Chaîne varisque
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Fig. 6


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Petrology of granitoids of the French Massif Central. Plutons are distinguished on the basis of the petrology of their dominant facies according to the classification of Barbarin (1999). ACG-type (calc-alkaline granites) are interpreted as arc magmas originated in an Andean-type continental margin by partial melting of an enriched mantle contaminated by the crust of the upper plate and/or mixed with crutal magmas. MPG-type (or muscovite-bearing peraluminous granites) are attributed to muscovite dehydration- or water present melting of a dominantly metasedimentary source. CPG-type (or cordierite-bearing peraluminous granites) are attributed to biotite dehydration melting of orthogneisses. KCG-type (or K-rich calc-alkaline granites) typically contain abundant micromafic enclaves and are attributed to mixing between magmas generated by partial melting of the crust and a magma generated by partial melting of an enriched lithospheric mantle represented by Mg-K diorites (the so-called vaugnerites).

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