Abstract
Basalts from the Southeast Indian Ridge south of Australia form two geographically and isotopically distinct groups that show affinities with either Indian Ocean or Pacific/Atlantic Ocean isotope compositions. The data raise the possibility that there is a sharp boundary between the Indian and Pacific Ocean isotope provinces. The isotope boundary occurs over less than 200km within the Australian–Antarctic Discordance, a technically complex region believed to overlie a zone of downwelling mantle flow.
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Klein, E., Langmuir, C., Zindler, A. et al. Isotope evidence of a mantle convection boundary at the Australian-Antarctic Discordance. Nature 333, 623–629 (1988). https://doi.org/10.1038/333623a0
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DOI: https://doi.org/10.1038/333623a0
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