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The post-Mazama northwest rift zone eruption at Newberry Volcano, Oregon

Daniele Mckay, Julie M. Donnelly-Nolan, Robert A. Jensen and Duane E. Champion
The post-Mazama northwest rift zone eruption at Newberry Volcano, Oregon (in Volcanoes to vineyards; geologic field trips through the dynamic landscape of the Pacific Northwest, Jim E. O'Connor (editor), Rebecca J. Dorsey (editor) and Ian P. Madin (editor))
Field Guide (Geological Society of America) (December 2009) 15: 91-110

Abstract

The northwest rift zone (NWRZ) eruption took place at Newberry Volcano approximately 7000 years ago after the volcano was mantled by tephra from the catastrophic eruption that destroyed Mount Mazama and produced the Crater Lake caldera. The NWRZ eruption produced multiple lava flows from a variety of vents including cinder cones, spatter vents, and fissures, possibly in more than one episode. Eruptive behaviors ranged from energetic Strombolian, which produced significant tephra plumes, to low-energy Hawaiian-style. This paper summarizes and in part reinterprets what is known about the eruption and presents information from new and ongoing studies. Total distance spanned by the eruption is 32 km north-south. The northernmost flow of the NWRZ blocked the Deschutes River upstream from the city of Bend, Oregon, and changed the course of the river. Renewed mafic activity in the region, particularly eruptions such as the NWRZ with tephra plumes and multiple lava flows from many vents, would have significant impacts for the residents of Bend and other central Oregon communities.


ISSN: 2333-0937
EISSN: 2333-0945
Serial Title: Field Guide (Geological Society of America)
Serial Volume: 15
Title: The post-Mazama northwest rift zone eruption at Newberry Volcano, Oregon
Title: Volcanoes to vineyards; geologic field trips through the dynamic landscape of the Pacific Northwest
Author(s): Mckay, DanieleDonnelly-Nolan, Julie M.Jensen, Robert A.Champion, Duane E.
Author(s): O'Connor, Jim E.editor
Author(s): Dorsey, Rebecca J.editor
Author(s): Madin, Ian P.editor
Affiliation: University of Oregon, Department of Geological Sciences, Eugene, OR, United States
Affiliation: U. S. Geological Survey, Portland, OR, United States
Pages: 91-110
Published: 200912
Text Language: English
Publisher: Geological Society of America, Boulder, CO, United States
References: 24
Accession Number: 2010-060155
Categories: Quaternary geologyIgneous and metamorphic petrology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, geol. sketch map
N43°34'60" - N43°49'60", W121°19'60" - W121°10'00"
Secondary Affiliation: University of Oregon, USA, United StatesOregon Department of Geology and Mineral Industries, USA, United StatesU. S. Geological Survey, USA, United StatesU. S. Forest Service, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data supplied by the Geological Society of America, Boulder, CO, United States
Update Code: 201033
Program Name: USGSOPNon-USGS publications with USGS authors
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