Flattened-elongated-type mica-schist, gneiss, orthogneiss and basic granulite blocks of Proterozoic basement are involved in this zone, which are strongly mylonitized.

• 元古代基底岩石中的云母片岩、片麻岩、花岗片麻岩、基性麻粒岩被压扁拉长且强烈糜棱岩化 。