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Browsing Geological Sciences Theses and Dissertations by Title
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Now showing items 126-145 of 164
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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 ...
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(University of Oregon, 2021-11-23)The behavior of sulfur (S) in volcanic arcs is of fundamental importance to a wide range of geologically and societally relevant processes. Despite this, the influence of subduction on the sulfur content of primitive arc ...
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(University of Oregon, 2010-06)Burrowing rodents are important ecosystem engineers in today's environments. The fossil record offers the opportunity to study patterns and processes in the evolution of the burrowing rodent guild through the Cenozoic. ...
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(University of Oregon, 2024-08-07)The evolution of mammalian biodiversity is a complicated process with many complex drivers and mechanisms. It has been a topic of unique interest for several centuries and has been explored from multiple angles. Frequently, ...
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(University of Oregon, 2020-12-08)Interpreting volcanic behavior is challenging because the phenomena controlling volcano eruptibility occur at substantial crustal depths. However, volcanic gases are a measurable surface expression of subterranean magmatic ...
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(University of Oregon, 2021-11-23)The Miocene Grey’s Landing ignimbrite is a large (≥ 23,000 cubic km), intensely welded, highly rheomorphic extremely high-grade ignimbrite. The cause of rheomorphism can be attributed to syn-depositional strain heating and ...
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(University of Oregon, 2020-12-08)The Miocene to post-Miocene geologic history of Northeastern Oregon and West-Central Idaho is difficult to parse because this area has experienced several dramatic events. Within 35 km of each other, there are exposures ...
Now showing items 126-145 of 164