Boettcher, A. L. and Wyllie, P. J. (1967) Biaxial calcite inverted from aragonite. American Mineralogist, 52 (9-10). pp. 1527-1529. ISSN 0003-004X. https://resolver.caltech.edu/CaltechAUTHORS:20160113-151559197
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Abstract
We have recently extended the phase relationships involving a liquid phase in the system CaO-CO_2-H_2O from 4 kilobars pressure (Wyllie and Tuttle, 1960; Wyllie and Raynor, 1965) to 40 kilobars pressure (to be published). Under appropriate conditions the phase assemblage calcite+liquid+vapor undergoes a transition to aragonite+liquid+vapor. Published data indicate that the calcite-aragonite transition curve should intersect the ternary univariant solidus curve at about 580°C at a pressure between 11.5 and 13 kilobars. At temperatures above 600°C, BeIl and England (1964) concluded that the aragonite which formed stably within a wide pressure interval inverted to calcite during the quench. Thus, quenching problems have apparently contributed to the conflicting reports for the position of the calcite-aragonite phase transition. Examination of the morphology of the carbonate in the quenched assemblage CaCO_3+liquid+vapor suggested a method for locating the calcite-aragonite transition boundary regardless of the polymorphic changes that may occur during the quench.
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Additional Information: | © 1967 Mineralogical Society of America. We wish to thank R. C. Newton for advice in the use of piston-and-cylinder high-pressure apparatus. This note was read critically by R. C. Newton and J. V. Smith. The work was supported by National Science Foundation Grant GP-4910, and by Advanced Research Projects agency Contract SD-89. | ||||||
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Issue or Number: | 9-10 | ||||||
Record Number: | CaltechAUTHORS:20160113-151559197 | ||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20160113-151559197 | ||||||
Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | ||||||
ID Code: | 63659 | ||||||
Collection: | CaltechAUTHORS | ||||||
Deposited By: | Tony Diaz | ||||||
Deposited On: | 14 Jan 2016 20:05 | ||||||
Last Modified: | 03 Oct 2019 09:30 |
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