它主要由云母岩组成，但也有少量的石英岩。
It consisted mainly of micaschists, but also minor quartzites.
长石石英云母片岩与副片麻岩一起构成了古老的表壳结构。
The quartz-mica schist together with paragneiss constituted the old supracrustal series.
在绢云母石英片岩中开挖隧洞，使用多臂钻造孔爆破，出现钻孔有规律的弯曲现象，影响了钻爆速度和成洞质量。
When we dig a tunnel in sericite quartz-schist with dobby drills, regular bending of the boreholes appears, which affects drilling speed and the borehole quality.
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