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Granulite facies metamorphosed basic dykes of the Torngat Mountains, Labrador

Published online by Cambridge University Press:  05 July 2018

William C. Morgan  and
Frederick C. Taylor
William C. Morgan
Affiliation:
Geological Survey of Canada, Ottawa, Ontario, Canada
Frederick C. Taylor
Affiliation:
Geological Survey of Canada, Ottawa, Ontario, Canada
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Summary

In the Four Peaks region of Labrador Precambrian hornblende granulite facies metamorphosed basic dykes discordantly cross the foliation of garnet-hornblende-pyroxene granulites with sillimanite-garnet-biotite-quartz-feldspar gneiss. Most of the dykes are schistose or banded, but some are massive and undeformed with blastophitic textures. Mineral analyses are given for the equilibrium assemblage in one analysed clinopyroxene-orthopyroxene-amphibole-garnet-plagioclase- quartz blastophitic dyke. Dyke intrusion occurred after formation of the host rock foliation, while the metamorphism was about 1400 Myr ago.

Type
Research Article
Information
Mineralogical Magazine , Volume 38 , Issue 298 , June 1972 , pp. 666 - 669
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1972

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