is located in Vigo County, Indiana and has been severely impacted by AMD discharging from the abandoned Green Valley Mine site. Stream water is commonly acidic (as low as pH 2.4) with elevated concentrations of Fe and Al and elevated trace elements including Ni, Zn, Cu, Cd, Cr, Co, and others, many of which exceed local and/or national surface water quality standards. Amorphous Fe and Al precipitates also form …
Geochemistry Of Benthic Foraminifera As An Environmental Indicator: A Study From Multiple Hydrographic Regimes, Chandranath Basak
Geochemistry Of Benthic Foraminifera As An Environmental Indicator: A Study From Multiple Hydrographic Regimes, Chandranath Basak
All-Inclusive List of Electronic Theses and Dissertations
The geochemistry (stable isotopes and Lracc clements) or living (sLaincd) calcareous benthic foraminifera was compared with ambient botlom water stable isotope values to provide modern analog conditions and calibrations for environmental and paleoenvironmental assessments. Stable isotope values of live (stained) bcnthic foraminifera were investigated from push core and multicorer samples from the North Pacific (on the Aleutian margin, water depth 1988m) and the South Australian Bight (water depth 2476m and 1634m). Living benthic foraminifera specimens collected from contaminated sites in the Venice Lagoon were analyzed for trace elements. Both the isotopic and the trace element study involved interpretation of modern …
Classifying Mollisol Soils Using Hyperspectral Remote Sensing Data, Adil M. Wadia
Classifying Mollisol Soils Using Hyperspectral Remote Sensing Data, Adil M. Wadia
All-Inclusive List of Electronic Theses and Dissertations
Soil classification is a complex task that involves several factors. Soil classifications that have been published usually need to be updated as soil series definitions and boundaries change over time. Most existing soil classification surveys in the United States, although often very good, lack the required accuracy for selected applications such as precision agriculture. 111 Hyperspectral remote sensing data, with its 100+ bands and very high spectral resolution can help facilitate soil classification detail not achieved through traditional remote sensing methods. The study area selected for research was Wolf Field, near Homer, Champaign County, Illinois, which is a very agriculturally …
From Sand To Sandstone: Documenting The Total Change During Diagenesis, Wilfrido Solano-Acosta
From Sand To Sandstone: Documenting The Total Change During Diagenesis, Wilfrido Solano-Acosta
All-Inclusive List of Electronic Theses and Dissertations
The objective of this study is to provide a more comprehensive picture of sandstone diagenesis from a different perspective; starting from an analog sand serving as a precursor of a lithified sandstone.
The Petrology And Geochemistry Of Volcán Huaynaputina, Southern Peru, Steven R. Schubring
The Petrology And Geochemistry Of Volcán Huaynaputina, Southern Peru, Steven R. Schubring
All-Inclusive List of Electronic Theses and Dissertations
The 1600 eruption of Vol can Huaynaputina in Southern Peru was one of the largest historic eruptions (VEl 6). The eruption proceeded in three stages containing the same mineral assemblage of plagioclase>homblende>biotite> Fe-Ti oxides±apatite. Differences in crystal content, vesicularity, volatile content, temperature estimates, and the presence of disequilibrium textures have brought into question the petrogenesis of the 1600 eruption products. This work strives to quantify the pre- and syn-eruption magmatic conditions in order to ascertain the petrogenesis of the eruption products. Stage I was less evolved(~ 73% Si02), volatile rich (:S 5.3% H20), crystal poor (17- 26 wt. …
Chemical Weathering Of Volcanic Ash As A Probable Origin Of Chert In The Reid's Mistake Formation Of The Newcastle Coal Measures, Sydney Basin, Australia, Adil M. Wadia
All-Inclusive List of Electronic Theses and Dissertations
Chert is normally considered to be marine biogenic in origin. However, chert lenses and nodules in the volcanic ash horizon of the Reid's Mistake Formation at Swansea Head, Newcastle Coal Measures of the Sydney Basin appear to have formed differently. Their mode of occurrence and their close association with paper-thin clay layers within the same volcanic unit suggest that they formed as a result of chemical weathering of volcanic ash. This hypothesis is supported by the data gathered from thin section petrography and x-ray diffraction analyses. Petrographic studies indicate the precipitation of microcrystalline to cryptocrystalline quartz and the dissolution/replacement/alteration of …
Lithologic And Structural Controls On Karst Landforms Of The Mitchell Plain, Indiana, And Pennyroyal Plateau, Kentucky, Frederick Jennings Woodson
Lithologic And Structural Controls On Karst Landforms Of The Mitchell Plain, Indiana, And Pennyroyal Plateau, Kentucky, Frederick Jennings Woodson
All-Inclusive List of Electronic Theses and Dissertations
Karst features in Harrison County, Indiana, and the Mammoth Cave region, Kentucky, are profoundly influenced by lithology and structure. In the Sinkhole Plain two classes of sinkholes, shallow solutional and deeper subsidence, differ in morphology, origin, age, distribution, and density. Distributions of the two kinds of sinkholes reflect the outcrop pattern of specific lithostratigraphic units. Broad shallow dolines (Ste. Genevieve-type sinks) develop on the Horse Cave Member of the St. Louis Limestone and on the Ste. Genevieve, Girkin, and Paoli Limestones. Innumerable steeper-sided subsidence and collapse depressions (St. Louis-type sinkholes) form on the Corydon Chert Member, lower St. Louis Limestone, …
The Geology Of The Pittsburg Landing Area, Snake River Canyon, Oregon-Idaho, David L. White
The Geology Of The Pittsburg Landing Area, Snake River Canyon, Oregon-Idaho, David L. White
All-Inclusive List of Electronic Theses and Dissertations
The major purpose of the study was to map, describe, and correlate the pre-Tertiary rocks. Accessible and excellent exposures at Pittsburg Landing enabled the writer to make a somewhat detailed study of the stratigraphy. The thesis area also offered an opportunity to study in a reconnaissance manner, the Tertiary Columbia River Basalt as described by Waters, and more recently y Ozier.