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Liquid immiscibility in a nephelinite–carbonate system at 25 kbar and implications for carbonatite origin

Baker, Michael B. and Wyllie, Peter J. (1990) Liquid immiscibility in a nephelinite–carbonate system at 25 kbar and implications for carbonatite origin. Nature, 346 (6280). pp. 168-170. ISSN 0028-0836. doi:10.1038/346168a0.

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Mantle-derived carbonate-rich melts may have an important role in mantle metasomatism, and may serve as parent liquids for crustal carbonatite magmas. Experiments have shown that carbonatitic melts can be produced by partial melting of peridotite + CO_2 + H_2O above 22 kbar (ref. 3), and that silicate and carbonate liquids are immiscible between 2 and 15 kbar for a wide range of Ca/Na ratios. We have determined the extent of silicate-carbonate liquid immiscibility at 25 kbar and 1,050–1,300°C using mixtures of magnesian nephelinite, dolomite and sodium carbonate with and without water. In contrast to the low-pressure data, the two-liquid field at 25 kbar is restricted to more sodium-rich compositions, far removed from natural mantle melts. Our experimental results suggest that neither partial melting of carbonated peridotite, nor extensive fractional crystallization of silicate magmas at depths corresponding to 25 kbar, are likely to generate carbonatitic magmas by liquid immiscibility.

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Additional Information:© 1990 Nature Publishing Group. Received 20 December 1989; accepted 11 May 1990. We thank D. H. Green and J. Gittins for reviews. This research was supported by the NSF.
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Issue or Number:6280
Record Number:CaltechAUTHORS:20150512-100226476
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:57445
Deposited By: Tony Diaz
Deposited On:12 May 2015 17:28
Last Modified:10 Nov 2021 21:50

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