Intrusive rocks show a granodiorite trend, locally with a slight shift towards monzonite.
Petrography and geochemistry indicate mantle source magmas with variable crustal contamination and differentiation in shallow magma chambers. Late stage rhyolites indicate crustal melting and magma mixing. Granodiorite, diorite and various porphyritic rocks were emplaced at deeper levels and in the basement. Rhyodacite domes and related pumice tuffs of Early Sarmatian age occasionally occur.