PhD proposal

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Spatial Analysis of Cinder Cone Distribution at
Newberry Volcano, Oregon Implications for
Structural Control on Eruptive Process
Steve Taylor and Jeff Templeton Earth and
Physical Sciences Department Western Oregon
University Monmouth, Oregon 97361
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INTRODUCTION
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History of Newberry Work at Western Oregon
University
2001 Friends of the Pleistocene Field Trip to
Newberry Volcano 1999-Present WOU Geology Class
Field Trips and Contextual Learning
Modules 2002 Cinder Cone Volume and
Morphometric Analysis I (GSA Meeting?) 2003-2004
Geochemical Analysis of Teepee Draw and East Side
Tuffs 2003-Present Spatial Analysis of Cinder
Cone Distribution I (GSA Meeting??) 2004-Present
Cinder Cone Morphometric and Spatial Analyses II
(GSA Cordilleran?) 2004-Present Funded Reseach
Spatial Distribution of Invasive Plants (OCF)
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PHYSIOGRAPHIC SETTING
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Newberry Volcano, South View from Lava Butte
Lookout
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• Newberry By The Numbers
• 400 cinder cones
• xxx fissure vents
• - Age lt 500,000 yrs old
• list some radio C dates
• Total Area 15,000 sq km
• Central Caldera xxx sq km
• Composition
• Other Interesting Facts

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Good photo not bad
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Geologic Setting
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Geology after Walker and MacLeod (1991)
Isochrons in 1 m.y. increments (after MacLeod and
others, 1976)
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Central Pumice Cone 7200 yrs BP
East Lake
Big Obsidian Flow 1250 yrs BP
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Interlake Obsidian Flow 7100 yrs BP
Paulina Lake
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Newberry Summit Caldera
Outcrop of East Side Tuffs
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Plate Tectonic Setting
Cascade Volcanic Arc

• Linear chain of volcanoes extending from southern
  British Columbia through Washington and Oregon
  into northern California

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• Volcanoes related to Cascadia Subduction Zone
• Juan de Fuca plate thrust beneath North American
  plate

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Magma source in subduction zone
Arc Migration
Fore Arc
Back Arc
High Cascades
Newberry Position
Western Cascades
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Mt. Mazama / Crater Lake Eruptive Event(50
cubic kilometers of magma, 7630 calendar years
B.P.)
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Climactic Eruption

• Single vent phase
• Plinian eruption column
• Ash-flow tuff from column collapse
• Ring-vent phase
• Coincided with caldera collapse

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Deposits from Single Vent Phase
0.5 1.0 m of ash and pumice fall deposits on
south and west flank of Newberry
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Lava Butte Cone and Aa Flow 7000 yrs BP (post
Mazama)
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Map of Lava Butte Flow
Deschutes River
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GEOMORPHIC ANALYSIS
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Cone photo not bad
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Methodology

• GIS analysis of USGS 10-m DEMs
• Software ArcGIS and Terrain Analysis System (TAS
  v1.5 Lindsay, 2002)
• Subbasin boundaries and channel network derived
  by the Coastal Landscape Analysis and Modeling
  (CLAMS) group at PNW Forest Research Lab (Miller
  et al., 2001)

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SUMMARY AND CONCLUSION
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Future Worklist ideas for REU proposal
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ACKNOWLEDGMENTS
Funding Sources Center for Water and
Environmental Sustainability (CWEST) USGS Water
Resources Small-Grants Program Oregon Community
Foundation Western Oregon University Faculty
Development Fund WOU Student Research
Assistants Diane Hale, Jeff Budnick, Jamie
Fisher, Chandra Drury