Volcanoes to Vineyards

This volume contains guides for 33 geological field trips offered in conjunction with the October 2009 GSA Annual Meeting in Portland, Oregon. Showcasing the region’s geological diversity, the peer-reviewed papers included here span topics ranging from accreted terrains and mantle plumes to volcanoes, floods, and vineyard terroir. Locations visited throughout Oregon, Washington, and Idaho encompass Astoria to Zillah. More than just a series of maps, the accompanying descriptions, observations, and conclusions offer new insights to the geologic processes and history of the Pacific Northwest insights that will inspire readers to put their boots on the evidence (or perhaps sip it from a glass of Pinot!) as they develop their own understanding of this remarkable and dynamic corner of the world.
Paleogene calderas of central and eastern Oregon: Eruptive sources of widespread tuffs in the John Day and Clarno Formations
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Published:January 01, 2009
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CiteCitation
Jason D. McClaughry, Mark L. Ferns, Martin J. Streck, Karyn A. Patridge, Caroline L. Gordon, 2009. "Paleogene calderas of central and eastern Oregon: Eruptive sources of widespread tuffs in the John Day and Clarno Formations", Volcanoes to Vineyards, Jim E. O’Connor, Rebecca J. Dorsey, Ian P. Madin
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ABSTRACT
The John Day Formation of central and eastern Oregon, contains a widespread assemblage of both ash-flow and airfall tuffs, yet only a few corresponding caldera sources have been identified in the region. Investigators have long speculated on the sources of tuffs in the John Day Formation and have suggested that these pyroclastic rocks were vented from now buried eruptive centers in or marginal to a nascent Cascade Range. Recent detailed geologic mapping in the John Day and Clarno Formations, however, indicates the presence of at least three large-scale rhyolite caldera complexes centered along the northeast-trending axis of the Blue...
- Basin and Range Province
- Blue Mountains
- calderas
- Cenozoic
- Clarno Formation
- Crook County Oregon
- Eocene
- eruptions
- field trips
- geochemistry
- Grant County Oregon
- guidebook
- igneous rocks
- John Day Formation
- North America
- Oregon
- Paleogene
- provenance
- pyroclastics
- rhyolite tuff
- road log
- Tertiary
- tuff
- Umatilla County Oregon
- United States
- volcanic features
- volcanic rocks
- volcanism
- whole rock
- central Oregon
- eastern Oregon