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Compositional boundary layers trigger liquid unmixing in a basaltic crystal mush

Author

Listed:
  • Victoria C. Honour

    (University of Cambridge)

  • Marian B. Holness

    (University of Cambridge)

  • Bernard Charlier

    (University of Liege)

  • Sandra C. Piazolo

    (University of Leeds)

  • Olivier Namur

    (KU Leuven)

  • Ty J. Prosa

    (CAMECA Instrument Inc.)

  • Isabelle Martin

    (CAMECA Instrument Inc.)

  • Rosalind T. Helz

    (United States Geological Survey, MS 926A)

  • John Maclennan

    (University of Cambridge)

  • Marlon M. Jean

    (Institut für Mineralogie, Leibniz Universität Hannover
    University of Alaska-Anchorage)

Abstract

The separation of immiscible liquids has significant implications for magma evolution and the formation of magmatic ore deposits. We combine high-resolution imaging and electron probe microanalysis with the first use of atom probe tomography on tholeiitic basaltic glass from Hawaii, the Snake River Plain, and Iceland, to investigate the onset of unmixing of basaltic liquids into Fe-rich and Si-rich conjugates. We examine the relationships between unmixing and crystal growth, and the evolution of a nanoemulsion in a crystal mush. We identify the previously unrecognised role played by compositional boundary layers in promoting unmixing around growing crystals at melt-crystal interfaces. Our findings have important implications for the formation of immiscible liquid in a crystal mush, the interpretations of compositional zoning in crystals, and the role of liquid immiscibility in controlling magma physical properties.

Suggested Citation

  • Victoria C. Honour & Marian B. Holness & Bernard Charlier & Sandra C. Piazolo & Olivier Namur & Ty J. Prosa & Isabelle Martin & Rosalind T. Helz & John Maclennan & Marlon M. Jean, 2019. "Compositional boundary layers trigger liquid unmixing in a basaltic crystal mush," Nature Communications, Nature, vol. 10(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:10:y:2019:i:1:d:10.1038_s41467-019-12694-5
    DOI: 10.1038/s41467-019-12694-5
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    Cited by:

    1. Adrian J. Hornby & Paul M. Ayris & David E. Damby & Spyridon Diplas & Julia Eychenne & Jackie E. Kendrick & Corrado Cimarelli & Ulrich Kueppers & Bettina Scheu & James E. P. Utley & Donald B. Dingwell, 2024. "Nanoscale silicate melt textures determine volcanic ash surface chemistry," Nature Communications, Nature, vol. 15(1), pages 1-10, December.

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