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What is Newberry Volcano?

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. view south of the Newberry edifice from Bend, Oregon. Cascades or not? High Lava Plains volcano?

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What is Newberry Volcano?

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  1. 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

  2. view south of the Newberry edifice from Bend, Oregon Cascades or not? High Lava Plains volcano? Is it a volcanic field, not a volcano?

  3. Cascades arc not equal to Cascade Range

  4. Newberry Volcano Sited at the Intersection of the Cascadesand the High Lava Plains Magmatic Province Colored Regions Show Volcanic Deposits Younger than 17 Million Years (Smith and Luedke, 1984) South Sister, Oregon Cascades Diamond Craters Newberry

  5. Newberry margin Three Sisters Newberry edifice

  6. Newberry lavas cover ~3000 km2 For comparison, MSH

  7. 10 m DEM Focused on Newberry Caldera

  8. view from Paulina Peak At least 3 calderas, 300 ka - 80 ka

  9. Highest point on caldera rim is Paulina Peak at nearly 8000 ft., ~4000 ft. higher than surrounding terrain View of Paulina Peak from Paulina Lake

  10. Newberry Volcano Medicine Lake volcano Slide courtesy of Mike Poland

  11. Newberry Volcano Medicine Lake volcano

  12. Geologic Map of Newberry Volcano By MacLeod, Sherrod, Chitwood, & Jensen Qba ~35 mapped Newberry units Scanned map courtesy of Templeton, Taylor, Giles, & Rowe (WOU, OSU)

  13. Field challenges -- fieldassistant & Mazama & lots of similar rocks

  14. The Subduction Contribution Sr = 1124 ppm ~4% H2O Sr = 300 ppm 87Sr/86Sr = 0.70317 187Os/188Os = 0.1518 87Sr/86Sr = 0.70382 187Os/188Os = 0.1922 (Carlson data)

  15. (Carlson isotope data)

  16. What is the “Subduction Component”? (Carlson data)

  17. He isotope data Graham, et al. JVGR 2009

  18. NV Grove et al. model

  19. WVF Figure adapted from B. Jordan PhD thesis

  20. Newberry rhyolites are lower in SiO2 than HLP rhyolites

  21. 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

  22. Tectonic setting Of Newberry: interaction of tectonism and volcanism a key feature Mt. Jefferson WVF High Lava Plains Crater Lake

  23. Interpretation: Fore-arc, arc axis, & rear-arc volcanoes Behind-the-arc Quaternary volcanism From Donnelly-Nolan et al., JVGR 2008

  24. Preliminary version of Newberry geologic mapping will be on display 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

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