在江南古陆东段,广泛发育晚元古代的玄武岩,据岩相学和地球化学特征可区分为明显不同的两类:低钛玄武岩和高钛玄武岩.它们由上地幔的不同程度部分熔融产生的岩浆结晶形成. Late Paleoproterozoic basalts were extensively developed in the eastern part of the southern part of southern Jiangnan. According to lithofacies and geochemical characteristics, two types of basalts were distinguished: low-Ti basalts and high-Ti basalts, which were partially melted by different degrees of the upper mantle Of the magma crystal formation.