Index Catalog // ScholarsArchive@OSU

The Deschutes Formation: evidence of extension-enhanced explosivity in the early High Cascades

Creator:: Pitcher, Bradley W.
Abstract:: The eruptive history of the Quaternary Cascades arc has been relatively well characterized. However, much less is known about the frequency and sizes of explosive eruptions produced by earlier stages of the arc. The Late Neogene Deschutes Formation of Central Oregon preserves a remarkable record of heightened pyroclastic activity during...
Resource Type:: Dissertation
Full Text:: Deschutes Formation: Evidence of Extension-Enhanced Explosivity in the Early High Cascades

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:: formation of NW-striking fault systems. Extension and Volcanism: Tectonic Development of the

Evolution of jasperoid and hydrothermal alteration at Veteran Extension in the Robinson (Ely) porphyry copper district, Nevada

Creator:: Maher, David J., (David Joseph), 1969-
Resource Type:: Masters Thesis
Full Text:: Extension in the Robinson (Ely) porphyry copper district, Nevada AN ABSTRACT OF THE THESIS OF David J

The termination of the Basin and Range Province into a clockwise rotating region of transtension and volcanism, central Oregon

Creator:: Trench, David
Abstract:: Normal faults characterizing extensional provinces may terminate along-strike at regions of zero extension, at zones of transform faults, or at triple junctions. Termination of the Basin and Range extensional province in southeastern Oregon is thought to occur by right-lateral transform motion distributed across the Brothers Fault zone (BFZ) in central...
Resource Type:: Masters Thesis
Full Text:: zero extension, at zones of transform faults, or at triple junctions. Termination of the Basin and

Structure and seismic hazards of the offshore Cascadia forearc and evolution of the Neogene forearc basin

Creator:: McNeill, Lisa C.
Abstract:: The Cascadia subduction zone has been characterized as a typical Chilean-type subduction zone based on qualitative comparisons of plate age and convergence rate, with simple forearc structure. However, the discovery of unusual structural styles of deformation, variations in the morphology of the forearc, and its absence of seismic activity suggest...
Resource Type:: Dissertation
Full Text:: shelf and upper slope are characterized by extension in the form of listric normal faults. These faults

Alkaline and peraluminous intrusives in the Clarno Formation around Mitchell, Oregon : ramifications on magma genesis and subduction tectonics

Creator:: Appel, Michael
Abstract:: The Clarno Formation is a series of volcanic, volcaniclastic, and related intrusive rocks located in central Oregon. It is the westernmost extent of a broader Eocene magmatic belt that covers much the western United States. The magmatic belt stretches eastward from Oregon to western South Dakota, and from the Canadian...
Resource Type:: Masters Thesis
Full Text:: involving extension was in place during the early Cenozoic. In the vicinity of Mitchell, Oregon, the Clarno

Interpreting a weird and scenic landscape to park visitors : tectonic and volcanic processes of Craters of the Moon National Monument and Preserve, Idaho

Creator:: Truitt, Kimberly E.
Abstract:: This thesis develops a geology training manual for the Interpretation staff of Craters of the Moon National Monument and Preserve (CRMO) in southern Idaho. The manual will help the staff convey geologic principles to park visitors who are experiencing a landscape formed by volcanic processes. Basic geology and the most...
Resource Type:: Masters Thesis
Full Text:: giving the interpretive staff a clearer picture of the similarity of Basin and Range extension to the

Two-stage opening of the northwestern basin and range in eastern Oregon : evidence from the Miocene Crane basin

Creator:: Milliard, Justin B.
Abstract:: New data are presented that provide evidence for the onset of extensional deformation in the Northwestern Basin and Range within 1 million years after the eruption of the Steens Basalt at 16.5 Ma. New geologic mapping (1:24,000), stratigraphic sections, and ⁴⁰Ar/³⁹Ar dating of the Crane Basin rocks provide a control...
Resource Type:: Masters Thesis
Full Text:: history of the basin. Extension‐related horst and graben formation began at 15.5 Ma and continued until

Early Oligocene intrusions in the central Coast Range of Oregon : petrography, geochemistry, geochronology and implications for the Tertiary magmatic evolution of the Cascadia forearc

Creator:: Oxford, Jeremiah
Abstract:: The Early Oligocene Oregon Coast Range Intrusions (OCRI) consist of gabbroic rocks and lesser alkalic intrusive bodies that were emplaced in marine sedimentary units and volcanic sequences within a Tertiary Cascadia forearc basin. The alkalic intrusions include nepheline syenite, camptonite, and alkaline basalt. The gabbros occur as dikes and differentiated...
Resource Type:: Masters Thesis
Full Text:: America continental margin. Dextral shear and extension along the continental margin may have been a

Basaltic volcanism and tectonics of the High Lava Plains, southeastern Oregon

Creator:: Jordan, Brennan T.
Abstract:: The High Lava Plains province (HLP) of southeastern Oregon is a Miocene to Recent volcanic upland characterized by widespread basaltic volcanism and west-migrating rhyolitic volcanism. New ⁴⁰Ar/³⁹Ar ages for HLP rhyolites demonstrate that the trend of migrating rhyolitic volcanism is robust, reflecting westward migration at a rate of -35 km/m.y....
Resource Type:: Dissertation
Full Text:: ............................................................... 11 Evolving Back Arc Extension ........................................................ 14

ScholarsArchive@OSU

The Deschutes Formation: evidence of extension-enhanced explosivity in the early High Cascades

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

Evolution of jasperoid and hydrothermal alteration at Veteran Extension in the Robinson (Ely) porphyry copper district, Nevada

The termination of the Basin and Range Province into a clockwise rotating region of transtension and volcanism, central Oregon

Structure and seismic hazards of the offshore Cascadia forearc and evolution of the Neogene forearc basin

Alkaline and peraluminous intrusives in the Clarno Formation around Mitchell, Oregon : ramifications on magma genesis and subduction tectonics

Interpreting a weird and scenic landscape to park visitors : tectonic and volcanic processes of Craters of the Moon National Monument and Preserve, Idaho

Two-stage opening of the northwestern basin and range in eastern Oregon : evidence from the Miocene Crane basin

Early Oligocene intrusions in the central Coast Range of Oregon : petrography, geochemistry, geochronology and implications for the Tertiary magmatic evolution of the Cascadia forearc

Basaltic volcanism and tectonics of the High Lava Plains, southeastern Oregon

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