archaean n era 太古代
Archaean era granulite facies metamorphite series are extensively outcropped in Sa - heqiao, Hebei province.
冀东迁西洒河桥是太古代麻粒岩相变质岩系广泛出露的地区。
The wall rocks of gold deposits located in Zhaoyuan gold mineralization area were rooted in metamorphic rocks in Jiaodong rock group in Archaean era and granites in Mesozoic era.
山东招远金矿集中区金矿床的围岩为新太古代胶东岩群变质岩和中生代花岗岩。
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