Compositional boundary layers trigger liquid unmixing in a basaltic crystal mush

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Honour, V.C.; Holness, M.B.; Charlier, B.; Piazolo, S.C.; Namur, O. et al.: Compositional boundary layers trigger liquid unmixing in a basaltic crystal mush. In: Nature Communications 10 (2019), Nr. 1, 4821. DOI: https://doi.org/10.1038/s41467-019-12694-5

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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.
License of this version: CC BY 4.0 Unported
Document Type: article
Publishing status: publishedVersion
Issue Date: 2019
Appears in Collections:Naturwissenschaftliche Fakultät

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1 image of flag of Germany Germany 29 82.86%
2 image of flag of Switzerland Switzerland 2 5.71%
3 image of flag of Vietnam Vietnam 1 2.86%
4 image of flag of No geo information available No geo information available 1 2.86%
5 image of flag of United States United States 1 2.86%
6 image of flag of China China 1 2.86%

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