Almandine Pseudomorphous after Plagioclase in a Metadolerite Dyke from the Jotunheim, Norway

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

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.

Mineralogical Magazine; March 1979 v. 43; no. 325; p. 127-130; DOI: 10.1180/minmag.1979.043.325.11
© 1979, The Mineralogical Society
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