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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Oceania
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Micronesia
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Mariana Islands (1)
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-
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United States
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Idaho (1)
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Oregon (2)
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Washington (2)
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-
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elements, isotopes
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isotope ratios (3)
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isotopes
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stable isotopes
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Hf-177/Hf-176 (1)
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Nd-144/Nd-143 (1)
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Sr-87/Sr-86 (2)
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metals
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alkaline earth metals
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strontium
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Sr-87/Sr-86 (2)
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hafnium
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Hf-177/Hf-176 (1)
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rare earths
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neodymium
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Nd-144/Nd-143 (1)
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-
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geologic age
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Cenozoic
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Tertiary
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Neogene
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Miocene
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Columbia River Basalt Group (2)
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Grande Ronde Basalt (1)
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Saddle Mountains Basalt (1)
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Wanapum Basalt (1)
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-
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igneous rocks
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igneous rocks
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volcanic rocks
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andesites (1)
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basalts
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flood basalts (2)
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ocean-island basalts (1)
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-
-
-
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minerals
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oxides
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rutile (1)
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phosphates
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monazite (1)
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silicates
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framework silicates
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feldspar group
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plagioclase (2)
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-
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orthosilicates
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nesosilicates
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zircon group
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zircon (1)
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-
-
-
-
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Primary terms
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Cenozoic
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Tertiary
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Neogene
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Miocene
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Columbia River Basalt Group (2)
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Grande Ronde Basalt (1)
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Saddle Mountains Basalt (1)
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Wanapum Basalt (1)
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-
-
-
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crust (1)
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geochemistry (2)
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igneous rocks
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volcanic rocks
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andesites (1)
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basalts
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flood basalts (2)
-
ocean-island basalts (1)
-
-
-
-
isotopes
-
stable isotopes
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Hf-177/Hf-176 (1)
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Nd-144/Nd-143 (1)
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Sr-87/Sr-86 (2)
-
-
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lava (1)
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magmas (3)
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mantle (1)
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metals
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alkaline earth metals
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strontium
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Sr-87/Sr-86 (2)
-
-
-
hafnium
-
Hf-177/Hf-176 (1)
-
-
rare earths
-
neodymium
-
Nd-144/Nd-143 (1)
-
-
-
-
Oceania
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Micronesia
-
Mariana Islands (1)
-
-
-
sediments
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marine sediments (1)
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-
United States
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Idaho (1)
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Oregon (2)
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Washington (2)
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-
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sedimentary rocks
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volcaniclastics (1)
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-
sediments
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sediments
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marine sediments (1)
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volcaniclastics (1)
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Newly generated and previously published strontium isotope signatures of plagioclase phenocrysts in Columbia River Basalt Group lavas exhibit heterogeneity largely imposed by mantle-derived magmas assimilating variable crustal rocks. Steens basalts assimilated accreted terrane crust with 87 Sr/ 86 Sr ratios of <0.7040. In contrast, Imnaha, Grande Ronde, Wanapum, and Saddle Mountains basalts likely assimilated crust with more radiogenic Sr (>0.7040) including a cratonic component, perhaps as a result of residence in magma chambers partly located east of the 87 Sr/ 86 Sr = 0.7060 line. Strontium isotope ratios in plagioclase phenocrysts from early- erupted Imnaha basalts anticipate whole-rock signatures of later-erupted Grande Ronde basalts consistent with a geochemical continuum between the two formations, which is also seen in whole-rock trace element abundances, undermining the notion of an abrupt change in the magma sources generating Imnaha and Grande Ronde basalts.