Index Catalog // ScholarsArchive@OSU

Rhyolitic magmatism of the High Lava Plains and adjacent Northwest Basin and Range, Oregon : implications for the evolution of continental crust

Creator:: Ford, Mark T.
Abstract:: Understanding continental crust formation and modification is a fundamental and longstanding geologic problem. Influx of mantle-derived basaltic magma and partial melting of the crust are two ways to drive crustal differentiation. This process results in a low density upper crust and denser, more refractory lower crust, creating significant and vastly...
Resource Type:: Dissertation

Thin-skinned tectonics on continent/ocean transitional crust, Sulaiman Range, Pakistan

Creator:: Jadoon, Ishtiaq Ahmad Khan
Abstract:: Surface and subsurface data from the Sulaiman thrust belt show that nearly all the 10 km thick sequence of dominantly platform (>7 km) and molasse strata is detached at the deformation front. These strata thicken tectonically to a minimum of 20 km in the hinterland of the Sulaiman fold belt...
Resource Type:: Dissertation
Full Text:: crust, Sulaiman Range, Pakistan AN ABSTRACT OF THE THESIS OF Ishtiaq Ahmad Khan Jadoon for the degree

Changes in gravity anomalies during erosion and isostatic rebound of collisional mountain ranges

Creator:: Enos, Robert A.
Abstract:: At collisional mountain ranges the tectonic history of crustal shortening and subsequent post-collisional erosion is preserved in the form of the presently observed gravity anomalies. In this study, models of erosion and isostatic rebound at various stages of collision illustrate the evolution of crustal structure, topography, and resulting gravity anomalies....
Resource Type:: Masters Thesis
Full Text:: continental margin prior to collision, including thin transitional and oceanic crust. At more advances

The Gorda Escarpment's rise and fall : synthesis of exploration seismology, sampling efforts, micropaleontology, and radiometric dating

Creator:: Potter, Susan M.
Abstract:: The Gorda Escarpment (40.4° N and from 126° W to 124.7° W) is a topographic high which is the eastern portion of the Mendocino Transform Fault. The Vizcaino Block is the anomalously shallow portion of the Pacific plate immediately south of the Gorda Escarpment. Sediments of the Vizcaino Block record...
Resource Type:: Masters Thesis
Full Text:: AN ABSTRACT OF THE THESIS OF Susan M. Potter for the degree of

Soil erosion and vegetation loss accelerated by visitor use of Paradise Meadows, Mount Rainier National Park

Creator:: Fritzke, Susan L.
Abstract:: Recreational impacts on the subalpine-alpine ecosystems of Mount Rainier National Park have developed over the past century, and today pose a major problem for park managers. Field data were collected during the summer of 1987 in the Paradise meadows area in order to describe visitor impacts on social trails (trails...
Resource Type:: Masters Thesis

Structure of the crust beneath Lake Superior from forward modeling of large aperture seismic data

Creator:: Shay, John T.
Abstract:: Both travel times and amplitudes of large offset refracted and reflected arrivals observed during GLIMPCE (Great Lakes International Multidisciplinary Program on Crustal Evolution) along line A in Lake Superior have been modeled using two-dimensional ray tracing techniques. Forward modeling was used to iteratively refine an initial velocity model that was...
Resource Type:: Masters Thesis
Full Text:: Structure of the crust beneath Lake Superior from forward

Deep crustal and mantle inputs to North Sister Volcano, Oregon High Cascade Range

Creator:: Schmidt, Mariek E.
Abstract:: The Central Oregon High Cascade Range is an anomalously mafic segment of the Cascade Arc due to ongoing intra-arc extension, which allows most magmas to traverse the crust without stalling and evolving to more evolved compositions. North Sister, a composite volcano in this arc segment, has produced a seemingly monotonous...
Resource Type:: Dissertation

Constraining the magmatic evolution of the Andean arc at 21⁰S using the volcanic and petrologic history of Volćán Aucanquilcha, Central Volcanic Zone, northern Chile

Creator:: Klemetti, Erik W.
Abstract:: Volcan Aucanquilcha, a Pleistocene to Recent composite volcano in northern Chile, is the youngest and center-most member of the 11 m.y.-old Aucanquilcha Volcanic Cluster (AVC). The AVC has produced [approximately]350 km³ of lava over its history. Magmatism started slowly and was punctuated by high rates of eruption between 4.5 and...
Resource Type:: Dissertation

Dynamics of a long-lived magmatic system as indicated by variations in amphibole composition and textures in dacites erupted over 11 M.y. at the Aucanquilcha Volcanic Cluster, Central Andes, Chile

Creator:: Giles, Denise E. L.
Abstract:: The Aucanquilcha Volcanic Cluster (AVC) is the erupted part of a magmatic system with a complex and long-lived history. The AVC lies at 21°S in the high Andes and is built on thick continental crust. The thick crust in the area combined with the prolonged magmatic activity make it an...
Resource Type:: Masters Thesis

Magma dynamics and evolution in continental arcs : insights from the Central Andes

Creator:: Grocke, Stephanie B.
Abstract:: Constraining the magma evolution and dynamics that lead to the eruption of large volume continental arc systems is fundamental to our understanding of continental crust formation. An investigation into the magmagenesis that results in the formation of the Central Volcanic Zone (CVZ) in the Andes of South America, situated atop...
Resource Type:: Dissertation
Full Text:: from the Central Andes. Abstract approved: Shanaka L. de Silva Constraining the magma evolution

ScholarsArchive@OSU

Rhyolitic magmatism of the High Lava Plains and adjacent Northwest Basin and Range, Oregon : implications for the evolution of continental crust

Thin-skinned tectonics on continent/ocean transitional crust, Sulaiman Range, Pakistan

Changes in gravity anomalies during erosion and isostatic rebound of collisional mountain ranges

The Gorda Escarpment's rise and fall : synthesis of exploration seismology, sampling efforts, micropaleontology, and radiometric dating

Soil erosion and vegetation loss accelerated by visitor use of Paradise Meadows, Mount Rainier National Park

Structure of the crust beneath Lake Superior from forward modeling of large aperture seismic data

Deep crustal and mantle inputs to North Sister Volcano, Oregon High Cascade Range

Constraining the magmatic evolution of the Andean arc at 21⁰S using the volcanic and petrologic history of Volćán Aucanquilcha, Central Volcanic Zone, northern Chile

Dynamics of a long-lived magmatic system as indicated by variations in amphibole composition and textures in dacites erupted over 11 M.y. at the Aucanquilcha Volcanic Cluster, Central Andes, Chile

Magma dynamics and evolution in continental arcs : insights from the Central Andes

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