1.【地】前寒武纪的
1.前寒武纪
1.the period of geological time, 4,650 to 700 million years ago, during which the Earth's crust consolidated and primitive life first appeared
1."Plumes" from deep mantle do not operate in the modern Earth and did not operate in Precambrian time.
来自地幔深处的“热柱”，在现代地球上并无发生，其实，自寒武纪之后就不再发生。
2.Chemical fossils (e. g. alkanes and porphyrins) are often the only evidence for life in rocks of PRECAMBRIAN age.
化学化石（烷烃和卟啉）是前寒武纪地层中生命存在的唯一证据。
3.The Precambrian metamorphic rocks in Northern Fujian are the important part consisting of the Cathaysian palaeocontinental basement.
闻北前寒武纪变质岩是华夏古陆基底的重要组成部分。
4.The first three eons, which together lasted nearly 4 billion years, are together known as the Precambrian.
前三个时期合起来持续了40亿年，合称为前寒武纪（隐生宙）。
5.Initial Sr isotope ratios show that the ore materials of the deposit were derived from the host rocks or Precambrian basement.
锶同位素初始比值测试结果表明大梁子铅锌矿床成矿物质来源可能主要源自围岩碳酸盐岩或基底地层。
6.with the geological evolution in precambrian , minerogenetic materials and types of mineral deposits obviously varied and increased.
随著中国前寒武纪地史的演化，成矿物质种类和矿床类型具有明显的变化和增多。
7.There are abundant mineral resources in the Precambrian rock formations, on which the survival and development of mankind depend.
在前寒武纪岩层中蕴藏着丰富的矿藏，为人类的生存和发展提供了大量的有用资源。
8.That history began with the origin of the primitive, unicellular aquatic algae of the Precambrian Eon.
最初，前寒武纪出现原始的单细胞水生藻类，除了蓝绿藻和细菌之外。
9.Metallogenic belt belong to the province of East Kunlun Precambrian, Paleozoic, Mesozoic gold and copper zinc iron ore belt.
其成研究区带隶属昆仑成矿省东昆仑前寒武、晚古生代、中生代金铜铅锌铁成矿带。
10.Precambrian BIF iron ore deposit can be pided into two types, Algoma-type and Lake Superior-type.
前寒武纪条带状含铁建造铁矿床分为阿尔戈马型和苏必利尔湖型两大类。