What is Newberry Volcano?

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Presentation transcript:

What is Newberry Volcano? View of Newberry Volcano from the northeast. Julie Donnelly-Nolan, USGS Menlo Park CA, Tim Grove, MIT, & Rick Carlson, Carnegie Institution View of Newberry edifice from the northeast

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

Cascades arc not equal to Cascade Range

Newberry Volcano Sited at the Intersection of the Cascades and 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

Newberry margin Three Sisters Newberry edifice

Newberry lavas cover ~3000 km2 For comparison, MSH

10 m DEM Focused on Newberry Caldera

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

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

Newberry Volcano Medicine Lake volcano Slide courtesy of Mike Poland

Newberry Volcano Medicine Lake volcano

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)

Field challenges -- field assistant & Mazama & lots of similar rocks

The Subduction Contribution Sr = 1124 ppm Just to show what type of normalized incompatible element patterns go with the extremes of major element composition. ~4% H2O Sr = 300 ppm 87Sr/86Sr = 0.70317 187Os/188Os = 0.1518 87Sr/86Sr = 0.70382 187Os/188Os = 0.1922 (Carlson data)

(Carlson isotope data) 15

What is the “Subduction Component”? Just to make the point that the sediment component has 87Sr/86Sr of about 0.7037. Can’t have a big component of old sediment. (Carlson data) 16

He isotope data Graham, et al. JVGR 2009

NV Grove et al. model

WVF Figure adapted from B. Jordan PhD thesis

Newberry rhyolites are lower in SiO2 than HLP rhyolites

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

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

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

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