Ningwu Basin is one of the important ore districts in the Middle-Lower Reaches of the Yangtze River Belt, China, and also a base for constructing the metallogenic model of porphyry-type iron deposits. Aoshan iron deposit is one of the reprehentive porphyry-type iron deposits in Ningwu Basin. Two types of magmatic rocks closely related to mineralization were selected as the study objects. Detailed zircon U-Pb age dating for magmatic rock samples yields an age of (131.7±0.7) Ma for gabbrodiorite porphyrite and (126.1±0.5) Ma for granodiorite porphyry cutting across the main orebodies using LA-MC-ICP-MS. According to the relationship between petrogenesis and mineralization, the age of mineralization of Washan iron deposit is 131.7 ~ 126.1 Ma, suggesting that it belongs to the Early Cretaceous. The mineralization associated with early magmatism in Ningwu basin occurred in an extensional tectonic regime, possibly induced by lithospheric thinning.