Index Catalog // ScholarsArchive@OSU

Genesis of the El Salvador porphyry copper deposit, Chile and distribution of epithermal alteration at Lassen Peak, California

Creator:: Lee, Robert G. (Robert George)
Abstract:: The El Salvador porphyry copper deposit in the Indio Muerto district of northern Chile has been geologically investigated for more than 60 years and provides one of the best bases for understanding similar environments of ore formation elsewhere in the world. Fourteen new zircon U/Pb isotopic ages obtained via in...
Resource Type:: Dissertation
Full Text:: Oregon State University. My committee members Adam J.R. Kent, Frank J. Tepley III, Anita L. Grunder

Extension and volcanism : tectonic development of the northwestern margin of the Basin and Range Province in southern Oregon

Creator:: Scarberry, Kaleb C.
Abstract:: The northwestern corner of the Basin and Range Province (NWBR) lies in southeast Oregon where extensive Late Miocene, mafic to bimodal basalt-rhyolite volcanism and extensional faults dominate a stark and arid landscape. Near Lake Abert, the Late Miocene volcanic section abuts Early Miocene, dominantly intermediate composition volcanoes at the Coleman...
Resource Type:: Dissertation
Full Text:: 22, 2007 Commencement June 2008 ACKNOWLEDGMENTS I would like to thank Anita Grunder

Volcanology and petrology of the Rattlesnake Ash-Flow Tuff, eastern Oregon

Creator:: Streck, Martin J.
Abstract:: The Rattlesnake Ash-Flow Tuff erupted 7.05±0.01 Ma from the western Harney Basin, southeastern Oregon. The location of the vent area is inferred based on vent-ward increases in size of pumices, in degree of welding, and in degree of post-emplacement crystallization. Today's outcrops cover 9000 km2 and estimated original outcrop coverage...
Resource Type:: Dissertation
Full Text:: of the Rattlesnake Ash-Flow Tuff, Eastern Oregon. Abstract approved: Anita L. Grun r The

The geochemical evolution of the Aucanquilcha Volcanic Cluster : prolonged magmatism and its crustal consequences

Creator:: Walker, Barry Alan, Jr.
Abstract:: The interaction of magma with continental crust at convergent margins is fundamental to understanding if and how continents grow. Isotopic and elemental data constrain the progressive stages of development of the magmatic underpinnings of the long-lived Aucanquilcha Volcanic Cluster (AVC), situated atop the thick continental crust of the central Andes...
Resource Type:: Dissertation

Feeder dikes to the Columbia River flood basalts : underpinnings of a large igneous province

Creator:: Petcovic, Heather L.
Abstract:: Feeder dikes to the Columbia River Basalt Group (CRBG) large igneous province provide a rare opportunity to examine magma transport through the shallow crust during flood basalt eruptions. Over 70% of the CRBG erupted from the Chief Joseph dike swarm, which is exposed across southeastern Washington, eastern Oregon, and western...
Resource Type:: Dissertation

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:: , Anita Grunder. She has always been there for me and my family, and has become a great friend as well

The Nature of Sulfate Saturation in Oxidized Arc Magmas: Implications for Magmatic Sulfur Budgets

Creator:: Hutchinson, Michael C.
Abstract:: This dissertation is concerned with the behavior of sulfur in intermediate-silicic arc magmas associated with subduction at convergent margins. In particular it focusses on oxidized, sulfur-rich magmas, the conditions at which they might reach sulfate saturation, and implications of sulfate saturation. It is divided into an investigation of natural samples...
Resource Type:: Dissertation
Full Text:: study geology. This includes committee members Anita Grunder, Frank Tepley III, Roger Neilsen and Adam

Evolution of volcanism and hydrothermal activity in the Yanacocha Mining District, northern Perú

Creator:: Longo, Anthony A.
Abstract:: The Yanacocha Mining District in northern Perú is considered the largest group of high-sulfidation style epithermal gold deposits in the world. District-scale geologic mapping coupled with detailed 40Ar/39Ar geochronology, geochemistry and petrography establish the volcanic history of the area and analyze the temporal and spatial evolution of volcanism, hypogene advanced...
Resource Type:: Dissertation

Petrology of the reversely zoned Mickey Pass Tuff, west-central Nevada

Creator:: Templeton, Jeffrey H.
Resource Type:: Dissertation
Full Text:: Tuff, West- central Nevada. Abstract approved: Anita L. Grunder The 27.0-Ma Mickey Pass Tuff

What lies Beneath? Origin and Transition from the Shallow Epithermal Au-Ag Lithocap to Deeper Porphyry Cu Environment: Insights from the Magmatic Hydrothermal Deposits at Yerington, Nevada, and Summitville, Colorado

Creator:: Sepp, Michael D.
Abstract:: Near-surface advanced argillic hydrothermal alteration zones, also referred to as lithocaps, are characterized by quartz, alunite, clays (pyrophyllite and kaolinite group minerals), and minor F-bearing aluminosilicates (i.e., topaz, zunyite, diaspore, and APS) that form where water-, SO2-, and HF-rich gas condenses into shallow groundwater, acidifies, and reacts with rocks. The...
Resource Type:: Dissertation
Full Text:: , Anita Grunder, Frank Tepley III, Anthony Harris, and Rene Reitsma. I would also like to thank Newcrest

ScholarsArchive@OSU

Genesis of the El Salvador porphyry copper deposit, Chile and distribution of epithermal alteration at Lassen Peak, California

Extension and volcanism : tectonic development of the northwestern margin of the Basin and Range Province in southern Oregon

Volcanology and petrology of the Rattlesnake Ash-Flow Tuff, eastern Oregon

The geochemical evolution of the Aucanquilcha Volcanic Cluster : prolonged magmatism and its crustal consequences

Feeder dikes to the Columbia River flood basalts : underpinnings of a large igneous province

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

The Nature of Sulfate Saturation in Oxidized Arc Magmas: Implications for Magmatic Sulfur Budgets

Evolution of volcanism and hydrothermal activity in the Yanacocha Mining District, northern Perú

Petrology of the reversely zoned Mickey Pass Tuff, west-central Nevada

What lies Beneath? Origin and Transition from the Shallow Epithermal Au-Ag Lithocap to Deeper Porphyry Cu Environment: Insights from the Magmatic Hydrothermal Deposits at Yerington, Nevada, and Summitville, Colorado

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