Fig. 7


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(a) Biplot PC1 vs. PC2 diagram displaying results of principal components analysis (PCA) performed on major and trace element compositions of the different generations of micas composing the two-mica granite, the greisenized facies, the greisen and the mineralized vein selvages of Panasqueira. (b) Diagram illustrating ideal dioctahedral substitutions for different populations of micas (after Guidotti, 1984). (c) to (g) Binary diagrams displaying the major and trace element content for the different generations of white-mica considered in this study. The elements pairs displayed in these diagrams were defined from PCA performed on the white-mica composition dataset.

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