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Geology and petrologic evolution of the silicic to intermediate volcanic rocks underneath Steens Mountain basalt, SE Oregon

Creator:: Langer, Vera W.
Abstract:: Steens Mountain in SE Oregon is part of the northern Basin and Range Province, and represents a horst tilted about 100 to the west that is bounded to the east by a high angle, NNE trending normal fault. The minimum displacement is about 1200 m. Volcanic rocks, exposed along the...
Resource Type:: Masters Thesis

Petrogenesis of the Steens Basalt : Variation in Source Contributions and Effects of Crustal Passage During the Onset of Columbia River Flood Basalt Volcanism

Creator:: Moore, Nicole E.
Abstract:: Continental flood basalts represent short-lived but immense blasts of mafic magma to the continental crust. The youngest and smallest continental flood basalt worldwide, the Columbia River Basalt, initiated with the eruption of the most mafic member, the Steens Basalt (~16.9 Ma). The Steens Basalt is exposed in southeast Oregon, southwest...
Resource Type:: Dataset and Dissertation
Full Text:: Steens Mountain, with eruptions spanning no more than a few 100,000 years. The Steens Basalt has been

The volcanic stratigraphy of the Mickey Hot Springs area, Harney County, Oregon

Creator:: Hook, Richard
Abstract:: Steens Mountain is a major horst block near the northern terminus of the Basin and Range geomorphic province of southeastern Oregon. A section of Miocene volcanic rocks totaling 5000 feet in thickness are exposed in a fault escarpment on the eastern side of Steens Nountain. These include: the Pike Creek...
Resource Type:: Masters Thesis

The structure and stratigraphy of a portion of the Trout Creek Mountains, Harney County, Oregon

Creator:: Carlton, Richard W.
Abstract:: The thesis area is located in the southeastern corner of Harney County, Oregon. This portion of Oregon is situated in the northern part of the Basin and Range province, and is characterized by both mafic and silicic extrusives, and localized nonmarine sediments and tuffs ranging in age from middle (?)...
Resource Type:: Masters Thesis

Geology and geochemistry of Juniper Ridge, Horsehead Mountain and Burns Butte : implications for the petrogenesis of silicic magma on the High Lava Plains, southeastern Oregon

Creator:: MacLean, James W.
Abstract:: The Juniper Ridge volcanic complex is located in the High Lava Plains Province of southeastern Oregon, a wide zone of bimodal volcanism and faulting that marks the northern limit of widespread Basin and Range-style faulting in the northern Great Basin Province. Rhyolite dome complexes are progressively younger to the northwest...
Resource Type:: Masters Thesis

Geology of the Greenhorn Mountains, northeastern Oregon

Creator:: Mullen, Ellen Domaratius
Abstract:: The Greenhorn Mountains contain a tectonic ally disrupted ophiolite and both arc-derived and pelagic sediments. Age of major sedimentary units within and bordering the thesis area is Early Permian, based upon dates of conodonts and fusulinids from contemporaneous but allocthanous limestones. Sediments near the south boundary of the thesis area...
Resource Type:: Masters Thesis

Geology of part of the southeastern Wallowa Mountains, northeastern Oregon

Creator:: Wetherell, Clyde Elbert
Abstract:: Within 40 square miles of the southeastern Wallowa Mountains, Oregon, eugeosynclinal Permian and Triassic formations comprising a section about 25,000 feet thick have been exposed by uplift and erosion of overlying Miocene Columbia River basalt. Deposition appears to have been continuous from Permian into Upper Triassic, but an apparent angular...
Resource Type:: Masters Thesis

Petrography of pre-Tertiary rocks of the Blue Mountains, Umatilla County, northeast Oregon

Creator:: Trauba, William Charles
Abstract:: Nine small Mesozoic plutons in TJmatilla County, northeast Oregon, crop out within an area of 58 sq km in the Blue Mountains. The plutons are divided into an earlier series of probable Permian-Triassic age and a later intrusive series of probable Late Jurassic to Middle Cretaceous age. The earlier rocks...
Resource Type:: Masters Thesis

Geology of the Bachelor Mountain area, Linn and Marion Counties, Oregon

Creator:: Rollins, Anthony
Resource Type:: Masters Thesis

The statigraphy, structure, and petrography of Keyes Mountain, tertiary upper Clarno formation, Wheeler County, Oregon

Creator:: Cranswick, Mark Scott
Resource Type:: Masters Thesis

ScholarsArchive@OSU

Geology and petrologic evolution of the silicic to intermediate volcanic rocks underneath Steens Mountain basalt, SE Oregon

Petrogenesis of the Steens Basalt : Variation in Source Contributions and Effects of Crustal Passage During the Onset of Columbia River Flood Basalt Volcanism

The volcanic stratigraphy of the Mickey Hot Springs area, Harney County, Oregon

The structure and stratigraphy of a portion of the Trout Creek Mountains, Harney County, Oregon

Geology and geochemistry of Juniper Ridge, Horsehead Mountain and Burns Butte : implications for the petrogenesis of silicic magma on the High Lava Plains, southeastern Oregon

Geology of the Greenhorn Mountains, northeastern Oregon

Geology of part of the southeastern Wallowa Mountains, northeastern Oregon

Petrography of pre-Tertiary rocks of the Blue Mountains, Umatilla County, northeast Oregon

Geology of the Bachelor Mountain area, Linn and Marion Counties, Oregon

The statigraphy, structure, and petrography of Keyes Mountain, tertiary upper Clarno formation, Wheeler County, Oregon

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