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Lattice structural variation in K-feldspar megacrysts of associated charnockite and alkali granite

Published online by Cambridge University Press:  05 July 2018

D. R. Iball
Affiliation:
Department of Geology, The University, Dundee
F. H. Hubbard
Affiliation:
Department of Geology, The University, Dundee

Abstract

The perthite megacrysts from charnockitic and non-charnockitic members of a sialic intrusive complex in the Varberg area of south-west Sweden have been investigated by powder X-ray diffraction. The extent of Al/Si order in the K-feldspar host lattices of the megacrysts is restricted in all but the major alkali granite differentiate. A direct relationship between the hydration state of the containing rock and the degree of order of the megacryst lattices is indicated. High lattice strain is common to all the megacrysts but decreases progressively with increasing triclinicity.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1982

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References

Appleman, D. E., Evans, H. T. Jr., and Handwerker, D. S. (1972 U.S. Geol. Survey, Computer Contribution No. 20, Job 9214.Google Scholar
Borg, I. Y., and Smith, D. K. (1969 Geol Soc. Am. Mere. 122.Google Scholar
Constable, J. L., and Hubbard, F. H. (1981 Mineral. Mao. 44, 409-15.CrossRefGoogle Scholar
Hubbard, F. H. (1975 Geol. Fören. Stockholm Förh. 97, 223-36.CrossRefGoogle Scholar
Hubbard, F. H. (1978 Ibid. 100, 31-8.Google Scholar
Hubbard, F. H. and Constable, J. L. (1980 Ibid. 102, 40-2.Google Scholar
Hubbard, F. H. and Whitley, J. E. (1978 Nature 271, 439-40.CrossRefGoogle Scholar
Hubbard, F. H. (1979 Lithos 12, 1-11CrossRefGoogle Scholar
Mackenzie, W. S., and Smith, J. V. (1961 Cursillos Conf. Inst. Lucas Mallada. 8, 53-69Google Scholar
Smith, J. V. (1974 Feldspar Minerals Vol. 1, Springcr-Verlag.Google Scholar
Stewart, D. B., and Ribbe, P. H. (1969 Am. J. Sci. 267A, 444-62.Google Scholar
Stewart, D. B., and Ribbe, P. H. and Wright, T. L. (1974 Bull. Soc. ft. Mineral. Cristallogr. 97, 356-77.Google Scholar
Wright, T. L. (1968 Am. Mineral. 53, 88-104Google Scholar
Wright, T. L. and Stewart, D. B. (1968 Ibid. 53, 3887.Google Scholar