Fayalite-bearing quartz syenite could represent the early fractional stage initial granitic magma derived from archean protolith in a deeper and reductive environment.
含铁橄榄石石英正长岩，代表了岩浆分离结晶初期还原条件下，太古代母岩派生的初始岩浆组成。
The protolith of marble is limestone.
大理岩的原岩为灰岩。
The age of the protolith of the Hong′an Group in Hubei has been a controversial issue.
湖北红安群的原岩形成时代一直是个有争议的问题。
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