Compositional boundary layers trigger liquid unmixing in a basaltic crystal mush.

Autor:	Honour VC; Department of Earth Sciences, University of Cambridge, Cambridge, CB2 3EQ, UK. vch28@cam.ac.uk., Holness MB; Department of Earth Sciences, University of Cambridge, Cambridge, CB2 3EQ, UK., Charlier B; Department of Geology, University of Liege, 4000, Sart Tilman, Belgium., Piazolo SC; School of Earth and Environment, University of Leeds, Leeds, UK., Namur O; Department of Earth and Environmental Sciences, KU Leuven, 3001, Leuven, Belgium., Prosa TJ; CAMECA Instrument Inc., 5470 Nobel Drive, Madison, WI, USA, 53711., Martin I; CAMECA Instrument Inc., 5470 Nobel Drive, Madison, WI, USA, 53711., Helz RT; United States Geological Survey, MS 926A, Reston, VA, 20192, USA., Maclennan J; Department of Earth Sciences, University of Cambridge, Cambridge, CB2 3EQ, UK., Jean MM; Institut für Mineralogie, Leibniz Universität Hannover, Callinstr. 3, 30167, Hannover, Germany.; Department of Geological Sciences, University of Alaska-Anchorage, 3211 Providence Drive, CPSB 101, Anchorage, AK, 99508, USA.
Jazyk:	angličtina
Zdroj:	Nature communications [Nat Commun] 2019 Oct 23; Vol. 10 (1), pp. 4821. Date of Electronic Publication: 2019 Oct 23.
DOI:	10.1038/s41467-019-12694-5
Abstrakt:	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.
Databáze:	MEDLINE
Externí odkaz:	Zobrazit plný text záznamu