前寒武系 meaning in English

azoic
precambrian system
precambriansystem

Geochemical characteristics of precambrian metamorphic rocks in north wuyi region
北武夷地区前寒武系变质岩地球化学特征
It is believed that the distribution of gold deposits in fujian is controlled by regional deep - seated structure and precambrian volcanic flysch formation containing charcoal is main gold source rock . the accumulation of gold is closely related with yanshan granitic magma intrusion
金矿空间分布受一定的区域深部构造单元所制约，前寒武系富含炭质的火山复理石建造是福建省金矿的主要矿源岩，金的富集成矿与燕山期花岗岩类岩浆侵入作用密切相关。