Hostname: page-component-cd9895bd7-mkpzs Total loading time: 0 Render date: 2024-12-24T16:44:38.491Z Has data issue: false hasContentIssue false
  • English
  • Français

Evolution of the granulites and sub-division of the granulite facies in Ceylon

Published online by Cambridge University Press:  01 May 2009

D. J. A. C. Hapuarachchi
D. J. A. C. Hapuarachchi
Affiliation:
Geological Survey Department, Colombo 2, Ceylon
Get access Rights & Permissions [Opens in a new window]

Summary

Three subfacies of the granulite facies are recognized: garnet–diopside–quartz subfacies; pyroxene–granulite subfacies; and hornblende–granulite subfacies The erection of a garnet–diopside–quartz subfacies follows De Waard's suggestion (1965) of a garnet–clinopyroxene subfacies. Two major divisions of the hornblende–granulite subfacies are now recognized, (i) garnet–biotite division, (ii) cordierite division. Three sub-divisions of the former are suggested on the basis of critical basic assemblages. Since wollastonite has been found to have a limited areal occurrence within the latter, a two-fold sub-division of the cordierite division is suggested on the basis of the assemblages, (a) calcite–quartz, (b) wollastonite. A seven-fold sub-division of the granulite facies is thus proposed for Ceylon rocks. An attempt is made to trace briefly the major events in the metamorphic history of the rocks supported by available geochronological evidence.

Type
Articles
Information
Geological Magazine , Volume 109 , Issue 5 , September 1972 , pp. 435 - 443
Copyright
Copyright © Cambridge University Press 1972

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

Cooray, P. G. 1962. Charnockites and their associated gneisses in the Pre-Cambrian of Ceylon. Q. Jl geol. Soc. Lond. 118, 239–73.CrossRefGoogle Scholar
Crawford, A. R. 1968. Geochronology of the Precambrian rocks of Peninsular India and Ceylon, Ph.D. thesis, Australian National University, Canberra.Google Scholar
Crawford, A. R. 1969. India, Ceylon Pakistan: New age data comparisons with Australia. Nature, Lond. 223, No. 5204, 380.CrossRefGoogle Scholar
De Waard, D. 1965. The occurrence of garnet in the granulite-facies terrain of Adirondack Highlands. J. Petrology 6, 165–91.CrossRefGoogle Scholar
Fyfe, 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. 1967. Hornblende–granulite subfacies mineral assemblages from areas in Ceylon. Geol. Mag. 104, 29–34.CrossRefGoogle Scholar
Hapuarachchi, D. J. A. C. 1968. Cordierite and wollastonite-bearing rocks of south-western Ceylon. Geol. Mag. 105, 317–24.Google Scholar
Hietanen, A. 1967. On the facies series in various types of metamorphism. J. Geol. 75, 187–214.CrossRefGoogle Scholar
Turner, F. J. & Verhoogen, J. 1960. Igneous and Metamorphic Petrology. McGraw-Hill, New York.Google Scholar