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GSA Special Papers
Plates, Plumes and Planetary Processes
Author(s)
Geological Society of America

Volume
430
Copyright:
Geological Society of America
ISBN print:
9780813724300
Publication date:
January 01, 2007
Book Chapter
The origin of the Columbia River flood basalt province: Plume versus nonplume models
Author(s)
Peter R. Hooper
Department of Geology, Washington State University, Pullman, Washington 99164, USA, and Open University, Milton Keynes MK7 6AA, UK
;
Peter R. Hooper
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Victor E. Camp
Department of Geological Sciences, San Diego State University, San Diego, California 92182, USA
;
Victor E. Camp
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Stephen P. Reidel
Washington State University Tri-Cities, Richland, Washington 99352, USA
;
Stephen P. Reidel
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Martin E. Ross
Department of Earth and Environmental Sciences, Northeastern University, 360 Huntington Avenue, Boston, Massachusetts 02115, USA
Martin E. Ross
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Published:January 01, 2007
As a contribution to the plume-nonplume debate we review the tectonic setting in which huge volumes of monotonous tholeiite of the Columbia River flood basalt province of the Pacific Northwest, USA, were erupted. We record the timescale and the locations of these eruptions and estimates of individual eruption volumes, and we discuss the mechanisms of sheet-flow emplacement, all of which bear on the ultimate origin of the province. An exceptionally large chemical and isotopic database is used to identify the various mantle sources of the basalt and their subsequent evolution in large lower-crustal magma chambers. We conclude by discussing the...
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Index Terms/Descriptors
- alkaline earth metals
- basalts
- Cenozoic
- Columbia River Basalt Group
- eclogite
- emplacement
- extension tectonics
- flood basalts
- genesis
- geochemistry
- igneous rocks
- isotope ratios
- isotopes
- mantle
- mantle plumes
- metals
- metamorphic rocks
- Miocene
- Nd-144/Nd-143
- neodymium
- Neogene
- rare earths
- Sr-87/Sr-86
- stable isotopes
- stratigraphy
- strontium
- tectonics
- Tertiary
- tholeiite
- United States
- volcanic rocks
- Washington
- Western U.S.
Latitude & Longitude
Citing Books via
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