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Journal of the Geological Society; 1976; v. 132; issue.2; p. 155-178;
DOI: 10.1144/gsjgs.132.2.0155
© 1976 Geological Society of London

The formation of crenulation cleavage

J. W. COSGROVE

Investigation of a theory of buckling of an anisotropic material has enabled the micro-folding of mineral fabrics to be more clearly understood. It is shown that "Crenulations" (microfolds) are associated with a variety of buckling instabilities which develop in stressed mineral fabrics or finely laminated multi-layers. Crenulation cleavage planes are generally formed as a consequence of mineral migration which occurs in response to stress gradients intimately associated with the developing microfolds.




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