Hostname: page-component-745bb68f8f-cphqk Total loading time: 0 Render date: 2025-01-23T17:24:14.764Z Has data issue: false hasContentIssue false
  • English
  • Français

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.
Get access Rights & Permissions [Opens in a new window]

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

Agron, S. L., 1950. Structure and petrology of the Peach Bottom Slates, Pennsylvania and Maryland and its environment. Bull. geol. Soc. Amer., lxi, 1265–1306.CrossRefGoogle Scholar
Brace, W. E., 1953. The Geology of the Rutland Area, Vermont. Bull. Vt. Developm. Comm. 6.Google Scholar
Bonney, T. G., 1886. Anniversary address of the President. Quart. J. geol. Soc. Lond., xlii, p. 95.Google Scholar
Harker, A., 1950. Metamorphism, Methuen, London.Google Scholar
Heim, M. M., 1883. Mechanismus der Gebirgsbildung, Atlas Taf., xv.Google Scholar
Hoeppner, R., 1956. Zum Problem der Bruchbildung, Schieferung und Faltung. Geol. Rdsch., xlv, 247–283.CrossRefGoogle Scholar
King, B. C., 1956. Structural Geology, Part III. Sci. Progr., xliv, 88–104.Google Scholar
Knill, J. L., 1960. The tectonic pattern in the Dalradian of the Craignish-Kilmelfort district, Argyllshire. Quart. J. geol. Soc. Lond., cxv, 339–364.Google Scholar
Knopf, E. B., 1931. Retrogressive metamorphism and phyllonitization. Amer. J. Sci., xxi, 1–27.CrossRefGoogle Scholar
Leith, C. K., 1905. Rock Cleavage. Bull. U.S. geol. Surv., No. 239.Google Scholar
Mead, W. J., 1940. Folding rock flowage and foliate structures. J. Geol., xlviii, 1007–1021.CrossRefGoogle Scholar
Muff, H. B., in Peach, B. N. et al. , 1909. The geology of the seaboard of Mid-Argyll. Mem. geol. Surv. U.K. No. 36.Google Scholar
Pitcher, W. S. and Cheesman, R. L., 1954. Summer field meeting in N.W. Ireland with an introductory note on the geology. Proc. Geol. Ass., Lond., lxv, 345–371.CrossRefGoogle Scholar
Rast, N., 1958. The tectonics of the Schiehallion complex. Quart. J. geol. Soc. Lond., cxiv, 25–46.CrossRefGoogle Scholar
Rickey, J. E., 1948. Pre-metamorphism cleavage in the Moine Schists of Morar, Western Inverness-shire. Trans. Edinb. geol. Soc., xiv, 402–419.Google Scholar
Turner, F. J., 1936. Interpretation of schistosity in the rocks of Otago, New Zealand. Trans, roy. Soc. N.Z., lxvi, 201–224.Google Scholar
White, W. S., 1949. Cleavage in East-Central Vermont. Trans. Amer. geophys. Un., xxx, 587–594.Google Scholar
Wilson, G., 1946. The relation of slaty cleavage and kindred structures to tectonics. Proc. Geol. Ass., Lond., lvii, 263–302.CrossRefGoogle Scholar