Fig. 6


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Geochemical characteristics of white-mica composing the two-mica granite, greisenized facies, the massive greisen and the mineralized veins selvages of Panasqueira. (a) Ternary Ti–Na–Mg diagram displaying the fields of primary and secondary muscovite (after Miller et al., 1981). (b) Compositions of white-mica plotted in the mineralochemical phase diagrams (Al–(Fe + Mg + Mn)–Si) of Monier and Robert (1986). (c) Chemical maps of Al, Ti, Fe and Mg of white-mica composing the greisen of Panasqueira. These white-micas exhibit a strong chemical zoning corresponding to hydrothermal overgrowths of primary magmatic muscovites.

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