华夏地块前加里东期变质基底的年代构造格架

华夏地块的前加里东期变质基底大致可划分为三大构造展，主体为古元古代中条旋回的结晶基底和新元古代-早古生代的褶皱基底，局部存在裂谷环境下的中元古代变质岩石。大量的单颗粒钻石年龄和Sin－Nd同位素测年资料显示出华夏地块的古元古代岩石形成于2400～2000Ma，中元古代的岩石形成于1400～1000Ma，而新元古代-早古生代的地层大致形成于740～430Ma。中条运动是华夏地块一次重要的造壳运动，奠基了华夏地块结晶基底，晋宁运动使华夏地块的闽浙隆起区彻底固结，而加里东运动则使得整个华夏地块彻底固结。

THE CHRONOTECTONIC FRAMEWORK OF PRECALEDONIAN BASEMENTS FROM CATHAYSIA BLOCK

The Cathaysia Bfork include two tectonic Units: Min-Zhe Uplift and HuananCaledOnian bo Basin. The mearnorphic basements from Cahaysia Bha can be divided into threetectono-strtigraphy layers including, Paforroterozoic rocks of Zhongtiao Cycle, Mesoproterosoicrocks of Jinning Cycle and the Neoproterozoic to Early Paleozoic rocks of Caledonian Cycle. A forof single zircon U-Pb dating and whole rock isochron of Sm-Nd dating suggested that thePalooproterosoic rock in Chthaysia Bfork is formed in the time span from 2 400 Ma to 2000 Ma,Mesoproterocoic frOIn 1 400 Ma to 1000 Ma and the latest formdfrom 740 Ma to 430 Ma. TheZhongiao Movernnt is very important tectonic event in Chthaysia Block, which caused the initialcratonization of the Block. Jinningian Movement make the final solidification of the MinZheUplift, whereas the Caledonian Movemnt solidify the Caledonian sea basin finally.