岩石中稀土元素的分布模式特征,不仅对于区别岩石类型有一定的意义,而且也能用它来探讨岩石成因的问题。这是因为一方面稀土元素在岩石中广泛分布,而另一方面它又比较稳定,在岩石发生变质作用的时候,稀土元素能够保持原来的分布模式和含量,直到岩石达到岩浆的或近于岩浆的条件之前。 例如,T.H.格林等(Green et al.,1969,1972)发现,挪威罗弗敦-韦斯特罗伦的片麻岩,从角闪岩相到变粒岩相的不同变质程度岩 The distribution pattern of rare earth elements in rocks not only has some significance for distinguishing rock types, but also can be used to explore the causes of rock formation. This is because, on the one hand, rare earth elements are widely distributed in the rock and on the other hand, they are relatively stable. When the rock is metamorphosed, the rare earth element can maintain the original distribution pattern and content until the rock reaches the magma or near magma Before the conditions. For example, T.H. Greene et al. (Green et al., 1969, 1972) found that the gneiss in Lofoten-Westerlung, Norway, shows varying degrees of metamorphic rocks from amphibolite to metamorphic facies