Timing and duration of volcanism in the Columbia River Basalt Group: A review of existing radiometric data and new constraints on the age of the Steens through Wanapum Basalt extrusion
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Published:August 01, 2013
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CiteCitation
Ajoy K. Baksi, 2013. "Timing and duration of volcanism in the Columbia River Basalt Group: A review of existing radiometric data and new constraints on the age of the Steens through Wanapum Basalt extrusion", The Columbia River Flood Basalt Province, Stephen P. Reidel, Victor E. Camp, Martin E. Ross, John A. Wolff, Barton S. Martin, Terry L. Tolan, Ray E. Wells
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The radiometric dating evidence for the timing and duration of volcanism for the Steens through Wanapum Basalt of the Columbia River Basalt Group is critically reviewed here. K-Ar dates generally underestimate the age of crystallization, though one important exception is detected, where excess argon led to dates that were too old. The 40Ar/39Ar results on whole-rock basalts from 1980 through 2010 are examined for statistical validity of plateau sections, as well as alteration state of the material dated. In most instances, listed ages are shown to be invalid. The 40Ar/39Ar total gas (fusion) ages...
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Contents
The Columbia River Flood Basalt Province

GeoRef
- absolute age
- Ar/Ar
- Cenozoic
- chronology
- Columbia River Basalt Group
- correlation
- dates
- feldspar group
- framework silicates
- Grande Ronde Basalt
- Idaho
- K/Ar
- Miocene
- Neogene
- Oregon
- Pasco Basin
- plagioclase
- silicates
- Tertiary
- United States
- volcanism
- Wanapum Basalt
- Washington
- whole rock
- Imnaha Basalt
- Steens Basalt
- Malheur Gorge