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中文摘要：
本文对峨眉山地幔柱的轴部位置进行了探讨，认为其应在米易一永仁一带。利用经典地幔柱模型，估算出峨眉山地幔柱到达上地幔时轴部直径大约为65—105km，高温苦橄岩的分布和差异剥蚀程度显示中心区的范围约为260～300km。深大断裂带、古地貌等因素控制了溢流玄武岩的喷发和展布，使得轴部岩浆的喷发偏于西部，形成了大理一丽江一带的苦橄岩分布较多的现象。
英文摘要：
This paper discusses the tail of Emeishan mantle plume and suggests that it locates in Miyi-- Yongren area, southern Sichuan--northern Yunnan. On the basis of the classic mantle plume theory, the estimated diameter of Emeishan plume tail was 65 - 105km when it reached the upper mantle. Picrite distributions and sedimentary responses showed that the center zone of the Emeishan plume was ca. 260 ~ 300km wide. Eruption and outcropping of flood basalts were constrained by deep-seated faults and paleogeomorphology, which resulted in the concentration of picrite in the west of the Emeishan large igneous province.
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