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Lead isotopes reveal bilateral asymmetry and vertical continuity in the Hawaiian mantle plume

Author

Listed:
  • W. Abouchami

    (Max-Planck-Institut für Chemie)

  • A. W. Hofmann

    (Max-Planck-Institut für Chemie)

  • S. J. G. Galer

    (Max-Planck-Institut für Chemie)

  • F. A. Frey

    (Massachusetts Institute of Technology)

  • J. Eisele

    (Max-Planck-Institut für Chemie)

  • M. Feigenson

    (Rutgers University)

Abstract

The two parallel chains of Hawaiian volcanoes (‘Loa’ and ‘Kea’) are known to have statistically different but overlapping radiogenic isotope characteristics. This has been explained by a model of a concentrically zoned mantle plume, where the Kea chain preferentially samples a more peripheral portion of the plume. Using high-precision lead isotope data for both centrally and peripherally located volcanoes, we show here that the two trends have very little compositional overlap and instead reveal bilateral, non-concentric plume zones, probably derived from the plume source in the mantle. On a smaller scale, along the Kea chain, there are isotopic differences between the youngest lavas from the Mauna Kea and Kilauea volcanoes, but the 550-thousand-year-old Mauna Kea lavas are isotopically identical to Kilauea lavas, consistent with Mauna Kea's position relative to the plume, which was then similar to that of present-day Kilauea. We therefore conclude that narrow (less than 50 kilometres wide) compositional streaks, as well as the larger-scale bilateral zonation, are vertically continuous over tens to hundreds of kilometres within the plume.

Suggested Citation

  • W. Abouchami & A. W. Hofmann & S. J. G. Galer & F. A. Frey & J. Eisele & M. Feigenson, 2005. "Lead isotopes reveal bilateral asymmetry and vertical continuity in the Hawaiian mantle plume," Nature, Nature, vol. 434(7035), pages 851-856, April.
  • Handle: RePEc:nat:nature:v:434:y:2005:i:7035:d:10.1038_nature03402
    DOI: 10.1038/nature03402
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    Cited by:

    1. Stephan Homrighausen & Kaj Hoernle & Folkmar Hauff & Patrick A. Hoyer & Karsten M. Haase & Wolfram H. Geissler & Jörg Geldmacher, 2023. "Evidence for compositionally distinct upper mantle plumelets since the early history of the Tristan-Gough hotspot," Nature Communications, Nature, vol. 14(1), pages 1-12, December.

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