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Browsing Geological Sciences Theses and Dissertations by Title
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Now showing items 120-139 of 164
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(University of Oregon, 2020-12-08)Ice streams transport the majority of the ice lost to the ocean from the Antarctic Ice Sheet. In many cases these fast-flowing streams are bordered by nearly stagnant ice ridges that supply cold ice through lateral advection. ...
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(University of Oregon, 2012)Mafic eruptions have been the dominant form of volcanic activity in central Oregon throughout the Holocene. These eruptions have produced cinder cones, extensive lava flows, and tephra blankets. In most cases, the extent ...
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(University of Oregon, 2015-08-18)Melt inclusions record valuable information about pre-eruptive melt volatile concentrations. However, a vapor bubble commonly forms in inclusions after trapping, and this decreases the dissolved CO2 concentration in the ...
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(University of Oregon, 2014-09-29)Lava flows are common at volcanoes around the world and on other terrestrial planets, but their behavior is not fully understood. In Hawai`i, advances in remote sensing are offering new insights into lava flow emplacement. ...
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(University of Oregon, 2012)Cenozoic tectonics of the Pacific Northwest (PNW) and the associated mantle structures are remarkable, the latter revealed by EarthScope seismic data. In this thesis we model teleseismic body waves constrained by ambient-noise ...
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(University of Oregon, 2012)In many mountainous settings, landslides are the primary geomorphic agent that sets fundamental landscape characteristics, such as topographic relief and catchment-averaged erosion rate. The coupled system of landslides ...
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(University of Oregon, 2014-10-17)The recent rise of inner shelf hypoxia in the California Current System has caused concern within the scientific community, sparking a surge in studies addressing the issue. While regional studies of hypoxia abound, ...
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(University of Oregon, 2012)In order to better understand the interactions between climate change, landscape erosion and sedimentation, a detailed study was conducted on Plio-Pleistocene non-marine deposits of the Palm Spring Group in the Fish ...
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(University of Oregon, 2017-05-01)The Miocene to Pliocene southern Bouse Formation preserves a record of depositional environments immediately prior to and during integration of the Colorado River to the Gulf of California. Uncertainty over Bouse ...
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(University of Oregon, 2015-01-14)The ~5.6-4.8 Ma Bouse Formation, exposed along the lower Colorado River, contains a well exposed but debated record of river integration. Sedimentologic and stratigraphic analysis aid interpretation of depositional ...
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(University of Oregon, 2020-02-27)I use seismic analysis of teleseismic data to constrain the isotropic and anisotropic mantle structure of the Cascadia subduction zone (CSZ). This work begins by estimating seismic anisotropy parameters beneath the Juan ...
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(University of Oregon, 2011-09)Vigorous convective activity in the western U.S. mantle has long been inferred from the region's widespread intra-plate crustal deformation, volcanism, and high elevations, but the specific form of convective activity and ...
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(University of Oregon, 2011-03)The Pacific Northwest of the United States has been tectonically and magmatically active with the accretion of the Farallon oceanic terrane "Siletzia" ∼50 Ma. The accretion of Siletzia terminated the flat-slab subduction ...
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(University of Oregon, 2012)We investigate upper crustal anisotropy of the Endeavour Segment of the Juan de Fuca Ridge using shear wave splitting measurements of ~3000 earthquakes recorded during three years using the Keck seafloor seismic network. ...
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(University of Oregon, 2024-01-09)The oxygen isotopic composition of calcite is widely used in paleoclimate studies to infer the temperatures of carbonate formation across a wide range of geologic environments including hydrothermal veins, caves, lakes, ...
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(University of Oregon, 2016-11-21)This thesis presents a new calibration of the Ginkgo stomatal index as a proxy for atmospheric CO2 concentrations using leaves from modern Ginkgo biloba herbarium specimens. Scanning electron images were obtained to count ...
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(University of Oregon, 2017-09-06)The mechanisms and timescales associated with the triggering of caldera-forming eruptions remain ambiguous and poorly constrained. Do such eruptions start vigorously, then escalate, or can there be episodicity? Are they ...
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(University of Oregon, 2014-06-17)Sedimentary rocks in the Mecca Hills record a 3-4 Myr history of basin evolution and deformation within the southern San Andreas fault (SAF) zone. Detailed geologic mapping, measured sections, lithofacies analysis, and ...
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(University of Oregon, 2020-02-27)Contrasting hypotheses for the depositional paleoenvironments of the late Miocene to early Pliocene southern Bouse Formation currently hinder progress toward a consensus on tectonic and paleogeographic reconstructions for ...
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Structural Evolution of the Virgin Spring Phase of the Amargosa Chaos, Death Valley, California, USA (University of Oregon, 2013-10-10)The Amargosa Chaos and Fault of Death Valley are complex features that play important roles in various tectonic models. Some recent models claim the fault is a regional detachment accommodating 80 km of NW-directed transport ...
Now showing items 120-139 of 164