the National Natural Science Foundation of China(Grant No.49772148); the Open Lab of the Geo-dynamics(Grant No.dlkf-9802) under the administration of the Ministry of Geology and Mineral Resources of China.
A dating of two biotite samples taken from the meso- and low-temperature myloniteswithin the Shangyi-Chicheng fault belt on the north of the North China Craton yields 40Ar/39Ar iso-topic ages of (399 1) Ma and (263 2)...