钦-杭结合带是位于华夏古板块与扬子古板块的构造结合带。本研究分析了结合带南段云开地块的变质基底及中生代改造作用。在具有代表性的庞西垌穹状复式岩体中,由内而外依次为花岗岩和片麻状花岗岩、花岗片麻岩、云开群以及沉积岩。研究区内可见两类侵入接触关系,分别为花岗片麻岩、片麻状花岗岩与云开群呈侵入接触关系,花岗岩与花岗岩片麻岩呈侵入接触关系。利用锆石LA-ICP-MS U-Pb方法和白云母40Ar-39Ar方法测年显示,花岗片麻岩和片麻状花岗岩的 Qin - Hangzhou belt is located in the Huaxia old plate and the Yangtze ancient plate tectonic band. This study analyzed the metamorphic basement and Mesozoic remodeling of the Yunkai block in the southern segment of the bond belt. In the representative Pangxiu dome complex, granite and gneissic granite, granite gneiss, Yunkai group and sedimentary rock are in turn outwards and inward. There are two types of invaded-contact relationship in the study area, which are respectively granitic gneiss, gneissic granite and Yunkai group intrusion and granite and granite gneiss in invaded contact. Using zircon LA-ICP-MS U-Pb method and muscovite 40Ar-39Ar dating, it is shown that granitic gneiss and gneissic granite