Tumalo Volcanic Center
{{Use mdy dates|date=January 2023}}
{{Short description|Source of large-volume Pleistocene ashflows in Oregon, United States}}
{{Infobox mountain
| name = Tumalo Volcanic Center
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| elevation_ft = 1955
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| location =
| range = Cascade Range
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| coordinates = {{coord|44.099|N|121.541|W|type:mountain_region:US-OR_scale:100000_source:NGS|format=dms|display=inline,title}}
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| age = More than 500,000 years{{Cite web |last=Ross |first=Erin |title=Oregon Public Broadcasting |url=https://www.opb.org/news/article/bend-oregon-tumalo-volcano-eruption/ |website=Oregon Public Broadcasting}}
| volcanic_arc = Cascade Volcanic Arc
| last_eruption = Pleistocene
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The Tumalo volcanic center of Central Oregon is viewed as a source of large-volume Pleistocene ashflows, in the US state of Oregon.{{Cite web |title=Smithsonian |url=https://volcano.si.edu/volcano.cfm?vn=322810}}
The eruption, ashflows included
How big was the volcanic eruption? Imagine a cube of lava, one that's {{convert|1.5|mi|km}} long by {{convert|1.5|mi|km}} wide by {{convert|1.5|mi|km}} high.
Ashflows include
- Desert Spring Tuff,
- Bend Pumice
- Tumalo Tuff, and
- Shevlin Park Tuff.
The area has many rhyolitic domes, such as Melvin Butte, plus andesitic cinder cones, including those of the Triangle Hill and Triangle Peak area, whose composition is similar to the Tumalo Tuff (and Bend Pumice), and Shevlin Park Tuff.
This area has andesitic and mafic cinder cones, such as Lava Butte.*{{cite book |last=Harris |first=S. L. |title=Fire Mountains of the West: The Cascade and Mono Lake Volcanoes |publisher=Mountain Press Publishing Company |location=Missoula, Montana |year=2005 |edition=Third |chapter=Chapter 13: The Three Sisters |isbn=978-0-87842-511-2 |page=33}} and rhyolite domes.{{cite book |last1=Plummer |first1=Charles C. |last2=McGeary |first2=David |year=1988 |title=Physical Geology |edition=4th |location=Dubuque, Iowa |publisher=Wm. C. Brown Publishers |isbn=978-0-697-05092-2 |page=54}} Viscous rhyolite domes extruded to the surface.{{cite web |author=Faculty of the School of Geography, Geology and Environmental Science |title=Rhyolite |url=https://flexiblelearning.auckland.ac.nz/rocks_minerals/rocks/rhyolite.html |year=2006 |publisher=The University of Auckland |access-date=2017-11-29 |ref={{harvid|Faculty of the School of Geography|2006}}}}
Ways the Tumalo Volcanic Center's ashflows have been used
The Tumalo Volcanic Center's ashy pumice was quarried for concrete. This concrete effectively built the city of Bend, Oregon
Pumice from the Tumalo Volcanic Center composes Oregon State University–Cascades's expansion, into a pumice mine.{{Cite web |last=Klemetti |first=Erik |date=July 31, 2019 |title=The Hidden Volcanoes of Central Oregon |url=https://www.discovermagazine.com/planet-earth/the-hidden-volcanoes-of-central-oregon}}
See also
External links and references
- [https://www.volcanocafe.org/the-volcanoes-of-the-three-sisters-area-oregon/ Volcanocafe, has information about the Tumalo Volcanic Center]
- [https://ui.adsabs.harvard.edu/abs/2020AGUFMV009...08V/abstract Information on Tumalo Volcanic Center's vent]