The basalts came from high basic magmas of mantle derivation and were formed by low degree of differentiation under a general extension setting in a rift.

• 该玄武岩为陆内拉张环境下基性程度高、分异程度低的幔源岩浆分异的产物，形成于大陆板内裂谷环境，并与拉裂作用有关。