Laurasia continent

The numerical range of the Pb isotopic composition and the spatial distribution of the two types of samples can be correlated with those of Gondwana and Laurasia continents.

根据铅同位素组成，西南三江地区前中生代的碳酸盐岩可分成具高放射性和低放射性成因铅同位素特征的两种类型，其数值范围和样品的空间分布都可分别与已知的冈瓦纳和劳亚古陆群的铅同位素组成对比。