Chaîne varisque
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Fig. 14


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Geochemical characteristics of magmatic rocks exposed in the East French Massif Central. Summary of the geochemical characteristics of E-FMC granitoids, in a A/CNK (molar Al2O3/CaO + Na2O + K2O diagram, Shand 1943) vs. FSMB ((FeOt + MgO) × (Sr(wt.%) + Ba(wt.%)) diagram (Laurent et al., 2014). This diagram separates granitoids related to different sources (Moyen et al., 2017), and shows that KCG are primarily related to the differentiation of vaugnerites (with minor crustal components occasionaly); MPG are related to a metasedimentary source; CPG are generated from a source dominated by orthogneisses, but with more common involvement of either a metasedimentary component (particularly pronounced in the Velay complex) or a mafic component (e.g. the Margeride granite).

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