新太古代，时间：从距今约28亿年——25亿年前。在对生物产生大的变化方面，就是出现了第一次对生物有大的方面影响的“冰期。新太古代是太古宙的最后一个代（第四个时期），前一个是中太古代，后一个是元古宙的的第一个代“古元古代”。
容矿岩系为新太古代变质石英闪长岩、斜长花岗岩。
All orebodies are gold quartz vein type and hosted in New Archaean metamorphic quartz diorite and plagiogranite.
北大河岩群的蚀源区存在中-新太古代的古老陆壳。
The data also imply that there are Meso- to Neoarchaean continental crusts in the source areas.
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。
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.
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