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The pressure dependence of the dehydration of gypsum to bassanite

Published online by Cambridge University Press:  05 July 2018

J. D. C. McConnell ,
D. M. Astill  and
P. L. Hall
J. D. C. McConnell
Affiliation:
Schlumberger Cambridge Research, P.O. Box 153, Cambridge, CB3 0HG, U.K.
D. M. Astill
Affiliation:
Schlumberger Cambridge Research, P.O. Box 153, Cambridge, CB3 0HG, U.K.
P. L. Hall
Affiliation:
Schlumberger Cambridge Research, P.O. Box 153, Cambridge, CB3 0HG, U.K.
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Abstract

A new experimental determination of the stability relationships for the dehydration of gypsum to the hemihydrate mineral bassanite at elevated temperature and pressure is described. The experimental method used depends on the observation of very small changes in pressure on the onset of reaction due to the potential volume change in the reaction. The technique yields P-T data of very high precision for this dehydration reaction, and the method is likely to be of use for other reactions. The experimental P-T results have been compared with those calculated from existing thermodynamic data for this reaction.

Keywords

gypsumbassanitedehydration
Type
Mineralogy
Information
Mineralogical Magazine , Volume 51 , Issue 361 , September 1987 , pp. 453 - 457
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1987

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References

Burnham, C.W., Holloway, J.R., and Davis, N.F. (1969) Special PaperNo. 132, Geological Society of America.Google Scholar
Fyfe, W.S. (1958) Am. J. Sci. 256, 729-32.CrossRefGoogle Scholar
Hall, P.L., Astill, D.M., and McConnell, J.D.C. (1986) Clay Minerals, 21, 633-48.CrossRefGoogle Scholar
Heard, H.C. and Rubey, W.W. (1966) GeoL Soc. Am. Bull. 77, 741-60.CrossRefGoogle Scholar
Kelley, K.K., and King, E.G. (1961) U.S. Bureau of Mines, Bulleti. 592, U.S. Dept. of the Interior.Google Scholar
Kelley, K.K., and King, E.G. Southard, J.C., and Anderson, C.T.” (1941) U.S. Bureau of Mines, Tech. Paper 625.Google Scholar
McConneU, J.D.C. (1965) Mineral. Ma9. 34, 327-45.Google Scholar
MacDonald, G.J.F. (1953) Am. J. Sei. 251, 884-98.Google Scholar
Murrell, S.A.F. (1985) In Metamorphic Reactions-— Kinetics, Textures and Deformation (A. B. Thompson and D. C. Rubie, eds.) Springer-Verlag, N.Y, 211-41.Google Scholar
Murrell, S.A.F. and Ismail, I.A.H. (1976) Tectonophysics, 31, 20758.CrossRefGoogle Scholar
Posjnak, E. (1938) Am. J. Sci., 5th Set., 35A, 247-72.Google Scholar