What is Newberry Volcano? Julie Donnelly-Nolan, USGS Menlo Park CA, Tim Grove, MIT, & Rick Carlson,...
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Transcript of What is Newberry Volcano? Julie Donnelly-Nolan, USGS Menlo Park CA, Tim Grove, MIT, & Rick Carlson,...
![Page 1: What is Newberry Volcano? Julie Donnelly-Nolan, USGS Menlo Park CA, Tim Grove, MIT, & Rick Carlson, Carnegie Institution View of Newberry edifice from.](https://reader036.fdocuments.in/reader036/viewer/2022062322/56649d055503460f949d8599/html5/thumbnails/1.jpg)
What is Newberry Volcano?
Julie Donnelly-Nolan, USGS Menlo Park CA,
Tim Grove, MIT, & Rick Carlson, Carnegie Institution
View of Newberry edifice from the northeast
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view south of the Newberry edifice from Bend, Oregon
Cascades or not? High Lava Plains volcano?
Is it a volcanic field, not a volcano?
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Cascades arcnot equal to Cascade Range
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Newberry Volcano Sited at the Intersection of the Cascadesand the High Lava Plains Magmatic Province
Oregon
Idaho
Montana
Wyoming
Nevada
CaliforniaUtah
Arizona
WashingtonBasalt
Andesite
DaciteRhyolite
< 5 5-10 10-17 Ma
Colored Regions Show Volcanic Deposits Younger than 17 Million Years (Smith and Luedke, 1984)South Sister, Oregon
Diamond Craters
Cascades
Newberry
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ThreeSisters
Newberry margin
Newberry edifice
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Newberry lavascover ~3000 km2
For comparison,MSH
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10 m DEMFocused onNewberry Caldera
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view from Paulina Peak
At least 3 calderas, 300 ka - 80 ka
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View of Paulina Peak from Paulina Lake
Highest point on caldera rim is Paulina Peak atnearly 8000 ft.,~4000 ft. higherthan surroundingterrain
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Slide courtesy of Mike Poland
Medicine Lake volcano
Newberry Volcano
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Newberry Volcano
Medicine Lake volcano
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Geologic Map of Newberry VolcanoBy MacLeod, Sherrod,Chitwood, & Jensen
Qba
Scanned map courtesy of Templeton, Taylor, Giles,& Rowe (WOU, OSU)
~35 mapped Newberry units
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field assistant
& Mazama
Field challenges --
& lots of similar rocks
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The Subduction Contribution
87Sr/86Sr = 0.70317187Os/188Os = 0.1518
87Sr/86Sr = 0.70382187Os/188Os = 0.1922
Sr = 1124 ppm
Sr = 300 ppm
~4% H2O
(Carlson data)
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(Carlson isotope data)
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What is the “Subduction Component”?
(Carlson data)
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He isotope data
Graham, et al.JVGR 2009
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NV
Grove et al. model
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WVF
Figure adapted from B. Jordan PhD thesis
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than HLP rhyolites
Newberry rhyolites are lower in SiO2
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Newberry Volcano
• A subduction-related volcano, not an HLP volcano• Calc-alkaline basalts as well as HAOT-type basalts• Is isotopically like Cascades lavas• Lies behind the arc axis = rear-arc volcano• Extensional terrain; strong magmatic focus• Edifice with central caldera eruptions; not a volcanic field
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Tectonic settingOf Newberry:interaction of tectonism and volcanism akey feature
High Lava Plains
Crater Lake
Mt. Jefferson
WVF
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From Donnelly-Nolan et al., JVGR 2008
Fore-arc, arc axis, & rear-arc volcanoes
Behind-the-arc Quaternaryvolcanism
Interpretation:
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Preliminary version of Newberry geologic mapping will be ondisplay Monday at poster booth 288
View of Newberry edifice from the southeast
Acknowledgments: with thanks to Robert Jensen, Dave Ramsey, Duane Champion,Andy Calvert, Marvin Lanphere, Larry Chitwood