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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  and
F. H. Hubbard
D. R. Iball
Affiliation:
Department of Geology, The University, Dundee
F. H. Hubbard
Affiliation:
Department of Geology, The University, Dundee
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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
Information
Mineralogical Magazine , Volume 46 , Issue 339 , June 1982 , pp. 247 - 251
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1982

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