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Isotope evidence of a mantle convection boundary at the Australian-Antarctic Discordance

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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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Authors and Affiliations

  1. Lamont-Doherty Geological Observatory and Department of Geological Sciences of Columbia University, Palisades, New York, 10964, USA

    E. M. Klein, C. H. Langmuir, A. Zindler & B. Hamelin

  2. Scripps Institution of Oceanography, La Jolla, California, 92093, USA

    H. Staudigel

  3. Laboratorie de Géochimie et Cosmochimie, 75230, Paris, France

    B. Hamelin

Authors
  1. E. M. Klein
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  2. C. H. Langmuir
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  3. A. Zindler
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  4. H. Staudigel
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  5. B. Hamelin
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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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