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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Atlantic Ocean
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North Atlantic (1)
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Europe
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Southern Europe
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Italy
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Campania Italy
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Phlegraean Fields (1)
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United States
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Atlantic Coastal Plain
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Central Atlantic Coastal Plain (1)
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Idaho (1)
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Oregon (1)
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Washington (1)
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geochronology methods
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Ar/Ar (3)
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paleomagnetism (1)
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geologic age
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Cenozoic
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Quaternary
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Pleistocene
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upper Pleistocene (1)
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Tertiary
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Neogene
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Miocene
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Columbia River Basalt Group (1)
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Grande Ronde Basalt (1)
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Picture Gorge Basalt (1)
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Saddle Mountains Basalt (1)
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Wanapum Basalt (1)
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Mesozoic
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Jurassic
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Lower Jurassic (1)
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igneous rocks
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igneous rocks
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plutonic rocks
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diabase (1)
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volcanic rocks
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basalts (2)
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pyroclastics
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tuff (1)
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minerals
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silicates
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framework silicates
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feldspar group
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alkali feldspar
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sanidine (1)
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plagioclase (1)
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Primary terms
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absolute age (3)
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Atlantic Ocean
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North Atlantic (1)
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Cenozoic
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Quaternary
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Pleistocene
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upper Pleistocene (1)
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Tertiary
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Neogene
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Miocene
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Columbia River Basalt Group (1)
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Grande Ronde Basalt (1)
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Picture Gorge Basalt (1)
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Saddle Mountains Basalt (1)
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Wanapum Basalt (1)
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Europe
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Southern Europe
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Italy
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Campania Italy
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Phlegraean Fields (1)
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igneous rocks
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plutonic rocks
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diabase (1)
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volcanic rocks
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basalts (2)
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pyroclastics
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tuff (1)
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intrusions (1)
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Mesozoic
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Jurassic
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Lower Jurassic (1)
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paleomagnetism (1)
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United States
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Atlantic Coastal Plain
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Central Atlantic Coastal Plain (1)
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Idaho (1)
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Oregon (1)
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Washington (1)
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Evidence for a large-magnitude eruption from Campi Flegrei caldera (Italy) at 29 ka
Eruption chronology of the Columbia River Basalt Group
The Columbia River flood basalt province, United States, is likely the most well-studied, radiometrically well-dated large igneous province on Earth. Compared with older, more-altered basalt in flood basalt provinces elsewhere, the Columbia River Basalt Group presents an opportunity for precise, accurate ages, and the opportunity to study relationships of volcanism with climatic excursions. We critically assess the available 40 Ar/ 39 Ar data for the Columbia River Basalt Group, along with K-Ar data, to establish an up-to-date picture of the timing of emplacement of the major formations that compose the lava stratigraphy. Combining robust Ar-Ar data with field constraints and paleomagnetic information leads to the following recommendations for the age of emplacement of the constituent formations: Steens Basalt, ca. 16.9 to ca. 16.6 Ma; Imnaha Basalt, ca. 16.7 to ca. 16 Ma; Grande Ronde Basalt, ca. 16 Ma to ca. 15.6 Ma; Wanapum Basalt, ca. 15.6 to ca. 15 Ma; and Saddle Mountains Basalt from ca. 15 Ma to ca. 6 Ma. The results underline the previously held observation that Columbia River Basalt activity was dominated by a brief, voluminous pulse of lava production during Grande Ronde Basalt emplacement. Under scrutiny, the data highlight areas of complexity and uncertainty in the timing of eruption phases, and demonstrate that even here in the youngest large igneous province, argon dating cannot resolve intervals and durations of eruptions.