2024
DOI: 10.1073/pnas.2401832121
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Temporal covariation of island arc Sr isotopes and seawater chemistry over the past 2 billion years

Amanda L. Bednarick,
Claire E. Bucholz,
Donald J. DePaolo
et al.

Abstract: The chemical compositions of island arc basalts (IAB) reflect contributions from the mantle as well as fluids and melts from the subducting slab. Addition of radiogenic seawater Sr to oceanic crust through hydrothermal alteration and subsequent subduction is often invoked to explain elevated 87 Sr/ 86 Sr signatures in modern IAB. However, changes in the 87 Sr/ 86 Sr of island arc magmatic rocks through time has not … Show more

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