Microstructural evolution of silicate immiscible liquids in ferrobasalts
Contributions to Mineralogy and Petrology
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Honour, V., Holness, M., Partridge, J., & Charlier, B. (2019). Microstructural evolution of silicate immiscible liquids in ferrobasalts. Contributions to Mineralogy and Petrology, 174 (9)https://doi.org/10.1007/s00410-019-1610-6
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.
External DOI: https://doi.org/10.1007/s00410-019-1610-6
This record's URL: https://www.repository.cam.ac.uk/handle/1810/296026
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