Microstructural evolution of silicate immiscible liquids in ferrobasalts

Honour, Victoria C. and Holness, Marian B. and Partridge, Jamie L. and Charlier, Bernard (2019) Microstructural evolution of silicate immiscible liquids in ferrobasalts. Contributions to Mineralogy and Petrology, 174 (9). ISSN 0010-7999 DOI https://doi.org/10.1007/s00410-019-1610-6

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Official URL: https://doi.org/10.1007/s00410-019-1610-6

Abstract

An experimental study of the microstructural evolution of an immiscible basaltic emulsion shows that the Fe-rich liquid forms homogeneously nucleated droplets dispersed in a continuous Si-rich liquid, together with droplets heterogeneously nucleated on plagioclase, magnetite, and pyroxene. Heterogeneous nucleation is likely promoted by localised compositional heterogeneities around growing crystals. The wetting angle of Fe-rich droplets on both plagioclase and magnetite increases with decreasing temperature. Droplet coarsening occurs by a combination of diffusion-controlled growth and Ostwald ripening, with an insignificant contribution from coalescence. Characteristic microstructures resulting from the interaction of immiscible Fe-rich liquid with crystal grains during crystal growth can potentially be used as an indicator of liquid unmixing in fully crystallised natural samples. In magma bodies < ~ 10 m in size, gravitationally driven segregation of immiscible Fe-rich droplets is unlikely to be significant.

Item Type: Article
Uncontrolled Keywords: 2019AREP; IA75
Subjects: 05 - Petrology - Igneous, Metamorphic and Volcanic Studies
Divisions: 05 - Petrology - Igneous, Metamorphic and Volcanic Studies
07 - Gold Open Access
12 - PhD
Journal or Publication Title: Contributions to Mineralogy and Petrology
Volume: 174
Identification Number: https://doi.org/10.1007/s00410-019-1610-6
Depositing User: Sarah Humbert
Date Deposited: 14 Nov 2019 18:34
Last Modified: 15 Nov 2019 11:51
URI: http://eprints.esc.cam.ac.uk/id/eprint/4520

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