Modelling Diverse Processes in the Petrogenesis of a Composite Batholith: the Central Bohemian Pluton, Central European Hercynides

The multiple intrusions making up the Central Bohemian Pluton in the Central European Hercynides have petrographic and geochemical features consistent with the presence of four main granitoid suites. Major-element, trace-element and Sr-Nd isotopic compositions are used to model their petrogenesis. Partial melting of metabasic rocks or of a CHUR-like mantle source are interpreted to have produced melts parental to the most primitive calc-alkaline Sazava suite. Interaction of basic with more acidic magmas followed by extensive amphibole-plagioclase-dominated fractionation accounts for the production of trondhjemites. Alternatively, the trondhjemites correspond to small-degree melts of a metabasic source. AFC (assimilation-fractional crystallization) modelling with a paragneiss as a contaminant and increasing D