峨眉火成岩省地幔热柱热异常初探

The Discussion on Thermal Anomaly of Mantle Plume in Emei Igneous Province

通过对峨眉火成岩省各种镁铁超镁铁质岩石放射性同位素(Th和U)丰度的分析,估算了峨眉火成岩省地幔、地幔热柱头冠和尾柱的热量;论证了峨眉火成岩省地幔内部热异常的存在,并具有明显的热梯度;最后对峨眉地幔热柱的热源特征、地幔热柱的形成和演化进行了初步探讨。

By analyzing the radioactive isotope (Th and U) abundances of the mafic and ultramafic rocks,this paper estimates the quantity of heat of the mantle、corona and tail of the mantle plume in Emei igneous province,and expounds and further proves the existence of thermal anomaly with distinct thermal gradient in the mantle of the Emei igneous province. Finally the paper discusses the characteristics of the thermal origin、the formation and development of the Emei mantle plume.