1 Introduction The Tongling area is one of the largest copper and gold mineralization areas related to granitoids in China, and the accurate ages of intrusions are the basis for exploring the dynamics of magmatism and mineralization. Previous researchers have conducted extensive geochronology investigations about intrusions and mineralization, including the K-Ar, 40Ar-39Ar, Rb-Sr and U-Pb methods, but there are large differences between the ages yielded. K-Ar ages range from 87 Ma to 186…