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Geochemical Journal
Geochemical Journal An open access journal for geochemistry
Published for geochemistry community from Geochemical Society of Japan.

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


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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