Robin T. Holcomb, Peter W. Reiners, Bruce K. Nelson, Nuni-Lyn E. Sawyer; Evidence for two shield volcanoes exposed on the island of Kauai, Hawaii. Geology ; 25 (9): 811–814. doi: https://doi.org/10.1130/0091-7613(1997)025<0811:EFTSVE>2.3.CO;2
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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 87Sr/86Sr < 0.7037, ϵNd ≥ 6.14, and 206Pb/204Pb > 18.25; samples from east Kauai have 87Sr/86Sr > 0.7037, ϵNd ≤ 6.14, and 206Pb/204Pb < 18.25. Available data suggest that a younger eastern shield grew on the collapsed flank of an older western one.