峨眉火成岩省地幔热柱稀土元素标志

REE Indicator of Mantle Plume in Emei Igneous Province

本文首先讨论了峨眉火成岩省地幔热柱不同部位及地幔基质的REE特征,根据REE丰度结构估算了地幔基质的REE丰度;然后由苦橄岩类和橄榄岩类REE特征和区别,估算了地幔热柱尾柱的REE丰度;最后根据成分接近原生岩浆的玄武岩的REE丰度变化下限,估算了地幔热柱头冠的REE丰度。本文同时讨论了地幔热柱在地幔基质中的可能空间关系,以及确定其空间位置的依据。

The paper first discusses the REE characteristics of different parts of the mantle plume and mantle matrix in the Emei igneous province. Then the REE abundance of the mantle matrix,the tail and corona of the mantle plume, are estimated according to the REE abundance structure,the REE characteristics and differences of the picrite and peridotite,the lower limit of the REE abundance range in the basalts (composition of which is close to that of the primary magma), respectively. And the paper also makes a discussion on the possible spatial relation of the mantle plume and the mantle matrix,and on the evidence to decide the location.