晚前寒武纪,在我国指约19亿至6亿年前,长达十多亿年的一段时间。它是地质历史上的一个重要转变阶段。在此期间,地球的气圈、水圈发生了显著的变化;生物界出现了真核生物;沉积作用、构造运动和成矿作用也都表现出与太古宙全然不同的巨大差别。例如,自晚前寒武纪起,在地球上不再产生绿岩带(除个别地区可能的“绿岩带” Early Precambrian, in our country refers to about 1.9 billion to 600 million years ago, a period of more than one billion years. It is an important phase of geological history. During this period, the Earth’s balloon and hydrosphere have undergone significant changes; eukaryotes have emerged in the biosphere; and sedimentation, tectonic movement and metallogenesis have all shown great differences from the Archean. For example, since the late Precambrian, greenstone belts were no longer produced on Earth (except for possible “greenstone belts” in some areas)