Stern, C. R. and Wyllie, P. J. (1973) Water-saturated and undersaturated melting relations of a granite to 35 kilobars. Earth and Planetary Science Letters, 18 (1). pp. 163-167. ISSN 0012-821X. doi:10.1016/0012-821X(73)90052-6. https://resolver.caltech.edu/CaltechAUTHORS:20160122-134940775
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Abstract
Biotite granite from the Sierra Nevada batholith was reacted, with known water contents in sealed platinum capsules, in a piston-cylinder apparatus between 10 and 35 kb. With the liquid just over-saturated with respect to water, temperatures for solidus and liquidus (quartz/coesite-out curve), respectively, are: 2 kb, 680°C, 715°C; 10 kb, 620°C, 725°C; 25 kb, 655°C, 800°C; 35 kb, 700°C, 850°C. The temperature interval is 35°C at 2 kb, 105°C at 10 kb, and 150°C at 35 kb, indicating that granite departs from a eutectic composition at depths greater than about 40–50 km. We conclude that crystal-liquid equilibria are not likely to yield primary rhyolite or granite magmas by partial fusion of oceanic crust in subduction zones. The solubility of water in granite liquids, in wt%, is 22.5 ± 2.5 at 25 kb and 810°C and 27 ± 2.5 at 35 kb and 850°C. These results indicate that a miscibility gap persists between water-saturated silicate magmas and aqueous vapor phase at least to pressures corresponding to 100 km depth in the mantle. The formation of kyanite near the liquidus of water over-saturated granite indicates that the aqueous vapor phase is enriched in alkalis and possibly silica, relative to the condensed phases.
| Item Type: | Article | |||||||||
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| Additional Information: | © 1973 Elsevier B.V. Received 13 December 1972. We thank the National Science Foundation for Grant GA-29426 and the Advanced Research Projects Agency for Grant DAHC-15-67-C-0220, which supported this research, P.C. Bateman and F.C. Dodge for supplying the granite, and A. Irving for a critical review of the manuscript. | |||||||||
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| Issue or Number: | 1 | |||||||||
| DOI: | 10.1016/0012-821X(73)90052-6 | |||||||||
| Record Number: | CaltechAUTHORS:20160122-134940775 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20160122-134940775 | |||||||||
| Official Citation: | C.R. Stern, P.J. Wyllie, Water-saturated and undersaturated melting relations of a granite to 35 kilobars, Earth and Planetary Science Letters, Volume 18, Issue 1, 1973, Pages 163-167, ISSN 0012-821X, http://dx.doi.org/10.1016/0012-821X(73)90052-6. (http://www.sciencedirect.com/science/article/pii/0012821X73900526) | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 63902 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Tony Diaz | |||||||||
| Deposited On: | 22 Jan 2016 22:20 | |||||||||
| Last Modified: | 10 Nov 2021 23:23 |
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