利用电子探针和激光探针剥蚀系统 (LA ICP MS) ,对北羌塘新第三纪粗面玄武岩中的橄榄石主元素和微量、稀土元素进行了系统分析。结果表明 ,本区橄榄石Fo平均为 88,属贵橄榄石种属。相对富集Ni、Co和重稀土 ,而强烈亏损轻稀土及Rb、Sr、Ba、Zr等大离子亲石元素。其稀土元素配分型式与粗面玄武岩全岩稀土配分型式呈互补状态。 The main olivine elements, trace elements and rare earth elements in the Neogene Quaternary in the northern Qiangtang were systematically analyzed by electron probe and laser probe ablation system (LA ICP MS). The results show that the average olivine Fo in this area is 88, which belongs to the olivine genus. Relative enrichment of Ni, Co and heavy rare earth, and a strong loss of light rare earth and Rb, Sr, Ba, Zr and other large ion lithophile elements. The rare earth elements with the type of coarse basalt with the whole rock rare earth compounding patterns were complementary state.