# Browse Dissertations and Theses - Geology by Issue

• (2010-05-18)
ABSTRACT We tested an in situ method for monitoring the concentrations of aqueous chemical species and dissolved gases in groundwater. We deployed in situ samplers in 8 wells completed in the glacial Glasford formation ...

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• (2010-05-19)
Density bands in the CaCO3 (aragonite) skeleton of scleractinian corals are commonly used as chronometers, where crystalline couplets of high and low density bands represent the span of one year. Isotopic analysis of these ...

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• (2010-05-19)
The interaction of climate, tectonics, and topography in the Olympic Mountains of Washington State is explored to determine the influence of glaciers on spatially variable erosion and rock uplift rates. As glaciers have ...

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• (2010-05-18)
High-resolution particle-image velocimetry (PIV) experiments have been conducted over a fixed-bed to examine the effects of interacting barchan dunes on the flow structure. The barchan dune models were based upon an idealized ...

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• (2010-08-31)
A detailed understanding of the climate of the Pleistocene (1,800,000 years ago to 10,000 years ago) is crucial for constructing predictive models of future climate trends. Researchers studying past climate (paleoclimate) ...

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• (2011-01-14)
Understanding the composition of Earth’s inner core is crucial for revealing the mechanisms of core formation and the evolution of Earth. The presence of light elements in the Earth’s inner core has been indicated in recent ...

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• (2010-08-20)
We tested whether the gene expression of dissimilatory sulfite reductase (dsr mRNA), a critical enzyme in the sulfate reduction pathway, can serve as an indicator of the rate of sulfate reduction in natural systems. We ...

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• (2010-08-20)
Ice-walled lake plains (IWLPs) form along glacial margins in areas of stagnating ice. In Illinois, IWLPs tend to have low relief (<7m) and were formed during the last deglaciation of the Lake Michigan lobe (20,800 to 16,000 ...

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• (2011-01-14)
This study applies high precision 238U/235U measurement techniques two three geologic settings: basalt differentiation, uranium ore genesis, and the remediation of a uranium-contaminated groundwater system. In the latter ...

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• (1993)
One of the fundamental objectives of the extensive research on Creede district, Colorado, has been to determine the sources, pathways, and interactions of fluids involved in the genesis of the epithermal ores. From the ...

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• (2011-05-25)
Passive margin escarpments are large-scale geomorphic features which persist over timescales of tens of millions of years. The maintenance of steep topography over these timescales challenges conventional understanding of ...

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• (2011-05-25)
Analysis of sedimentological, stratigraphic, paragenetic and geochemical characteristics of samples from the Early Ordovician Shakopee Dolomite and Everton Formation, and the overlying Middle Ordovician St. Peter Sandstone, ...

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• (1989)
Oxygen isotope evidence from Caradocian Trenton Group brachiopods in the Mohawk Valley of New York suggests that Caradocian oceans were salinity-stratified and dominated at depth by warm, saline waters. $\delta\sp{18}$O ...

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• (2011-05-25)
A multidisciplinary study utilizing new ultrahigh-resolution microscopy techniques has been undertaken to reconstruct the paragenesis of Cambrian-age Mt. Simon Sandstone quartz arenites buried at 1.8-2.1 km within the ...

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• (1996)
Magnetic susceptibility (MS) zones, controlled by silt-size magnetite concentrations, have been delineated within oxidized, C horizon Peoria and Loveland Silts along the Illinois and Mississippi Valleys. Lower Peoria and ...

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• (1995)
The response of sediment, vegetation and aquatic environments to climate change during the last glacial--interglacial--glacial intervals were investigated from fossiliferous successions in four breached kettle basins in ...

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• (1991)
The geochemical characteristics of paleofluids in the White River Group played a vital role in controlling zeolitic alteration as well as the formation of calcretes. The White River Group is a terrestrially deposited ...

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• (2011-08-25)
Cyclothems record the sedimentary product of cyclicity in relative sea-level on either a regional or global scale, showing both regressive and transgressive phases. This study aims to contribute to our understanding of ...

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• (2011-08-25)
Seismic methods using natural earthquakes are commonly applied to investigate the velocity structures of the crust and upper mantle. Among all these methods, seismic tomography is one of the most powerful tools to image ...

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• (2010-05-19)
Geologists have long recognized the important role of continental-scale fluid flow as a mechanism for diagenesis, including the dissolution of rock and the deposition of Mississippi Valley-Type (MVT) minerals in sedimentary ...

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