英语语法分析

What is surprising is that the deep saprolite contains a lot of quartz.

令人惊讶的是，1米深的腐岩里就含有大量的石英。

The leaching of seepage water takes place in the evolution stages of the saprolite.

渗入水的溶滤作用主要发生在腐岩的演化阶段。

After that, the weathering front spread gradually and the rock block is turned into a saprolite block.

随着时间加长，风化前锋逐渐扩展，岩石结构体最终转化为腐岩结构体。