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- W2017137218 abstract "We report 40Ar/39Ar stepwise heating ages for basalt samples from three seamounts in the eastern Pacific. The first, Henderson seamount, is located on Pacific lithosphere that is ∼22 Ma old while an alkalic basalt sample dredged from near its summit yields a good age about 7.8 Ma. This suggests that Henderson (not a member of a linear hotspot chain) probably did not form at the East Pacific Rise but rather is an intraplate volcano. Henderson is the first well-dated volcano of this type to be identified in the eastern Pacific. Seamounts 6 and 7 are located on the Cocos Plate upon lithosphere 3–4 Ma old. Samples from these seasmounts yield poor isochrons with individual data points scattering between 0 and 3 Ma. These data are consistent with geologic observations, in-situ magnetic gradiometer measurements and modeling of the total magnetic fields indicating that seamounts 6 and 7 formed near but not on the axis of the East Pacific Rise. The data from Henderson seamount confirm that some isolated volcanoes represent non-hotspot intraplate volcanism as suggested earlier by the abundance and distribution of seamounts." @default.
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- W2017137218 date "1987-01-01" @default.
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- W2017137218 title "Age determinations of eastern Pacific seamounts (Henderson, 6 and 7) — Implications for near-ridge and intraplate volcanism" @default.
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- W2017137218 doi "https://doi.org/10.1016/0025-3227(87)90006-5" @default.
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