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Geochemical Journal
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Chemical inhomogeneity of amphiboles in relation to section orientation in routine EPMA analyses

Rodney H. Grapes
Geochemical Journal, Vol. 11, No. 4, P. 253-255, 1977

ABSTRACT

Routine EPMA analyses of homogeneous amphiboles in amphibolites indicate significant compositional variation between sections with two cleavages and those with a single cleavage parallel to the c axis. Sections with two cleavages are enriched in SiO2, MgO, MnO and CaO relative to sections with a single cleavage which are enriched in Al2O3, FeO(total), TiO2, Na2O, and K2O (i.e. ∑ of tschermakiteedenite substitutions). The degree of compositional variation between the different amphibole sections may, in part, be related to the extent of equilibrium attained in the rocks during recrystallization.

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