摘要
The Xidatan rock series consist of mylonite, gneiss and granite. The U-Pb age shows that the granite was formed at 206 Ma, and the 40Ar/39Ar ages of the biotite display that the mylonite was formed at 145 Ma when the Xidatan ductile shear zone occurred. At about 110-100 Ma, the Xidatan Fault reactivated again. As a result, the biotite and muscovite of Xidatan rock series opened their argon isotope system.
The Xidatan rock series consist of mylonite, gneiss and granite. The U-Pb age shows that the granite was formed at 206 Ma, and the ^(40)Ar/^(39)Ar ages of the biotite display that the my- lonite was formed at 145 Ma when the Xidatan ductile shear zone occurred. At about 110-100 Ma the Xidatan Fault reactivated again. As a result, the biotite and muscovite of Xidatan rock series opened their argon isotope system.
基金
supported by the National Natural Science Foundation of China(Grant No.49973003)
the National Key Basic Research Development Project of China(Grant No.2001CB409807)
the Geological Science Special Project of the Ministry of Land and Resources(Grant No.2001010205).
