1 IntroductionSoutheast China lies at the plate junction between thePacific and the Eurasian plates, where granitoids andvolcanic rocks are widely exposed and large-scalemineralization was developed in the Late Mesozoic.Therefore, many geologists have paid much attention to thegeodynamics in this region (Jahn et al., 1990; Lampierre etal., 1997; Zhou and Li, 2000; Li, 2000; Chen et al., 2002; Liet al., 2003). Many achievements in scientific research onthe Late Mesozoic granitoids and vol…