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Rotational fabrics in metamorphic minerals

Published online by Cambridge University Press:  05 July 2018

Derek Powell  and
J. E. Treagus
Derek Powell
Affiliation:
Department of Geology, Bedford College, London, N.W. 1
J. E. Treagus
Affiliation:
Department of Geology, The University, Manchester 13
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Summary

A model has been constructed that establishes the geometry of inclusion fabrics to be expected in near-spherical crystals that grow continuously while either the crystals rotate in a static matrix or a matrix fabric rotates about them. Garnets in certain metamorphic rocks contain inclusion fabrics whose geometry is very similar to that of the model. Such syntectonic, snowball, or rotational garnets, as they have previously been termed, can be studied in three dimensions. A method is outlined whereby the rotation axes for individual crystals viewed in thick sections can be located in certain planes of cut. The significance of the geometry of included rotational fabrics is discussed in relation to previous work and to possible mechanisms of rotation.

Type
Research Article
Information
Mineralogical Magazine , Volume 37 , Issue 291 , September 1970 , pp. 801 - 814
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1970

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