位于松潘甘孜褶皱带东部三角区内的羊拱海岩体主要是由中心相酸性的二长花岗岩向边缘相中酸性的花岗闪长岩的过渡。通过对该花岗岩体的常量元素、微量元素及稀土元素地球化学特征的研究可知,羊拱海花岗岩属于高钾钙碱性、弱过铝—过铝质岩石系列,Rb、Th、K等富集,Ti、Ba、Nb、Sr、P明显亏损,表现为较平坦的具有较弱Eu亏损的稀土配分模式;岩体具有I型与S型花岗岩过度类型的特点,是在印支晚期区域上大规模的陆—陆碰撞造山环境中形成的。 The Yanggong porphyry located in the eastern Triangular Zone of the Songpan-Ganzi fold belt is mainly composed of the facies-acidic monzonitic granites that migrate to the acidic granodiorite in the marginal facies. Through the study of the geochemical characteristics of the trace elements and trace elements of the granite, we can see that the Yanggonghai granite belongs to the series of high-K calc-alkaline and weakly peraluminous-peraluminous rocks, with enrichment of Rb, Th and K , And obvious depletion of Ti, Ba, Nb, Sr and P, showing a relatively flat REE pattern with weaker Eu depletion. The rock mass is characterized by the over-type of I-type and S-type granites, Scale land-continent collision formed in the orogenic environment.