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Of, belonging to, or designating the earlier of two divisions of the Precambrian era.
早期前寒武纪前寒武纪的两期中较早的一期的，属于它的或以其命名的
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An attempt has been made in present paper to advance the early periodic evolution of the earth crust in this region in four stages, by studing and analyzing the features of regional geophysical fields; the constitutional feature, division and correlation of early Pre-Cambrian strata of this region; the facies, formation and palaeogeographical environment; the development and evolution of palaeotectonic deformation and its control of the metamorphic iron ore.
本文从区域地球物理场特征、本区前寒武纪早期地层的组成特点和划分对比、岩相建造古地理环境、古构造变形及其对变质铁矿的控制作用，提出本区地壳早期演化分为四个阶段：1。
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Several main results on the evolutions of the life and environment on early earth are summarized as follows:(1) the oxygenation of surface environment didn''t cease until a stable stage for 0.4Ga appeared after 1.6Ga;(2) compared to the isotopic compositions of kerogens and coexisted carbonates, the differences between two can effectively carrier the signals from local environments and bio-assemblages;(3) multiple isotopic relationships between kerogens and individual alkanes in Proterozoic samples were observed, which would depend on the specific biogeochemical processes;(4) repeated biogeochemical changes were observed accompanying Neoproerozoic glaciations, which suggesting that environmental rather than evolutionary forces were driving the biogeochemical changes;(5) the bio-radiations after Neoproterozoic glaciations were definitely suggested by molecular and isotopic data to be at the early Cambrian and after the middle of Doushantuo deposition with different triggers for them.
研究获得以下重要认识：（1）古元古代地表环境的氧化可能一直持续到中元古代早期(约1.6Ga)，而在此之后的4亿年里则保持相对稳定；（2）相对于传统的干酪根和碳酸盐的碳同位素组成，二者之差则能更好反映区域环境的演化特征；（3）在元古代干酪根与单体烷烃类之间存在多种碳同位素组成关系；而其与不同的生物地球化学过程有关；（4）全球海洋生物地球化学特征随新元古代多次冰期出现循环波动，这显然为环境因子的驱动；（5）在新元古代大冰期之后，分子与同位素数据显示地球生命在陡山沱中后期和早前寒武纪出现两次大辐射，然而两次生命辐射的本质却是不同的。
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The study of organic origin and its early evolution must be based on fossils in Precambrian strata.
而生命起源及其早期演化则必须依赖前寒武纪地层中的生命化石记录进行研究。
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SIB：西伯利亚
网站描述: 在前寒武纪最晚期和古生代早期,超级大陆Rodinia位于南极附近,其后,发生开裂,各个块体纷纷向北飘移. 这些陆快中最显著的包括北美洲陆快(Laurentia),Baltica和西伯利亚(SIB)陆块.