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Melting relations of NaAlSi_3O_8 to 30 Kb in the presence of H_2O:CO_2 = 50:50 vapor

Millhollen, G. L. and Wyllie, P. J. and Burnham, C. Wayne (1971) Melting relations of NaAlSi_3O_8 to 30 Kb in the presence of H_2O:CO_2 = 50:50 vapor. American Journal of Science, 271 (5). pp. 473-480. ISSN 0002-9599. doi:10.2475/ajs.271.5.473.

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Synthetic albite was reacted with oxalic acid dihydrate under oxidizing conditions in an internally-heated pressure vessel from 1 to 4 kb and in a piston-cylinder apparatus from 10 to 30 kb. Breakdown of the oxalic acid in subsolidus runs produced a vapor with H_2O:CO_2 = 50:50 in moles (X^v_(H_2O) = 0.5, neglecting solubility of solids in the vapor). The curve determined for the beginning of melting under these conditions defines a contour on the divariant solidus surface for the system NaAlSi_3O_8-H_2O-CO_2 for X^v_(H_2O) = 0.5, between the published limits for X^v_(H_2O) = 1.0 and X^v_(H_2O) = O. Addition of 50 mole percent of relatively insoluble CO_2 to NaAlSi_3O_8-H_2O at 15 kb total pressure raises the solidus temperature from 660° to 830°C. The results give no indication of increased solubility of CO_2 in NaAlSi_3O_8 liquids at pressures above 15 kb, in contrast with published results for a basalt liquid.

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Alternate Title:Melting relations of NaAlSi3O8 to 30 Kb in the presence of H2O:CO2 = 50:50 vapor
Additional Information:© 1971 American Journal of Science. We thank the National Science Foundation for support from grants GA-15718 and GA-1110, the Advanced Research Products Agency for the piston-cylinder apparatus, Dr. J. K. Robertson for helpful discussions during the course of the experiments, and Drs. A. L. Boettcher and R. C. Newton for critical reviews of the manuscript.
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Issue or Number:5
Record Number:CaltechAUTHORS:20160127-144713306
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Official Citation:G. L. Millhollen, P. J. Wyllie, and C. Wayne Burnham Melting relations of NaAlSi 3 O 8 to 30 Kb in the presence of H 2 O:CO 2 = 50:50 vapor Am J Sci December 1, 1971 271:473-480; doi:10.2475/ajs.271.5.473
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:64025
Deposited By: Tony Diaz
Deposited On:27 Jan 2016 23:14
Last Modified:10 Nov 2021 23:24

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