在造山的过程中，一些非常古老的沉积物已被转化为火成岩和变质岩，已经无法辨认了。

Some very ancient sediments were no longer recognizable, having been converted to igneous and metamorphic rocks in the course of mountain building.

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石英是桂东地区各类金矿床中普遍出现的脉石矿物，同时也是重要的造岩矿物和金的载体。

Quartz is gangue mineral widespread in all types of gold deposits in Guidong Area and is an important rock-forming mineral and gold-carrier mineral as well.

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主要造岩矿物的含量是火山岩分类定名的主要依据。

Assorting and naming of volcanic rock is mainly based on the content of main petrogenetic mineral.

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