丰度关系法估算分离结晶岩浆岩系原始岩浆成分

幔源原始岩浆是分离结晶过程的起点，又是地幔的平衡或分离部分熔融的产物，在这种原始岩浆岩中元素丰度关系既遵守分离结晶规律，又遵守地幔部分熔融规律。根据原始岩浆的元素丰度关系的这种双重特性，以安底斯山脉火山岩系的稀土元素为例，阐明了由分离结晶的岩浆岩岩系成分恢复原始岩浆成分的原理，并厘定出原始岩浆元素丰度的估算方法。

Estimation on Primary Magma Compositions of Igneous Rock Series Petrogenetically Associated with Fractional Crystallization by Approach of Element Abundance Relationships

The primary magma is both the starting point of fractional crystallization prooess and the product of equilibrium or fractional partial melting process of mantle. Element abundance relationships in primary magma obey both the law of power function for fractional crystallization and the law of fractional linear function for equilibrium partial melting. Based on the double property of primary magma, the authors advance a principle restoring primary magma composition from that of igneous rock series with petrogenesis of fractional crystallization and put forword an approach estimating the element abundances of the primary magma, taking rare earth clemente of the volcanic rock series of Andes as an example.