Evidence for two shield volcanoes exposed on the island of Kauai, Hawaii
The island of Kauai has always been interpreted as a single shield volcano, but lavas of previously correlated reversed-to-normal magnetic-polarity transitions on opposite sides of the island differ significantly in isotopic composition. Samples from west Kauai have 87 Sr/ 86 Sr < 0.7037, ϵ Nd ≥ 6.14, and 206 Pb/ 204 Pb > 18.25; samples from east Kauai have 87 Sr/ 86 Sr > 0.7037, ϵ Nd ≤ 6.14, and 206 Pb/ 204 Pb < 18.25. Available data suggest that a younger eastern shield grew on the collapsed flank of an older western one.
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