Middle Carboniferous magmatism. Magmatic rocks with ages ranging from c. 345 to c. 310 Ma are widespread throughout the northern part of the French Massif Central indicating the presence of a partially molten source at depth during this period. Plutonic rocks display a variety of geochemical signatures encompassing MPG-type, CPG-type, and KCG-type pointing to the contribution of crustal and mantle sources.