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Almandine pseudomorphous after plagioclase in a metadolerite dyke from the Jotunheim, Norway

Published online by Cambridge University Press:  05 July 2018

M. H. Battey ,
W. Davison  and
P. J. Oakley
M. H. Battey
Affiliation:
University of Newcastle upon Tyne NE1 7RU, England
W. Davison
Affiliation:
University of Newcastle upon Tyne NE1 7RU, England
P. J. Oakley
Affiliation:
University of Newcastle upon Tyne NE1 7RU, England
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Summary

An undeformed metadolerite dyke cutting foliated pyroxene-granulite facies gneisses in the Jotunhelm, Norway, has almandine rods replacing the cores of plagioclase laths, although garnet is generally absent from the enclosing gneisses, and is not present in reaction zones between peridotites and gneisses. Chemical analyses of the dyke and its garnet, plagioclase, and clinopyroxene are given. The presence of garnet in the dyke is attributed to the low mg ratio of the rock. The nature of the reaction leading to garnet pseudomorphous after plagioclase is discussed.

Type
Research Article
Information
Mineralogical Magazine , Volume 43 , Issue 325 , March 1979 , pp. 127 - 130
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1979

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