Zircon U-Pb and muscovite 40Ar/39Ar dating of Pb-Zn-(Cu) polymetallic deposits in northeastern Hunan Province, Jiangnan Orogen: Evidence for large-scale mineralization in South China at ca. 150–120 Ma

•The ca. 150–120 Ma was also an important mineralization period in South China.•The low oxygen fugacity may be responsible for little or no Cu resources in the Dayunshan-Mufushan region.•The ca. 150–120 Ma mineralization was likely caused by Middle Jurassic to Early Cretaceous extension.