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Browsing Geological Sciences Theses and Dissertations by Title
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Now showing items 1-20 of 164
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(University of Oregon, 2016-11-21)The mobilization and transformation of arsenic within the critical zone is a major cause of human suffering worldwide. Microorganisms, as they grow and utilize organic matter, accelerate redox processes that can transform ...
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(University of Oregon, 2020-02-27)The shapes of artiodactyl headgear play key roles in interactions with their environment and each other. Consequently, headgear morphology can be used to predict behavior. For example, larger, recurved horns are typical ...
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(University of Oregon, 2017-09-06)We propose a new method to integrate genome-scale metabolic models into biogeochemical reaction modeling. This method predicts rates of microbial metabolisms by combining flux balance analysis (FBA) with microbial rate ...
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(University of Oregon, 2012)Effusive volcanic eruptions repave landscapes rapidly with lava flows, resetting the underlying landscape and ecosystem. The unique physical properties of lava pose interesting challenges for recovery, as lava flows can ...
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Analysis of an Exposed Portion of the Badwater Turtleback Shear-zone, Death Valley, California, USA (University of Oregon, 2018-04-10)The exposed shear zone within the footwall of the Badwater turtleback presents an excellent opportunity to explore the brittle-ductile transition. Within this shear zone, a variety of lithologies preserve the last stages ...
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(University of Oregon, 2012)Seismic data from the intermediate-spreading Endeavour segment of the Juan de Fuca Ridge reveal several crustal-level, low-velocity, high-attenuation regions on the eastern and western ridge flanks 7 to 16 km from the ...
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(University of Oregon, 2023-03-24)Three to four billion years ago the surface of Mars may have been habitable. Ancient martian rocks that were subject to aqueous alteration in near-surface environments may store a record of this habitable paleoclimate, and ...
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(University of Oregon, 2019-09-18)Widespread extinctions of mammalian megafauna at the end of the Pleistocene epoch remain insufficiently explained. In North America, approximately sixty megafaunal species disappeared in a window between 13 and 11 ka that ...
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(University of Oregon, 2018-09-06)We carried out rhyolite ash sintering experiments in the presence of a mixed CO2-H2O vapor using both fine and coarse ash. Fine ash is barely sintered after 7 minutes and fully densified after about 30 minutes. Coarse ash ...
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(University of Oregon, 2016-11-21)Accurately distinguishing species in the fossil record is difficult when the extent of osteological variation in many modern animals is unknown. Research into intraspecific variation has been conducted in a number of groups, ...
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(University of Oregon, 2021-04-29)Granular flows are particle-laden gravity currents that are ubiquitous in nature in a variety of different geologic settings. Their high mobility and potential for harm to human populations and infrastructure motivate ...
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(University of Oregon, 1977-09)The purpose of this project was twofold - to synthesize several electron microprobe glass standards in the system: SiO2 - Al 2O 3 -- Cao -- MgO, and to utilize these standards in empirically calculating a set of binary ...
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(University of Oregon, 2015-08-18)Carbon and oxygen isotopes in calcite crystals provide a record of the environmental conditions under which the crystals formed. To investigate the influence of temperature, pH, and growth rate on isotope discrimination ...
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(University of Oregon, 2018-09-06)Large earthquakes often exhibit complex slip distributions and occur along non-planar faults, resulting in variable stress changes throughout the fault region. To better discern the role of stress changes and fluid flow ...
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(University of Oregon, 2022-02-18)Hogg Rock is a basaltic-andesite dome located in the Central Oregon Cascades. Its flat top, steep sides, and glacial striations and lakes have led to the interpretation that Hogg Rock was a dome that erupted subglacially. ...
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(University of Oregon, 2009-09)Spatial and temporal patterns of movement of the Boulder Creek earthflow were investigated using 26 interferograms derived from ALOS satellite radar images acquired between February 2007 and February 2008. Persistently ...
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(University of Oregon, 2022-02-18)Uranus and Neptune have dynamic magnetopause interfaces to the solar wind due to the orientation of their rotation and magnetic axes. The magnetohydrodynamic plasma description suggests that solar wind conditions in the ...
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(University of Oregon, 2024-03-25)Contamination of ground and well water by Cr and V from anthropogenic and geogenic sources has gained considerable attention over the last few decades due to environmental and public health concerns. The specific threat ...
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(University of Oregon, 2011-12)Whether or not a causal relationship exists between climate and mammal body size is one of the longest-standing and most intractable questions in ecology. The classic model of body size evolution (Bergmann's Rule) holds ...
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(University of Oregon, 2018-04-10)Feedbacks between climate, tectonics and erosion drive mineral dissolution in the subsurface and may provide strong controls on chemical weathering as a mechanism for modulating climate through CO2 drawdown. However, few ...
Now showing items 1-20 of 164