冰岛的火山活动分别产生于断裂带与非断裂带.其中断裂带火山活动的生成物是典型合低亲石元素的原生拉斑玄武岩(近似MORB),以及由此分化出的玄武岩或中间成分的岩石,甚至有包括极富硅质的流纹岩在内的广义的拉斑玄武岩系列的岩石组成的.与此对比,产于非断裂带的则是一些中间性和稍富碱性的钙碱性成分之物,可以说是典型的FETI—玄武岩.从冰岛断裂带所产的玄武岩看,有50%属于原延的中央海岭玄武岩型,随着沿断裂带向冰岛内陆 Volcanic activity in Iceland occurs in both the fault zone and the non-fault zone, of which the formation of volcanic activity of the fault zone is a typical low-lithophile elemental native tholeiite (approximate MORB), and the basaltic or intermediate component Rocks, and even rocks of the generalized tholei basalt series, which include siliceous rhyolites.In contrast to non-fault zones, some intermediate and slightly alkaline alkaline It is a typical FETI-basalt, which is 50% of the original Central Ridge basalts from the basalts of the Icelandic fault zone,