Abstract
Fourteen whole rock samples were analyzed for 40Ar/39Ar geochronology to determine the timing of an important transition in mantle source geochemistry that occurred on the island of Kaua‘i, located at the junction between the Northwest Hawaiian Ridge and the Hawaiian Islands. Kaua‘i’s shield-stage lavas have lead (Pb) isotopic compositions that change from west to east across the island. Given previous age constraints, it was unclear whether western and eastern portions of the shield were coeval. The new dates from this study range from 4.95 ± 0.19 Ma to 4.02 ± 0.04 Ma, decrease broadly from west to east Kaua‘i, and correlate with Pb isotopic ratios. The results indicate that the transition from Kea to Loa isotopic compositions across Kaua‘i occurred between ~4.7 and 4.4 Ma. The new 40Ar/39Ar geochronological results require a modification of the order of shield-building events for Kaua‘i. The easternmost lavas of the Nāpali Member formed after the westernmost lavas and are unlikely their stratigraphic equivalents, as previously inferred from mapping and structural observations. The easternmost lavas of the Nāpali Member likely represent the final period of shield-stage volcanism on Kaua‘i, which is supported by the location of the residual gravity anomaly beneath the Līhu‘e Basin in eastern Kaua‘i. This work highlights the importance of combining field-based observations with geochemical, isotopic, and geochronological data when assessing the shield-stage evolution of Hawaiian volcanoes.
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Acknowledgements
We thank Jamie Cutts, Lauren Harrison, Corey Wall, and Chuck Blay for the assistance in the field, sample collection, and discussions. Sincere thanks to Dan Miggins at the Argon Geochronology Laboratory, Oregon State University, for sample preparation and guidance during and after the analytical sessions. Thanks also to Anthony Koppers for the discussions about data reliability and to Jamie Cutts for early manuscript reviews. We are grateful for the constructive reviews provided by Fred Jourdan and two anonymous reviewers, and the careful editorial handling provided by Loÿc Vanderkluysen.
Funding
Research was supported by a National Sciences and Engineering Research Council of Canada (NSERC) Discovery Grant to Dominique Weis and a NSERC Collaborative Research and Training Experience Multidisciplinary Applied Geochemistry Network Program scholarship to Nicole Williamson.
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445_2023_1649_MOESM1_ESM.xlsx
Online Resource 1 Sample details of Kaua'i basalts and major element oxide (wt.%) compositions of whole rocks (XLSX 13.1 KB)
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Online Resource 2 Compilation and comparison of shield-stage dates from this and previous studies of basalts from Kaua‘i (organized by volcanic member) (XLSX 133 KB)
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Online Resource 3 Thin section scans (cross-polarized light) of samples dated in this study. Field of view is ~4.5 cm x 2.5 cm for all thin sections and sample names are indicated (2.47 MB)
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Online Resource 4 Metadata, age plateaus, and isochrons for samples analyzed at the Argon Geochronology Laboratory, Oregon State University in 2018 and 2020. OR4 is presented as two Excel files per sample: one contains all details and the other is a one-page summary (ZIP 2.92 MB)
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Williamson, N.M.B., Weis, D., Scoates, J.S. et al. 40Ar/39Ar geochronology of basalts from Kaua‘i, Hawai‘i: implications for shield-stage evolution of Hawaiian volcanoes. Bull Volcanol 85, 37 (2023). https://doi.org/10.1007/s00445-023-01649-w
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DOI: https://doi.org/10.1007/s00445-023-01649-w