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- Amphibolite -- Montana -- Tobacco Root Mountains (1)
- Basalt -- Grande Ronde River Valley (Or. and Wash.) (1)
- Continental shelf -- Oregon (1)
- Geochemistry -- Oregon (1)
- Geology -- Grande Ronde River Valley (Or. and Wash.) (1)
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- Geology -- Montana -- Tobacco Root Mountains (1)
- Geology -- Oregon -- Bear Creek Butte Region (1)
- Hydrothermal deposits -- Oregon -- Bear Creek Butte Region (1)
- Metamorphism (Geology) -- Montana -- Tobacco Root Mountains (1)
- Metasomatism (Mineralogy) (1)
- Mineralogy -- Grande Ronde River Valley (Or. and Wash.) (1)
- Mineralogy -- Oregon (1)
- Mineralogy -- Oregon -- Bear Creek Butte Region (1)
- Oxide minerals -- Oregon (1)
- Radioactive waste disposal in the ground (1)
- Structural geology (1)
- Ultrabasic rocks -- Montana -- Tobacco Root Mountains (1)
Articles 1 - 4 of 4
Full-Text Articles in Geology
Mineralogy, Geochemistry, And Dispersal Of Opaque Oxides On The Continental Shelf Of The Cascadia Margin, Kommajosyula Subramanya Ravi
Mineralogy, Geochemistry, And Dispersal Of Opaque Oxides On The Continental Shelf Of The Cascadia Margin, Kommajosyula Subramanya Ravi
Dissertations and Theses
Opaque oxide minerals (ilmenite, chromite, and magnetite) in sands from the Oregon continental shelf have been studied to establish the provenance, dispersal, and grade of potential shelf placer deposits. The study area extends southward from offshore of the Columbia River in northern Oregon to the Klamath River in northern California.
Metasomatism Between Amphibolite And Metaultramafic Rocks During Upper Amphibolite Facies Metamorphism, Tobacco Root Mountains, Southwest Montana, William Robert Mcculloch
Metasomatism Between Amphibolite And Metaultramafic Rocks During Upper Amphibolite Facies Metamorphism, Tobacco Root Mountains, Southwest Montana, William Robert Mcculloch
Dissertations and Theses
The purpose of this study is to characterize the metasomatism that has taken place as a result of the chemical incompatibility between mafic and metaultramafic bulk compositions during high-grade regional metamorphism in the Tobacco Root Mountains, southwest Montana. Metasomatism of these rocks took place by both diffusionand infiltration-dominated processes. The result of these processes are characterized mineralogically and geochemically in the rocks.
Textural And Mineralogical Characteristics Of Altered Grande Ronde Basalt, Northeastern Oregon : A Natural Analog For A Nuclear Waste Repository In Basalt, Paul M. Trone
Dissertations and Theses
Altered flows that are low-MgO chemical types of the Grande Ronde Basalt crop out in the steep walls of the Grande Ronde River canyon near Troy, Wallowa County, Oregon. The alteration effects in these flows are being investigated as a natural analog system to a high level nuclear waste repository in basalt. The flows within the study are referred to as the analog flow, in which the alteration effects are the strongest, and the superjacent flow. The analog flow crops out at Grande Ronde River level and a roadcut-outcrop is developed in the flow-top breccia of this flow. The two …
The Geology And Hydrothermal Alteration Of The Bear Creek Butte Area, Crook County, Central Oregon, Richard Matthew Wilkening
The Geology And Hydrothermal Alteration Of The Bear Creek Butte Area, Crook County, Central Oregon, Richard Matthew Wilkening
Dissertations and Theses
The Eocene Clarno Formation, the Oligocene John Day Formation and basalts of the High Lava Plains are exposed in the Bear Creek Butte area in Central Oregon. In this area the Clarno Formation can be divided into a lower sequence composed of intermediate lava flows with intercalated mudflows and volcaniclastic sediments and an upper sequence of rhyolite and basalt flows and felsic ruffs. Separating the two units is a well developed saprolite. The change from intermediate to rhyolite-basalt volcanism reflects a change in the tectonic environment of the Cascade volcanic arc from compression to relaxation as subduction of the Farallon …