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Cordierite and wollastonite-bearing rocks of south-western Ceylon

Published online by Cambridge University Press:  01 May 2009

D. J. A. C. Hapuarachchi
D. J. A. C. Hapuarachchi
Affiliation:
Geological Survey Department, 48, Sri Jinaratana Road, Colombo, 2, Ceylon.
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Summary

In the region east of the south-western belt of Ceylon, garnet is stable in biotite-bearing pelitic rocks which belong to the hornblende-granulite subfacies. In the south-western belt, which includes Zone B of the eastern part of the Gampaha sheet, garnet is unstable in biotite-bearing pelitic rocks, garnet reacting with biotite to produce cordierite which has a widespread occurrence in the belt to which it is confined. To accommodate the stable cordierite-bearing pelitic assemblages the erection of a cordierite-granulite subfacies is necessary. Wollastonite-bearing rocks, which commonly occur in the belt and are confined to it, belong to the cordierite-granulite subfacies.

Type
Articles
Information
Geological Magazine , Volume 105 , Issue 4 , August 1968 , pp. 317 - 324
Copyright
Copyright © Cambridge University Press 1968

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References

REFERENCES

Fye, W. S., Turner, F. J. & Verhoogen, J. 1958. Metamorphic reactions and metamorphic facies. Mem. geol. Soc. Am., 73.Google Scholar
Hapuarachchi, D. J. A. C. 1965. The geology of the eastern part of the Gampaha sheet. (Abs.) Proc. Ceylon Ass. Advmt Sci., 1, 44.Google Scholar
Hapuarachchi, D. J. A. C. 1967. Hornblende-granulite subfacies mineral assemblages from areas in Ceylon. Geol. Mag., 104, 29–34.CrossRefGoogle Scholar
Turner, F. J. & Verhoogen, J. 1960. Igneous and Metamorphic petrology. 2nd Ed. New York.Google Scholar