地球的陆壳是怎样形成的?——神秘而有趣的前寒武纪地质学

How to Originate and Evolve for Continental Crust of the Earth——Precambrian Geology:a Mysterious and Interesting Science

地球的年龄大约有46亿年。以5.45亿年为界,之前的称为前寒武纪,它有大约40亿年,是地球历史上漫长的地质时代。之后的称为显生宙,寒武纪就是显生宙的第一个纪元。地球陆壳的80%～90%以上是在前寒武纪形成的,记录了复杂和惊心动魄的地质构造事件,赋存着丰富的矿产资源。前寒武纪地质,就是研究地球在前寒武纪时期的地质演化,特别是大陆的形成和增生以及演化的学科。

The Earth is ca. 4 600 Ma old up to now. 545 Ma is a key boundary mark. The epoch greater than 545 Ma is called Precambrian Era, time range of which is about 4 000 Ma long. The epoch of 545 Ma is termed Phanerozoic Era. Cambrian is the first geological period of Phanerozoic Era. The 80% - 90 % volume of continental crust was formed in Precambrian. Old-age continent crust records complicated and supernatural geotectonic history, and contains abundant mineral resources with enormous reserves. Precambrian geology is a branch of Earth sciences that study geological process and ending in precambrian, including early continent forming and evolving.