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Academic literature on the topic 'Volcanoes – Oregon'

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Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Volcanoes – Oregon"

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Nichols, M. L., S. D. Malone, S. C. Moran, W. A. Thelen, and J. E. Vidale. "Deep long-period earthquakes beneath Washington and Oregon volcanoes." Journal of Volcanology and Geothermal Research 200, no. 3-4 (March 2011): 116–28. http://dx.doi.org/10.1016/j.jvolgeores.2010.12.005.

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Barnes, Calvin G. "Petrology of monogenetic volcanoes, Mount Bailey area, Cascade Range, Oregon." Journal of Volcanology and Geothermal Research 52, no. 1-3 (September 1992): 141–56. http://dx.doi.org/10.1016/0377-0273(92)90137-3.

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Schmidt, Mariek E., and Anita L. Grunder. "Deep Mafic Roots to Arc Volcanoes: Mafic Recharge and Differentiation of Basaltic Andesite at North Sister Volcano, Oregon Cascades." Journal of Petrology 52, no. 3 (February 2, 2011): 603–41. http://dx.doi.org/10.1093/petrology/egq094.

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BACON, CHARLES R. "Calc-alkaline, Shoshonitic, and Primitive Tholeiitic Lavas from Monogenetic Volcanoes near Crater Lake, Oregon." Journal of Petrology 31, no. 1 (February 1, 1990): 135–66. http://dx.doi.org/10.1093/petrology/31.1.135.

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Koleszar, Alison M., Adam J. R. Kent, Paul J. Wallace, and William E. Scott. "Controls on long-term low explosivity at andesitic arc volcanoes: Insights from Mount Hood, Oregon." Journal of Volcanology and Geothermal Research 219-220 (March 2012): 1–14. http://dx.doi.org/10.1016/j.jvolgeores.2012.01.003.

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Brophy, J. G., and S. T. Dreher. "The origin of composition gaps at South Sister volcano, central Oregon: implications for fractional crystallization processes beneath active calc-alkaline volcanoes." Journal of Volcanology and Geothermal Research 102, no. 3-4 (November 2000): 287–307. http://dx.doi.org/10.1016/s0377-0273(00)00192-x.

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Driedger, C. L., and P. M. Kennard. "Glacier Volume Estimation on Cascade Volcanoes: An Analysis and Comparison with Other Methods." Annals of Glaciology 8 (1986): 59–64. http://dx.doi.org/10.3189/s0260305500001142.

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During the 1980 eruption of Mount St. Helens, the occurrence of floods and mudflows made apparent a need to assess mudflow hazards on other Cascade volcanoes. A basic requirement for such analysis is information about the volume and distribution of snow and ice on these volcanoes.An analysis was made of the volume-estimation methods developed by previous authors and a volume- estimation method was developed for use in the Cascade Range. A radio echo-sounder, carried in a backpack, was used to make point measurements of ice thickness on major glaciers of four Cascade volcanoes (Mount Rainier, Washington; Mount Hood and the Three Sisters, Oregon; and Mount Shasta, California), These data were used to generate ice-thickness maps and bedrock topographic maps for developing and testing volume-estimation methods. Subsequently, the methods were applied to the unmeasured glaciers on those mountains and, as a test of the geographical extent of applicability, to glaciers beyond the Cascades having measured volumes.Two empirical relationships were required in order to predict volumes for all the glaciers. Generally, for glaciers less than 2.6 km in length, volume was found to be estimated best by using glacier area, raised to a power. For longer glaciers, volume was found to be estimated best by using a power law relationship, including slope and shear stress. The necessary variables can be estimated from topographic maps and aerial photographs.
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Driedger, C. L., and P. M. Kennard. "Glacier Volume Estimation on Cascade Volcanoes: An Analysis and Comparison with Other Methods." Annals of Glaciology 8 (1986): 59–64. http://dx.doi.org/10.1017/s0260305500001142.

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During the 1980 eruption of Mount St. Helens, the occurrence of floods and mudflows made apparent a need to assess mudflow hazards on other Cascade volcanoes. A basic requirement for such analysis is information about the volume and distribution of snow and ice on these volcanoes.An analysis was made of the volume-estimation methods developed by previous authors and a volume- estimation method was developed for use in the Cascade Range. A radio echo-sounder, carried in a backpack, was used to make point measurements of ice thickness on major glaciers of four Cascade volcanoes (Mount Rainier, Washington; Mount Hood and the Three Sisters, Oregon; and Mount Shasta, California), These data were used to generate ice-thickness maps and bedrock topographic maps for developing and testing volume-estimation methods. Subsequently, the methods were applied to the unmeasured glaciers on those mountains and, as a test of the geographical extent of applicability, to glaciers beyond the Cascades having measured volumes.Two empirical relationships were required in order to predict volumes for all the glaciers. Generally, for glaciers less than 2.6 km in length, volume was found to be estimated best by using glacier area, raised to a power. For longer glaciers, volume was found to be estimated best by using a power law relationship, including slope and shear stress. The necessary variables can be estimated from topographic maps and aerial photographs.
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Bacon, Charles R., and Joel E. Robinson. "Postglacial faulting near Crater Lake, Oregon, and its possible association with the Mazama caldera-forming eruption." GSA Bulletin 131, no. 9-10 (February 14, 2019): 1440–58. http://dx.doi.org/10.1130/b35013.1.

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Abstract Volcanoes of subduction-related magmatic arcs occur in a variety of crustal tectonic regimes, including where active faults indicate arc-normal extension. The Cascades arc volcano Mount Mazama overlaps on its west an ∼10-km-wide zone of ∼north-south–trending normal faults. A lidar (light detection and ranging) survey of Crater Lake National Park, reveals several previously unrecognized faults west of the caldera. Postglacial vertical separations measured from profiles across scarps range from ∼2 m to as much as 12 m. Scarp profiles commonly suggest two or more postglacial surface-rupturing events. Ignimbrite of the ca. 7.6 ka climactic eruption of Mount Mazama, during which Crater Lake caldera formed, appears to bury fault strands where they project into thick, valley-filling ignimbrite. Lack of lateral offset of linear features suggests principally normal displacement, although predominant left stepping of scarp strands implies a component of dextral slip. West-northwest–east-southeast and north-northwest–south-southeast linear topographic elements, such as low scarps or ridges, shallow troughs, and straight reaches of streams, suggest that erosion was influenced by distributed shear, consistent with GPS vectors and clockwise rotation of the Oregon forearc block. Surface rupture lengths (SRL) of faults suggest earthquakes of (moment magnitude) Mw6.5 from empirical scaling relationships. If several faults slipped in one event, a combined SRL of 44 km suggests an earthquake of Mw7.0. Postglacial scarps as high as 12 m imply maximum vertical slip rates of 1.5 mm/yr for the zone west of Crater Lake, considerably higher than the ∼0.3 mm/yr long-term rate for the nearby West Klamath Lake fault zone. An unanswered question is the timing of surface-rupturing earthquakes relative to the Mazama climactic eruption. The eruption may have been preceded by a large earthquake. Alternatively, large surface-rupturing earthquakes may have occurred during the eruption, a result of decrease in east-west compressive stress during ejection of ∼50 km3 of magma and concurrent caldera collapse.
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Marcott, Shaun A., Andrew G. Fountain, Jim E. O'Connor, Peter J. Sniffen, and David P. Dethier. "A latest Pleistocene and Holocene glacial history and paleoclimate reconstruction at Three Sisters and Broken Top Volcanoes, Oregon, U.S.A." Quaternary Research 71, no. 2 (March 2009): 181–89. http://dx.doi.org/10.1016/j.yqres.2008.09.002.

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AbstractAt least three sets of moraines mark distinct glacial stands since the last glacial maximum (LGM) in the Three Sisters region of the Oregon Cascade Range. The oldest stand predates 8.1 ka (defined here as post-LGM), followed by a second between ∼ 2 and 8 ka (Neoglacial) and a third from the Little Ice Age (LIA) advance of the last 300 years. The post-LGM equilibrium line altitudes were 260 ± 100 m lower than that of modern glaciers, requiring 23 ± 9% increased winter snowfall and 1.4 ± 0.5°C cooler summer temperatures than at present. The LIA advance had equilibrium line altitudes 110 ± 40 m lower than at present, implying 10 ± 4% greater winter snowfall and 0.6 ± 0.2°C cooler summer temperatures.
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Dissertations / Theses on the topic "Volcanoes – Oregon"

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Beachly, Matthew William 1986. "The Upper Crustal P-wave Velocity Structure of Newberry Volcano, Central Oregon." Thesis, University of Oregon, 2011. http://hdl.handle.net/1794/11475.

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xii, 98 p. : ill. (some col.)
The upper-crustal seismic-velocity structure of Newberry volcano, central Oregon, is imaged using P-wave travel time tomography. The inversion combines a densely-spaced seismic line collected in 2008 with two USGS seismic experiments from the 1980s. A high-velocity ring (7 km EW by 5 km NS) beneath the inner caldera faults suggests an intrusive ring complex 200 to 500 m thick. Within this ring shallow low velocities (<2 km depth) are interpreted as caldera fill and a subsided block. High velocities below 2 km depth could be intrusive complexes. There appears to be a low-velocity body at 3-6 km depth beneath the center of the volcano. This region is poorly resolved in the inversion because the ray paths bend around the low-velocity body. The 2008 data also recorded a secondary arrival that may be a delayed P-wave interacting with the low-velocity body.
Committee in charge: Emilie E.E. Hooft, Chairperson; Douglas R. Toomey, Member; Katharine V. Cashman, Member
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Ohlschlager, Justin George. "Glacier Change on the Three Sisters Volcanoes, Oregon: 1900-2010." PDXScholar, 2015. https://pdxscholar.library.pdx.edu/open_access_etds/2448.

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A glacier responds to changes in climate by subsequent retreat and advance as a result of changes in snow inputs and outputs. Understanding these changes is important because shrinking glaciers limit and diminish local water resources. They contribute to alpine runoff in the late-summer months by delaying the maximum runoff until late in the melt season. A comprehensive glacier and perennial snowfield inventory has not been completed for the Three Sisters in Central Oregon. Using aerial photography, Digital Elevation Models (DEMs), previous studies, and historical ground based photographs these glacier and perennial snowfields were defined and their surface area change was quantified along with surface area and volume change for the 15 named glaciers for multiple years. The glaciers and perennial snowfields totaled 9.03 ± 1.65 km2 in 1949 and decreased to 7.1 ± 1.16 km2 in 2003 giving a total loss of -1.914 ± 0.974 km2 ( 21%). The 15 named glaciers totaled 12.43 ± 0.417 km2 in ~1900 and decreased to 5.65 ± 0.135 km2 in 2003 giving a total loss of -6.70 ± 0.439 km2 (54%) with more loss occurring in the early part of the century. It's estimated that the 15 named glaciers lost roughly 61% of volume from 1900 to 2010. From 1957 to 2010 their surface's dropped in elevation on average by -8.9m, losing an estimated 71.96 x 106 ± 2.87 x 106 m3 (53%) in total volume, seen across accumulation and ablation zones, with more loss happening from 1957 to 1990. There was no relationship found between topography and area. A small correlation was found between slope and increased volume change. Debris cover on glacier surfaces has increased and showed a correlation between decreasing area loss (no correlation with volume changes).
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Marcott, Shaun Andrew. "A Tale of Three Sisters: Reconstructing the Holocene glacial history and paleoclimate record at Three Sisters Volcanoes, Oregon, United States." PDXScholar, 2005. https://pdxscholar.library.pdx.edu/open_access_etds/3386.

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At least four glacial stands occurred since 6.5 ka B.P. based on moraines located on the eastern flanks of the Three Sisters Volcanoes and the northern flanks of Broken Top Mountain in the Central Oregon Cascades. The youngest of these advances was the Little Ice Age (LIA) glaciation, which reached its maximum advance 150-200 yrs. B.P. and is defined by the large sharp crested and unvegetated moraines adjacent to the modern glaciers. In isolated locations less than 100 m downslope from these moraines, a second set of sparsely vegetated lateral moraines marks the Late-Neoglacial stand of the glaciers between 2.1 ± 0.4 and 7.7 ka B.P, A third set of Early-Neoglacial end moraines is 300-700 meters downslope of the modern glacier termini, and postdates 7.7 ka B.P. From SST temperature data (Barron et al., 2003) and a speleothem record (Vacco, 2003), we infer that this advance occurred between 4.5 and 6.5 ka B.P. Finally, the Fountonnor stand is marked by moraines 500-900 meters downslope of the modern glacier termini, and we infer these are latest Pleistocene or early Holocene. Modem equilibrium line altitudes (ELAs) at the Three Sisters and Broken Top are approximately 2500 - 2600 m. During the LIA, the ELAs were 40 - 180 m lower, requiring cooler mean summer temperatures by 0.7 - 1.0°C and winter snowfall to increase by 10 - 60 cm water equivalent. The average Early Neoglacial and Fountonnor ELAs were 130 - 300 m and 290 - 320 m lower than modem glaciers, respectively, requiring air temperatures to be 0.7 - 1.6°C and 1.5 - 1.7°C cooler during the summer and winter snowfall to be 40 - 100 cm water equivalent and 90 - 100 cm water equivalent greater.
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Riddick, Susan Nancy 1987. "A Time Series Analysis of Volcanic Deformation near Three Sisters, Oregon, using InSAR." Thesis, University of Oregon, 2011. http://hdl.handle.net/1794/11479.

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x, 57 p. : ill. (mostly col.)
An extensive area west of the Three Sisters volcanoes of Oregon has been actively uplifting for over a decade. Examining the deformation is imperative to improve understanding of the potential hazards of Cascade volcanism and the emplacement of magma. I refine the timing of the onset of the deformation, resolve the change in uplift rates through time, and quantify the current deformation rate using Interferometric Synthetic Aperture Radar. The deformation is assessed in time and space using single interferogram InSAR, stacks of interferograms, and line-of-sight time series. I examine the shape of the deformation pattern and explore volcanic source parameters using a Mogi model and tension crack model with topographic corrections. By using the best fit model and combining all useable interferograms from different tracks, I create the first complete continuous inflation time series of the Three Sisters volcanic uplift from 1992 to 2010.
Committee in charge: Dr. David A. Schmidt, Chair; Dr. Katharine V. Cashman, Member; Dr. Joshua J. Roering, Member
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Mordensky, Stanley, and Stanley Mordensky. "The Plumbing Systems and Parental Magma Compositions of Shield Volcanoes in the Central Oregon High Cascades as Inferred from Melt Inclusion Data." Thesis, University of Oregon, 2012. http://hdl.handle.net/1794/12544.

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Long-lived and short-lived volcanic vents often form in close proximity to one another. However, the processes that distinguish between these volcano types remain unknown. Here, I investigate the differences of long-lived (shield volcano) and short-lived (cinder cone) magmatic systems using two approaches. In the first, I use melt inclusion volatile contents for shield volcanoes and compare them to published data for cinder cones to investigate how shallow magma storage conditions differ between the two vent types in the Oregon Cascades. In the second, I model the primitive magmas that fed shield volcanoes and compare these compositions to those of nearby cinder cones to determine if the volcanoes are drawing magma from the same sources. The volatile concentrations suggest that long-lived and short-lived magmatic plumbing systems are distinct. Modeling of parental magmas and differentiation processes further suggest that long-lived and short-lived volcanoes have erupted lava from the same mantle magma source.
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Steiner, Arron Richard. "Field Geology and Petrologic Investigation of the Strawberry Volcanics, Northeast Oregon." PDXScholar, 2016. http://pdxscholar.library.pdx.edu/open_access_etds/2712.

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The Strawberry Volcanics of Northeast Oregon are a group of geochemically related lavas with a diverse chemical range (basalt to rhyolite) that erupted between 16.2 and 12.5 Ma and co-erupted with the large, (~200,000 km3) Middle Miocene tholeiitic lavas of the Columbia River Basalt Group (CRBG), which erupted near and geographically surround the Strawberry Volcanics. The rhyolitic lavas of the Strawberry Volcanics produced the oldest 40Ar/39Ar ages measured in this study with ages ranging from 16.2 Ma to 14.6 Ma, and have an estimated total erupted volume of 100 km3. The mafic and intermediate lavas of the Strawberry Volcanics include both tholeiitic and calc-alkaline compositions; calc-alkaline andesite is the dominant type by volume. 40Ar/39Ar ages of the mafic and intermediate lava flows range from 15.6 Ma to 12.5 Ma, and volume estimates of the intermediate lavas are approximately 1,100 km3. The magmas that gave rise to the Strawberry Volcanics traveled to the surface through numerous dikes, some of which have been exposed at the surface and supplied lava to fissure – style eruptions and/or shield volcanoes. Herein, we show that the Strawberry Volcanics are related to the CRBG in both time and space and share a chemical affinity, specifically to the Steens Basalt. Chemical similarities are observed in normalized trace element patterns, selected trace element ratios, and radiogenic isotopes. Comparison of the Strawberry Volcanic rhyolites to the other Middle Miocene rhyolites of eastern Oregon associated with the initiation of the Yellowstone – Snake River mantle plume reveals similar eruption ages, trace element compositions, including the rare earth elements (REEs), and "A-type" rhyolite characteristics. These data suggest that the Strawberry Volcanics are part of the regional volcanism (basalt to rhyolite) of the Columbia River Basalt Province. The petrogenesis of the Strawberry Volcanics can be explained as follows: 1) The tholeiitic, intermediate magmas were produced by fractional crystallization of mafic magmas, which have a commonality with the surrounding Columbia River Basalt Group; 2) The calc-alkaline magmas are a result of mixing between tholeiitic basalt, rhyolite, and crust. The arc-like signature of the calc-alkaline lavas (elevated large ion lithophiles) is a result of both the melting source region and the end-members with which the mafic magmas mixed/contaminated. Other authors have produced similar findings from within the Basin and Range/Oregon-Idaho graben and CRB province. The difference at the Strawberry Volcanics is that there is no need for a primitive calc-alkaline magma or extensive fractional crystallization to generate the calc-alkaline andesites. Alternatively, the calc-alkaline magmas of the Strawberry Volcanics were generated by a more primitive tholeiitic magma than erupted at the surface, which interacted with crustal melts and assimilated crustal lithologies from the complex zone of assimilated terranes that make up the basement of eastern Oregon.
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Woods, Melinda Michelle. "Compositional and mineralogical relationships between mafic inclusions and host lavas as key to andesite petrogenesis at Mount Hood Volcano, Oregon." PDXScholar, 2004. https://pdxscholar.library.pdx.edu/open_access_etds/4312.

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Throughout its eruptive history, Mount Hood has produced compositionally similar calc-alkaline andesite as lava flows and domes near the summit and basaltic andesitic flows from flank vents. Found within the andesite are slightly more mafic inclusions that are compositionally similar to the host andesite (or host lavas); no inclusions were found in the flank lavas. Host lavas and inclusions have the following mineral assemblage: plag + opx ± cpx ± amp + oxides. Flank lava mineralogy is similar to the inclusions and host lavas, but since they are more mafic they contain olivine instead of amphibole. Average silica content among samples analyzed ranges from 57.6 to 62.7 weight percent; however the incompatible trace element composition is more variable at lower silica contents and becomes less variable at higher silica contents. In terms of incompatible trace element composition, the host lavas and inclusions are either depleted (no amp) or enriched (amp± cpx).
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8

Jordan, Alexandra M. "An overview of the volcano-tectonic hazards of Portland, Oregon, and an assessment of emergency preparedness." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/114368.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences, 2011.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 106-119).
Portland, Oregon, lies within an active tectonic margin, which puts the city at risk to hazards from earthquakes and volcanic eruptions. The young Juan de Fuca microplate is subducting under North America, introducing not only arc magmatism into the overlying plate, but also interplate and intraplate seismicity related to the subduction zone. Large crustal earthquakes are also probable in Portland because of the oblique strike-slip Portland Hills Fault zone. These hazards create risk to Portland residents and infrastructure because of pre-existing vulnerabilities. Much of Portland's downtown area, including the government and business districts, is at risk of ground shaking infrastructure damage, liquefaction and landslides due to earthquakes. Additionally, the city is within 110 km of three active Cascadia stratovolcanoes, two of which pose hazards from tephra and lahars. Though the city is under the umbrella of four emergency response plans-city, county, state and federal-there are critical gaps in mitigation strategies, emergency exercises and community education and outreach. Portland cannot prevent earthquakes or volcanic eruptions, but the city can reduce its vulnerability to these hazards.
by Alexandra M. Jordan.
S.B.
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Ellowitz, Molly Kathryn. "Dynamics of Magma Recharge and Mixing at Mount Hood Volcano, Oregon -- Insights from Enclave-bearing Lavas." PDXScholar, 2018. https://pdxscholar.library.pdx.edu/open_access_etds/4544.

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Magma recharge events and subsequent mixing processes are understood to precede volcanic eruptions. Textural evidence of intrusion of hot, mafic magma into a cooler, rheologically locked silicic magma is commonplace. Solidified "blobs" of injected magma, called enclaves, are evidence of magma mixing, but the petrological and mechanical conditions during their formation are debated. Mount Hood, Oregon consistently erupts andesite bearing compositionally similar enclaves. These enclaves are evidence of mingling and mixing of two magmas. However, due to the compositional similarity between enclave and host lava (e.g. ~1-5 wt.% difference in SiO2), it is unclear whether the preserved enclaves represent; 1) partially hybridized mafic melt remaining after mixing with significant crystal exchange with the host magma or 2) the preserved remnants of the intruding magma during recharge, with no homogenization or crystal exchange with the host magma. The aim of this study is to understand how and why enclaves form in compositionally similar host magmas, such as those at Mount Hood. Building off previous research, we utilize a combination of field observations, chemical analyses, and numerical modeling to constrain the rheology of the magmas prior to and during mixing. The degree of magma mixing is dependent on the viscosity contrast between the host and intruding magmas. Since these magmas are similar compositionally, variations in other magmatic properties such as crystallinity, and therefore temperature, and density may drive the viscosity differences between the host and intruding magmas needed for enclave formation. The enclaves at Mount Hood are vesicular (13-28%), coarse-grained; made up of mainly groundmass crystals (200-450 µm) with sparse microlites (< 200 µm), glass (450 µm) proportions, and rarely contain quenched margins. Additionally, crystals within the host magma show preferential alignment along the margins between host and enclave, suggesting a fluid behavior of the host magma during mixing. Based on textural and compositional evidence, we hypothesize that the intruding magma was buoyant, viscous, and crystalline, due to decompression-induced crystallization and exsolution of volatiles, during recharge and ascent to the shallow magma reservoir. Injection and underplating of the viscous crystalline intruding magma into a hot convecting host magma induces enclave formation. Crystallization temperatures differ by only 6-15 °C between host and enclave lavas, derived by the two pyroxene geothermometry method by Putrika (2008). These crystallization temperatures are consistent with crystallization in compositionally similar magmas. However, with such similar crystallization and liquidus temperatures, maintaining a viscosity contrast between the mixing magmas for enclave survival after formation suggests other properties, apart from temperature, must explain the viscosity contrast needed for enclave survival after enclave dispersal and thermal equilibration occurs. The presence of bubbles, from exsolution during crystallization, within the enclave magma increases the viscosity while simultaneously decreasing the density. Therefore, the presence of bubbles increases the viscosity of the intruding magma and maintains the viscosity contrast during the mixing process after thermal equilibration occurs. Additionally, if degassing occurs, rapid crystallization maintains the high viscosity of the enclaves. The enclaves observed at Mount Hood represent the solidified remnants of the last recharge event prior to eruption. The presence of compositionally similar enclaves and host lavas suggest a transient precursor event just prior to eruption at Mount Hood and can be applied to other recharge-driven arc volcanic systems.
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McKay, Daniele, and Daniele McKay. "Recent Mafic Eruptions at Newberry Volcano and in the Central Oregon Cascades: Physical Volcanology and Implications for Hazards." Thesis, University of Oregon, 2012. http://hdl.handle.net/1794/12516.

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Mafic eruptions have been the dominant form of volcanic activity in central Oregon throughout the Holocene. These eruptions have produced cinder cones, extensive lava flows, and tephra blankets. In most cases, the extent and volume of the tephra blankets has not been determined, despite the fact that future tephra production would pose considerable hazards to transportation, infrastructure, and public health. The economy of the region, which is largely based in tourism, would also be negatively impacted. For this reason, developing a better understanding of the extent and dynamics of tephra production at recent mafic vents is critical, both in terms of mitigating the hazards associated with future eruptions and in improving our scientific understanding of explosive mafic activity. Here I present detailed field and laboratory studies of tephra from recent mafic vents at Newberry Volcano and in the central Oregon High Cascades. Studies of Newberry vents show that eruption style is strongly correlated with eruptive volume, that extensive magma storage and assimilation occurred prior to the eruption of these vents, and that minimum pre-magmatic water content as recorded by plagioclase was 2.5 wt.%. Detailed mapping and physical studies of tephra deposits from High Cascades vents show that several recent eruptions produced extensive tephra deposits. These deposits are physically similar to well-documented historic eruptions that have been characterized as violent strombolian. At least one Cascade cinder cone (Sand Mountain) produced a tephra deposit that is unusually large in volume and characterized by uniformly fine-grained clasts, which is interpreted as evidence for syn-eruptive interaction with external water. Microtextural characteristics of tephra, along with an evaluation of possible water sources, support this interpretation. These investigations demonstrate that magma storage and eruption style at mafic vents is both variable and complex. Additionally, these studies show that cinder cones in central Oregon have the potential to erupt much more explosively than previously assumed. The results of this study will be an important tool for developing comprehensive regional hazard assessments. This dissertation includes previously published and unpublished co-authored material.
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Books on the topic "Volcanoes – Oregon"

1

Miller, G. A. Paper II, a gas-volcanic solution to the Crater Lake, Oregon, collapse structure. [S.l: s.n., 1993.

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Hammond, Paul E. Guide to geology of the Cascade Range: Portland, Oregon to Seattle, Washington. Washington, D.C: American Geophysical Union, 1989.

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Iwatsubo, E. Y. Measurements of slope distances and zenith angles at Newberry and South Sister volcanoes, Oregon, 1985-1986. [Menlo Park, Calif.]: U.S. Geological Survey, 1988.

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United States Geological Survey. Volcano hazards at Newberry Volcano, Oregon. [Menlo Park, CA]: U.S. Geological Survey, 1997.

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United States. Congress. House. Committee on Interior and Insular Affairs. Establishing the Newberry Volcanoes National Monument in the State of Oregon, and for other purposes: Report (to accompany H.R. 3840) (including cost estimate of the Congressional Budget Office). [Washington, D.C.?: U.S. G.P.O., 1990.

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Fitterman, David V. Electrical structure of Newberry Volcano, Oregon. [Denver, Colo.?]: U.S. Dept. of the Interior, Geological Survey, 1988.

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Fitterman, David V. Electrical structure of Newberry Volcano, Oregon. [Denver, Colo.?]: U.S. Dept. of the Interior, Geological Survey, 1988.

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Fitterman, David V. Electrical structure of Newberry Volcano, Oregon. [Denver, Colo.?]: U.S. Dept. of the Interior, Geological Survey, 1988.

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Bargar, Keith E. Hydrothermal mineralization in GEO N-1 Drill Hole, Newberry Volcano, Oregon. [Reston, Va.?]: U.S. Dept. of the Interior, Geological Survey, 1986.

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Bargar, Keith E. Hydrothermal mineralization in GEO N-1 Drill Hole, Newberry Volcano, Oregon. [Reston, Va.?]: U.S. Dept. of the Interior, Geological Survey, 1986.

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Book chapters on the topic "Volcanoes – Oregon"

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Donnelly-Nolan, Julie M. "Medicine Lake Volcano California." In South Cascades Arc Volcanism, California and Southern Oregon: Red Bluff to Redding, California, July 20–26, 1989, 15–21. Washington, D. C.: American Geophysical Union, 1989. http://dx.doi.org/10.1029/ft312p0015.

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Jensen, Robert A., Julie M. Donnelly-Nolan, and Daniele Mckay. "A field guide to Newberry Volcano, Oregon." In Volcanoes to Vineyards: Geologic Field Trips through the Dynamic Landscape of the Pacific Northwest, 53–79. Geological Society of America, 2009. http://dx.doi.org/10.1130/2009.fld015(03).

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Donnelly-Nolan, Julie M., and Robert A. Jensen. "Ice and water on Newberry Volcano, central Oregon." In Volcanoes to Vineyards: Geologic Field Trips through the Dynamic Landscape of the Pacific Northwest, 81–90. Geological Society of America, 2009. http://dx.doi.org/10.1130/2009.fld015(04).

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Dillhoff, Richard M., Thomas A. Dillhoff, Regan E. Dunn, Jeffrey A. Myers, and Caroline A. E. Strömberg. "Cenozoic paleobotany of the John Day Basin, central Oregon." In Volcanoes to Vineyards: Geologic Field Trips through the Dynamic Landscape of the Pacific Northwest, 135–64. Geological Society of America, 2009. http://dx.doi.org/10.1130/2009.fld015(07).

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Badger, Thomas C., and Robert J. Watters. "Landslides along the Winter Rim fault, Summer Lake, Oregon." In Volcanoes to Vineyards: Geologic Field Trips through the Dynamic Landscape of the Pacific Northwest, 203–20. Geological Society of America, 2009. http://dx.doi.org/10.1130/2009.fld015(10).

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Lund, John W., Toni L. Boyd, Harriet Cornachione, Anne Hiller Clark, and Sara A. Marcus. "Geothermal geology and utilization in Oregon: A field guide." In Volcanoes to Vineyards: Geologic Field Trips through the Dynamic Landscape of the Pacific Northwest, 583–98. Geological Society of America, 2009. http://dx.doi.org/10.1130/2009.fld015(27).

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Mckay, Daniele, Julie M. Donnelly-Nolan, Robert A. Jensen, and Duane E. Champion. "The post-Mazama northwest rift zone eruption at Newberry Volcano, Oregon." In Volcanoes to Vineyards: Geologic Field Trips through the Dynamic Landscape of the Pacific Northwest, 91–110. Geological Society of America, 2009. http://dx.doi.org/10.1130/2009.fld015(05).

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Yule, Doug, Tom Wiley, M. Allan Kays, and Robert Murray. "Late Triassic to Late Jurassic petrotectonic history of the Oregon Klamath Mountains." In Volcanoes to Vineyards: Geologic Field Trips through the Dynamic Landscape of the Pacific Northwest, 165–85. Geological Society of America, 2009. http://dx.doi.org/10.1130/2009.fld015(08).

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LaMaskin, Todd A., Joshua J. Schwartz, Rebecca J. Dorsey, Arthur W. Snoke, Kenneth Johnson, and Jeffery D. Vervoort. "Mesozoic sedimentation, magmatism, and tectonics in the Blue Mountains Province, northeastern Oregon." In Volcanoes to Vineyards: Geologic Field Trips through the Dynamic Landscape of the Pacific Northwest, 187–202. Geological Society of America, 2009. http://dx.doi.org/10.1130/2009.fld015(09).

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Davis, Loren G., Steven A. Jenevein, Michele L. Punke, Jay S. Noller, Julia A. Jones, and Samuel C. Willis. "Geoarchaeological themes in a dynamic coastal environment, Lincoln and Lane Counties, Oregon." In Volcanoes to Vineyards: Geologic Field Trips through the Dynamic Landscape of the Pacific Northwest, 319–36. Geological Society of America, 2009. http://dx.doi.org/10.1130/2009.fld015(16).

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Conference papers on the topic "Volcanoes – Oregon"

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Arrington, Eric S., Stephen C. Kuehn, and Stephen C. Kuehn. "THREE SISTERS VOLCANOES, OREGON, A POTENTIALLY SIGNIFICANT TEPHRA SOURCE." In 65th Annual Southeastern GSA Section Meeting. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016se-273769.

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Buczkowski, Debra, Laura Fattaruso, Eileen M. McGowan, and George McGill. "THE VOLCANOES OF THE LACHESIS TESSERA QUADRANGLE (V-18), VENUS." In GSA Connects 2021 in Portland, Oregon. Geological Society of America, 2021. http://dx.doi.org/10.1130/abs/2021am-369063.

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Carrasco, Gerardo, Jaime Cavazos, and Michael H. Ort. "LOCATIONAL CONTROLS OF HOLOCENE MAAR VOLCANOES IN THE EASTERN MEXICAN VOLCANIC BELT." In GSA Connects 2021 in Portland, Oregon. Geological Society of America, 2021. http://dx.doi.org/10.1130/abs/2021am-370742.

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Richardson, Jacob, Sarah S. Sutton, Sarah S. Sutton, Patrick L. Whelley, Patrick L. Whelley, Stephen P. Scheidt, and Stephen P. Scheidt. "VENT DEVELOPMENT AT THE HOLUHRAUN LAVA FLOW (NORTHERN ICELAND) AND SMALL MARTIAN VOLCANOES." In GSA Connects 2021 in Portland, Oregon. Geological Society of America, 2021. http://dx.doi.org/10.1130/abs/2021am-370494.

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Salisbury, Morgan. "DECOLONIZING THE EARTH SCIENCE CLASSROOM: USING VOLCANOES TO TEACH GEOLOGY FROM A NON-EUROCENTRIC VIEWPOINT." In GSA Connects 2021 in Portland, Oregon. Geological Society of America, 2021. http://dx.doi.org/10.1130/abs/2021am-370643.

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Parker, Donnie, Jonathan D. Price, Cynthia B. Brooks, and Minghua Ren. "CONTRASTING MAGMATIC EVOLUTIONS OF THE THREE SISTER VOLCANOES, CENTRAL OREGON CASCADE ARC, USA." In GSA Connects 2022 meeting in Denver, Colorado. Geological Society of America, 2022. http://dx.doi.org/10.1130/abs/2022am-377118.

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Abbott, Dallas, Anzim Sultan, and Malik Atadzhanov. "WHAT IS THE COMPOSITION AND AGE OF VOLCANISM ON NORTHERN MID LATITUDE AND TROPICAL SUBMARINE VOLCANOES?" In GSA Connects 2021 in Portland, Oregon. Geological Society of America, 2021. http://dx.doi.org/10.1130/abs/2021am-367483.

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Clay, John Mitchell, Matthew Gorring, and Tanya M. Blacic. "PETROGENESIS OF PLEISTO-HOLOCENE BASALTS FROM NEWBERRY VOLCANO, OREGON." In GSA Annual Meeting in Seattle, Washington, USA - 2017. Geological Society of America, 2017. http://dx.doi.org/10.1130/abs/2017am-308341.

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Lerner, Allan, and Paul J. Wallace. "KĪLAUEA VOLCANO’S INTERMITTENT OPEN-SYSTEM BEHAVIOR: PETROLOGIC EVIDENCE AND IMPLICATIONS FOR ERUPTION STYLE." In GSA Connects 2021 in Portland, Oregon. Geological Society of America, 2021. http://dx.doi.org/10.1130/abs/2021am-367117.

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Brumberg, Hilary, Paula Tartell, Lena R. Capece, and Johan C. Varekamp. "CARBON CYCLING IN EAST LAKE AND PAULINA LAKE, NEWBERRY VOLCANO, OREGON." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-283589.

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Reports on the topic "Volcanoes – Oregon"

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Ohlschlager, Justin. Glacier Change on the Three Sisters Volcanoes, Oregon: 1900-2010. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.2445.

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Marcott, Shaun. A Tale of Three Sisters: Reconstructing the Holocene glacial history and paleoclimate record at Three Sisters Volcanoes, Oregon, United States. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.5275.

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Waibel, Albert F., Zachary S. Frone, and David D. Blackwell. Geothermal Exploration of Newberry Volcano, Oregon. Office of Scientific and Technical Information (OSTI), December 2014. http://dx.doi.org/10.2172/1182676.

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Steiner, Arron. Field Geology and Petrologic Investigation of the Strawberry Volcanics, Northeast Oregon. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.2708.

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Stauber, D. A., N. M. Iyer, W. D. Mooney, and P. B. Dawson. Three-dimensional p-velocity structure of the summit caldera of Newberry Volcano, Oregon. Office of Scientific and Technical Information (OSTI), January 1985. http://dx.doi.org/10.2172/6314574.

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Ellowitz, Molly. Dynamics of Magma Recharge and Mixing at Mount Hood Volcano, Oregon -- Insights from Enclave-bearing Lavas. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.6429.

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Jackson, Michael. Stratigraphic relationships of the Tillamook Volcanics and the Cowlitz Formation in the upper Nehalem River-Wolf Creek area, northwestern Oregon. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.3265.

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Woods, Melinda. Compositional and mineralogical relationships between mafic inclusions and host lavas as key to andesite petrogenesis at Mount Hood Volcano, Oregon. Portland State University Library, January 2000. http://dx.doi.org/10.15760/etd.6196.

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Geologic map of Newberry Volcano, Deschutes, Klamath, and Lake counties, Oregon. US Geological Survey, 1995. http://dx.doi.org/10.3133/i2455.

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Flow testing of the Newberry 2 research drillhole, Newberry volcano, Oregon. US Geological Survey, 1986. http://dx.doi.org/10.3133/wri864133.

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