Fault Dating by the Surface Textures of the Quartz Grains in Fault Gouge

The surface textures of the quartz grains at the same position of a fault are different,furthermore,even the same quartz grain,its every facies may be different each other.So we introduce statistical parameter estimation method into the data process,and regard all facieses of the quartz grains as a whole in the dating of fault F1 south of the dam area of the Jinchuan hydropower station.The result indicates that the last strong movement of fault F1 probably occurred in Early Pleistocene,which agrees with the result obtained by the Electronic Spin Resonance method.