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Published September 1968 | public
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Jadeite stability measured in the presence of silicate liquids in the system NaAlSiO_4-SiO_2-H_2O

Boettcher, A. L.
Wyllie, P. J.
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Abstract

The reactions nepheline + high albite ⇋ Jadeite and high albite ⇌ Jadeite + quartz were measured in the presence of high-pressure vapors and silicate melts in the system NaAlSiO_4-SiO_2-H_2O for the temperature range 600–800°C. Kinetics were such that complete reaction was attained in most runs. The results of these determinations together with previous studies in this system and recent thermochemical data collectively place narrow restrictions on the positions of the above reactions over a wide temperature range. An entropy change of 3.5 eu accompanying the transformation of low to high albite is in good agreement with these results. Some data are also provided for the reaction analcite + high albite ⇋ Jadeite + vapor. It is concluded that Jadeite can form in a variety of geologic environments at pressures lower than previously determined.

Additional Information

© 1968 Published by Elsevier Ltd. Received 6 January 1968, Accepted 16 April 1968, Available online 3 April 2003. Most of this work was supported at The University of Chicago by National Science Foundation Grant GA-923, using apparatus supplied by Advanced Research Projects Agency Contract SD-89. Part of the publications costs and some experimental work was supported by National Science Foundation Grant GA-1364 at The Pennsylvania State University. We thank R. C. NEWTON and J. V. SMITH for helpful discussion and for review of a part of the manuscript. We are grateful to O. J. KLEPPA of The University of Chicago for allowing us the use of unpublished data.

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