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A Note on Cleavages in Crenulated Rocks

Published online by Cambridge University Press:  01 May 2009

M. J. Rickard
M. J. Rickard
Affiliation:
Geological Survey, Suva, Fiji.
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Abstract

Published descriptions and new field observations in Ireland and Canada confirm that strain-slip cleavage should not be classified with fracture cleavage. The term crenulation cleavage is proposed to replace the generic one of strain-slip cleavage. Crenulation cleavage differs essentially from slaty and fracture cleavage in that it only develops in laminated rocks and is consequently nearly always a secondary structure. Intense metamorphism converts crenulation cleavage into a new schistosity or cleavage with characteristics similar to slaty cleavage. Two fundamentally different types are recognized and it is suggested that crenulation cleavage is a valuable indicator of metamorphic conditions during the various phases of deformation.

Type
Articles
Information
Geological Magazine , Volume 98 , Issue 4 , August 1961 , pp. 324 - 332
Copyright
Copyright © Cambridge University Press 1961

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References

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