The Archaean and Katarchaean units are preserved mainly as relic masses.太古界与远太古界主要作为残余体保存下来.This type of graphite deposits were formend in the Late Archaean to Early Proterozoic.该类矿床的成矿时代多集中在晚太古代末至早元古代初期,并且具有全球性.Archaean...

Archaean的音标：Archaean的英式发音音标为：[ɑ:'ki(:)ən]Archaean的美式发音音标为：[ɑr'kiən]...

adj.太古代的...