NEW INFORMATION ON THE AGES OF THE WUDANG GROUP-WITH A DISCUSSION

More than 40 isotopic age data of the Wudang Group are available now but their interpertations are somewhat confusing.The authors analyzed and interpreted again all the age data in the Group using some new dating methods. The integrated analysis indicates the ’following:（1）the lower limit of the ages of the meta-acid volcanic rocks should be older than 1900 Ma;（2）the single-zircon age of the Yunxi Group is 1527 Ma,which suggests that the Yunxi Group should belong to the upper part of the Wudang Group;（3）the age of meta-basic volcanic rocks should be younger than 1700 Ma 1（4）the age of the base of metasedimentary rocks is less than 1250 Ma; （5）the age range of meta-volcanic rocks is 1900-1200 Ma and the age range of metasedimentary rocks is about 1200-800 Ma.