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Journal articles on the topic 'Volcanoes – Oregon'

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Published: 10 December 2022

Last updated: 28 January 2023

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1

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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2

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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3

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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4

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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5

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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6

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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7

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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8

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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9

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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10

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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11

Foit, Franklin F., and Peter J. Mehringer. "Holocene tephra stratigraphy in four lakes in southeastern Oregon and northwestern Nevada, USA." Quaternary Research 85, no. 2 (March 2016): 218–26. http://dx.doi.org/10.1016/j.yqres.2015.12.008.

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To better understand the regional tephra stratigraphy and chronology of northern Nevada and southern Oregon, tephras in archived cores, taken as part of the Steens Mountain Prehistory Project from four lakes, Diamond Pond, Fish and Wildhorse lakes in southeastern Oregon and Blue Lake in northwestern Nevada, were reexamined using more advanced electron microprobe analytical technology. The best preserved and most complete core from Fish Lake along with Wildhorse Lake hosted two tephras from Mt. Mazama (Llao Rock and the Climactic Mazama), a mid-Holocene basaltic tephra from Diamond Craters, Oregon, two Medicine Lake tephras and an unexpected late Holocene Chaos Crags (Mt. Lassen volcanic center) tephra which was also found in the other lakes. Blue Lake was the only lake that hosted a Devils Hill tephra from the Three Sisters volcano in west central Oregon. Another tephra from the Three Sisters Volcano previously reported in sediments of Twin Lakes in NE Oregon, has now been confirmed as Rock Mesa tephra. The Chaos Crags, Devils Hill and Rock Mesa tephras are important late Holocene stratigraphic markers for central and eastern Oregon and northwestern Nevada.

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12

Fitterman, D. V., W. D. Stanley, and R. J. Bisdorf. "Electrical structure of Newberry Volcano, Oregon." Journal of Geophysical Research: Solid Earth 93, B9 (September 10, 1988): 10119–34. http://dx.doi.org/10.1029/jb093ib09p10119.

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13

Gettings, M. E., and Andrew Griscom. "Gravity model studies of Newberry Volcano, Oregon." Journal of Geophysical Research: Solid Earth 93, B9 (September 10, 1988): 10109–18. http://dx.doi.org/10.1029/jb093ib09p10109.

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14

Sammel, E. A., S. E. Ingebritsen, and R. H. Mariner. "The hydrothermal system at Newberry Volcano, Oregon." Journal of Geophysical Research: Solid Earth 93, B9 (September 10, 1988): 10149–62. http://dx.doi.org/10.1029/jb093ib09p10149.

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15

MARSHALL, CHRISTOPHER J., and DAVID A. LYTLE. "Two new species of Grylloblatta Walker, 1914 (Grylloblattodea: Grylloblattidae) from western North America, and a neotype designation for G. rothi Gurney 1953." Zootaxa 3949, no. 3 (April 29, 2015): 408. http://dx.doi.org/10.11646/zootaxa.3949.3.6.

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Grylloblatta rothi Gurney, 1953 is redescribed and a neotype is designated from Cultus Mountain in the Oregon Cascades, U.S.A. Two new species of Grylloblatta are described, bringing the total number of Grylloblatta species to 15. Grylloblatta chintimini new species is described from Marys Peak in the Coast Range of Western Oregon, where it occurs on snowpack near the 1250 m summit. Grylloblatta newberryensis new species is described from Newberry Volcano in Central Oregon, where it is associated with snowfields overlying geologically-young lava flows. Morphological characters, primarily derived from male genitalia, are presented to diagnose these species and differentiate them from other Grylloblatta spp. in Oregon, Washington, and California. Molecular sequences from the cytochrome oxidase subunit II gene suggest that significant divergence has occurred among these species and provide a tool to aid identification of juvenile and female specimens.

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16

Bonneville, Alain, Trenton T. Cladouhos, Susan Petty, Adam Schultz, Carsten Sørlie, Hiroshi Asanuma, Guðmundur Ómar Friðleifsson, Claude Jaupart, and Giuseppe de Natale. "The Newberry Deep Drilling Project (NDDP) workshop." Scientific Drilling 24 (October 22, 2018): 79–86. http://dx.doi.org/10.5194/sd-24-79-2018.

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Abstract. The important scientific questions that will form the basis of a full proposal to drill a deep well to the ductile–brittle transition zone (T>400 ∘C) at Newberry Volcano, central Oregon state, USA, were discussed during an International Continental Drilling Program (ICDP) sponsored workshop held at the Oregon State University-Cascades campus in Bend, Oregon, from 10 to 13 September 2017. Newberry Volcano is one of the largest geothermal heat reservoirs in the USA and has been extensively studied for the last 40 years. The Newberry Deep Drilling Project (NDDP) will be located at an idle geothermal exploration well, NWG 46-16, drilled in 2008, 3500 m deep and 340–374 ∘C at bottom, which will be deepened another 1000 to 1300 m to reach 500 ∘C. The workshop concluded by setting ambitious goals for the NDDP: (1) test the enhanced geothermal system (EGS) above the critical point of water, (2) collect samples of rocks within the brittle–ductile transition, (3) investigate volcanic hazards, (4) study magmatic geomechanics, (5) calibrate geophysical imaging techniques, and (6) test technology for drilling, well completion, and geophysical monitoring in a very high-temperature environment. Based on these recommendations, a full drilling proposal was submitted in January 2018 to the ICDP for deepening an existing well. The next steps will be to continue building a team with project, technology, and investment partners to make the NDDP a reality.

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17

MacLeod, Norman S., and David R. Sherrod. "Geologic evidence for a magma chamber beneath Newberry Volcano, Oregon." Journal of Geophysical Research: Solid Earth 93, B9 (September 10, 1988): 10067–79. http://dx.doi.org/10.1029/jb093ib09p10067.

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18

Stauber, Douglas A., Susan M. Green, and H. M. Iyer. "Three-dimensionalPvelocity structure of the crust below Newberry Volcano, Oregon." Journal of Geophysical Research: Solid Earth 93, B9 (September 10, 1988): 10095–107. http://dx.doi.org/10.1029/jb093ib09p10095.

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19

Carothers, William W., Robert H. Mariner, and Terry E. C. Keith. "Isotope geochemistry of minerals and fluids from Newberry volcano, Oregon." Journal of Volcanology and Geothermal Research 31, no. 1-2 (March 1987): 47–63. http://dx.doi.org/10.1016/0377-0273(87)90005-9.

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20

Dzurisin, Daniel. "Results of repeated leveling surveys at Newberry Volcano, Oregon, and near Lassen Peak Volcano, California." Bulletin of Volcanology 61, no. 1-2 (July 11, 1999): 83–91. http://dx.doi.org/10.1007/s004450050264.

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21

Fitterman, David V. "Overview of the structure and geothermal potential of Newberry Volcano, Oregon." Journal of Geophysical Research: Solid Earth 93, B9 (September 10, 1988): 10059–66. http://dx.doi.org/10.1029/jb093ib09p10059.

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22

Linneman, S. R., and J. D. Myers. "Magmatic inclusions in the Holocene rhyolites of Newberry Volcano, central Oregon." Journal of Geophysical Research 95, B11 (1990): 17677. http://dx.doi.org/10.1029/jb095ib11p17677.

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23

Korte, David M., and Abdul Shakoor. "Landslide Susceptibility and Soil Loss Estimates for Drift Creek Watershed, Lincoln County, Oregon." Environmental and Engineering Geoscience 26, no. 2 (May 27, 2020): 167–84. http://dx.doi.org/10.2113/eeg-2251.

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ABSTRACT Drift Creek watershed, Lincoln County, Oregon, is a source of drinking water as well as a reproductive habitat for endangered salmon and trout species. Landslides, exacerbated by logging, are suspected as a cause of water quality deterioration in the watershed. To investigate the impact of landslides on water quality, we mapped landslide distribution and susceptibility, determined engineering properties of landslide-prone soil and rock, and estimated soil loss resulting from landslide-derived sediment within 30 m of Strahler third-order-or-higher streams in the watershed. We mapped 570 landslides using LiDAR imaging, orthophotographs, and field observations. We used logistic regression to determine the most significant variables contributing to landslide occurrence and to create a watershed-scale landslide susceptibility map. Siletz River Volcanics and the sedimentary Tyee Formation make up 85 percent of the watershed, with the sedimentary Yamhill and Nestucca formations making up the majority of the rest. Sedimentary rocks dominate in the Upper Drift Creek watershed, and volcanic dominate in the lower portion. The largest landslide deposits and the highest susceptibility occur in the sedimentary rock formations. The Siletz River Volcanics has a larger abundance of landslides than the sedimentary rock formations, but they are smaller in size with lower susceptibility of occurrence. The soil loss model indicates that the average annual soil loss from landslide deposits in the Upper Drift Creek watershed is 65 tons/acre/yr compared to 29 tons/acre/yr in the Lower Drift Creek watershed. The model also indicates that soil loss from areas along roads in the watershed is high.

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24

Pflitsch, Andreas, Eddy Cartaya, Brent McGregor, David Holmgren, and Björn Steinhöfel. "Climatologic studies inside Sandy Glacier at Mount Hood Volcano in Oregon, USA." Journal of Cave and Karst Studies 79, no. 3 (December 2017): 189–206. http://dx.doi.org/10.4311/2015ic0135.

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25

Swanberg, Chandler A., William C. Walkey, and Jim Combs. "Core hole drilling and the “rain curtain” phenomenon at Newberry Volcano, Oregon." Journal of Geophysical Research: Solid Earth 93, B9 (September 10, 1988): 10163–73. http://dx.doi.org/10.1029/jb093ib09p10163.

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26

Carlson, Richard W., Timothy L. Grove, and Julie M. Donnelly-Nolan. "Origin of Primitive Tholeiitic and Calc-Alkaline Basalts at Newberry Volcano, Oregon." Geochemistry, Geophysics, Geosystems 19, no. 4 (April 2018): 1360–77. http://dx.doi.org/10.1029/2018gc007454.

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27

Lefkowitz, J. N., J. C. Varekamp, R. W. Reynolds, and E. Thomas. "A tale of two lakes: the Newberry Volcano twin crater lakes, Oregon, USA." Geological Society, London, Special Publications 437, no. 1 (November 25, 2016): 253–88. http://dx.doi.org/10.1144/sp437.15.

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28

Goles, Gordon G., and Richard St J. Lambert. "A strontium isotopic study of Newberry volcano, central Oregon: Structural and thermal implications." Journal of Volcanology and Geothermal Research 43, no. 1-4 (October 1990): 159–74. http://dx.doi.org/10.1016/0377-0273(90)90050-p.

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29

Lewicki, Jennifer L., William C. Evans, Steven E. Ingebritsen, Laura E. Clor, Peter J. Kelly, Sara Peek, Robert A. Jensen, and Andrew G. Hunt. "Geochemistry and fluxes of gases from hydrothermal features at Newberry Volcano, Oregon, USA." Journal of Volcanology and Geothermal Research 433 (January 2023): 107729. http://dx.doi.org/10.1016/j.jvolgeores.2022.107729.

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30

Keith, Terry E. C. "Zeolites in Eocene Basaltic Pillow Lavas of the Siletz River Volcanics, Central Coast Range, Oregon." Clays and Clay Minerals 33, no. 2 (1985): 135–44. http://dx.doi.org/10.1346/ccmn.1985.0330208.

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31

Catchings, R. D., and W. D. Mooney. "Crustal structure of east central Oregon: Relation between Newberry Volcano and regional crustal structure." Journal of Geophysical Research: Solid Earth 93, B9 (September 10, 1988): 10081–94. http://dx.doi.org/10.1029/jb093ib09p10081.

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32

Achauer, Ulrich, John R. Evans, and Douglas A. Stauber. "High-resolution seismic tomography of compressional wave velocity structure at Newberry Volcano, Oregon Cascade Range." Journal of Geophysical Research: Solid Earth 93, B9 (September 10, 1988): 10135–47. http://dx.doi.org/10.1029/jb093ib09p10135.

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33

Wells, Ray E., Richard J. Blakely, and Sean Bemis. "Northward migration of the Oregon forearc on the Gales Creek fault." Geosphere 16, no. 2 (February 6, 2020): 660–84. http://dx.doi.org/10.1130/ges02177.1.

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Abstract The Gales Creek fault (GCF) is a 60-km-long, northwest-striking dextral fault system (west of Portland, Oregon) that accommodates northward motion and uplift of the Oregon Coast Range. New geologic mapping and geophysical models confirm inferred offsets from earlier geophysical surveys and document ∼12 km of right-lateral offset of a basement high in Eocene Siletz River Volcanics since ca. 35 Ma and ∼8.8 km of right-lateral separation of Miocene Columbia River Basalt at Newberg, Oregon, since 15 Ma (∼0.62 ± 0.12 mm/yr, average long-term rate). Relative uplift of Eocene Coast Range basalt basement west of the fault zone is at least 5 km based on depth to basement under the Tualatin Basin from a recent inversion of gravity data. West of the city of Forest Grove, the fault consists of two subparallel strands ∼7 km apart. The westernmost, Parsons Creek strand, forms a linear valley southward to Henry Hagg Lake, where it continues southward to Newberg as a series of en echelon strands forming both extensional and compressive step-overs. Compressive step-overs in the GCF occur at intersections with ESE-striking sinistral faults crossing the Coast Range, suggesting the GCF is the eastern boundary of an R′ Riedel shear domain that could accommodate up to half of the ∼45° of post–40 Ma clockwise rotation of the Coast Range documented by paleomagnetic studies. Gravity and magnetic anomalies suggest the western strands of the GCF extend southward beneath Newberg into the Northern Willamette Valley, where colinear magnetic anomalies have been correlated with the Mount Angel fault, the proposed source of the 1993 M 5.7 Scotts Mills earthquake. The potential-field data and water-well data also indicate the eastern, Gales Creek strand of the fault may link to the NNW-striking Canby fault through the E-W Beaverton fault to form a 30-km-wide compressive step-over along the south side of the Tualatin Basin. LiDAR data reveal right-lateral stream offsets of as much as 1.5 km, shutter ridges, and other youthful geomorphic features for 60 km along the geophysical and geologic trace of the GCF north of Newberg, Oregon. Paleoseismic trenches document Eocene bedrock thrust over 250 ka surficial deposits along a reverse splay of the fault system near Yamhill, Oregon, and Holocene motion has been recently documented on the GCF along Scoggins Creek and Parsons Creek. The GCF could produce earthquakes in excess of Mw 7, if the entire 60 km segment ruptured in one earthquake. The apparent subsurface links of the GCF to other faults in the Northern Willamette Valley suggest that other faults in the system may also be active.

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34

Banfield, Jillian F., Blair F. Jones, and David R. Veblen. "An aem-tem study of weathering and diagenesis, Abert Lake, Oregon: I. Weathering reactions in the volcanics." Geochimica et Cosmochimica Acta 55, no. 10 (October 1991): 2781–93. http://dx.doi.org/10.1016/0016-7037(91)90444-a.

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35

Grubensky, Michael J., Gary A. Smith, and John W. Geissman. "Field and paleomagnetic characterization of lithic and scoriaceous breccias at Pleistocene Broken Top volcano, Oregon Cascades." Journal of Volcanology and Geothermal Research 83, no. 1-2 (July 1998): 93–114. http://dx.doi.org/10.1016/s0377-0273(98)00006-7.

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36

White, Craig M. "Evolution of calc-alkaline magmas at the early Quaternary Battle Ax volcano, Western Cascade Range, Oregon." Journal of Volcanology and Geothermal Research 52, no. 1-3 (September 1992): 107–22. http://dx.doi.org/10.1016/0377-0273(92)90135-z.

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37

Swanberg, Chandler A., and Jim Combs. "Geothermal drilling in the Cascade Range: Preliminary results from a 1387-m core hole, Newberry Volcano, Oregon." Eos, Transactions American Geophysical Union 67, no. 29 (1986): 578. http://dx.doi.org/10.1029/eo067i029p00578.

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38

Schmidt, M. E., and A. L. Grunder. "The evolution of North Sister: A volcano shaped by extension and ice in the central Oregon Cascade Arc." Geological Society of America Bulletin 121, no. 5-6 (April 27, 2009): 643–62. http://dx.doi.org/10.1130/b26442.1.

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39

Kuehn, Stephen C., and Franklin F. Foit. "Correlation of widespread Holocene and Pleistocene tephra layers from Newberry Volcano, Oregon, USA, using glass compositions and numerical analysis." Quaternary International 148, no. 1 (May 2006): 113–37. http://dx.doi.org/10.1016/j.quaint.2005.11.008.

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40

Thouret, Jean-Claude. "The stratigraphy, depositional processes, and environment of the late Pleistocene Polallie-period deposits at Mount Hood Volcano, Oregon, USA." Geomorphology 70, no. 1-2 (August 2005): 12–32. http://dx.doi.org/10.1016/j.geomorph.2005.03.008.

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41

Manga, Michael. "A model for discharge in spring-dominated streams and implications for the transmissivity and recharge of quaternary volcanics in the Oregon Cascades." Water Resources Research 33, no. 8 (August 1997): 1813–22. http://dx.doi.org/10.1029/97wr01339.

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42

Prothero, Donald R., Elizabeth Draus, Thomas C. Cockburn, and Elizabeth A. Nesbitt. "Paleomagnetism and counterclockwise tectonic rotation of the Upper Oligocene Sooke Formation, southern Vancouver Island, British Columbia." Canadian Journal of Earth Sciences 45, no. 4 (April 2008): 499–507. http://dx.doi.org/10.1139/e08-012.

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The age of the Sooke Formation on the southern coast of Vancouver Island, British Columbia, Canada, has long been controversial. Prior paleomagnetic studies have produced a puzzling counterclockwise tectonic rotation on the underlying Eocene volcanic basement rocks, and no conclusive results on the Sooke Formation itself. We took 21 samples in four sites in the fossiliferous portion of the Sooke Formation west of Sooke Bay from the mouth of Muir Creek to the mouth of Sandcut Creek. After both alternating field (AF) and thermal demagnetization, the Sooke Formation produces a single-component remanence, held largely in magnetite, which is entirely reversed and rotated counterclockwise by 35° ± 12°. This is consistent with earlier results and shows that the rotation is real and not due to tectonic tilting, since the Sooke Formation in this region has almost no dip. This rotational signature is also consistent with counterclockwise rotations obtained from the northeast tip of the Olympic Peninsula in the Port Townsend volcanics and the Eocene–Oligocene sediments of the Quimper Peninsula. The reversed magnetozone of the Sooke sections sampled is best correlated with Chron C6Cr (24.1–24.8 Ma) or latest Oligocene in age, based on the most recent work on the Liracassis apta Zone molluscan fauna, and also a number of unique marine mammals found in the same reversed magnetozone in Washington and Oregon.

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Johnson, Emily R., and Katharine V. Cashman. "Understanding the storage conditions and fluctuating eruption style of a young monogenetic volcano: Blue Lake crater (<3 ka), High Cascades, Oregon." Journal of Volcanology and Geothermal Research 408 (December 2020): 107103. http://dx.doi.org/10.1016/j.jvolgeores.2020.107103.

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Patella, D., A. Tramacere, R. Di Maio, and A. Siniscalchi. "Experimental evidence of resistivity frequency-dispersion in magnetotellurics in the Newberry (Oregon), Snake River Plain (Idaho) and Campi Flegrei (Italy) volcano-geothermal areas." Journal of Volcanology and Geothermal Research 48, no. 1-2 (August 1991): 61–75. http://dx.doi.org/10.1016/0377-0273(91)90033-v.

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Parker, Don F. "Extensive hybridization of mafic and silicic magmas at the confluence of the Cascade Arc and High Lava Plains: The Newberry Volcano of Central Oregon." Lithos 400-401 (November 2021): 106418. http://dx.doi.org/10.1016/j.lithos.2021.106418.

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Mercer, Celestine N., and A. Dana Johnston. "Experimental studies of the P–T–H2O near-liquidus phase relations of basaltic andesite from North Sister Volcano, High Oregon Cascades: constraints on lower-crustal mineral assemblages." Contributions to Mineralogy and Petrology 155, no. 5 (December 22, 2007): 571–92. http://dx.doi.org/10.1007/s00410-007-0259-8.

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Stelten, Mark E., and Kari M. Cooper. "Constraints on the nature of the subvolcanic reservoir at South Sister volcano, Oregon from U-series dating combined with sub-crystal trace-element analysis of plagioclase and zircon." Earth and Planetary Science Letters 313-314 (January 2012): 1–11. http://dx.doi.org/10.1016/j.epsl.2011.10.035.

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Baksi, Ajoy K. "Comment to “Distribution and geochronology of the Oregon Plateau (U.S.A.) flood basalt volcanism: The Steens Basalt Revisited” by M.E. Brueseke et al. [J. Volcanol. Geotherm. Res. 161 (2007), 187–214]." Journal of Volcanology and Geothermal Research 196, no. 1-2 (September 2010): 134–38. http://dx.doi.org/10.1016/j.jvolgeores.2010.04.007.

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Darin, Michael H., John M. Armentrout, and Rebecca J. Dorsey. "Oligocene onset of uplift and inversion of the Cascadia forearc basin, southern Oregon Coast Range, USA." Geology, February 25, 2022. http://dx.doi.org/10.1130/g49925.1.

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Abstract:

An extensive detrital zircon U-Pb data set (n = 6324 dates) from Eocene to Miocene sandstones and modern river sands establishes the onset of arc magmatism and forearc uplift along the Cascadia convergent margin in southwestern Oregon (United States). Middle to late Eocene marine strata in the Coos Bay area were primarily sourced from the Klamath Mountains and coeval Clarno-Challis volcanoes in central Oregon and/or Idaho. Ancestral Cascades arc magmatism initiated at 40 Ma and supplied sediment to a broad forearc basin in western Oregon during late Eocene time. Major reduction of Ancestral Cascades arc (40–12 Ma) and Clarno-Challis (52–40 Ma) zircon in the Tunnel Point Sandstone (ca. 33–30 Ma) records the isolation of the Coos Bay area from the Ancestral Cascades arc due to Oligocene onset of forearc uplift, basin inversion, and emergence of the southern Oregon Coast Range. The Tarheel formation (ca. 18–15 Ma) is characterized by disappearance of Ancestral Cascades arc zircon and a substantial increase in Clarno-Challis zircon recycled from underlying forearc strata. The ~15–20 m.y. delay between subduction initiation (ca. 49–46 Ma) and the onset of forearc uplift (ca. 33–30 Ma) supports insights from thermomechanical models that identify tectonic underplating and thermally activated lower-crustal flow as major drivers of deformation and uplift in active forearc regions.

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Lipman, Peter W., Matthew J. Zimmerer, and Amy K. Gilmer. "Early incubation and prolonged maturation of large ignimbrite magma bodies: Evidence from the Southern Rocky Mountain volcanic field, Colorado, USA." Geology, May 9, 2022. http://dx.doi.org/10.1130/g49964.1.

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Clusters of early central volcanoes in the mid-Cenozoic Southern Rocky Mountain volcanic field (SRMVF; southwestern Colorado, USA) record sites of initial magmatic focusing that led to assembly of sizable upper-crustal magma bodies capable of generating large ignimbrites. Peak growth at precursor andesitic volcanoes was followed by extended periods (0.5 to >2 m.y.) of reduced eruptive activity during inferred prolonged incubation of the crustal reservoir prior to eruption of ignimbrites at the San Juan magmatic locus, as exemplified by the 5000 km3 Fish Canyon Tuff and associated La Garita caldera. After a magma system became thermally mature and compositionally evolved, additional large ignimbrites could erupt more rapidly from polycyclic calderas. In contrast, incubation times for smaller ignimbrite magmas, as at Crater Lake, Oregon, were briefer than for San Juan systems. Plutonic counterparts to the temporal-compositional assembly of arc-ignimbrite magmas are exemplified by incrementally emplaced granitoid intrusions like the Mesozoic Tuolumne complex in the Sierra Nevada.

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