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On an anatectic granite from Bygland, south Norway

Published online by Cambridge University Press:  05 July 2018

R. Sen  and
Ananda Deb Mukherjee
R. Sen
Affiliation:
Department of Geology, Presidency College, Calcutta
Ananda Deb Mukherjee
Affiliation:
Department of Geological Sciences, Jadavpur University, Calcutta-32
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Summary

The Pre-Cambrian granitic rocks of Bygland are structurally and texturally concordant with the metamorphosed country rocks. Both these rock types plot close together in Q-Or-Ab and Ab-An-Or normative diagrams; trace element distribution is also similar. The granite has been reconstituted from the country rocks under epidote-amphibolite facies conditions. Plagioclase feldspars show that the granite is not a ‘mature’ rock; they are, however, ‘mature’ in the country rocks and are products of typical regional metamorphism (Ohta et al, 1968). Plagioclases in the granite are relicts of country rocks showing traces of a premetamorphic crystalline state. They have been rejuvenated with the introduction of alkali material during the reconstitution.

Type
Research Article
Information
Mineralogical Magazine , Volume 39 , Issue 302 , June 1973 , pp. 216 - 223
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1973

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