【摘要】 小秦岭加里东期侵入岩的全岩Rb－Sr等时线年龄值为503Ma。岩石类型为（变）辉名正长岩，依据岩石结构特征划分为两个单元，归并为东吉口超单元。其岩浆源于上地慢部分港融岩浆分异的产物，属同造山期侵入岩。依据岩体构造分析，确定为强力（主动）侵位机制。更多还原

【Abstract】 The isochron of whole rock Rb-Sr of intrusive during Caledonian in xiao Qinling mountain is 503 Ma. According to the features of rock texture, the rock type is (metamorphic) pyroxene syenite, the intrusive rock can be divided into two units, and apposited to Dongjikou ultra-unit- Whose original magma is the product which upper-mantle melted partly and differented. The age-forming intrusive rock belongs to synorogenic period By analysis on rockbody structure, it is determined that the mechanism might be strongly emplacement mechanism.更多还原