Index Catalog // ScholarsArchive@OSU

Trace element characteristics of zircon : a means of assessing mineralization potential of intrusions in northern Nevada

Creator:: Farmer, Lucian P.
Abstract:: Oxidized hydrous intermediate composition magmas are responsible for porphyry copper (Cu ±Mo ±Au) deposits and epithermal Au ore deposits formed globally in the shallow crust (Sillitoe, 2010; Seedorff et al., 2005). Recently, zircon geochemistry has been used to characterize both productive and barren intrusions associated with porphyry Cu-Au ore deposits....
Resource Type:: Masters Thesis

Constructing a sheeted magmatic complex within the lower arc crust : insights from the Tenpeak pluton, North Cascades, Washington : Plate 1

Creator:: Chan, Christine F.
Abstract:: The sheeted complex of the ~92 Ma Tenpeak pluton, in the Northern Washington Cascades crystalline core, forms a <1.5-km wide zone with a moderate, NE-dip at the SW margin of the pluton. Sheeted magmatic complexes, such as the one in the Tenpeak pluton, are common in plutons and represent examples...
Resource Type:: Masters Thesis

Early high Cascade silicic volcanism : analysis of the McKenzie Canyon and Lower Bridge tuff

Creator:: Eungard, Daniel W.
Abstract:: Silicic volcanism in the central Oregon Cascade range has decreased in both the size and frequency of eruptions from its initiation at ~40 Ma to present. The reasons for this reduction in silicic volcanism are poorly constrained. Studies of the petrogenesis of these magmas have the potential for addressing this...
Resource Type:: Masters Thesis

Structural Evolution, Vein Orientation, and Paragenesis of the Botija Porphyry Cu-Mo-(Au) Deposit, Colón, Panamá

Creator:: Sepp, Michael D.
Abstract:: The Botija Cu-Mo-Au porphyry deposit is located in the Cobre Panamá mining district, which contains several deposits with a global measure and indicated and inferred resource of 14.8 MT of Cu. These deposits are associated with the Cerro Petaquilla batholith, which has U/Pb zircon ages of 26-33 Ma (Whattam et...
Resource Type:: Masters Thesis
Full Text:: the degree of Master of Science in Geology presented on July 13, 2016. Title: Structural

Reconstructing the Physical Record of a Four-Million-Year Volcanic System : Geochemistry, Thermobarometry, and Geologic Map of the Mount Jefferson Area, Oregon

Creator:: DiGiulio, Jennifer
Abstract:: Volcanic and sedimentary deposits of the Mount Jefferson area (MJA) record a fourmillion-year history of arc-related volcanism related to the subduction of the Juan de Fuca plate beneath North America. 171 mapped stratigraphic units over an area of 150 km² reveal four periods of volcanic activity resulting in diverse composition...
Resource Type:: Masters Thesis

The Geology and Geochemistry of the Haquira East Porphyry Copper Deposit of Southern Peru : Insights on the Timing, Temperature and Lifespan of the Magmatic-hydrothermal Alteration and Mineralization

Creator:: Cernuschi Rodilosso, Federico
Abstract:: This dissertation is informally divided into three major sections. In the first section (Chapter 2) I use data from field mapping, isotopic geochronology, whole rock geochemistry and trace element concentrations in zircons to examine the petrology, geochemistry and ages of the Haquira East porphyry copper deposit of southern Peru. In...
Resource Type:: Dissertation
Full Text:: ________________________________________________________________________ Dean of the College of Earth, Ocean, and Atmospheric Sciences

3D vs. conventional volcanic hazard maps : a user study at Mount Hood

Creator:: Preppernau, Charles A.
Abstract:: Volcanic hazard maps inform the public on the nature and extent of the hazards that threaten them, but these maps are often challenging for those who are not trained in map use or geology. The maps in this study focus on lahars, a dangerous, fast, and far-reaching volcanic hazard that...
Resource Type:: Masters Thesis
Full Text:: Master of Science in Geography presented on December 1, 2014 Title: 3D vs. Conventional Volcanic

Crustal architecture and magma dynamics in a large continental magmatic system : a case study of the Purico-Chascon Volcanic Complex, Northern Chile

Creator:: Burns, Dale H.
Abstract:: The ~1 Myr history of the Purico-Chascon volcanic complex (PCVC) records significant changes in the production and storage of magmas in the crust. At ~1 Ma activity at the PCVC initiated with the eruption of a large 80-100 km³ crystal-rich dacite ignimbrite with restricted whole rock ⁸⁷Sr/⁸⁶Sr isotope ratios between...
Resource Type:: Dissertation

Understanding large resurgent calderas and associated magma systems : the Pastos Grandes Caldera Complex, southwest Bolivia

Creator:: Kaiser, Jason Frederick, 1985-
Abstract:: The Pastos Grandes Caldera Complex (PGCC) in southwest Bolivia has produced two large-volume (≥800 km³ DRE) dacite ignimbrites from a nested caldera source over a period of 5.5 Myr. In addition to the large-volume ignimbrites, a small-volume ignimbrite shield and post-climactic lavas define this composite system. Based on detailed field...
Resource Type:: Dissertation
Full Text:: Geology Dean of the College of Earth, Ocean, and Atmospheric Sciences Dean of the

Volatile mobility of trace metals in volcanic systems

Creator:: Loewen, Matthew W.
Abstract:: Semi-volatile trace metals like Li, Cu, Mo, Sn, In, and Pb have the potential to track mobility of a volatile phase in volcanic systems. In this dissertation four studies are presented that either directly investigate or are motivated by observations of trace metal behavior in volcanic systems. A common tool...
Resource Type:: Dissertation
Full Text:: Dean of the College of Earth, Ocean, and Atmospheric Sciences Dean of the Graduate School I

Geochemical expression of volcanism in an on-axis and intraplate hotspot : Cobb and Marquesas

Creator:: Desonie, Dana L.
Abstract:: The Pacific Ocean basin is home to a set of hotspots diverse in their eruption rate, duration of volcanism, and basalt chemistry. Pacific hotspots are found in a spectrum of distinct plate tectonic settings, from near a spreading ridge to intraplate. Cobb hotspot, which resulted in formation of the Cobb-Eickelberg...
Resource Type:: Dissertation

The petrology, geochemistry, and geochronology of hotspot seamounts in the North Pacific and arc/backarc volcanism on the northern Antarctic Peninsula

Creator:: Keller, Randall A.
Abstract:: Volcanic rocks from hotspots and island arcs/backarcs typically have enriched trace element and isotopic compositions that contain a contribution from subducted oceanic crust. Isotopic and trace element data suggest that the enriched components in hotspot volcanism are ancient subducted sediment and crust, and the enriched components in arc/backarc volcanism are...
Resource Type:: Dissertation

Unstable jet flow along zonal ridge topography

Creator:: Witter, Donna Lynn
Abstract:: Motivated by observations of locally enhanced sea level variability near steep topographic slopes in regions of strong time-mean flows, effects of zonal ridge topography on zonal oceanic jet flow are investigated. Unstable wave properties and the dynamics of eddy-mean flow interaction are evaluated as a function of topographic geometry using...
Resource Type:: Dissertation

Diffuse deformation patterns along the North American plate boundary zone, offshore western United States

Creator:: Chaytor, Jason D.
Abstract:: Plate boundaries are commonly regions of complex, diffuse deformation with the motion across the boundary accommodated by numerous structural systems, rather than being narrow, discrete zones of deformation. One such boundary occurs where the North American plate makes contact with Juan de Fuca, Gorda, and Pacific plates along the west...
Resource Type:: Dissertation
Full Text:: Dean of the College of Oceanic & Atmospheric Sciences Dean of the Graduate School I

ScholarsArchive@OSU

Trace element characteristics of zircon : a means of assessing mineralization potential of intrusions in northern Nevada

Constructing a sheeted magmatic complex within the lower arc crust : insights from the Tenpeak pluton, North Cascades, Washington : Plate 1

Early high Cascade silicic volcanism : analysis of the McKenzie Canyon and Lower Bridge tuff

Structural Evolution, Vein Orientation, and Paragenesis of the Botija Porphyry Cu-Mo-(Au) Deposit, Colón, Panamá

Reconstructing the Physical Record of a Four-Million-Year Volcanic System : Geochemistry, Thermobarometry, and Geologic Map of the Mount Jefferson Area, Oregon

The Geology and Geochemistry of the Haquira East Porphyry Copper Deposit of Southern Peru : Insights on the Timing, Temperature and Lifespan of the Magmatic-hydrothermal Alteration and Mineralization

3D vs. conventional volcanic hazard maps : a user study at Mount Hood

Crustal architecture and magma dynamics in a large continental magmatic system : a case study of the Purico-Chascon Volcanic Complex, Northern Chile

Understanding large resurgent calderas and associated magma systems : the Pastos Grandes Caldera Complex, southwest Bolivia

Volatile mobility of trace metals in volcanic systems

Geochemical expression of volcanism in an on-axis and intraplate hotspot : Cobb and Marquesas

The petrology, geochemistry, and geochronology of hotspot seamounts in the North Pacific and arc/backarc volcanism on the northern Antarctic Peninsula

Unstable jet flow along zonal ridge topography

Diffuse deformation patterns along the North American plate boundary zone, offshore western United States

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