Geochronological and geochemical constraints on the formation of Chizhou Cu-Mo polymetallic deposits, middle and lower Yangtze metallogenic belt, eastern China

•Ages of Cu-Mo polymetallic deposits and the granodiorites (porphyries) in the Chizhou region are simultaneous;•The granodiorite (porphyry) are a high-K calc-alkaline I-type granodiorite;•The granodiorites formed from a mixed magma;•The formation of Cu-Mo polymetallic deposits depends on slab-derived Cl-enriched fluids, an oxidizing mixed source.