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Biaxial calcite inverted from aragonite

Boettcher, A. L. and Wyllie, P. J. (1967) Biaxial calcite inverted from aragonite. American Mineralogist, 52 (9-10). pp. 1527-1529. ISSN 0003-004X.

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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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Advanced Research Projects Agency (ARPA)SD-89
Issue or Number:9-10
Record Number:CaltechAUTHORS:20160113-151559197
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:63659
Deposited By: Tony Diaz
Deposited On:14 Jan 2016 20:05
Last Modified:03 Oct 2019 09:30

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