中国各大陆块在寒武纪全球构造中的位置及意义

Tectonic reconstruction and implications of the landmasses in China during Cambrian time

关键词:  寒武纪  中国大陆  大陆位置  大陆域

Key words:  Cambrian  China continent  continental position  continental domain

摘要:

笔者根据近年来所获的古地磁数据及板块构造的研究成果,对中国各大陆块在寒武纪全球构造中的位置进行了再造。笔者认为寒武纪全球存在三大洋、四大陆域。其中,中国大陆中的扬子、塔里木、柴达木等均属冈瓦纳大陆域,华北陆块则属介于冈瓦纳与劳亚两个大陆域之间的一个中间陆块。且当时华北与扬子两陆块的南、北位置与现在的位置正好相反。而介于二者之间的秦、祁古洋盆在当时是一个位于南半球赤道附近的径向洋。

Abstract:

The tectonic reconstruction of the continental masses in China during Cambrian time has been made on the basis of the palaeomagnetic data available and plate tectonic information. The author contends that during this period there existed three oceans and four continents on the Earth. The Yangtze, Tarim and Qaidam landmasses in China are assigned to the Gondwana continental domain. The North China landmass is sandwiched between Gondwana and Laurasia continents. The positions of the North China and Yangtze landmasses respectively in the northern and southern parts at that time turned out opposite to each other at present. The Qinling-Qilian ancient oceanic basin was then a longitudinal ocean near the equator in the southern hemisphere.