Index Catalog // ScholarsArchive@OSU

Helium isotope variations in peridotite, gabbro and basalt from the Kane Oceanic Core Complex

Creator:: Konrad, Kevin
Abstract:: The Kane Oceanic Core Complex (OCC) is a valuable window into crustal architecture and chemical composition of the lithosphere beneath a slow-spreading ocean ridge. A suite of > 30 samples (comprised of whole rocks, mineral separates and basalt glasses) has been analyzed for ³He/⁴He isotope ratios and He concentrations. Gas...
Resource Type:: Masters Thesis
Full Text:: : __________________________________________________ David W. Graham The Kane Oceanic Core Complex (OCC) is a valuable window into crustal

A trace element study of plagioclase and clinopyroxene phenocrysts in historical lavas from Mt. Etna, Sicily, by laser ablation ICP-MS

Creator:: Russo, Christopher J.
Abstract:: Understanding magmatic processes occurring at depth in magmatic systems is fundamental for a more complete understanding of the variations sampled in lavas erupted from these systems on the Earth's surface. This thesis presents the results of detailed trace element analyses of plagioclase and clinopyroxene phenocrysts measured by laser ablation-inductively coupled...
Resource Type:: Masters Thesis
Full Text:: . Abstract Approved: David W. Graham Understanding magmatic processes occurring at depth in magmatic

The effects of the Mazama tephra-falls : a geoarchaeological approach

Creator:: Matz, Stephan E.
Abstract:: About 7,000 years ago two major tephra-falls blanketed the Pacific Northwest in volcanic ash. These two tephra-falls, identified as the Llao and climatic tephra-falls, were a part of the eruptive events that led up to the collapse of Mount Mazama to form Crater Lake in the southern Oregon Cascades. The...
Resource Type:: Masters Thesis
Full Text:: time and comments. Dr. David Brauner, the chair of my committee, got me started in archaeology and

Basaltic volcanism and tectonics of the High Lava Plains, southeastern Oregon

Creator:: Jordan, Brennan T.
Abstract:: The High Lava Plains province (HLP) of southeastern Oregon is a Miocene to Recent volcanic upland characterized by widespread basaltic volcanism and west-migrating rhyolitic volcanism. New ⁴⁰Ar/³⁹Ar ages for HLP rhyolites demonstrate that the trend of migrating rhyolitic volcanism is robust, reflecting westward migration at a rate of -35 km/m.y....
Resource Type:: Dissertation
Full Text:: Tectonics of the High Lava Plains, Southeastern Oregon. Abstract approved: David W. Graham The High Lava

New Insights into Mantle Dynamics from Helium Isotopes and Argon Geochronology

Creator:: Konrad, Kevin
Abstract:: Earth’s mantle extends to nearly 3000 km depth, comprises >80 % of Earth’s total volume, and has the largest influence on the primordial and radiogenic heat budget. Despite its importance, the structure and composition of the mantle is still debated. There are three primary models for Earth’s mantle structure that...
Resource Type:: Dissertation
Full Text:: : _____________________________________________________ David W. Graham Anthony A.P. Koppers Earth’s mantle extends to nearly 3000 km

Interpreting geology in Yosemite National Park, California : a monument to strong granite, powerful glaciers, and the perseverance of life

Creator:: Dunham, Sarah E.
Abstract:: This thesis develops a thematic, geology-based interpretive training manual for the interpretive staff at Yosemite National Park (YNP), California. The manual will help staff understand and convey geologic principles to park visitors who are all experiencing a dynamic landscape comprised of glacially-sculpted igneous rocks. Basic geology and the results of...
Resource Type:: Masters Thesis
Full Text:: friends and loved ones were invaluable during this process. Thank you Mom, Dad, Elaine, David, Barbara

Creating a Predictive Model of Cinder Cone Evolution in Central Oregon

Creator:: Das-Toke, Shyam P.
Abstract:: Cinder cones are useful geomorphic features for geological analysis because they generally have known initial states and follow a similar pattern of degradation as they are exposed to erosive processes. This is largely because cinder cones are produced by monogenetic eruptions. Characterizing large cinder cone fields in terms of age...
Resource Type:: Masters Thesis
Full Text:: , Dr. Eric Kirby, and Dr. David Cann, who provided input on my thesis and reviewed drafts several

Timescales and tectonics of oceanic plateaus : long-term evolution of Ontong Java Nui and Rio Grande Rise

Creator:: Davidson, Peter C.
Abstract:: Oceanic plateaus are regions of overthickened oceanic crust and are often thought to form from the interaction of mantle plumes with oceanic lithosphere. These regions can cover vast areas of the ocean basins and represent a highly elevated magmatic flux relative to normal mid-ocean ridge spreading. Oceanic plateaus are considered...
Resource Type:: Dissertation
Full Text:: ., Asael, D., Planavsky, N.J., Francois, R., McKenzie, N.R., Erba, E., Crowe, S.A., 2021. Pulsed

Patterns and processes of sediment transport following sediment-filled dam removal in gravel bed rivers

Creator:: Stewart, Gregory B.
Abstract:: Dam removal is increasingly viewed as a river restoration tool because dams affect so many aspects of river hydrology, geomorphology, and ecology; but removal also has impacts. When a dam is removed, sediment accumulated over a dam’s lifetime may be transported downstream; and the timing, fate and consequences of this...
Resource Type:: Dissertation
Full Text:: McKenzie River, OR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32 3.3 Map

Temporal and spatial variability of groundwater nitrate in the southern Willamette Valley of Oregon

Creator:: Mutti, Jeffrey Glenn
Abstract:: Groundwater nitrate contamination is a well-documented issue in the Southern Willamette Valley (SWV) of Oregon, as a Groundwater Management Area (GWMA) has recently been declared. As a GWMA, groundwater nitrate monitoring must occur until regional concentrations are below 7 mg/L NO3-N. However, the presence of temporal variability can make it...
Resource Type:: Masters Thesis

ScholarsArchive@OSU

Helium isotope variations in peridotite, gabbro and basalt from the Kane Oceanic Core Complex

A trace element study of plagioclase and clinopyroxene phenocrysts in historical lavas from Mt. Etna, Sicily, by laser ablation ICP-MS

The effects of the Mazama tephra-falls : a geoarchaeological approach

Basaltic volcanism and tectonics of the High Lava Plains, southeastern Oregon

New Insights into Mantle Dynamics from Helium Isotopes and Argon Geochronology

Interpreting geology in Yosemite National Park, California : a monument to strong granite, powerful glaciers, and the perseverance of life

Creating a Predictive Model of Cinder Cone Evolution in Central Oregon

Timescales and tectonics of oceanic plateaus : long-term evolution of Ontong Java Nui and Rio Grande Rise

Patterns and processes of sediment transport following sediment-filled dam removal in gravel bed rivers

Temporal and spatial variability of groundwater nitrate in the southern Willamette Valley of Oregon

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