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对玄武岩熔融实验的研究表明，部分熔融程度大于20％的岩浆中，其强不相容元素之间的比值可以很好地指示源区岩石的元素比值。因此研究拉斑玄武岩源区岩石中的微量元素特征可以采用元素比值的方法。
The study of basalt melting experiment shows that the ratio of strong incompatible elements in the magma whose partial melting degree is more than 20% can well indicate the element ratio of rocks in the source area. Therefore, it is feasible to study the trace element characteristics of rock in basalt source area by elemental ratio.